Joint tax filing for married couples with a JDG in Poland (2026)

You can file jointly only on the tax scale (PIT-36). Flat tax or business ryczałt by either spouse rules it out; private rental ryczałt does not. Example.

Running a sole proprietorship (JDG) on the tax scale and married? Filing jointly with your spouse can bring real savings — but only if you meet certain conditions. The key catch: you cannot file jointly under the flat rate or under the lump-sum tax (ryczałt).

We explain the rules for joint taxation of married couples with business income, show a calculation example, and point out when joint filing does not pay off.

Who can file jointly with a spouse

Under Art. 6 ust. 2 and ust. 8 of the PIT Act, joint settlement is possible if:

you remained in a marital relationship with shared marital property throughout the tax year (or married during the year and had shared marital property from the wedding day until the end of the year),
you were both subject to unlimited tax obligation in Poland (were Polish tax residents),
neither of you applied the 19% flat tax rate or the Act on lump-sum income tax in the tax year — with the exception of income from private rental,
neither of you was subject to tonnage tax,
you submitted a request for joint taxation in your annual return.

The condition regarding the flat rate and ryczałt is critical for entrepreneurs. If either spouse chose the flat tax or ryczałt for business activity, neither of you can file a joint return.

Which forms

Joint settlement on the tax scale is done on PIT-36 (if either spouse earns income from business activity, private rental, or other sources requiring self-assessment) or PIT-37 (if you both only have employment income settled by a withholding agent).

For an entrepreneur on the tax scale, it is always PIT-36. The joint-taxation request is indicated in box 6 of the PIT-36 return.

Why not on PIT-36L or PIT-28

PIT-36L (flat 19%) — you cannot file jointly with a spouse on this form. This restriction follows directly from Art. 6 ust. 8 of the PIT Act.
PIT-28 (ryczałt) — ryczałt is governed by a separate act (the Act on lump-sum income tax). Joint settlement for spouses is not provided for under that act.

How to calculate the joint tax

The method for calculating tax in a joint settlement is described in Art. 6 ust. 2 of the PIT Act:

You sum the income of both spouses (after deductions from income, made separately by each),
You divide the sum by 2,
From half the sum you calculate the tax according to the scale (12% up to 120 000 zł, 32% above), reduced by the tax-reducing amount of 3 600 zł,
You multiply the calculated tax by 2.

Example

Husband's income: 200 000 zł (sole proprietorship on the tax scale) Wife's income: 20 000 zł (employment)

Individual filing:

Husband's tax: 120 000 × 12% − 3 600 = 10 800 zł, plus (200 000 − 120 000) × 32% = 25 600 zł, total 36 400 zł
Wife's tax: 20 000 × 12% − 3 600 = −1 200 zł, i.e. 0 zł (the tax-reducing amount is not fully used)
Combined: 36 400 zł

Joint filing:

Total income: 200 000 + 20 000 = 220 000 zł
Half: 220 000 / 2 = 110 000 zł
Tax on 110 000 zł: 110 000 × 12% − 3 600 = 9 600 zł
Joint tax: 9 600 × 2 = 19 200 zł

Savings: 36 400 − 19 200 = 17 200 zł. They come from the fact that the entire income fits within the 12% bracket and the wife's tax-reducing amount is used in full.

For comparison: if the husband earned 120 000 zł and the wife 100 000 zł, the tax would be 19 200 zł both jointly and separately (10 800 + 8 400 zł). When both spouses stay within the 12% bracket and both use the tax-reducing amount, joint filing changes nothing.

When joint settlement is not possible

1. One spouse on the flat rate

If you run a sole proprietorship on the tax scale and your wife/husband on the flat rate — you cannot file jointly. The condition in Art. 6 ust. 8 is absolute: applying the flat rate by either of you precludes joint settlement.

2. One spouse on ryczałt

Similarly — ryczałt from business activity excludes joint settlement. If the wife runs a sole proprietorship under ryczałt, the husband cannot file jointly with her, even if he is employed.

Exception: income from private rental taxed under ryczałt (5,5%–8,5%) does not exclude joint settlement. The exclusion applies only to business activity under ryczałt.

3. Separation of property

If at any point in the tax year there was separation of property between you (a prenuptial agreement or a court ruling), you cannot file jointly for that year. Separation of property established only after the year ends does not prevent joint filing for that year. Merely extending or limiting the shared property regime does not rule out joint filing.

4. Non-resident

If one of you is not subject to unlimited tax obligation in Poland (is not a Polish tax resident), joint settlement is possible only in specific situations involving EU/EEA/Swiss citizens, and requires meeting the 75% income-in-Poland condition.

When joint filing pays off

Joint settlement is advantageous when:

One spouse earns significantly less — splitting the income in half shifts the higher income into a lower bracket,
One spouse does not work — effectively, you "transfer" half of your income to them, which allows doubling the tax-reducing amount (2 × 3 600 zł = 7 200 zł instead of 3 600 zł),
One spouse has income below 30 000 zł — without joint filing, part of their tax-reducing amount is lost.

Joint filing gives nothing when both of you have incomes in the same 12% bracket and each uses the full tax-reducing amount (e.g. 120 000 zł and 100 000 zł), or when both of you exceed 120 000 zł. The tax will not go up, but it will not go down either. On the tax scale, joint filing never results in a higher tax than individual filing.

Pitfalls

Choosing the flat rate for the year — you choose your form of taxation for the whole year (usually by 20 February). If you chose the flat rate or business ryczałt for a given year, joint filing for that year is not possible, even if you were still on the tax scale at the start of the year.
Private rental under ryczałt vs. business on the tax scale — private rental taxed under ryczałt does not exclude joint settlement. This is a common misunderstanding.
Marriage during the year — joint filing is possible if you married during the year and had shared marital property from the wedding day until the end of the year.
Late filing — filing the return after 30 April does not forfeit the right to joint settlement (confirmed by podatki.gov.pl).
Child relief in a joint settlement — in a joint return, the child relief applies on standard terms.

FAQ

Can I file jointly if my wife does not work?

Yes. The absence of income from one spouse does not exclude joint settlement. Effectively, the entire entrepreneur's income is split in half, providing a double tax-reducing amount.

Is joint settlement mandatory?

No, it is a right, not an obligation. You can file individually even if you meet the conditions. The choice is made each year.

Can I file jointly under the flat rate?

No. The flat tax (PIT-36L) excludes joint settlement. This applies when either spouse uses the flat rate.

Does private rental under ryczałt block joint settlement?

No. Ryczałt from private rental (outside business activity) does not exclude joint settlement. The exclusion applies only to ryczałt from business activity.

Can I correct my return and switch from joint to individual filing?

Yes. You can file a correction and change your filing method. This right is not time-limited beyond the statute of limitations period.

Sources

Need help with your tax settlement?

Oxyok handles sole proprietorship accounting on the tax scale, flat rate, and ryczałt — from 49 zł + VAT per month. We'll help you check whether joint filing pays off for you.

Write to Paweł or see Oxyok's accounting services.

This material is for informational purposes. Your individual tax situation requires analysis.