Before you start

A rodné číslo or assigned tax identification number
Registration with the tax office if self-employed; employees are registered through payroll
A Slovak bank account for contributions and refunds
For cross-border work: an A1 portable document from Sociálna poisťovňa or its Austrian counterpart

Step-by-step

1
Employees: let payroll do it, then check the bands
Tax and both insurances are withheld at source, and with a single employer and no other income you sign an annual reconciliation rather than filing a return. Check which of the four bands your gross actually reaches — for most Bratislava salaries the answer is still only 19%.
Via employerWho: Your employer
2
Self-employed: register with three institutions, not one
The tax office, a health insurer and Sociálna poisťovňa are separate registrations with separate obligations. Registering with one does not tell the others.
OnlineWho: You
3
Self-employed: decide between flat-rate and real expenses
Paušálne výdavky let you deduct 60% of income, capped at €20,000 a year, plus the contributions you actually paid, with no bookkeeping of receipts. You choose annually and cannot mix the two within a year; it is unavailable if you are VAT-registered for the whole year.
OnlineWho: You
4
If you work in Austria, split the workdays
Austria taxes the income attributable to days physically worked in Austria. Slovakia taxes you as a resident on worldwide income and relieves the Austrian part under the treaty. The count of workdays on each side of the border is the whole calculation, so keep a record from day one.
OnlineWho: You
5
If you work in Austria, sort out social security separately
Under Regulation 883/2004 you are insured in one state only. Work 25% or more of your time in Slovakia — including from your own flat — and Slovakia becomes competent for contributions. Sociálna poisťovňa issues the A1 that proves which state that is.
In personWho: You
6
File by the deadline
Annual returns are due by 31 March, extendable on notification. The self-employed file every year; employees generally do not unless they have other income.
OnlineWho: YouAnnually

Documents you’ll need

Rodné číslo or tax identification number
Employment contract or trade licence
Annual employer statement, or invoices and expense records
A1 portable document, if you work in more than one member state
Austrian Lohnzettel, if you are employed there

Things most newcomers don’t know

The 2026 thresholds are arithmetic, not policy numbers — and that tells you next year's.

€43,983.32 is exactly 154.8 times the subsistence minimum of €284.13, €60,349.21 is 212.4 times it and €75,010.32 is 264 times it. The subsistence minimum rose to €295.22 in July 2026, so every one of those figures will rise by about 3.9% for 2027. Anyone quoting a euro threshold without the multiple is quoting a number with a shelf life.

Source: Slovak consolidation package; Financial Administration

The uncapped health contribution is the real 2026 change, not the 35% band.

The extra rate bands only bite above €60,000 of tax base. The health rise from 4% to 5% applies to every euro you earn with no ceiling, so it hits everyone, and it stacks on top of the new bands for high earners. A €7,000-a-month employee lost around €123 a month net; a €3,000 one lost about €23.

Source: Accace / KPMG analyses of the consolidation package

Slovak freelancers get a 60% flat expense deduction that most newcomers never claim.

Paušálne výdavky deduct 60% of gross income up to €20,000 a year with no receipts, and paid contributions are added on top of the cap. For a consultant billing €40,000 it removes bookkeeping entirely and lands close to the real expense position anyway. It is elected annually on the return.

Source: §6(10), Act 595/2003 on Income Tax

The financial transaction tax stopped applying to sole traders on 1 January 2026.

Slovakia's 2025 transaction tax on outgoing business payments was widely written up as a reason not to freelance here. From 1 January 2026 only legal entities are taxpayers, so a person on a živnosť is out of scope — but an s.r.o. is still in it. Almost everything published in 2025 has this backwards now.

Source: 2026 amendment to the Financial Transaction Tax Act

Austria's treaty with Slovakia has no cross-border-commuter clause, and that is deliberate.

Austria's treaties with Germany, Italy and Liechtenstein define a Grenzgänger who is taxed at home. Its treaties with Slovakia, Czechia, Hungary and Slovenia do not. So a Bratislava resident employed in Vienna is taxed in Austria on Austrian workdays and relieved in Slovakia — the opposite of what commuters from a Grenzgänger country expect.

Source: oesterreich.gv.at — income tax rules for cross-border commuters

Twenty-five per cent of your working time is the number that moves your social security.

Under Article 13 of Regulation 883/2004, a substantial part of your activity means at least 25% of working time or pay. Take one day a week at home in Petržalka on an Austrian contract and you have crossed it, moving your contributions to Slovakia and your employer into Slovak payroll — unless an A1 derogation is in place first.

Source: Sociálna poisťovňa / Ministry of Labour — determining applicable legislation

Common mistakes to avoid

Using a pre-2026 Slovak salary calculator — it will miss the 30% and 35% bands and the 4%→5% health rise.
Assuming health contributions are capped like social ones. They are not.
Reading a 2025 article about the financial transaction tax and concluding a Slovak trade licence is taxed on every payment.
Registering with the tax office and assuming the health insurer and Sociálna poisťovňa were told.
Home-working across the border without an A1 and discovering afterwards that Slovakia, not Austria, was the competent state all along.
Not keeping a day-by-day record of which side of the border you worked on.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.