A letter from the Estonian Tax Board: what it means and what to do
If your Estonian company gets a letter from EMTA, first work out which of five common categories it falls into, then check the letter itself for a stated deadline, and get the full document to your accountant within 24 hours. Most EMTA correspondence is routine, not a penalty: a missing declaration, a mismatch between your KMD and KMD INF, a payroll or VAT query, an arrears notice, or a routine information request. This guide walks through each category, tells you which ones carry a real, already-existing deadline and which don’t, and lays out exactly what to do - and what not to do - once the letter is in front of you.
The short answer
EMTA letters to a company fall into five categories: a missing declaration, a KMD/KMD INF mismatch, a payroll or VAT query, an arrears notice, or a routine information request.
Only two of those carry a deadline that already exists in law regardless of the letter’s wording: a missing declaration (the original filing date has passed) and an arrears notice (interest is already accruing).
In the first 24 hours: read the whole letter, note the exact date and reference number, forward the complete document to your accountant, and check your own e-MTA account.
Unopened e-MTA messages still count as delivered - if nobody opens one within 5 working days, EMTA posts a paper copy to your company’s registered legal address.
Late-payment interest on an unpaid balance runs at 0.06% a day (about 21.9% a year) from the original due date, letter or no letter.
Never reply from memory, and never send a document your accountant hasn’t reviewed first - accuracy matters more than speed.
Verified: August 2026.
What kinds of letters does EMTA actually send to a company?
Estonian Tax and Customs Board (EMTA) correspondence to a company almost always falls into one of five categories: a missing declaration notice, a KMD/KMD INF mismatch, a payroll or VAT query, an arrears notice, or a routine information request. None of these five, by itself, means you’re being fined. Most start as an automated check flagging something in EMTA’s own systems, not a person deciding to come after your company specifically. The tone of EMTA’s letters is administrative, not adversarial - they read as questions and confirmations, not accusations. Knowing which of the five you’ve received tells you almost everything about how urgent it is and who should read it first. The rest of this article works through each category, which ones carry a real deadline, how e-MTA actually delivers these letters, and the sequence to follow in the first day.
Category | What it usually means | Hard deadline? | First move |
|---|---|---|---|
Missing declaration | A TSD, KMD, or annual report you should have filed hasn’t arrived | Yes - the original filing deadline has already passed | File it immediately, or reply explaining the delay |
KMD / KMD INF mismatch | EMTA’s automatic cross-check of your VAT return against invoice-level detail doesn’t reconcile | Usually, as stated in the letter | Reconcile the original invoices with your accountant |
Payroll or VAT query | EMTA is asking about one specific transaction, benefit, or classification | As stated in the letter | Pull the exact document the letter names, nothing more |
Arrears notice | Your prepayment account shows an unpaid balance past its due date | Yes - interest is already accruing | Check the balance in e-MTA, then pay or query it |
Routine information request | EMTA wants a supporting document for something already filed | As stated in the letter | Send exactly what’s asked, by the date given |
A missing declaration notice
A missing declaration notice means EMTA’s system expected a filing from your company by a specific date and didn’t receive it. TSD (payroll and withholding) is due by the 10th of the following month, and KMD (the VAT return) by the 20th - both only apply if your company made a taxable payment or is VAT-registered that month. If your company has no payroll and isn’t VAT-registered, the one filing it can never skip is the annual report, due within six months of the financial year’s end - 30 June for a calendar-year company. A missing declaration notice for any of these is anchored to a deadline that has already passed, so treat it as urgent no matter how the letter itself is worded. File the missing return immediately if you can, or reply explaining the delay before doing anything else. If the missing filing is specifically the annual report, the consequences run differently from a missed KMD or TSD - see what happens after a missed annual report deadline.
A mismatch between your KMD and KMD INF
A KMD/KMD INF mismatch notice means EMTA’s automatic cross-check found a gap between the totals on your VAT return and the invoice-level detail reported alongside it. The KMD is your monthly VAT return; the KMD INF annex lists individual invoices once your total business with a single counterparty in that period reaches €1,000 excluding VAT. Because both are filed together and EMTA reconciles them automatically, a rounding error, a missed invoice, or a counterparty reporting the same transaction differently is enough to trigger a query. This is one of the more mechanical categories to resolve: the fix is almost always to pull the original invoices and reconcile them line by line against what was filed, not to argue with the letter’s premise. Bring your accountant in immediately - this kind of detail-level reconciliation is exactly what they’re set up to do faster than you can alone. If you’re still working out how VAT registration and filings fit together after incorporation, see how VAT works after you incorporate.
