Whether you are purchasing, selling, or simply holding real estate in Hungary, a range of distinct taxes will apply at each stage. Purchasers of second-hand properties are subject to a 4% property transfer tax, while newly built homes attract VAT at the standard rate of 27% — though qualifying new-build residential units may benefit from a reduced 5% rate. Vendors can face a 15% capital gains tax on profits, which tapers to zero once a property has been held for five years. Recurring annual property taxes exist in certain localities but are far from universal. Always confirm the figures currently in force with Hungary’s National Tax and Customs Administration (NAV).
| Item | Details |
|---|---|
| Property transfer tax (buyer, resale) | 4% of market value up to HUF 1 billion; 2% above HUF 1 billion; capped at HUF 200 million per property (as of 2025) |
| VAT on new-build residential property | 27% standard rate; 5% reduced rate for qualifying new residential properties meeting size criteria (as of 2025) |
| Capital gains tax (seller) | 15% flat rate on taxable gain; reduces to 0% after 5 years of ownership (as of 2025) |
| Inheritance / gift tax (residential property) | 9% preferential rate for residential property; 18% for other property; lineal relatives fully exempt (as of 2025) |
| Rental income tax | 15% flat personal income tax; 13% social tax may also apply (as of 2025) |
| Annual building / land tax | Set locally; not levied in most areas; max HUF 1,100/m² or 3.6% adjusted market value for buildings (as of 2025) |
What taxes and fees apply when buying a property in Hungary?
For anyone acquiring a second-hand property in Hungary, the principal upfront cost is the property transfer tax. This levy is charged at 4% of the property’s market value, with a lower rate of 2% applicable to any portion of the value exceeding HUF 1 billion. The total tax liability is capped at HUF 200 million per property. As of 2025, HUF 1 billion equates to roughly €2.5 million, so the tiered rate structure is primarily relevant for higher-value acquisitions. Always verify the prevailing HUF/EUR exchange rate and confirm current thresholds directly with Hungary’s National Tax and Customs Administration (NAV).
As a general rule, the tax base is the market value of the property and no deductions from that figure are permitted. The tax authority will ordinarily accept the price recorded in the transfer agreement as reflecting market value, provided it is not conspicuously below what would be expected. In contrast to the UK’s stamp duty land tax system — which distinguishes between first-time buyers, second-home purchasers, and investors across multiple price bands — Hungary’s transfer tax uses a simpler percentage approach that does not differentiate between buyer categories at the point of transfer.
Where a newly constructed property is concerned, VAT rather than transfer tax is the applicable charge. The standard VAT rate on new buildings in Hungary is 27%, which is usually embedded within the sale price. A reduced rate of 5% is available for newly built residential apartments and houses with usable floor areas not exceeding 150 sqm and 300 sqm respectively, or for certain properties constructed within designated brownfield regeneration zones. Following the expiry of a temporary reduced-rate extension at the end of 2024, new residential properties that fall outside these size parameters should be expected to carry the full 27% VAT rate. Prospective buyers should always confirm the VAT treatment of a specific new-build with their legal adviser before exchanging contracts.
In addition to transfer tax or VAT, buyers will typically encounter a number of supplementary costs. Legal fees commonly fall in the range of 1% to 2% of the purchase price. Engaging a qualified Hungarian lawyer is mandatory — real estate transactions cannot lawfully proceed without one. Registering the change of ownership in the land registry attracts a fee of approximately €100–€200. These are indicative figures and should be verified with your legal adviser as of 2025.
A fee is also payable to the land registry office, and notarial costs may arise depending on the nature of the transaction. Such additional expenses are generally borne by the buyer unless the parties agree otherwise. Any costs associated with clearing existing encumbrances on the property — such as lifting a mortgage charge — fall to the seller. Buyers should plan for total acquisition costs of up to around 10% of the purchase price beyond the agreed consideration.
The transfer tax rate does not differ based on whether the buyer is resident in Hungary or abroad — the same 4% rate is applied universally. Following completion of the transaction, the tax authority has 60 days to determine the amount due and will send an assessment to the buyer by post. Where the buyer holds no registered Hungarian address, the notification is dispatched to their foreign address. Payment must be made within 15 days of receiving that notice.
