Employed and running a JDG: do you pay ZUS twice?

Usually not. If your employment contract (umowa o pracę) guarantees at least the minimum wage, 4,806 PLN a month in 2026, you pay social contributions only through the job. Your JDG (jednoosobowa działalność gospodarcza, a sole proprietorship) pays just the health contribution. If the job pays less, you pay social contributions twice, once through each.

A job paying at least the minimum wage: health only

ZUS, the Polish social insurance institution, calls this situation zbieg tytułów: two sources of work that would each make you insured. For a job plus a JDG, the job wins if either:

• your contract guarantees at least the minimum wage, which a full-time contract always does, or
• you work part-time for less, but your pay (as the base for contributions) reaches the minimum wage in that month.

Your pension, disability and accident insurance then come from the job only, and your employer handles them.

The JDG still owes the health contribution (składka zdrowotna), because health is paid separately for each source of income. Your employer takes one from your salary, and the business pays its own. The amount depends on the JDG’s tax form (ryczałt is a flat-rate tax on revenue; its thresholds are yearly).

The 432.54 PLN minimum applies from February 2026 to January 2027; the ryczałt amounts apply from January to December 2026. The health contribution guide explains how each one is worked out.

What counts is the guarantee in the contract, not the pay in a given month. If your contract (or two part-time contracts together) guarantees the minimum wage, a month on sick leave with lower pay does not make the JDG owe social contributions.

Tip: You may still pay pension and disability contributions from the JDG voluntarily, on ZUS ZUA. Accident insurance comes with them; sickness insurance does not. If you are on ulga na start (the first 6 months of a new business, with no social contributions), joining ends the relief.

A job paying less: you pay twice

If the contract does not guarantee the minimum wage and the pay stays below 4,806 PLN, social contributions are compulsory from both the job and the JDG. The business pays at its normal stage:

1. nothing during ulga na start;
2. preferential ZUS (a lower base for the next 24 months);
3. then Mały ZUS Plus (contributions based on your income) or full ZUS.

The ZUS guide walks through these stages.

One narrow exception applies on ryczałt: if your job’s contribution base is no more than the minimum wage and your business revenue is no more than 2,403 PLN a month (half the minimum wage), the JDG’s health contribution is zero. You still register and file, showing 0.

Watch out: The start-up reliefs do not pause while your job covers you. ZUS says the 24 months of preferential contributions keep running while you pay only health. If the job ends 20 months into that period, you have 4 cheaper months left, not 24.

Which ZUS form, and by when

You register within 7 days of starting the business, or of any change. The easiest way is to attach the ZUS form to your application in CEIDG, the public register of sole traders.

If the job ends, or your pay drops below the minimum wage for good, the JDG owes social contributions from that point. Deregister on ZUS ZWUA and register on ZUS ZUA within 7 days. The same applies the other way round when you start a job.

Every month you also file a ZUS DRA (the monthly contribution report) and pay by the 20th, even when the only amount is the health contribution. When the 20th falls on a weekend or public holiday, the deadline moves to the next working day.

Tip: If you had voluntary sickness insurance in your JDG, it ends when a job paying the minimum wage takes over your pension and disability cover. The job’s sickness insurance covers you instead; after the job ends, join again on ZUS ZUA to get it back.

A civil-law contract (umowa zlecenie) and a JDG

An umowa zlecenie (a civil-law mandate contract) has its own rules. What matters is its contribution base and your JDG’s stage.

ZUS’s guide adds a few points:

• In a month with no pay from the zlecenie, the JDG’s contributions are compulsory.
• If the zlecenie is the same kind of work as your business and taxed as business income, it is part of the JDG, not a separate title.
• A student under 26 with a zlecenie is insured only through the JDG.
• A zlecenie signed with your own employer counts as part of your job, so the job-plus-JDG rules above apply to the total pay.

When the zlecenie is a separate title, health is due from both: the client deducts it from the zlecenie’s pay, and the JDG pays its own.

Working B2B for your own employer

Invoicing your own employer, or a former one, from your JDG (“B2B” work) is legal. It usually costs more than it saves.

• No start-up ZUS reliefs. Ulga na start and the preferential 24 months are not available if you do for a current or former employer what you did for them as an employee in the current or previous calendar year. Mały ZUS Plus and the ZUS holiday have similar exclusions.
• Flat tax lost for the year. If you invoice a current or former employer for the same work you did as their employee in the same tax year, you lose the 19% flat tax for the whole year. You recalculate on the tax scale from 1 January, with late-payment interest.
• Ryczałt lost from that day. Ryczałt is stricter: it looks at the current and the previous year. You move to the tax scale from the day of that revenue until the end of the year.
• It may not be a business at all. Tax law does not treat work as a business when all three are true: the client carries the liability to third parties; the client directs your work and sets your place and hours; and you carry no business risk. Since 8 July 2026 a labour inspector can also declare such a contract to be employment, by a decision, when the client ignores an order to put it right. See whether your B2B contract can become a job.

Example: You leave a full-time job in December 2026 and invoice the same company for the same work from January 2027. The flat tax stays available, because the job was in the previous year. Ryczałt does not, because the previous year counts: you would be on the tax scale from your first invoice. Ulga na start and preferential ZUS are not available either.

Sick leave from the job

Paid work during sick leave (L4, the doctor’s sick note) costs you the sickness allowance for the whole sick leave. Since 13 April 2026 the law says this means any paid activity, under any contract, including work in your JDG.

The law makes an exception for “incidental” tasks forced by important circumstances. ZUS has not said how that applies to a one-person business, for example sending a single invoice. If the business must keep running during sick leave, ask ZUS first (22 560 16 00).

From 1 January 2027, someone insured under two titles will be able to ask for sick leave for one title only, when the work under the other can still be done. If your JDG pays only the health contribution, ask ZUS whether this applies to you.

Your annual tax return

Your employer sends you a PIT-11 showing your salary and the tax already taken. How you use it depends on your JDG’s tax form.

On the tax scale, your salary and business income are taxed together. The 30,000 PLN tax-free amount counts only once, and the 32% rate starts when your combined income passes 120,000 PLN. So a good salary often changes which tax form suits the business; choosing a tax form compares them. The flat tax and ryczałt keep the business apart from the salary, but rule out a joint return with your spouse.

Returns for 2026 are filed between 15 February and 30 April 2027 (a Friday). Any tax still owed is paid by the same day.

What to do next

1. Check your contract: does it guarantee at least 4,806 PLN a month in 2026? A full-time contract does.
2. If yes, register the JDG on ZUS ZZA within 7 days, and budget for the health contribution every month.
3. If not, register on ZUS ZUA and pay social contributions at your stage.
4. If your job ends or changes, update ZUS within 7 days.
5. Before invoicing your own employer, work out what you lose in reliefs and tax, and read about B2B contracts.