An Estonian company hires someone who lives in Finland, or an existing employee moves to Spain and keeps working, or a developer on the payroll spends half the year with family in Germany. In every version of this the owner asks us the same thing: do we just keep running Estonian payroll? The answer is sometimes yes, often no, and the reason it varies has almost nothing to do with how the contract is written.
Social security is decided in one country only, and work decides which
Inside the EU, the EEA and Switzerland, social security is coordinated by Regulation (EC) 883/2004. Its first principle is that a person is covered in one member state at a time, never two and never none. Article 11(3)(a) then gives the default rule: the competent state is the one where the work is actually done.
Read that default rule carefully, because it is the whole problem. It does not say where the employer is registered. It does not say where the contract was signed, which law it names, or which currency pays it. An employee sitting at a desk in Helsinki is working in Finland, whatever the Estonian company she works for would prefer. Unless one of the exceptions below applies, Finnish social security is the competent system and the Estonian employer, not the employee, carries the obligation to make that happen.
Income tax follows a different rule, which is why people get this wrong
This is the single most common error we see, and it is an understandable one. Payroll feels like one thing, so people assume one answer covers it. It does not. Social security follows Regulation 883/2004. Employment income tax follows the double tax treaty between the two countries, normally Article 15 of the treaty, with the familiar test around physical presence and the 183 day threshold.
Two different instruments, two different tests, two possible answers. So an employee can quite correctly end up inside the Estonian social security system while their salary is taxable in their country of residence, or the reverse. Neither outcome is a mistake or a loophole; it is just what the two rule sets produce when you apply them separately, which is what you must do.
If you take one thing from this page, take this. Do not reason from one answer to the other. Work out the social security country under Regulation 883/2004, then work out the income tax country under the treaty, as two separate exercises. Getting the first right and assuming the second follows is how an employer ends up owing withheld tax in a country it never registered in.
Estonia joined the cross-border telework agreement on 1 February 2026
This is the newest and most useful part of the picture, and a lot of Estonian guidance written before this year does not mention it at all.
There is a multilateral Framework Agreement on the application of Article 16(1) of Regulation 883/2004 to habitual cross-border telework. It has been in force since 1 July 2023, and Finland, Germany and Spain have all been signatories from that first day. Estonia joined later: the agreement took effect for Estonia on 1 February 2026.
What it does is let an employee telework from their country of residence for less than 50% of total working time while the employer’s state, Estonia, remains the competent social security system. Before the agreement, the relevant threshold for a person working in two states was 25%, which meant one day a week at home in another country was often enough to move the whole case abroad. Under the agreement there is real room: two days a week of telework from Helsinki or Madrid can sit inside the Estonian system.
Three conditions that matter in practice. It is not automatic: the employer and the employee apply for it jointly. An A1 is still issued and still needed, so there is no less paperwork, only a better outcome. And both countries must be signatories, which for an Estonian employer means the relevant date is February 2026, not July 2023.
The three routes that keep an employee inside the Estonian system
There are exactly three, and they do not overlap. Working out which one you are in is the first useful thing to do.
| Route | Legal basis | The limit | Typical case |
|---|---|---|---|
| Posting | Reg 883/2004 Art 12 | Up to 24 months | Sent abroad for a defined project |
| Work in two or more states | Reg 883/2004 Art 13, threshold in Reg 987/2009 Art 14(8) | Under 25% of working time or pay in the state of residence | Travels constantly, lives in one country, works across several |
| Habitual cross-border telework | Framework Agreement under Art 16(1) | Under 50% of total working time in the state of residence | Lives abroad, works from home part of the week |
Posting, under Article 12, is the oldest route and the narrowest. It runs up to 24 months, and only where the employer normally carries out substantial activity in the posting state, the direct employment relationship continues throughout, the expected duration is under 24 months from the start, and the worker is not replacing another posted person. Going beyond 24 months is possible but needs a specific Article 16 agreement between the two states, which is a negotiation rather than a form.
Work in two or more member states, under Article 13, turns on whether a substantial part of the activity happens in the state of residence. Substantial is defined, not left to judgement: Article 14(8) of Implementing Regulation (EC) 987/2009 sets it at at least 25% of working time or remuneration. Below 25% in the country of residence, the employer’s state stays competent. At or above it, the country of residence takes the whole case, including the part of the work done elsewhere.
The arithmetic there is unforgiving and worth doing honestly. One day a week at home is 20% and sits inside the employer’s state. Two days is 40% and does not. That cliff edge is exactly the problem the telework agreement was written to soften, which is why the 50% route is usually the better one to aim for now that Estonia is in it.
The A1 certificate, and what the absence of one actually means
None of the three routes works on assertion. The document that proves which country’s system covers a person is the A1 certificate, formally Portable Document A1. In Estonia it is issued by the Social Insurance Board, Sotsiaalkindlustusamet. You apply digitally through eesti.ee or on paper, and an electronic application that meets the conditions is normally answered by the next working day, with up to 30 days in other cases.
The next working day is fast enough that there is no good reason to work without one, and that is the practical point. An A1 is not a formality you catch up on later. It is the evidence that a foreign authority or inspector looks for, and without it the default rule reasserts itself: the employee is working in their country and that country’s system applies, with the employer owing the contributions there. Apply before the arrangement starts, not after someone asks.