Worked example (resale property): A buyer acquires a Budapest apartment for HUF 80 million (approximately €200,000 at indicative 2025 rates). Transfer tax = 4% × HUF 80 million = HUF 3.2 million (approx. €8,000). Legal fees at 1.5% = HUF 1.2 million (approx. €3,000). Land registry fee ≈ €150. Total costs on top of the purchase price: approximately HUF 4.5 million (≈€11,150). Verify current thresholds and exchange rates with NAV and your legal adviser.
What taxes and fees apply when selling a property in Hungary?
Vendors of Hungarian property are liable to capital gains tax on any profit realised from the sale. The rate is 15% of the chargeable income, with the taxable amount determined by reference to acquisition and maintenance expenditure and the duration of ownership. The mechanics of the capital gains calculation are set out in the following section.
Sellers generally face a more limited set of transaction costs than buyers. Real estate agency commissions in Hungary are ordinarily negotiated and tend to fall between 2% and 5% of the sale price, though this varies according to the agency, property type, and local market conditions — it is advisable to compare current rates with agents active in your area. Legal fees on the vendor’s side are usually lower than those incurred by the buyer, since the buyer’s lawyer typically prepares the bulk of the transaction documentation. However, sellers may still face legal costs for reviewing contracts or attending to mortgage redemptions.
Costs associated with the discharge of any existing encumbrances — such as redemption fees for a mortgage or the removal of a registered charge from the land register — are the seller’s responsibility. There is no distinct “sales tax” imposed on the vendor in addition to capital gains tax. Municipal levies specifically targeting sellers are not standard practice across Hungary, though it is always prudent to check local regulations for the relevant property’s location.
Hungarian tax residents must report any capital gain in their annual personal income tax return (SZJA return), which is due by 20 May in the year following the sale. Non-residents selling Hungarian property are equally subject to Hungarian tax on that Hungary-source income. The time-based reduction schedule for capital gains tax — described in the next section — means that careful attention to the timing of a sale can result in a substantially lower tax bill.
How does capital gains tax work on property in Hungary?
Gains made by individuals on the disposal of real estate are treated as personal income and taxed separately from the individual’s consolidated income, at a flat rate of 15%. The taxable base is the difference between the sale proceeds and the allowable, documented costs of acquisition, together with certain qualifying expenditure on improvement works.
Rather than applying an inflation-linked adjustment, Hungary uses a time-based tapering mechanism that progressively reduces the proportion of the gain subject to tax the longer the property has been held. Once a property has been owned for five years from the date of acquisition, no personal income tax liability arises at all on any gain. This is a notably generous provision by European standards, where capital gains tax commonly applies without a fixed expiry period. The proportion of the gain that remains taxable in each year of ownership is as follows:
- Year 1 (sold in the same calendar year as purchase): 100% of the gain is taxable
- Year 2: 90% of the gain is taxable
- Year 3: 60% of the gain is taxable
- Year 4: 30% of the gain is taxable
- Year 5 and beyond: 0% — no tax liability arises
Non-resident individuals disposing of Hungarian real estate are taxed on their net capital gain at the same 15% flat rate. Allowable deductions cover acquisition costs and associated expenses, improvement expenditure, and costs directly linked to the transfer. The treatment of residents and non-residents is therefore broadly aligned for individual sellers, though non-residents should also examine any applicable double taxation agreement.
The favourable provisions — including the full exemption after five years — apply only in respect of real estate held for personal use. Where the tax authority determines that a private individual is engaged in a pattern of property acquisitions and disposals that constitutes a trading activity, the more burdensome rules applicable to business income will instead apply. Individuals who regularly buy and sell property should seek specific advice on whether their activities might be characterised in this way.
Capital gains are chargeable at 15%. If specified conditions are not satisfied, a further 13% social contribution tax (szociális hozzájárulási adó) may also be payable. This social tax obligation ceases once the individual’s aggregate annual income from relevant sources reaches a threshold of 24 times the national minimum wage for the year in question. Since the minimum wage is updated annually, it is important to verify the current applicable amount with NAV.
Worked example: A property is purchased in 2021 for HUF 40 million and sold in 2024 (the fourth year of ownership) for HUF 58 million. The seller incurred HUF 2 million in legal and notarial costs and HUF 1 million in qualifying renovation expenditure. Gross gain = HUF 15 million. Less deductible costs = HUF 3 million. Net gain = HUF 12 million. In year four, only 30% is chargeable: HUF 3.6 million. Capital gains tax at 15% = HUF 540,000 (approx. €1,350 at indicative 2025 rates). Had the vendor waited until year five, the liability would have been nil. Always confirm the applicable reduction percentages at the time of sale with NAV.
