The One-Person Sp. z o.o. ZUS Trap: What a Sole Shareholder Pays in 2026

Why this catches foreign founders

A common online comparison says that a shareholder in a Polish Sp. z o.o. does not pay ZUS merely because they own shares. That statement is broadly true for an ordinary multi-shareholder limited company, but there is a major exception: the sole shareholder of a one-person Sp. z o.o. is treated by ZUS as a person conducting non-agricultural activity.

This means a founder who registers a company with 100% of the shares in their own name can create personal social-security obligations even if they never opened a JDG.

The 2026 social-contribution base

For 2026, ZUS places the sole shareholder of a one-person Sp. z o.o. in the standard group of persons conducting non-agricultural activity. The minimum declared social-contribution base for that group is PLN 5,652 per month.

On that minimum base, ZUS lists 2026 social contributions of PLN 1,926.76 per month when voluntary sickness insurance is included, or PLN 1,788.29 without it. Health insurance is separate.

Health insurance is separate too

For persons conducting non-agricultural activity who do not earn business income taxed under one of the entrepreneur tax methods, the 2026 health-contribution base is the average monthly wage from the fourth quarter of the previous year. For 2026 that produces a monthly health contribution of PLN 830.58.

As a result, the total personal ZUS cost for a sole shareholder can be material and should be included in the company-vs-JDG calculation before incorporation.

Does adding a second shareholder solve it?

A genuine multi-shareholder Sp. z o.o. is treated differently: shareholders do not normally become insured merely because they hold shares. But the structure must be real. Polish guidance refers to Supreme Court case law warning that a second shareholding can be considered illusory where one person effectively retains almost all economic rights and control.

Therefore, adding a symbolic second shareholder only to create the appearance of a multi-shareholder company is not a safe planning assumption. Ownership percentages, corporate rights and the real relationship between shareholders matter.

Foreign founders may be covered by another country’s social-security system

For founders moving within the EU/EEA or Switzerland, social-security coordination rules can change the result. If another country's legislation applies, the founder should have the appropriate evidence, such as an A1 document where relevant. A foreign shareholder should therefore not assume that Polish ZUS always applies - but should also not assume that foreign residence automatically removes Polish obligations.

When the one-person company can still make sense

A sole-shareholder Sp. z o.o. can still be appropriate because it offers limited liability and a corporate structure. The point is simply that it should not be sold internally as a 'ZUS-free company'. For many founders, a true multi-shareholder structure, a JDG with available start-up reliefs, or a different remuneration model may produce a better result.

How Neoplus can help

Before registering the company, Neoplus can compare the expected ZUS and tax consequences of a one-person and multi-shareholder Sp. z o.o. and coordinate the result with the founder's accounting setup.