OSS Registration for Estonian E-commerce Companies: Step-by-Step, With the 2026 24% Rate Applied
If your Estonian OÜ sells to consumers in other EU countries, two numbers decide almost everything: €10,000 and 24%. Below €10,000 of cross-border B2C sales in a calendar year you keep charging Estonia’s 24% rate. Above it, every sale carries the customer’s country rate — 19% in Germany, 25.5% in Finland — and the Union One Stop Shop (OSS) lets you declare all of it in one quarterly return to the Estonian Tax and Customs Board (EMTA) instead of registering in every member state. Here is the e-MTA registration click by click, the filing calendar, and the part everyone gets wrong.
The short answer
The distance-selling threshold is €10,000 per calendar year, EU-wide — B2C distance sales of goods plus digital services to all other member states combined. It is not €10,000 per country.
Below the threshold you may charge Estonian VAT at 24% on cross-border B2C sales. Above it, you charge the customer’s country rate, from the sale that breaks the threshold onwards.
Union OSS lets you declare and pay VAT for every EU consumer country in one quarterly return filed with EMTA, which forwards each country’s share.
Register in e-MTA under Registers and inquiries → Registration → Registering as a user of special schemes for e-commerce and services (OSS/IOSS). An Estonian VAT number (KMKR) comes first.
The return and payment are both due by the last day of the month following the quarter: 30 April, 31 July, 31 October, 31 January. The deadline does not shift for weekends or holidays.
OSS never covers Estonian domestic sales and never covers B2B. Domestic B2C stays at 24% on the monthly KMD, due by the 20th.
What is the Union OSS, and why does an Estonian OÜ need it?
The Union One Stop Shop is an optional EU special scheme that lets a business established in one member state declare and pay the VAT it owes in every other member state through one electronic return filed at home. For an Estonian OÜ the Member State of identification is Estonia: the return goes to EMTA, the payment goes to your EMTA prepayment account, and EMTA distributes each country’s VAT. The legal basis is Articles 369a–369k of the VAT Directive (2006/112/EC) and the special arrangement chapter of the Käibemaksuseadus. See EMTA’s special schemes page and the European Commission’s One Stop Shop portal.
OSS exists because the old system was unworkable for small sellers. Before 1 July 2021 each member state set its own distance-selling threshold, commonly €35,000 or €100,000, and crossing one meant a local registration and a local return in the local language. Since then there is one EU-wide €10,000 threshold and one scheme. OSS does not reduce the VAT you owe by a cent — it reduces the number of tax authorities you owe it to, from many to one.
When does the €10,000 threshold change which VAT rate you charge?
The threshold is €10,000 net of VAT, measured across the whole calendar year and every other EU member state combined. Sell €6,000 to Finnish consumers and €5,000 to German consumers and you are at €11,000 — over the line, even though neither country individually saw much. It aggregates two kinds of supply: intra-Community distance sales of goods, and TBE services (telecoms, broadcasting and electronically supplied services — software downloads, SaaS, online courses, e-books).
The switch happens mid-transaction, not at year end. The sale that pushes your total past €10,000 is already taxed in the customer’s country, and so is every sale after it; you do not re-rate earlier invoices. Crossing in one year also binds you for the whole of the following calendar year, however low your sales fall. That is why most sellers expecting real EU volume opt in from day one.
Counts: goods dispatched from Estonia to private consumers elsewhere in the EU, plus digital, telecom and broadcasting services to EU consumers.
Does not count: Estonian domestic sales, B2B sales to VAT-registered EU businesses, exports outside the EU.
Blocks the threshold entirely: a fixed establishment in more than one member state, or dispatching goods from stock held outside Estonia. Destination VAT then applies from the first euro.
Voluntary opt-in: you may choose destination taxation early, but the choice binds you for at least two calendar years.
Why does Estonia’s 24% rate apply to some sales and not others?
Estonia’s standard VAT rate has been 24% since 1 July 2025, and it applies to supplies whose place of supply is Estonia — nothing more. A sale to a consumer in Tallinn is supplied in Estonia, so it takes 24%. A sale to a consumer in Munich, once you are past the €10,000 threshold, is supplied in Germany, so it takes Germany’s 19%. Your OÜ being Estonian and your board being e-residents change none of this: the rate follows the customer’s location, not the company’s.
