In Estonia, filing your tax return takes "3 minutes" — that is the slogan on the government's official website, and in fact 98% of individual income tax returns are filed electronically. When you open the screen, your salary and deductions are already filled in; you just review and approve. Japan, meanwhile, has reached 77.1% e-Tax usage in the latest filing season. Japan files 23.53 million returns; Estonia is a "digital nation" of 1.37 million people. The real gap is not "whether you can file online" but "whether you type it yourself, or it is already written for you." We sort out the difference — and how to make your Japanese filing as fast as possible today — from primary sources.
How it works: open it, and it is already filled in
Estonians file individual income tax through e-MTA, the electronic portal of the Estonian Tax and Customs Board (EMTA). There are only three steps.
- Log in with an ID card, Smart-ID or Mobile-ID
- Review the pre-filled tax return
- If everything looks right, approve and submit (add or correct only if needed)
The key is step 2 — "pre-filling." By the time you log in, the following data is already there.
| Data already filled in | Where it comes from |
|---|---|
| Salary, wages and income tax already withheld | Employers file a per-employee declaration (TSD) by the 10th of the month after each payment |
| Pensions | Pension institutions |
| Rental income and interest already withheld at source | Reports from payers |
| Listed securities transactions | Nasdaq Baltic market |
| Deductions such as training costs and mortgage interest | Automatically linked from schools, banks and others |
- What you add yourself is only "money the government does not know about yet" — rental income not withheld at source, platform income, foreign income and the like
- Since 2015 there has even been "one-click filing": review the contents and submit as is
- The filing window runs from mid-February to April 30 each year (for 2025 income, it opened on February 16, 2026). Refunds to e-filers start on March 5 — refunds begin arriving barely two weeks after filing opens, a speed once introduced in European Commission material as "refunds in five days"
Why it exists: a re-independent state that could design from zero
When Estonia regained independence from the Soviet Union in 1991, it had to rebuild its public administration almost from scratch. A small country of about 1.37 million people, without the budget or staff to build a paper bureaucracy, chose to build digital from the start. Electronic tax filing (e-Tax) launched in 2000, and in 2001 the nationwide data exchange layer "X-Road" went live.
"Citizens never submit the same information to the government twice" (the once-only principle) — your address is held only by the population register, and the tax authority queries it via X-Road when needed. So the step of "copying" your address or salary onto a tax form simply does not exist.
- More than 50,000 public and private organizations and over 3,000 e-services are connected to X-Road, exchanging some 2.2 billion transactions a year. The official site says it "saves over 1,345 years of working time annually"
- Employers declare each employee's pay and withheld tax monthly, by the 10th of the following month (the TSD declaration). This monthly accumulation is what the pre-filled return at year-end actually is
- The X-Road platform has been exported to more than 20 countries and is partly used in Japan as well
The result: 98% e-filing — and the freedom not to file at all
- According to EMTA's official yearbook, 98% of individual income tax returns for 2024 (about 785,000 returns) were filed electronically; only 2% on paper. In EU statistics, Estonia's online filing rate for personal income tax was 97.4% — ten points above the EU average of 87.1% (2023)
- Income tax is a flat 22% since 2025. A law had been passed to raise it to 24% in 2026 for defense funding, but parliament repealed the increase in December 2025, keeping it at 22%. From 2026 the basic exemption is a uniform 700 euros per month (about 126,000 yen) regardless of income
- People whose tax has been correctly withheld at source, or whose income is below the basic exemption, have no obligation to file at all. The design is not "everyone works hard for 3 minutes" but "for many people, zero minutes"
- Incidentally, companies pay no corporate income tax as long as profits are retained and reinvested (tax applies when profits are distributed). Together with e-Residency, the digital residency program with over 140,000 registrants worldwide, the tax system itself is a national brand
Comparison with Japan: e-Tax has reached 77.1% — the remaining gap is pre-filling
Japan's e-Tax has also spread rapidly in recent years. According to the National Tax Agency, in the latest filing season (February–March 2026, for 2025 income), 77.1% of the 23.53 million filers — 18.14 million people — used e-Tax. 4.97 million filed from home by smartphone, and only 2.18 million visited a filing-assistance venue — for the first time, less than one in ten.
