Inheritance Tax Now Touches 1 in 10 Deaths in Japan — a Record 166,730 Estates in 2024

Japan's National Tax Agency has published its annual inheritance-tax results for 2024 (Reiwa 6), and they mark a threshold the country has never crossed: 10.4% of everyone who died in Japan left an estate big enough to owe inheritance tax — the first time the share has reached double digits since the modern system began. Of 1,605,378 deaths, heirs filed inheritance-tax returns on 166,730 estates (up 7.1% year on year), declaring a taxable value of ¥23.38 trillion and a record total tax of ¥3.24 trillion (about $21 billion).

What exactly did the NTA report?

The release, published in December 2025, counts returns filed by October 2025 for deaths in calendar 2024. Three records stand out. The number of taxable decedents — 166,730 — is the highest since the 2015 reform cut the basic deduction and pulled tens of thousands of ordinary families into the system; it has grown by more than 60,000 from that year's 103,043. The 10.4% taxation rate is up from 9.9% in 2023 and 9.6% in 2022 — a slow, relentless climb of roughly half a point a year. And the average estate owing tax was worth ¥140.25 million, with an average tax bill of ¥19.46 million (roughly $125,000) — an amount that routinely has to be found in cash, within ten months, by heirs who may never have seen the deceased's accounts.

The geography is a map of property prices. Nationwide the rate is 10.4%, but in the Tokyo regional jurisdiction it is 20.0% — one death in five — followed by Aichi at 16.2% and Kanagawa at 15.5%. Inside the capital's wards the numbers stop looking like a tax on the rich at all: Chiyoda 48.4%, and Shibuya, Setagaya, Bunkyo, Meguro and Suginami all above 30%. In central Tokyo, inheritance tax is now something close to a normal event.

Why is the taxable share climbing every year?

Two forces, moving in opposite directions, squeeze the same families from both sides. From below: the 2015 reform permanently lowered the threshold, so the net was cast wider and never pulled back in. From above: land and stock prices keep rising, pushing estates — above all Tokyo homes — over a line that does not move. The result is that the system designed to skim the wealthiest few percent now touches one in ten deaths nationwide and one in two in the capital's core, while the number of deaths itself sets a new record each year as the population ages.

Each of those 166,730 filings is a family running the same obstacle course: locate every account, security, property and debt; value them; agree a division; and pay a bill that averages eight figures in yen — all inside the ten-month filing deadline, and all depending on whether anyone can actually find the full picture of what their person owned.

What does a tax record have to do with being prepared?

Everything the tax office counts, a family must first *discover*. The inheritance-tax return is simply the moment the discovery problem becomes undeniable: you cannot value what you cannot find, you cannot divide what you cannot list, and you cannot pay the bill on an account nobody knew existed. Japan's parallel statistics trace the cost of that failure — the record 308,753 heirs who renounced their inheritance entirely in 2024, many after uncovering debts under a three-month legal clock, and the ¥169.4 billion in dormant deposits that flowed to the state fund the same fiscal year because no heir could map the accounts.

The families who settle smoothly are not richer. They are earlier: the inventory was made while the owner was alive — accounts, properties, policies, debts, the passwords that guard them — so the estate arrives as a list, not a search.

The map before the maze

Japan's tax authority can now tell you, to the person, how many estates crossed the line. What it cannot tell any family is where their own person's accounts actually are. That part is still handmade.

WiseEnding's My World is built for exactly this: a zero-knowledge vault where the inventory — assets, debts, documents, access instructions — is kept current while you are here, encrypted so only you can read it. And the Legacy Heartbeat is the mechanism that hands the map to the people you chose, automatically, if your silence ever becomes permanent. The tax office will find your estate. Make sure your family finds it first.

*Sources: Japan National Tax Agency, "Summary of Inheritance Tax Filings for Reiwa 6 (2024)" (published December 2025): 1,605,378 deaths; 166,730 estates with returns filed; 10.4% taxation rate; ¥23,384.6 billion total taxable value; ¥3,244.6 billion total tax; ¥140.25M average estate; ¥19.46M average tax; regional rates Tokyo 20.0%, Aichi 16.2%, Kanagawa 15.5%, Chiyoda ward 48.4%; Supreme Court of Japan inheritance-renunciation statistics 2024; Deposit Insurance Corporation of Japan dormant-deposits FY2024.*