TL;DR: An Estonian OÜ must register for VAT (KMKR) once its taxable turnover with place of supply in Estonia exceeds EUR 40,000 from the start of the calendar year, and you have three working days to file once you cross it. The standard VAT rate is 24% as of 1 July 2025. Below the threshold, registration is voluntary - and for a lot of non-resident OÜs selling B2B across the EU, staying unregistered until you have to is the right call. The exception: register voluntarily if you have real input VAT to reclaim or your customers expect a VAT number. Everything below is verified against the Estonian Tax and Customs Board (EMTA).
The rule in one line
Your OÜ must register for VAT when its taxable turnover, counted from the beginning of the calendar year, exceeds EUR 40,000. That is the trigger. Not revenue, not profit - taxable turnover with place of supply in Estonia, as defined in the Value Added Tax Act.
This matters because most VAT questions from OÜ owners are actually questions about whether a given sale counts toward that EUR 40,000. The threshold itself is simple. The "what counts" part is where people get it wrong, so that is where most of this article goes.
An OÜ is an Estonian-established legal person, so it gets the EUR 40,000 calendar-year threshold even when you, the owner, live abroad. This is different from a genuinely foreign business with no Estonian establishment - those have no threshold and must register from their first taxable Estonian transaction. As an e-resident running an OÜ, the threshold applies to you.
What counts toward the EUR 40,000
Taxable turnover is the sum of your supplies that have their place of supply in Estonia and are subject to VAT - including zero-rated supplies. It is not your gross invoicing across every customer everywhere.
The practical version, for a typical service OÜ:
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Sales to Estonian customers (businesses and consumers) count.
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Zero-rated exports count toward the threshold even though the rate is 0%.
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The transfer of fixed assets and occasional financial or real estate transactions are excluded.
The trap most non-resident founders fall into: they assume every euro they invoice is "Estonian turnover." It often is not. If you sell services to a business customer in another EU country, the place of supply is usually that customer's country, not Estonia (the general B2B rule). That sale is outside your Estonian taxable turnover and does not push you toward EUR 40,000 - though it carries its own obligations, covered below.
So a consultant billing EUR 120,000/year entirely to German and Dutch companies can sit well under the Estonian threshold for mandatory registration, because almost none of that turnover has its place of supply in Estonia. The headline number on your invoices is not the number EMTA cares about.
Mandatory registration: the trigger and the clock
Once taxable turnover exceeds EUR 40,000 from the start of the year, registration is mandatory and you have three working days to submit the application to EMTA. Miss it and you are still liable for the VAT from the date the obligation arose - registering late does not erase the period in between.
The count resets each calendar year. Crossing EUR 40,000 in November does not mean you needed to register in January; it means you register in November when you actually cross it. Track the running total month by month so the three-day window does not surprise you on a single large invoice.
After approval, EMTA issues your VAT number (KMKR number) and you start charging 24% on taxable Estonian supplies, filing the monthly VAT return (KMD), and you can deduct input VAT on business purchases. The VAT return is due by the 20th of the following month.
The 24% rate and what changed
The standard Estonian VAT rate is 24%, effective 1 July 2025. It rose from 22%, and the increase is permanent. Reduced rates of 13% and 9% apply to specific categories, and 0% applies to exports and certain cross-border supplies. For most OÜs selling digital services or consulting, 24% is the rate that applies to your Estonian-supply invoices.
If you are modeling pricing, model 24%. Anyone quoting 20% or 22% is working from pre-July-2025 figures.
Voluntary registration: when it is worth it
You can register before hitting EUR 40,000. Whether you should comes down to two questions: who are your customers, and how much input VAT are you sitting on.
Register voluntarily when:
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Your customers are mostly VAT-registered businesses. They reclaim the VAT you charge, so it costs them nothing, and a VAT number signals you are a real, established operation. Some B2B buyers will not onboard a vendor without one.
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You have significant input VAT to recover - large software, equipment, subcontractor, or setup costs where the 24% you paid is real money you would rather get back.
Stay unregistered when:
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Your customers are consumers or non-VAT-registered businesses. Charging them 24% makes you 24% more expensive with nothing they can reclaim. That is a direct competitiveness hit.
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Your costs are low and mostly outside Estonia, so there is little input VAT to reclaim and registration just adds monthly filing overhead.
The honest default for a lean, B2B, EU-cross-border OÜ: do not register voluntarily. If your sales to other EU businesses fall under the reverse charge (next section) and your Estonian taxable turnover is genuinely under EUR 40,000, voluntary registration mostly buys you paperwork. Register the moment a real reason appears - a big VAT-bearing purchase, or a customer who needs your number - not pre-emptively because it feels more legitimate.
Cross-border EU rules you cannot skip
This is where the "I'm under the threshold" comfort breaks for a lot of founders, because cross-border obligations exist independently of the EUR 40,000 trigger.