Are there any ongoing annual property taxes in Hungary?
The majority of Hungarian property owners are not subject to any annual property tax. An exception exists in localities such as the Lake Hévíz and Lake Balaton resort areas, where local municipalities have chosen to exercise their discretion to levy an annual charge. This distinguishes Hungary markedly from countries such as the United Kingdom — where council tax applies near-universally — or the United States, where annual property tax is a standard feature of ownership regardless of location.
Hungarian municipalities are empowered to impose building tax and land tax at their own discretion, up to nationally prescribed ceilings. Whether any given municipality actually makes use of this power, and at what rate, is decided at the local level. The local authority may or may not choose to levy such taxes, and rates differ from one municipality to another — this can be a meaningful factor when evaluating a prospective purchase location.
Where building tax is levied, the nationally capped maximum rate is HUF 1,100 per square metre, or alternatively 3.6% of the adjusted market value of the building — whichever the municipality selects (as of 2025). Land (plot) tax, where imposed, carries a national cap of HUF 200 per square metre or 3% of the adjusted market value of the land parcel. Individual municipalities may set rates below these ceilings or opt not to levy the tax at all.
The liable taxpayer for building tax purposes is the person recorded as the property owner on 1 January of the relevant tax year. Local authorities are responsible for determining the rate and issuing assessments. Property owners in municipalities that do levy these charges will generally receive an annual demand from the local council. Before committing to a purchase, it is prudent to contact the relevant local government office (önkormányzat) to establish whether and at what rate these taxes apply in that specific location, as both the decision to levy and the rates employed vary considerably around the country.
Hungary does not impose any national wealth tax on property holdings. Owning a high-value home or a portfolio of investment properties does not in itself trigger any additional levy at the national level over and above the local building and land taxes described above.
How does inheritance tax apply to property in Hungary?
The standard inheritance and gift tax rate under Hungarian law is 18%, with a preferential rate of 9% applying to residential property. Transfers of property between lineal relatives — which includes the surviving spouse of the deceased — take place free of inheritance duty. This exemption delivers a significant financial benefit to many families and represents one of the more generous features of Hungary’s property taxation framework.
Under Hungarian law, the category of “lineal relatives” encompasses direct ascendants and descendants — including parents, grandparents, children, and grandchildren — as well as the spouse of the deceased. Siblings, including blood siblings, half-siblings, and adoptive siblings sharing at least one parent, are similarly exempt from inheritance duty. This broader exemption compares favourably with the position in many other EU member states. Where the heir is a stepchild, foster child, stepparent, or foster parent of the deceased, an exemption applies to the first HUF 20 million of the net value of the inherited share.
For those who fall outside the exempt categories — such as more distant relatives or unconnected individuals — the standard rate of 18% applies, reduced to a preferential 9% where the inherited asset is residential property. The applicable rate is determined by the nature of the relationship between the deceased and the beneficiary and by the type of asset being inherited. Foreign nationals who inherit Hungarian real estate may equally be subject to these duties.
Hungarian inheritance tax rules apply exclusively to property situated within Hungary and do not extend to foreign-located assets. Non-resident heirs who stand to inherit Hungarian property should seek guidance from a Hungarian notary or qualified tax adviser, as the administration of an estate requires a Hungarian notarial process and any duties arising must be settled with NAV. Always verify the rates and thresholds currently in force with NAV or the notary administering the estate.
From 2026, inheritance tax will no longer apply to the inheritance of a protected or heritage-listed residential building together with the dwelling it contains — a measure intended to encourage the preservation of architecturally significant properties. Confirm this change and any further legislative developments with NAV or a qualified Hungarian tax adviser.
How does gift tax apply to property transfers in Hungary?
Hungary levies a gift tax (ajándékozási illeték) on property transferred without any payment of consideration. The standard rate is 18%, with a reduced rate of 9% applicable to residential property. Transfers between lineal relatives attract no gift tax. The rules governing gift tax closely parallel those for inheritance tax, producing a consistent treatment of gratuitous property transfers within families.