24% is not “your company’s VAT rate”. It is Estonia’s rate, and it belongs only on sales whose place of supply is Estonia. Every cross-border B2C sale above the €10,000 threshold carries the destination country’s rate, and OSS is simply the pipe that gets that money to the right treasury.
This has a pricing consequence founders miss. Advertise one gross price across the EU and your net revenue differs by country. A €100 gross sale to a Finnish consumer at 25.5% leaves €79.68 net and €20.32 of VAT. The identical €100 to a German consumer at 19% leaves €84.03 net and €15.97 of VAT; to an Estonian consumer at 24%, €80.65. On thin margins, country mix quietly moves your P&L.
The destination country’s whole rate structure applies, not just its standard rate. Sell printed books into a country with a reduced book rate and you charge that reduced rate, not Estonia’s. Classification follows the destination state’s own rules, which is the most common source of OSS underpayments. If your catalogue holds anything plausibly reduced-rated, confirm it per country before launching there.
Worked examples: which rate, and which return?
Read the table as a decision sequence: identify the place of supply, then the rate follows, then the return follows. Rates shown are the 2026 standard rates; confirm them before configuring your checkout, since member states change them.
What you sell, and to whom | Place of supply | VAT rate you charge | Where you declare it |
|---|---|---|---|
Phone case shipped from Tallinn to a private customer in Tartu | Estonia | 24% Estonian standard rate | Monthly Estonian KMD, due the 20th |
Phone case shipped to a consumer in Germany, EU B2C sales still under €10,000 this year | Estonia | 24% — threshold not crossed | Monthly Estonian KMD |
Same shipment to Germany, EU B2C sales already past €10,000 | Germany | 19% | Quarterly OSS return to EMTA |
Sweater shipped to a consumer in Finland, over the threshold | Finland | 25.5% | Quarterly OSS return to EMTA |
Sweater shipped to a consumer in France, over the threshold | France | 20% | Quarterly OSS return to EMTA |
SaaS subscription sold to a private individual in Latvia, over the threshold | Latvia | 21% | Quarterly OSS return to EMTA |
Goods sold to a VAT-registered business in Ireland with a valid VIES number | Ireland — customer self-accounts | 0%, reverse charge | Monthly KMD plus the VD report |
Goods shipped from your fulfilment warehouse in Poland to a consumer in Poland | Poland — a domestic supply there | 23% Polish rate | Polish local VAT return, never OSS |
Goods shipped to a consumer in Norway, Switzerland or the UK | Outside the EU | 0% Estonian VAT, an export | Monthly KMD; local import rules apply |
Two rows deserve a second look. Fail to validate a business customer’s VAT number in VIES and you push a B2B sale into your OSS return, paying Irish VAT nobody owed. And goods that start and end inside the same foreign country are a domestic supply there — no OSS filing replaces a Polish VAT registration.
How do you register for OSS in Estonia, step by step?
Registration is entirely online in e-MTA and takes about fifteen minutes once you have an Estonian VAT number, an ID-card, Mobile-ID or Smart-ID login, and the company’s bank details. Under the Union scheme that VAT number is also the scheme identifier — EMTA issues no separate OSS number.
Confirm you need it. Add up your cross-border B2C sales for the current calendar year. Past €10,000, or holding stock in another member state, means destination taxation and therefore OSS or local registrations.
Get an Estonian VAT number (KMKR). Compulsory above €40,000 of taxable turnover in a calendar year, voluntary below. Union OSS requires a VAT number in the Member State of identification, so crossing €10,000 abroad while staying under €40,000 at home still means registering.
Grant e-MTA access rights. A board member must give whoever files the package covering registrations and VAT declarations. Missing rights is the most common reason a registration stalls.
Log in to e-MTA and open Registers and inquiries → Registration → Registering as a user of special schemes for e-commerce and services (OSS/IOSS).
Choose the Union scheme (OSS), not the import scheme (IOSS). IOSS is a separate scheme for imported goods in consignments valued up to €150.
Complete the application: company identifiers, contact email, the bank account for refunds, the start date you want, any fixed establishments abroad, and any previous OSS or IOSS registration.
Submit and wait for confirmation in your e-MTA inbox. There is no state fee.