A payroll or VAT query
A payroll or VAT query asks you to explain or document one specific transaction - a salary payment, a fringe benefit, a reclassified expense, or the VAT treatment on a particular invoice. These are narrower than they sound: EMTA is usually checking a single line item, not opening a full review of your company’s accounts. The letter names the return, the period, and the item in question, so read that detail first - it tells you exactly which document to pull rather than sending your entire accounting file in response. If the query concerns something like a fringe benefit (reported on TSD annex 4) or an expense unrelated to business (annex 6), your accountant will already know which annex and which month it touched, because they filed it. Reply with only what’s asked - over-explaining or attaching unrelated documents tends to generate a second, longer letter rather than closing the first one cleanly.
An arrears notice
An arrears notice means your company’s prepayment account (ettemaksukonto) - the single account EMTA uses to track everything you owe across all tax types - shows an unpaid balance past its due date. This is the one category where a deadline exists whether or not the letter mentions one: late-payment interest accrues at 0.06% a day, roughly 21.9% a year, from the original due date until the balance clears. Overdue amounts are swept from the account automatically several times a day, oldest debt first, so a partial payment gets applied in an order you don’t control. Log into e-MTA yourself and check the actual current balance - a letter can lag behind a payment that already cleared. If the balance is real, pay it or contact EMTA about a payment arrangement before interest keeps compounding. If you believe the notice is wrong, say so through e-MTA with evidence attached, rather than simply not paying and hoping it resolves itself.
A routine information request
A routine information request is the least alarming of the five categories: EMTA wants a supporting document for something you already filed, not evidence that something is wrong. It might ask for the invoice behind a specific KMD line, proof of a bank transfer, or the contract behind a declared expense. These requests are common precisely because they’re cheap for EMTA to send and cheap for you to answer - one scanned invoice or bank statement usually closes the matter for good. Treat the request literally: send exactly what’s asked, in the format asked, by the date given, and stop there. Sending your whole accounting archive instead of the single document requested slows the process down and invites further questions you didn’t need. If you can’t lay hands on the document immediately, reply within the deadline anyway and say when you’ll have it - going silent is worse than a short, explained delay.
Which letters carry a hard deadline - and which don’t
Two of the five categories are tied to a deadline that already exists in law, independent of anything the letter says: a missing declaration notice, because the original TSD, KMD, or annual report deadline has already passed, and an arrears notice, because interest is accruing from the original due date regardless of when EMTA writes to you. The other three - a KMD/KMD INF mismatch, a payroll or VAT query, and a routine information request - carry a response deadline that EMTA sets case by case and states in the letter itself. That date is not fixed by statute the way filing deadlines are, so don’t guess it and don’t assume a pattern from a different letter applies to yours. Read the deadline printed in your specific letter and treat that as the real one; if the wording is unclear, ask your accountant to check e-MTA directly rather than estimating.
Consider a founder who sees the e-MTA notification email late on a Friday, assumes the worst, and calls EMTA’s general line before reading past the first paragraph. The officer can’t discuss specifics without the reference number printed at the top of the letter. Reading the whole page first would have answered most of what she wanted to ask.
What to do in the first 24 hours
The first 24 hours after an EMTA letter arrives decide how smoothly the rest of the process goes. Work through these steps in order, and resist the urge to reply before you’ve done them:
Read the entire letter once before reacting - note the exact date, the case or reference number, and which tax type it concerns.
Log into e-MTA yourself and check the underlying return or account balance the letter refers to.
Forward the complete letter, not a summary or a screenshot, to your accountant. If the query touches a specific period, include the standard documents they’d need for that month.
Confirm internally what actually happened for the period in question, before drafting any reply at all.
Reply through e-MTA, by the stated deadline, with exactly what’s asked - not more, not less.
What not to do
A handful of instinctive reactions make an EMTA letter worse than it needs to be. Avoid all of these:
Don’t ignore the letter - an unopened e-MTA message is still treated as delivered (more on that below), and inaction doesn’t pause anything.
Don’t answer from memory - check the actual filed return or invoice before you state anything to EMTA as fact.
Don’t send documents your accountant hasn’t reviewed - a rushed, wrong answer generates a second letter and looks worse than a short, honest delay.