Gift tax is charged on individuals who receive movable or immovable property, or valuable rights, by way of gift. The applicable rate reflects the nature of the relationship between donor and recipient and can range from 0% to 18%. The 0% effective rate applies to exempt recipients — that is, lineal relatives and spouses — while the 9% preferential rate for residential property and the 18% general rate apply to non-exempt beneficiaries. Verify these figures with NAV as of 2025, as legislative amendments can alter the rates in force.
Hungary does not operate a lifetime gift allowance in the same fashion as certain other jurisdictions — for example, the annual gift exemption available in the United Kingdom or Ireland. The exemption system in Hungary is founded on the relationship between the parties rather than the monetary value of the transfer for most categories of recipient. Spouses transferring property between themselves are exempt from gift tax, including on the gratuitous transfer of assets or upon the dissolution of marital community property arrangements.
Where a gift of Hungarian real estate involves parties who are not resident in Hungary, Hungarian gift tax rules still apply to that property irrespective of where the donor or recipient is based. Non-residents who receive Hungarian property as a gift are required to register the transaction with the Hungarian tax authority and may need to submit a gift tax declaration through a Hungarian notary or lawyer. Any applicable double taxation treaty may affect the overall tax outcome, and a specialist Hungarian tax adviser should be consulted wherever cross-border elements are involved.
How is rental income from property taxed in Hungary?
Rental income earned by individuals from letting out property in Hungary is subject to personal income tax at a flat rate of 15%. Various allowable deductions and reliefs may reduce the amount of income on which tax is actually charged. Hungary’s uniform 15% personal income tax rate applies to rental receipts in the same manner as most other types of individual income, making the system comparatively straightforward when set against the multi-band structures used in other countries.
Rental income is classified as income from independent activity under Hungarian tax law. Deductible costs can typically include maintenance and repair expenditure directly related to the rental property, statutory depreciation, property management or letting agency fees, and other documented outgoings incurred in earning the rental income. The deductibility of mortgage interest is a nuanced point of Hungarian tax law and should be verified directly with NAV, as the rules on allowable expenses can be detailed and subject to change.
Beyond the 15% personal income tax, a further 13% social contribution tax may be payable where certain conditions are not met. Whether this social tax applies in relation to rental income depends on whether the individual’s total annual income from specified sources has already reached the cap of 24 times the Hungarian minimum wage. This is a point that individual landlords frequently overlook — a Hungarian tax adviser should be consulted to establish the position in your specific case.
For long-term residential letting by private individuals, rental activity is generally exempt from VAT and carries no entitlement to VAT deduction. This represents a meaningful simplification compared to some other systems, where landlords must register for VAT once income crosses a specified threshold.
Short-term holiday lettings — such as those arranged through platforms like Airbnb — are treated quite differently. Such activity carries a VAT rate of 5% and is also subject to a 4% tourism development contribution. However, the regulatory environment for short-term rentals in Hungary has changed substantially. With effect from 1 January 2025, Hungary imposed a two-year moratorium on all new short-term rental registrations, meaning no new operations of this kind may be registered until 31 December 2026. Additionally, from 1 January 2026, the Budapest district of Terézváros (Theresa City) has voted to prohibit short-term rentals entirely in response to concerns about over-tourism, and there are indications that comparable restrictions may be considered in other parts of the city.
Short-term rental operations that were already established before the moratorium must continue to satisfy all applicable legal, registration, and reporting requirements. These include holding a tax identification number, formally registering the property, and reporting all activity to the National Tourism Data Centre and the relevant district notary. Foreign property owners must obtain a Hungarian tax identification number in order to meet their tax obligations. The Hungarian tax identification number (adóazonosító jel) is obtained by completing and submitting Form T34 to NAV.
Worked example (long-term rental): A landlord collects HUF 3,000,000 in rental income over a full year from a residential apartment. Allowable deductions — covering maintenance costs, agency fees, and depreciation — amount to HUF 600,000. Net taxable rental income = HUF 2,400,000. Personal income tax at 15% = HUF 360,000 (approx. €900 at indicative 2025 rates). Whether additional social tax is also due depends on the landlord’s overall annual income from relevant sources — seek up-to-date guidance from NAV or a qualified tax adviser.
