Your First Year in Business in Poland: The 2026 Tax Calendar

In short:

• ZUS contributions and your income-tax advance (PIT or CIT) are due by the 20th of the following month; VAT (the JPK_V7 file) by the 25th.
• Your annual return is due by 30 April (PIT for sole traders) or the end of the third month after year-end (CIT — 31 March for a calendar year).
• Companies also file financial statements and, new from 2026, JPK_CIT structured accounting books with the annual return.
• Two 2026 changes hit from day one: the VAT-exemption threshold is PLN 240,000, and KSeF e-invoicing is mandatory.
• New sole traders can start with ulga na start and preferential ZUS; a company’s obligations begin the moment it is registered.

Poland’s tax year runs on a steady rhythm of monthly and annual obligations. Nothing about it is unusually complex — but the deadlines are unforgiving, and they begin the moment your business exists, not after your first invoice. For a foreign founder, the hardest part of year one is simply knowing which date falls when. Here is the whole calendar in one place, updated for 2026.

When do the tax deadlines actually start?

They start the day your business is registered — not the day you make your first sale. A sp. z o.o. exists, and its filing obligations begin, the moment it is entered in the KRS; a JDG (sole proprietorship) the moment it appears in CEIDG. Registering for ZUS, choosing your income-tax form, and filing VAT-R (if you need to) all happen at, or right after, that point.

If you have not set the company up yet, start with our guide on registering a company in Poland as a foreigner — the calendar below picks up the day it is live.

What are the monthly tax deadlines in Poland?

Three obligations repeat every month (or quarter). These are the dates to put in your calendar first:

Obligation	Due date	Notes
ZUS social & health contributions	20th of the following month	The 15th if you run a sp. z o.o. (a legal person); filed on the ZUS DRA declaration
Income-tax advance (PIT or CIT)	20th of the following month	Calculated on your running profit; small and new taxpayers may pay quarterly
VAT — JPK_V7 file + payment	25th of the following month	Monthly (JPK_V7M) or quarterly (JPK_V7K); new VAT payers must file monthly for their first 12 months

The income-tax advance is not a separate return each month — you calculate it yourself and pay it; the detail is settled in the annual return. VAT is different: the JPK_V7 file is the return, submitted electronically every period.

What are the annual filing deadlines?

Once a year, everything is reconciled:

• CIT-8 (companies): filed by the end of the third month after the tax year — 31 March for a calendar-year company.
• Annual PIT (sole traders): PIT-36, PIT-36L or PIT-28 by 30 April.
• Financial statements (companies): drawn up within 3 months of the balance-sheet date, approved within 6 months, and filed to the KRS within 15 days of approval.
• JPK_CIT (JPK_KR): from 1 January 2026, CIT payers who already send JPK_VAT must keep their accounting books in a structured electronic form and submit them with the annual return.

What is different about your very first year?

Year one carries a few one-off decisions and reliefs that never come round again:

• Choose your income-tax form early. For a JDG that means the tax scale, the 19% flat tax, or a ryczałt (lump sum); for a company, standard CIT or Estonian CIT. The choice sets how every advance is calculated for the rest of the year — we compare the practical trade-offs in our guide to sp. z o.o. vs. JDG.
• ulga na start and preferential ZUS (JDG only). A new sole trader can use ulga na start — the first 6 months free of social-security contributions (health contribution only) — followed by 24 months of reduced “preferential” ZUS. A sp. z o.o. does not get this, though a sole shareholder is treated as their own ZUS payer.
• Register for VAT before your first taxable sale if you are required to, or choose to — the VAT rules for foreign founders decide which.
• The PLN 240,000 VAT-exemption threshold is prorated for a business that starts mid-year.
• KSeF applies from 2026. Every VAT payer must already be able to receive structured e-invoices; mandatory issuing is phased in through 2026.

What happens if you miss a deadline?

You will owe statutory interest on any tax paid late, and a missed filing can carry a penal-fiscal fine. The safety valve is czynny żal — a voluntary disclosure filed before the tax office acts, which usually removes the penalty as long as you settle what is owed. It is a genuine remedy, not a loophole, but it only works if you catch the miss yourself. That is the real argument for keeping books current rather than reconstructing them at year-end.

How do you stay ahead of the calendar?

The deadlines themselves are simple; the work is keeping clean, current books so the numbers are ready before each date, not scrambled together after it. That is exactly what we take off your desk — you approve, we file.

Ready to set up your first-year calendar?

Meyis is a Turkish-speaking accounting office in Warsaw, Poland — a biuro rachunkowe that handles bookkeeping, tax, payroll and reporting for foreign entrepreneurs, in Turkish, Polish, English and more.

Set up your accounting with us or message us on WhatsApp at +48 692 413 475. We will map your exact deadlines to your business.

Official sources: the tax portal podatki.gov.pl, the entrepreneurs’ portal biznes.gov.pl and ZUS. Always confirm current figures and thresholds, which can change year to year.