Tally up the expenses first, add the deductions, then work backwards so the tax comes out at "an amount I can afford to pay" — a tile craftsman filed returns that way for more than six years, understating his revenue by roughly 40%. The tax office answered with the heavy penalty tax (35–40%) and a seven-year reassessment. Yet Japan's National Tax Tribunal cancelled the heavy penalty, the reach shrank from seven years to five, and two full years of assessments disappeared. This instalment reads the October 2025 published ruling to find where the law actually draws the line called "fraudulent".
The case: two brothers laying tile
The elder of two tile-craftsman brothers billed their sole client under his own trade name, including his younger brother's work. The full amount was paid into a bank account in his wife's name that he managed, and he paid his brother in cash at a rate the two had agreed between themselves.
His filing method was remarkable: total the expenses, add the deductions, and set the revenue figure so that the resulting tax was an amount he could afford to pay. Reported revenue ran about 40% below reality; consumption tax was never filed at all.
After an audit, the tax office assessed the heavy penalty tax for concealment and reached back seven years on the ground of "deception or other wrongful acts". The brother contested it, and about a year later the Tribunal ruled.
Three issues, split decision
| Issue | Tax office | Tribunal |
|---|---|---|
| Whose revenue is it? | All the elder brother's | Tax office wins. All attributed to him |
| Heavy penalty tax (35–40%) | Concealment/fabrication | Taxpayer wins. Requirements not met — cancelled |
| 7-year reassessment | "Deception or other wrongful acts" | Taxpayer wins. Limited to 5 years; two oldest years fully cancelled |
Why the heavy penalty was cancelled
Under Article 68 of the General National Tax Act, the heavy penalty requires an act of concealment or fabrication separate from the under-reporting itself. Filing low on purpose is not enough — settled case law (Supreme Court, 28 April 1995) demands active workings, or at least "special conduct" from which the intent is outwardly visible.
Revenue was routed into a wife-name account
Disguising the name on a transaction distorts the facts — that is fabrication.
Nothing was hidden
On day one of the audit he volunteered that his sole client paid into the wife-name account — and he had been reporting that revenue (albeit understated). The account concealed nothing.
He knew the real figures and reverse-engineered "what he could pay" for six years
That sustained adjustment is the "special conduct".
That is merely intentional under-reporting
All of it shows intent to under-report — but none of it is an act of concealment or fabrication distinct from the under-reporting itself. "An amount I can pay" had no basis, no method, no machinery.
The line: forge books, destroy invoices, use fictitious names — heavy penalty. File low with no workings — ordinary penalties only, however deliberate. The same line as in instalment 1.
When the heavy penalty falls, seven years shrink to five
Reassessment normally reaches back five years; only "deception or other wrongful acts" extend it to seven (Article 70). The Tribunal applied the same logic — no workings, no wrongful act — so the extension collapsed, and the two oldest years were cancelled in full, principal tax included. The recent five years survived, with the heavy penalty replaced by ordinary penalties.
But he did not "win"
His main claim — that 36% of the revenue belonged to his brother — failed. The brothers each held contracts with the client and appeared separately on subcontractor rosters. The Tribunal looked past the paperwork: one consolidated invoice, one account under the elder brother's control, the brother paid at a discounted internal rate with no invoices or receipts, all pricing risk and tool costs on the elder brother. In substance the younger brother was his subcontractor, so all revenue was first the elder brother's — the substance-over-name rule of Article 12 of the Income Tax Act, the same structure as instalment 3.
And because he kept no books, his income was computed by estimated assessment (industry-ratio method), which the Tribunal upheld. No books means no factual rebuttal.
What to take away
| Common belief | Reality |
|---|---|
| "Deliberate under-reporting = heavy penalty" | Intent alone is not enough; a separate act of hiding (destroying records, forgery, fake names) is required |
| "The heavy penalty just raises the rate" | It travels with the 7-year rule. If the finding collapses, old years vanish, principal and all |
| "A word-of-mouth split with family is fine" | Attribution follows invoicing, accounts, risk and cost bearing. No written terms → all revenue may be attributed to one person |
| "Without books they can't compute my tax" | They estimate from industry ratios. Missing books only remove your defence |
For scale: only 17.9% of appeals to the Tribunal succeed in any part (FY2024, 693 cases). Here the five recent years of principal tax and ordinary penalties all stood.
FAQ
Q. Does deliberately under-reporting always trigger the heavy penalty tax?
A. No. The heavy penalty (35% for under-reporting, 40% for non-filing) requires an act of concealment or fabrication separate from the under-reporting itself. In this ruling, six-plus years of reverse-engineered returns were held to involve no such act; ordinary penalties and late-payment interest still applied.
Q. How far back can a Japanese tax audit reach?
A. Five years as a rule; seven only where "deception or other wrongful acts" are found — a test that tracks the heavy-penalty test. When the heavy penalty fell here, the two oldest years were cancelled entirely.
Q. Is routing business revenue through a family member's account concealment?
A. It can be, if the name is used to hide the revenue. Here it was not: the taxpayer disclosed the account on day one of the audit and had been reporting its revenue, so no concealment was found.
Q. When siblings or spouses work together, whose revenue is it?
A. Substance decides: who invoices, whose account receives payment, who bears price risk, who funds the tools. Without written terms and payment records, everything may be attributed to one person.
Q. What happens if I keep no books?
A. Your income can be estimated from comparable businesses' profit ratios, and you lose the ability to argue actual figures — as happened in this case.
Q. Can I contest a heavy penalty assessment?
A. Yes — a request for re-examination or an appeal to the National Tax Tribunal within three months, free of charge. The overall success rate is 17.9%, but element-by-element challenges like this one do succeed.
Sources
The case is a ruling anonymised and published by the National Tax Tribunal. Rulings are outside copyright under Article 13(iii) of the Copyright Act; the Tribunal's site follows the Public Data License (v1.0).