An individual who spends fewer than 183 days in Hungary during a tax year is treated as a non-resident for Hungarian tax purposes. Non-residents are liable to Hungarian tax only on income arising from Hungarian sources, such as rental receipts from Hungarian property. This means non-resident landlords letting out Hungarian real estate remain subject to Hungarian personal income tax at the same 15% rate that applies to residents.
Are there any tax advantages or incentives for buying property in Hungary?
Hungary has introduced a number of property-related incentives and reliefs, aimed principally at supporting families and those entering the housing market. The most prominent of these is the CSOK (Családi Otthonteremtési Kedvezmény) scheme. When first launched in 2015, the Family Home Purchase Subsidy Programme and its rural variant provided financial support that helped make borrowing more affordable and stimulated housing demand. The programme has been expanded and restructured several times since then — from 2024, a new enhanced version called CSOK Plus has been operating, offering preferential loan terms to families buying or constructing a home.
Purchasers who acquire an ownership interest in a property using the CSOK or CSOK Plus subsidy may qualify for a full exemption from property transfer tax. The financial impact of this relief is substantial: on a property priced at HUF 50 million, a 4% transfer tax would ordinarily amount to HUF 2 million — the exemption eliminates this cost entirely. Because eligibility criteria, qualifying property values, and subsidy amounts are subject to periodic revision, prospective buyers should check the current conditions with NAV or their legal adviser before assuming that the exemption will apply to their transaction.
The five-year capital gains tax tapering schedule described earlier in this guide functions as an inherent incentive encouraging medium-term property ownership. Vendors who have held their property for five years incur no capital gains tax whatsoever, substantially improving after-tax returns relative to holding periods of two or three years.
From 2026, the inheritance of a heritage or protected residential building, along with any dwelling it contains, will be exempt from inheritance tax — a measure designed to make it more financially attractive to hold and transmit architecturally significant properties through families without triggering a tax charge.
Hungary’s residence permit programme enables foreign nationals to obtain residency by purchasing residential property worth at least €500,000. Holding a Hungarian residence permit enables visa-free travel within European Union member states. This route may also carry indirect tax advantages — for instance, establishing Hungarian tax residency gives access to Hungary’s flat 15% personal income tax rate and the country’s extensive network of double taxation treaties. Independent legal and tax advice is essential before investing for residency purposes, and programme details should always be confirmed directly given that the rules may change.
Hungary’s corporate income tax rate of 9% — among the lowest in the EU — means that holding rental property within a company structure could result in a lower effective tax charge on rental profits compared to the 15% personal income tax rate combined with potential social contribution tax. However, withdrawing profits from a company carries its own tax implications, and professional structuring advice is required to assess whether this approach produces a genuine overall saving.
What are the tax implications for foreign nationals buying property in Hungary?
Hungary does not impose any additional transfer tax surcharge on foreign purchasers — the same 4% rate applies whether the buyer is Hungarian or from abroad. The legal process does, however, differ depending on the buyer’s nationality and the nature of the property. Citizens of EU and EEA member states and Switzerland enjoy the same property purchase rights as Hungarian nationals.
Purchasing property in Hungary as a foreigner has become more complex in recent years. Non-EU nationals must apply for a purchase permit, and the overall legal process can be difficult to navigate without guidance from someone with local expertise. The permit application is made to the relevant local government office (kormányhivatal) and typically extends the time needed to complete the transaction. Buyers from outside the EU and EEA should factor in additional legal fees associated with the permit procedure.
Foreign investors must obtain a Hungarian tax identification number before they can meet their tax obligations in Hungary. The Hungarian Tax Identification Number (TIN) — known as an adóazonosító jel — is obtained by completing Form T34 and submitting it to the National Tax and Customs Administration (NAV). This step should be taken early in the acquisition process, as the number is required both for paying transfer tax and for any subsequent rental income or capital gains reporting.
Hungary operates a residency-based tax system, meaning that tax obligations are determined by an individual’s residency status rather than their nationality. An individual who spends 183 or more days in Hungary within a given calendar year is considered a Hungarian tax resident and is accordingly taxed on their worldwide income — encompassing wages, investment returns, rental receipts, and foreign assets alike. Non-residents, by contrast, are only taxed in Hungary on income derived from Hungarian sources, including property gains and rental income.