Reconfigure your store and invoicing to charge the destination rate by ship-to country and show that rate and country on invoices. Do this before the start date, not after.
Lock in the four filing dates — 30 April, 31 July, 31 October, 31 January — as hard calendar reminders.
Tell your accountant in writing which quarter the scheme starts, so the KMD and the OSS return do not double-count the same revenue.
The scheme normally starts on the first day of the calendar quarter after the quarter in which you applied. One exception matters: if your first qualifying supply falls in the same quarter you apply, the scheme can run from that transaction, provided you file the application by the 10th day of the following month. Miss that window and the sales in between fall outside the scheme.
When is the OSS return due, and how do you pay?
The OSS tax period is the calendar quarter, and both the return and the payment are due by the last day of the month following it. Unlike most Estonian domestic deadlines, this one does not roll forward for a weekend or public holiday — 31 January is 31 January even when it is a Saturday. Payment counts as made when the money reaches EMTA’s account, so a transfer sent on the deadline is easily late.
Quarter | Period covered | Return and payment both due |
|---|---|---|
Q1 | 1 January – 31 March | 30 April |
Q2 | 1 April – 30 June | 31 July |
Q3 | 1 July – 30 September | 31 October |
Q4 | 1 October – 31 December | 31 January of the following year |
The return is electronic only, always in euros, broken down by Member State of consumption and by VAT rate within each state. A nil return is mandatory: no qualifying supplies still means filing, showing zeroes. You pay into your EMTA prepayment account using the company’s reference number, quoting the return’s unique reference.
Corrections work differently from the domestic KMD. You cannot amend a submitted OSS return; you report the adjustment in a later return, naming the original tax period, the Member State of consumption and the corrected amount, within three years of the original due date. Balances are calculated per country, so a negative figure for one member state does not offset another — that country refunds you separately.
What does OSS not cover, and what does it?
OSS is narrower than most founders assume: it covers cross-border B2C supplies and nothing else. Every other stream keeps its existing home — domestic sales and intra-Community B2B on the KMD, imports through customs, foreign input VAT through a separate refund procedure.
Transaction | In the Union OSS return? | Where it actually goes |
|---|---|---|
Intra-Community distance sales of goods to EU consumers | Yes | Quarterly OSS return to EMTA |
Digital, telecom and broadcasting services to EU consumers | Yes | Quarterly OSS return to EMTA |
B2C sales to Estonian consumers | No | Monthly KMD at 24%, due the 20th |
B2B supplies to VAT-registered EU businesses | No | Monthly KMD plus VD report, reverse charge |
Goods stored abroad and sold to consumers in that same country | No | Local VAT registration and return there |
Input VAT paid on business costs in another member state | No | EU refund procedure under Directive 2008/9/EC |
Imported goods in consignments up to €150 sold to consumers | No | The separate IOSS scheme, filed monthly |
Sales to consumers outside the EU | No | Treated as exports on the KMD |
The input VAT line costs real money. You cannot deduct foreign VAT on the OSS return — it has no input side. German VAT on a marketing invoice or Polish VAT on fulfilment fees is recovered through the cross-border refund procedure under Directive 2008/9/EC, filed via e-MTA. Estonian input VAT stays on your monthly KMD.
How do OSS and your monthly Estonian KMD fit together?
You run both returns in parallel and they never overlap. The monthly KMD, due by the 20th of the following month, handles Estonian domestic supplies at 24%, intra-Community supplies and acquisitions, imports, exports and all Estonian input VAT. The quarterly OSS return handles only cross-border B2C supplies, and that VAT is not Estonian tax. Your system therefore needs a clean tax-code split at the point of sale, keyed on ship-to country and on whether the customer gave a valid VAT number.
That split is easy to design and easy to break. Marketplace sales, refunds, partial returns and currency conversion all need explicit treatment, and one mis-tagged product category can put months of German sales in the wrong bucket. Our checklist of the documents your Estonian accountant needs each month covers what to hand over.
What records do you have to keep?
OSS records must be kept for 10 years from the end of the year in which the transaction was made, and made electronically available without delay on request to EMTA or any Member State of consumption. That is far longer than the three-year correction window, and deregistering does not reset the clock. The required content sits in Article 63c of Council Regulation 282/2011; the Commission publishes an optional XML format, SAF-OSS.