| Estonia (e-MTA) | Japan (e-Tax) | |
|---|---|---|
| E-filing rate | 98% (2024 returns) | 77.1% (2025 returns) |
| State of the return | Pre-filled (review and approve) | Self-entry in principle (partial auto-fill via Myna Portal link: 4.08 million users) |
| Time required | Official slogan: "3 minutes" (EC material: 3–5 minutes) | No official figure (varies greatly with how scattered your documents are) |
| Refunds | Start barely two weeks after filing opens (older EU material: "5 days") | About 3 weeks for e-Tax filings (paper: roughly 1–1.5 months) |
| Employer data reporting | Monthly, per employee (TSD) | Annual year-end adjustment plus statutory reports |
| How "no need to file" works | No obligation if withholding is correct | Year-end adjustment (47.21 million employees) settles taxes for most salaried workers |
An easily missed point: Japan already had its own automation first — the year-end adjustment, run through employers — and most of Japan's roughly 51 million salaried workers never file a return at all. Of the 23.53 million who do file, the majority (13.35 million) are refund claims to get money back via medical expense deductions or hometown tax donations. So Japan's challenge is not "digitize so everyone files," but how far the typing can be reduced for those who do file. The National Tax Agency's "Future Vision of Tax Administration 2023" officially targets a "Japanese-style pre-filled tax return" — expanding auto-filled items so filing is completed in a few clicks or taps — and a once-in-25-years core system replacement (KSK2) is scheduled for September 2026. The direction is the same as Estonia's. It is a difference of starting points — a nation of 1.37 million that could design from zero versus a country with 23.53 million filers — not a question of which country is superior.
What this means for you: getting closer to "3 minutes" in Japan today
In fact, the seed of "pre-filling" already exists in Japan's e-Tax: the Myna Portal link. Once set up, your withholding slip, medical expense notices, hometown tax donations, life insurance premiums, iDeCo contributions and more are auto-filled into the return. Usage reached 4.08 million people, up 31.7% year on year. Three tips to make the most of it:
- Finish the initial setup before filing season. The link setup is needed only the first time; afterwards it is mostly automatic. For your withholding slip, your employer must have submitted it to the tax office electronically, and you must have registered your wish to receive it via e-Tax
- Check whether your insurer and broker participate. Unlike Estonia, Japan's auto-fill works only if the issuing company has joined the link program. The National Tax Agency publishes a list of participating issuers
- Complete everything on your phone. Since September 2025, the "iPhone Individual Number Card" works with e-Tax, so you can file without scanning the physical card (Android's smartphone certificate has worked since January 2025). Note that the old ID-and-password method stopped accepting new registrations in October 2025
For the filing procedure itself, see our e-Tax filing guide and tax return checklist. Whether you are a sole proprietor or an employee filing for a refund, how much of the document-gathering you can automate makes the biggest difference in time.
What to do today
What to do today
- Log in to Myna Portal and set up the link with e-Tax, including registering to receive your withholding slip (it gets crowded right before filing season)
- Check the National Tax Agency's list to see whether your life insurer, broker and bank support the Myna Portal link
- Decide on one place to keep medical receipts and donation certificates for next year's return (items outside the link are entered from here)
FAQ
Q. Does filing in Estonia really take 3 minutes?
A. "3 minutes" is the figure on the Estonian government's official site (e-Estonia), and European Commission case material says "typically three to five minutes." It is the time for someone whose salary and deductions are already pre-filled and who only reviews and approves. If you have income to add, it takes somewhat longer.
Q. Will Japan get a pre-filled tax return too?
A. The National Tax Agency's "Future Vision of Tax Administration 2023" officially targets a "Japanese-style pre-filled tax return" — expanding auto-filled items so filing finishes in a few clicks or taps. Auto-fill of salary, medical expenses, hometown tax donations and more has already begun via the Myna Portal link, and the core system replacement (KSK2) is scheduled for September 2026.
Q. What does the Myna Portal link auto-fill?
A. Withholding slips for salary and public pensions, medical expense notices, donations including hometown tax, life and earthquake insurance premium certificates, national pension contributions, small-business mutual aid contributions including iDeCo, specific-account annual reports for securities, and mortgage-related documents. It works only when the issuing company participates, and medical expense notices cover insured care only (available from February 9 each year).
Q. Is Estonia a low-tax country?
A. Not simply. Personal income tax is a flat 22% (as of 2026) rather than progressive as in Japan, with a basic exemption of 700 euros per month — and employers separately pay a 33% social tax, so the burden structure differs greatly from Japan's. "Filing is fast" and "taxes are light" are different questions.
References (sources)
* Figures are based on materials published as of August 2026. Yen conversions use an approximate rate of 1 euro = 180 yen. Estonia's rules apply to residents of Estonia and do not affect the filing obligations of residents of Japan. This article is informational; for individual filing decisions, consult a tax office or tax accountant.