B2B services to other EU businesses: reverse charge
When your OÜ sells services to a VAT-registered business in another EU country, the general rule places the supply in the customer's country and the customer accounts for the VAT under the reverse charge. You invoice without Estonian VAT, note the reverse charge, and your customer self-accounts.
But to apply the reverse charge correctly and report these sales, your OÜ generally needs a valid VAT number to validate against the customer's VAT number (VIES) and to file the recapitulative report (VD). In practice, a steady stream of EU B2B sales is one of the strongest reasons an under-threshold OÜ ends up registering - not because Estonian turnover crossed EUR 40,000, but because the cross-border mechanics need a number to function cleanly. Confirm your exact obligation with EMTA before assuming you can run EU B2B indefinitely without registering.
B2C across the EU: OSS
When you sell to consumers in other EU countries - digital products, online services, goods - you generally charge the VAT rate of the customer's country once you pass the EU-wide distance-selling threshold, and you report it through the One Stop Shop (OSS) rather than registering for VAT in every country. OSS is the mechanism that keeps you from needing 27 registrations.
The detail here depends heavily on what you sell and to whom, and the rules are genuinely intricate. If a meaningful share of your sales is B2C across borders, treat OSS as a real workstream and get specific advice. Do not improvise EU consumer VAT.
How to register with EMTA
Registration runs through the EMTA e-services environment (e-MTA), and you can also submit via the e-Business Register, by email, or through a service bureau. The flow:
- Log in to e-MTA with your e-Residency digital ID (or your representative's access).
- Submit the application to be registered as a taxable person (VAT payer). For mandatory registration, do this within three working days of crossing EUR 40,000.
- EMTA reviews and decides - the authority has up to five working days from receipt to make its decision, and may ask you to substantiate that you are conducting or about to conduct business in Estonia.
- On approval you receive your KMKR number and your VAT obligations begin from the registration date.
The "prove you do business" step trips up shell-ish setups. EMTA can ask for evidence of genuine economic activity, especially for voluntary applications. Have contracts, invoices, or a clear business plan ready. This ties directly into substance - the same theme that runs through Estonian corporate tax for non-residents, covered in our guide on Estonian corporate tax for non-residents.
Should you register early? Our take
Default to not registering until you must, unless you are B2B-heavy or sitting on reclaimable input VAT.
For the typical lean non-resident OÜ - a consultant or small software business selling to other EU companies - voluntary registration adds monthly filing without a clear payoff, and charging VAT to non-business customers actively hurts you. The EUR 40,000 threshold exists precisely so small operators are not dragged into VAT administration prematurely. Use that headroom.
Flip the moment one of the real triggers appears: a customer needs your VAT number to work with you, you are about to make a large VAT-bearing purchase, your EU B2B reporting genuinely requires registration, or you are closing in on EUR 40,000 of Estonian taxable turnover. Then register deliberately, not as a reflex.
If you have not formed the company yet, get the structure right first - our walkthrough on forming an Estonian company as a non-resident covers the setup decisions that make the VAT question easier to answer later.
If you want a second set of eyes on whether your OÜ should register now or wait - and how your cross-border sales actually map to the threshold - that is exactly the kind of call worth getting right before you file. Reach out and we will talk it through against your real numbers.
FAQ
What is the VAT registration threshold for an Estonian OÜ in 2026?
EUR 40,000 of taxable turnover with place of supply in Estonia, counted from the beginning of the calendar year. Once you exceed it, registration is mandatory and you have three working days to apply to EMTA. The count resets each January.
What is the current standard VAT rate in Estonia?
24%, effective from 1 July 2025 (up from 22%, and now permanent). Reduced rates of 13% and 9% apply to specific categories, and 0% applies to exports and certain cross-border supplies.
Do my sales to other EU countries count toward the EUR 40,000 threshold?
Generally no for B2B services - those usually have their place of supply in the customer's country and fall under the reverse charge, so they sit outside your Estonian taxable turnover. They do carry their own reporting obligations. EU B2C sales are handled through OSS. Confirm your specific case with EMTA.
Can I register for VAT voluntarily before hitting the threshold?
Yes. It is worth it when your customers are VAT-registered businesses (who reclaim the VAT) or when you have significant input VAT to recover. It is usually not worth it if you sell to consumers or have low Estonian-based costs, since it adds monthly filing and can make you less competitive.
Does a non-resident e-resident owner change the threshold?
No. An OÜ is an Estonian-established legal person, so the EUR 40,000 calendar-year threshold applies regardless of where the owner lives. The no-threshold "register from the first transaction" rule applies to genuinely foreign businesses with no Estonian establishment, not to your OÜ.
How do I actually register, and how long does it take?
Apply through the e-MTA portal (or e-Business Register / email / a service bureau) as a taxable person. EMTA has up to five working days from receipt to decide and may ask you to substantiate genuine business activity. On approval you get your KMKR number and start charging and filing VAT from the registration date.