Hungary maintains a broad network of double taxation agreements. With over 80 such treaties in place — the majority modelled on the OECD framework — Hungary has extensive arrangements designed to prevent the same income from being taxed twice, typically through exemptions or foreign tax credits. However, Hungary’s double taxation treaty with the United States was terminated with effect from 1 January 2024. US-resident property owners in Hungary consequently face the possibility of dual taxation on the same income without access to treaty relief — specialist advice is strongly recommended for anyone in this situation.
Non-resident private individuals who derive capital gains from the disposal of shares in a “real estate company” — defined as a company whose assets principally comprise Hungarian property — are also subject to Hungarian tax at 15%. Holding property through a company structure therefore does not enable foreign investors to side-step Hungarian tax on property-related gains. Separate from Hungarian tax obligations, any reporting requirements in the investor’s country of residence — such as declaring Hungarian rental income or gains to the home country tax authority — must be addressed independently. A tax adviser experienced in both Hungarian and the investor’s home country law should be engaged before any purchase is finalised.
Frequently asked questions about property taxes in Hungary
Do I pay capital gains tax if I sell my Hungary property as a non-resident?
Net capital gains realised by non-resident individuals on the disposal of Hungarian real estate are taxed at a flat rate of 15%. The time-based tapering rules apply in exactly the same way as for residents — meaning that a gain on property held for five years or more attracts no tax at all. The gain must be declared to Hungary’s NAV. You may also be required to report it in your country of residence, depending on the applicable double taxation treaty. Consult both a Hungarian tax adviser and your home-country tax adviser before proceeding with a sale.
Can I deduct mortgage interest on rental income in Hungary?
Various documented costs connected with the rental property — such as maintenance, repairs, agency fees, and depreciation — are deductible from rental income. The treatment of mortgage interest is a more nuanced area of Hungarian tax law, depending on how the rental activity is classified and how expenditure is substantiated. Verify the current position directly with NAV or a qualified Hungarian tax adviser before completing your tax return.
Is there a wealth tax on property in Hungary?
No national wealth tax exists in Hungary. While local municipalities are empowered to levy building and land taxes within their jurisdiction, these charges are modest and are by no means universal. There is no recurring national-level tax based on the aggregate value or size of a property portfolio.
Are close family members exempt from inheritance tax on Hungarian property?
The standard inheritance and gift tax rate is 18%, with a preferential rate of 9% for residential property. Transfers between lineal relatives — including the surviving spouse of the deceased — are fully exempt from inheritance tax. Siblings are also exempt under Hungarian law. More distant relatives and unconnected individuals pay tax at the relevant rate. Confirm the rules currently in force with the notary handling the estate or with NAV.
What happens to capital gains tax if I reinvest the proceeds in a new property in Hungary?
Hungary does not currently provide a general rollover relief or reinvestment exemption that defers capital gains tax when proceeds from a property sale are applied to the purchase of another property. The principal relief available is the five-year ownership period, after which the gain is fully exempt. A Hungarian tax adviser should be consulted regarding your specific circumstances, and the current NAV guidance should be checked, as the rules may be subject to change.
Can I buy property in Hungary as a non-EU citizen?
Non-EU nationals must obtain a purchase permit before acquiring Hungarian property, and the legal process can be challenging without assistance from someone with local knowledge. The permit application is submitted to the relevant local government office. Citizens of EU and EEA member states and Switzerland have the same purchasing rights as Hungarian nationals and do not need a permit. Anyone from outside the EU and EEA should engage a qualified Hungarian lawyer before making any commitment to purchase.
How and when do I pay property transfer tax in Hungary?
Once a transaction has been completed, the tax authority has 60 days to calculate the transfer tax due and will post an assessment to the buyer. Payment must be made within 15 days of receiving that notice. The tax can be settled in full or, for buyers who can demonstrate that immediate payment in full would cause serious financial hardship, in monthly instalments over up to 12 months following a successful application to NAV.
Is short-term rental of my Hungarian property currently allowed?
From 1 January 2025, Hungary introduced a two-year moratorium on the registration of new short-term rental operations, which means no new short-term letting arrangements can be formally registered until 31 December 2026. Existing operators must continue to comply with all registration and reporting obligations. From 1 January 2026, the Budapest district of Terézváros has voted to prohibit short-term rentals entirely. Before making any letting plans, verify the current regulatory position for your specific district with the local municipality or a legal adviser.