Don’t assume every letter is a penalty - most of the five categories are administrative checks, not punitive action.
Don’t call EMTA and make verbal commitments to a deadline or an amount you haven’t verified in e-MTA first.
How e-MTA correspondence actually works
All formal EMTA communication with your company happens through e-MTA, the tax board’s self-service portal, accessed with an ID-card, Mobile-ID, Smart-ID, or your e-Residency digital ID. When EMTA places a new document in your e-MTA inbox, it sends a notification to the email address on file in the commercial register or previously given to EMTA - it does not email you the letter’s content directly, only a heads-up that something is waiting. If nobody opens the document within five working days of it appearing in e-MTA, EMTA posts a paper copy to the company’s registered legal address on file. That means an unread portal message still counts as delivered on EMTA’s own clock; not opening it doesn’t buy you extra time, it only delays when you personally find out. Keep the registered email address current, check e-MTA on a regular cadence, or give your accountant access so nothing sits unread for five working days unattended.
When to involve your accountant - and when you can reply yourself
A routine information request for a single document you can locate in minutes is often fine to answer yourself, as long as you send exactly what’s asked and nothing more. Everything else - a missing declaration, a KMD/KMD INF mismatch, a payroll or VAT query, or an arrears notice - benefits from your accountant reading it before you reply, because each one touches a filed return or a classification they already track for your company. Estonian tax replies are formal and specific: the wrong wording in a self-drafted reply can turn a five-minute clarification into a longer back-and-forth that takes weeks to close. If nobody currently reviews your filings before they go in, an EMTA letter is a useful prompt to fix that going forward, not just to close out this one letter.
Frequently asked questions
What does it mean if my Estonian company gets a letter from EMTA?
It almost always falls into one of five categories: a missing declaration, a KMD/KMD INF mismatch, a payroll or VAT query, an arrears notice, or a routine information request. None of these automatically means a fine - most start as an automated check inside EMTA’s own systems, not a manual decision to investigate your company specifically.
Does every letter from the tax board mean I’m being fined?
No. Most EMTA letters are administrative: a request for one document, a query about a single transaction, or a notice that something wasn’t filed on time. Only an arrears notice concerns money you already owe, and even that is interest on an unpaid balance building up, not a penalty imposed by default.
How do I know if my EMTA letter has a hard deadline?
A missing declaration notice and an arrears notice are tied to deadlines that already exist in Estonian tax law, so treat both as urgent immediately, regardless of the letter’s own wording. For any other category, the response deadline is set case by case and stated in the letter itself - read it there rather than assuming a date from a different letter applies.
What is a mismatch between KMD and KMD INF?
The KMD is your monthly VAT return; the KMD INF annex lists individual invoices once your business with one counterparty in a period reaches €1,000 excluding VAT. A mismatch notice means EMTA’s automatic cross-check found the two don’t reconcile - usually a missed invoice, a rounding difference, or a counterparty reporting the same deal differently.
What happens if I don’t open a message in e-MTA?
If nobody opens a new document in e-MTA within five working days, EMTA sends a paper copy to your company’s registered legal address on file. Either way, the message is treated as delivered on EMTA’s own clock from the moment it was placed in e-MTA, so leaving it unopened doesn’t extend any deadline.
Can I reply to EMTA myself, or do I need an accountant?
A simple, single-document information request is usually fine to answer yourself, as long as you send exactly what’s asked. A missing declaration, a KMD/KMD INF mismatch, a payroll or VAT query, or an arrears notice all touch a filed return or a classification, so it’s worth having your accountant read the letter before you send anything back.
What if I disagree with an arrears notice?
Check your prepayment account balance in e-MTA first - a letter can lag behind a payment that has already cleared. If you still disagree once you’ve checked, respond through e-MTA with evidence attached rather than ignoring the notice; interest keeps accruing on an unpaid balance whether or not you agree with it.
Is a routine information request the same as a tax audit?
No. A routine information request usually asks for one supporting document behind something you already filed, and closes once you send it. A full audit is broader, longer, and would say so explicitly in the letter - most EMTA correspondence with a small company never reaches that stage.
What should I never do when my Estonian company gets a letter from EMTA?
Never ignore it, never answer from memory instead of checking the actual filing, and never send documents your accountant hasn’t reviewed first. Reading the whole letter and forwarding it intact to your accountant within the first day resolves nearly every case on this list without any drama.