Finland, which is the case we are asked about most
Estonia and Finland are 85 kilometres apart and a great many Estonian companies have someone living on the other side. So it is worth being concrete about what the Finnish position is when no A1 keeps the person in Estonia.
The Finnish Centre for Pensions states the baseline plainly: an employee working in Finland must be insured in Finland, and it makes no difference what the employee’s nationality is or where the employer is based. The foreign employer must arrange and pay Finnish statutory social insurance, including earnings-related pension insurance, and report the earnings to the Finnish Incomes Register. There is one piece of flexibility: the employer may agree with the employee that the employee takes out the statutory insurance in Finland on the employer’s behalf, under a power of attorney.
That is the default, and it is the thing an A1 displaces. Get the A1 and the person stays in the Estonian system. Do not get it and an Estonian company has acquired a Finnish payroll obligation, usually without noticing, and usually discovering it some months in.
Germany and Spain, where we will tell you what we do not know
Both are signatories to the telework agreement and have been since July 2023, so the 50% route is open for an Estonian employer with staff in either country. The structural picture is the same as Finland: without an A1, the country where the work happens expects to insure the person, and the obligation sits with the employer.
What the German and Spanish systems then require in detail, which registers, which deadlines, which filings, we are not going to describe, because we have not verified it and an Estonian accounting firm improvising on German social insurance procedure is worth nothing to you. What we do is settle the Estonian side and the Regulation 883/2004 question, and tell you clearly at what point you need an adviser in the other country. For a Spanish or German payroll registration, that point arrives early.
Permanent establishment, the risk nobody prices in
There is a second question hiding behind the payroll one. An employee working from home in another country can, in some circumstances, create a taxable presence there for the employer, a permanent establishment, which is a corporate tax problem rather than a payroll one and a much more expensive one.
We are deliberately not giving you a rule or a number of days for this, because there is not a reliable one. It is fact-dependent and it turns on what the person actually does, in particular whether they habitually conclude contracts or act as a dependent agent of the company. What we will say is that the risk is real, that it is assessed in the other country under that country’s law and the relevant treaty, and that a sales role abroad deserves a proper look while a back office role usually deserves less worry. If the role is commercial and the arrangement is permanent, get it checked before it has been running for a year.
What to do, in order
- Write down where the work physically happens, in days per month. Not where the contract says, where the person sits.
- Work out which of the three routes fits, if any: posting under 24 months, under 25% in the state of residence, or under 50% telework under the Framework Agreement.
- Apply for the A1 through the Social Insurance Board before the arrangement starts.
- Separately, work out the income tax country under the treaty. Do not assume it matches the social security answer.
- If the other country is competent for anything, engage an adviser there. That is not a step you can skip from Tallinn.
- Ask whether the role creates a permanent establishment risk, and treat a commercial role differently from an administrative one.
We handle steps one, two, three and four, and the Estonian payroll that follows from them. We run the cross-border assessment before the first payment rather than after a foreign authority raises it, because the cost of getting this wrong is not a fine, it is a retrospective social insurance liability in a country you are not registered in. If you want the Estonian side run properly once the structure is settled, that is our payroll service.
And if what you actually want is to hire someone abroad with no Estonian connection at all, say so early. Sometimes the honest answer is that an Estonian employment contract is the wrong instrument and you need a local employer of record, which is not a service we sell and not a thing we will talk you out of.
Frequently asked questions
My employee lives in Finland and works for my Estonian company. Where are the payroll taxes paid?
By default in Finland, because Regulation 883/2004 makes the country where the work is done the competent one. The exceptions are a posting of up to 24 months, work in two or more states with under 25% in the country of residence, or telework of under 50% under the Framework Agreement that Estonia joined on 1 February 2026. Each needs an A1 certificate.
How much can an employee work from another country before the social security moves?
It depends which rule you are under. For a person working in two or more member states, the threshold is 25% of working time or remuneration in the country of residence, set by Article 14(8) of Regulation 987/2009. Under the cross-border telework Framework Agreement the limit is less than 50% of total working time, which is far more generous.
Is Estonia part of the EU cross-border telework agreement?
Yes, with effect from 1 February 2026. Finland, Germany and Spain have been signatories since 1 July 2023. Because Estonia joined later, guidance written for Estonian employers before 2026 often does not mention the 50% route at all.
Who issues the A1 certificate in Estonia and how long does it take?
The Social Insurance Board, Sotsiaalkindlustusamet. You apply through eesti.ee or on paper, and an electronic application that meets the conditions is normally answered by the next working day. Other applications can take up to 30 days. Apply before the arrangement starts, not after.
Can income tax and social security be due in different countries?
Yes, and this is normal rather than an anomaly. Social security is decided by Regulation 883/2004 and income tax by the double tax treaty, usually Article 15 with its 183 day test. They are separate questions with separate answers, so each has to be worked out on its own.
Does an employee working from home abroad create a permanent establishment for my company?
Sometimes, and it is fact-dependent rather than governed by a day count. What matters is what the person does, particularly whether they habitually conclude contracts or act as a dependent agent. It is assessed under the other country’s law and the relevant treaty, so a commercial role abroad deserves a proper review and an administrative one usually less.
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General information, not tax advice
This article reflects Estonian law as it stands on the date shown. Rules change and individual circumstances differ - confirm your own position with us before acting.