The A1 Certificate: What It Is and Why It Matters to You
5 min read · updated August 2026
The one thing an A1 decides
When you work in a country other than the one you are employed in, two social security systems could in principle claim you. The A1 settles it: it certifies that you remain insured in the sending country — in our case the Czech Republic — for the duration of the posting.
That single fact is what makes the whole arrangement work. Because you stay in the Czech system, the host state does not treat you as a local hire who needs local registration and local permits.
Who applies and how long it takes
Your employer applies to the Czech Social Security Administration (ČSSZ). You are not a party to the application and cannot file it yourself. Straightforward cases are processed in two to four weeks.
The certificate names you, your employer, the host country, the host site and the exact period. Anything outside those parameters is not covered.
What to check before you travel
- Your name and passport number are correct. A typo turns a valid document into an invalid one at inspection.
- The dates cover your whole trip. Including travel days.
- The host country is right. An A1 for Germany does not cover work in Austria.
- You have a copy on your phone and on paper. Labour inspections at construction and logistics sites are frequent and unannounced.
If your employer cannot produce the certificate before departure, do not travel. The legal exposure sits with them, but the disruption — being sent off site, losing days of pay, sometimes being sent home — lands on you.
Limits worth knowing
A posting is temporary by definition. A single posting runs up to 24 months. There must be a genuine ongoing employment relationship with the sending employer, and the sending employer must carry out substantial activity in the sending country — a letterbox company posting everyone abroad is exactly what the rules exist to stop.
You are entitled to the host country's minimum wage and core working conditions for your sector during the posting. If someone offers you a German posting at Czech rates, that is not a grey area — it is a breach.
Frequently asked questions
Can I apply for an A1 myself?
No. Only the employer can apply, through the Czech Social Security Administration.
How long is it valid?
For the period stated on the certificate, up to 24 months for a single posting.
What if I am inspected without one?
The employer faces the penalty, but you can be removed from the site and lose working days. Always carry a copy.
Does the A1 give me the right to live in the host country?
No. It covers social security only. Your residence right comes from your Czech employee card and the EU rules on posted workers.
Is my pay taxed in Czechia or in the host country?
Social security stays in Czechia. Income tax follows separate rules and can shift to the host country on longer postings — ask your employer for the specifics of your case.
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