The business has outgrown its shell. Turnover is no longer what it was, big contracts have appeared, a partner or investor has come on board - and with them the worry that your own flat is on the line for the debts. It is a familiar point where a JDG (jednoosobowa działalność gospodarcza - sole proprietorship) starts to feel cramped. The good news: changing form does not mean closing one thing and starting another from scratch. There is przekształcenie, where the company carries on and keeps its history. Let us look at when it is genuinely time, how the procedure runs, and what alternative exists when a formal conversion is overkill.
When a JDG starts to feel cramped
Przekształcenie JDG w spółkę z o.o. (converting a sole proprietorship into a limited liability company) is a legal procedure that changes the business form while preserving continuity: contracts, the NIP (tax number) and most rights pass to the spółka (company) under the principle of sukcesja (succession). It is worth changing form when the risk of personal liability, rising turnover or incoming partners outweigh the simplicity of a JDG.
Signs it is time to think about it:
- personal liability scares you - on a JDG you answer for the debts with all your assets;
- partners or investors are appearing - a JDG has nowhere to place them;
- large contracts call for a more solid form;
- the tax load on high JDG income has grown heavy, and a company structure works out cheaper;
- you plan to sell or hand over the business - a share in a sp. z o.o. can realistically be sold, a JDG almost never.
If that sounds like you, the question is no longer whether to change but how to change with the least loss.
Two routes: formal przekształcenie or a new spółka
There are two ways to change form, and they are fundamentally different.
Route 1: przekształcenie under the Code (with succession)
A full conversion under the kodeks spółek handlowych (Commercial Companies Code). The main advantage is sukcesja: the sp. z o.o. becomes the legal successor of the entrepreneur, contracts and permits pass to it, and the NIP and history are often preserved. Clients and counterparties barely notice the change. The downside is that the procedure is more involved and slower.
Route 2: close the JDG and open a new sp. z o.o. (with an aport)
Simpler and faster: you open a new spółka, optionally contribute the business assets as an aport (in-kind contribution), gradually move the activity across, then close the JDG. The downside is no automatic succession: contracts have to be re-signed, the NIP will be new, and licences must be reissued. It fits when there is not much "history" and you do not mind starting it over.
| Criterion | Przekształcenie | New spółka + aport |
|---|---|---|
| Succession of rights | Yes | No |
| NIP | Often preserved | New |
| Contracts | Carry over | Re-sign |
| Complexity | Higher | Lower |
| Speed | Slower | Faster |
| When to choose | Many contracts, licences | Simple business, little history |
How a formal przekształcenie runs
If you go with the succession route, the path looks roughly like this:
- Plan przekształcenia - the conversion plan, prepared by the entrepreneur.
- Badanie biegłego rewidenta - in certain cases the plan is examined by a court-appointed sworn auditor.
- Oświadczenie o przekształceniu and akt notarialny - the statement and the notarial deed, with adoption of the umowa spółki (articles of association).
- Wpis do KRS - registration of the company in the register (Krajowy Rejestr Sądowy); from that moment the entrepreneur "becomes" the company.
- Updates - data with the US (tax office), the bank, the CRBR (covered in our piece on CRBR and the beneficial owner), and refreshed details with counterparties.
This is not a one-day affair - a procedure with an audit and KRS runs for weeks, sometimes a couple of months. On cost there is the notary, a possible audit, plus court and support fees. In return the business stays legally continuous.
What happens with taxes and ZUS
Changing form changes the tax regime too: the entrepreneur's PIT gives way to the company's CIT plus dividend tax at the shareholder level. That is a separate calculation - sometimes the tax advantage of a company structure (at high income, say) is exactly what pushes the conversion, and sometimes the smarter move is to stay on a JDG with a well-chosen tax form. We covered JDG taxation forms in the article on JDG taxes in 2026. These numbers need to be run before a conversion, not changed "just in case".
If you are still choosing your starting form and the growth is not obvious, look at the comparison of JDG or sp. z o.o. - it may be simpler to open the company outright.
Converting a JDG into a sp. z o.o. is not about the fashion for "having your own company" - it is about the moment when a simple form starts costing more than its risks. Which route to take, a formal przekształcenie with succession or a new spółka with an aport, depends on how many contracts and licences you hold and how much continuity matters. We calculate both scenarios, run the procedure and take on the KRS, the notary and the register updates. This is general information, not individual legal advice. To work through your case, contact us for business support.