You can leave. You may not be able to get back in. That is the whole answer, and if you take nothing else from this post, take the shape of it: the document that keeps you lawful in Poland while your case runs is not a document that gets you across a border into Poland.
So the practical verdict for anyone with a case open at the Mazowieckie office in Warsaw: if your visa or visa-free entitlement has run out and you are holding only the certificate that replaced the passport stamp, treat leaving the country as a decision with a real risk of not returning quickly, not as a weekend. If you still hold a valid national visa or a residence card, your position is different and much better. Work out which of those you are before you book anything.
Checked on 2 September 2026. This describes what the published rules and the Border Guard say. It is not permission to travel, and only the Border Guard decides at the border.
What the Border Guard actually says
The Straż Graniczna publishes an FAQ for foreigners on exactly this question, framed around the voivode’s stamp — the red odcisk stempla that was placed in passports until 27 April 2026 and which the downloadable MOS certificate has now replaced.
Its answer has two halves and people remember only the first:
- The stamp allows departure from Polish territory — “stampila umożliwia również wyjazd z terytorium RP”.
- The stamp does not authorise re-entry — “Ww. stampila nie upoważnia natomiast cudzoziemca do ponownego wjazdu na terytorium RP”.
Re-entry, the Border Guard states, happens on a residence card (karta pobytu) or on the basis of a Polish visa — or, for those entitled to it, visa-free movement whose day count has not been exhausted. The certificate is not on that list. Neither was the stamp.
The same limit applies inside Schengen. The document evidences your position in Poland during proceedings; it is not accepted as an entry document by other Schengen states. If your plan involves a border crossing at all — including a train to Berlin — the document you are relying on is your passport and whatever entry entitlement it carries, not your case.
The four positions you can be in
Find yours. The answer is different in each, and this is the step people skip.
You hold a valid national visa (type D) that outlives your trip. The ordinary position and the comfortable one. You leave and return on the visa. Watch its expiry date against your return date rather than against your case, because a visa expiring mid-case is a separate problem and it becomes a border problem the moment you are outside the country.
You hold a valid residence card from a previous permit, and applied to renew before it expired. Also workable, but check the card’s own expiry rather than assuming the pending renewal extends it. A card that expires while you are abroad is the same trap as a visa that does.
You are visa-free and have days left in the 90/180 window. Every short stay counts against the ninety days in any rolling one-hundred-and-eighty, including time spent in Poland on the strength of the certificate. Run the arithmetic honestly before you leave; the calculator is the one the European Commission publishes, and the count is not reset by having a case open.
Your visa or visa-free window has expired and the certificate is what keeps you lawful. This is the position the site is written for, and the answer here is: leaving means you need a fresh entry entitlement to return, which in practice means a visa application from outside, at a consulate, in the middle of a case that assumes you are in Poland. Do not do this for a holiday. If it is a funeral or an emergency, it is a lawyer’s question the same week, not a question for a forum.
Why “but my case is open” does not help at the border
Because the case and the border are administered by different bodies against different rules. Your open application is a matter for the voivode under Article 108 of the Act on Foreigners, which treats your stay as lawful from filing until the decision becomes final. The border is the Border Guard applying entry rules. The first says nothing to the second.
This is not a Polish quirk and it is not discretion you can argue with. It is the same structure that produces the counter-intuitive result everyone eventually meets: a person can be entirely lawfully resident in Poland and simultaneously unable to enter it.
What leaving does to the case itself
Less than people fear, and more than nothing.
The proceedings do not lapse because you travelled. There is no rule that being abroad withdraws your application.
But the office can summon you, and the summons has a deadline. Article 112a’s clock runs — when it runs at all — from the last of your personal appearance, your file being free of formal defects, and your documents being supplied. A summons you cannot answer because you are in another country does not stop the clock; it stops your case. In Warsaw, where a summons can arrive many months after filing, being reachable and able to attend within the period given is worth more than most things you could do to speed the case up.
Fingerprints and the original travel document require you in person. MOS moved the filing online and left that contact in place. If your appointment lands while you are away, you are rescheduling into a queue.
So the risk of travelling is rarely that you lose the case. It is that you miss the one window in fourteen months when the office wanted something from you.
What to do before you book
An honest sequence, in the order that matters.
- Establish what entry entitlement you actually hold, by expiry date, in writing. Not what you think you hold. Open the passport.
- Check whether the office has issued your certificate and whether the file is recorded as free of formal defects. If it has not, you are also in the window where a summons is most likely.
- Check your MOS account and your registered correspondence address for anything pending. A summons already sent is a decision made for you.
- Buy refundable tickets if there is any doubt at all about your re-entry document. The price difference is small against a consulate appointment abroad.
- If the answer to step 1 is “nothing but the certificate”, ask the office or a lawyer before you go — not a forum, not an agency selling relocation services, and not this post.
The part nobody writes down
The reason this question hurts is that the wait is long enough to contain a life. Nine to fourteen months at Mazowieckie means a wedding, a funeral, a parent’s operation, a contract that wants you in another office for a week. The rule does not bend for any of that, and the honest thing to say is that people in this position routinely decide not to go, and that the decision is a real cost of the process rather than a failure of planning.
If you are weighing it: the thing to establish first is not whether you are allowed to leave. It is what, specifically, you would show at the border on the way back.
Where this is uncertain
The Border Guard’s published FAQ is framed around the stamp, because it predates the April 2026 switch to the MOS certificate. I have found no source suggesting the substance changed with the format — the stamp was never an entry document and nothing indicates the certificate is one — but the guidance has not obviously been rewritten around the new document, and if your case turns on it, ask the Border Guard directly rather than relying on a reading of a page about its predecessor. Where this site does not know, it says so.