MOS — The Most Common Mistakes and How to Avoid Them

The MOS portal (Moduł Obsługi Spraw — the government case-handling portal) works: the procedure is described step by step, and you file the whole application online. Problems almost never come from a flawed system. They come from the same mistakes applicants have repeated for years — mistakes UdSC and the voivodeship offices know well. We've gathered the most common ones here. Go through this list before you click "Złóż wniosek" (Submit application).

Download the UPO the moment you submit. It's generated the instant your application is correctly filed — download and save it right away; it's your proof of submission.

B1 — Not Reading the Procedure Information Before Filling the Form

The single biggest source of wasted hours. MOS publishes a separate procedure page for each permit category — it tells you which attachments are mandatory and what the form will ask for. Applicants start filling in the form and, halfway through, discover they're missing a document that takes a week to obtain.

Fix. Read the procedure page for your category start to finish before you start the form.

B2 — Starting Preparations Too Late

The application must be filed at the latest on the last day of your legal stay. A system outage does not extend this deadline — Art. 225e of the Act on Foreigners does not treat a system outage as grounds to move the statutory deadline.

Fix. Start early: the form, the full set of documents, and the employer's signature all take time you won't have on the last day.

B3 — False, Approximate, or Inconsistent Personal Data

The form requires exact dates, the exact spelling of your first and last name, every previous name, and an answer about criminal record. An approximate date, a transliteration that differs from your passport, or a skipped conviction — even a minor one — can end in a refusal. An already-issued permit can be revoked for this reason.

Fix. Check every field against your passport character by character, list every previous name, and check yourself against the National Criminal Register (Krajowy Rejestr Karny) before answering "no" on the conviction question.

B4 — Geographic Names in a Language Other Than Polish

"Kiev" won't be accepted — it has to be "Kijów." "Paris" — has to be "Paryż." The entries go into a Polish database. English spelling or Cyrillic transliteration creates discrepancies, and those come back to you as formal deficiencies.

Fix. Use the field hints (the "i" icon), enter geographic names in Polish, and copy your own data character by character from your passport.

B5 — A Fictitious or "Just-in-Case" Address

Some applicants enter a friend's address, an outdated registration (meldunek), or a PO box. Every variant fails.

Fix. Enter the address where you actually live — if it differs from your registration, actual residence is what counts. A fictitious address causes correspondence problems through the whole procedure.

B6 — Missing or Incorrect Stamp Duty

The application involves two separate fees, to two separate accounts: the stamp duty (PLN 340–640, depending on permit type) and PLN 100 for the residence card. The rates are nationwide — only the recipient account differs. Missing either one results in a summons to pay, on pain of the application being returned.

Fix. Check the account on your voivodeship office's website, pay both fees separately, and attach both confirmations.

B7 — The Employer's or University's Signature Link

MOS automatically sends a signature link to the employer's or university's email address entered in the form. A wrong address means the link never arrives. An ignored link means you can't submit the application — MOS blocks the final step. The link and the draft both have limited validity — don't delay.

Fix. Before filling in the form, confirm the exact email address with HR or the dean's office, and warn them that a link requiring an electronic signature is coming.

B8 — Mailing or Emailing a Printed Form

A printed form, signed by hand, and sent by post or email counts as no application filed at all — it is left without consideration, regardless of the postmark date.

Fix. The only route that works: fill out the whole application in MOS and sign electronically — with a trusted profile (Profil Zaufany), a qualified signature, or a personal signature.

B9 — Believing the Whole Process Happens Online

The filing stage is fully online, but the procedure doesn't end when you submit the form — one mandatory in-person step remains: fingerprints, a signature specimen, and your original passport at the voivodeship office.

Fix. Monitor both the post at your home address and your MOS account. When the summons arrives, book the visit right away and bring your passport and the certificate (zaświadczenie), if one is issued in your procedure.

B10 — Scanning Only the Passport's Bio-Data Page

MOS requires a scan or photo of every page of your passport, not just the photo page — including blank pages and the cover.

Fix. Scan every page clearly, staying within the file-size limits shown on the MOS screen. Application photo: JPG, minimum 684×883 px, maximum 2.5 MB, no more than six months old, light background, face uncovered.

B11 — Sharing Your login.gov.pl Credentials with a "Helper"

Intermediaries offering to "handle MOS for you" sometimes ask for your login.gov.pl username and password. That's a breach of the terms of use and a real risk — your identity and your case are tied to that account.

Fix. A helper can sit next to you, but you log in and sign the application yourself. Nobody legitimate will ask for your login.

B12 — Closing the Browser Before Saving the UPO

The UPO is generated the instant the application is correctly submitted. Don't assume you'll come back to it later — without downloading it you can end up with no proof of submission.

Fix. Download the UPO and a copy of the application immediately, and save them in two places. The UPO confirms that you filed the application — it's a different document from the zaświadczenie, which the voivode issues separately, after formal verification.

B13 — Ignoring the Summons to Appear in Person

The costliest mistake on this list. After you file, the voivode summons you to appear in person, with a deadline of no less than 7 days from delivery. Failing to appear — or not completing all the required steps — ends with the procedure being discontinued: all your earlier work is lost and the fees are not refunded.

Fix. Treat the summons as a hard deadline, not a suggestion. Exempt are children under 6 years old and people who, due to illness or disability, cannot appear and have a medical certificate to that effect issued no more than 3 months before filing the application.

In closing

Before you click "Złóż wniosek," go through this list one more time and check your application point by point. The deadlines in this procedure are real — a late filing or an ignored summons can end your case. If anything is unclear, ask the Dopomo assistant or get help from a migrant legal-aid organization.

This article is general information, not legal advice. If your application has already been returned, or the legality of your stay is at risk, contact a lawyer or a migrant legal-aid organization before re-filing or appealing (SIP at interwencjaprawna.pl is a good starting point).

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