Member State of consumption, type of supply and date of supply.
Taxable amount and currency, VAT rate, VAT amount, and any later increase or decrease.
Payments on account with dates, and invoice details where one was issued.
The evidence locating the customer — for digital services, two non-contradictory pieces, such as billing address, IP address, bank details or SIM country code.
What goes wrong most often?
Nearly every OSS problem traces back to one of these, and all cost less to prevent than to fix. Fixing means restating quarters, paying interest to a foreign treasury, and at worst losing the scheme for two years.
Charging 24% to everyone after crossing the threshold. You still owe the destination VAT, and you rarely get to re-invoice consumers for the difference.
Treating €10,000 as a per-country figure. It is one EU-wide total, and small amounts to six countries add up fast.
Skipping nil returns. Zero sales still requires a filed return, and missed filings trigger exclusion.
Deducting foreign input VAT on the OSS return. Use the Directive 2008/9/EC refund procedure instead.
Ignoring stock held abroad. Goods in a foreign fulfilment warehouse generally need a local VAT registration, OSS or not.
Not validating VAT numbers in VIES. An unvalidated business customer becomes a B2C sale and you pay VAT nobody owed.
Missing three consecutive returns. Persistent non-compliance means exclusion plus eight quarters of quarantine — two years with no OSS or IOSS anywhere in the EU.
Does e-Residency change any of this?
e-Residency changes how you file, not what you owe. The digital ID lets you log into e-MTA, sign the OSS application and submit quarterly returns from anywhere, so everything above can run from a laptop in São Paulo or Bangkok. It does not make you an Estonian tax resident, move your customers, or alter a single VAT rate — see why the claim that e-Residency avoids taxes entirely is wrong and how to check your country’s double tax treaty with Estonia. Sort out VAT registration, OSS registration and checkout tax logic before your first big campaign; rates are trivial to change in a store’s settings and expensive to fix across thousands of past orders. If you are also deciding how to take money out, salary versus dividends is the next decision.
Frequently asked questions
Is OSS registration mandatory for an Estonian e-commerce company?
No. OSS is optional, but destination VAT is not. Once your EU-wide cross-border B2C sales pass €10,000 in a calendar year, you must charge and remit VAT in each customer’s country. Your only choice is whether to do that through one OSS return filed with EMTA or through separate VAT registrations in each member state.
What if I sell less than €10,000 a year across the EU?
Below €10,000 you may treat cross-border B2C sales as Estonian supplies and charge 24%, reporting them on your monthly KMD. This simplification applies only if you are established in Estonia alone and dispatch the goods from Estonia. You can still opt into destination taxation voluntarily, but that choice binds you for at least two calendar years.
Does OSS replace my monthly Estonian VAT return?
No, you file both. The monthly KMD is still due by the 20th and covers Estonian domestic supplies at 24%, intra-Community B2B, imports, exports and input VAT deductions. The quarterly OSS return covers only cross-border B2C supplies.
Which VAT rate do I charge a German consumer if my company is Estonian?
Germany’s rate, currently 19%, as soon as you are over the €10,000 EU-wide threshold. Below the threshold you may charge Estonia’s 24%. The country of incorporation does not determine the rate — the place of supply does, and for cross-border B2C above the threshold that is the customer’s country.
Can I reclaim VAT on foreign business expenses through OSS?
No. The OSS return has no input VAT section. VAT paid on costs in another member state is recovered through the electronic cross-border refund procedure under Council Directive 2008/9/EC, submitted via e-MTA. Estonian input VAT is deducted on the monthly KMD as normal.
What happens if I miss an OSS return or payment?
EMTA issues a reminder shortly after the deadline, and interest and penalties are then charged by each Member State of consumption under its own rules, not by Estonia. Missing three consecutive quarterly returns counts as persistent non-compliance and gets you excluded, with an eight-quarter quarantine.
What if I store stock in a fulfilment warehouse in another EU country?
You almost certainly need a local VAT registration there in addition to OSS. Goods dispatched from a Polish warehouse to a consumer in Poland are a domestic Polish supply, taxed at 23% on a Polish return. Holding stock outside Estonia also removes access to the €10,000 threshold, so destination VAT applies from the first euro.
