InheritanceInheritance proceduresBasics

Filing Inheritance Tax: The First Three Things to Check

After a loved one passes away, you are pressed with many procedures amid grief. "Inheritance tax — where do I even begin?" To ease that worry, we lay out the first three things to check and the overall picture up to filing.

2026.06.02 updated 6 min read
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What you'll learn here
  • The inheritance-tax "deadline" and the overall schedule
  • How to identify the "assets" to check
  • Whether there is a "will", and how to confirm it
  • A rough guide to whether filing is required

01First, check the "deadlines"

Inheritance procedures have several deadlines. In particular, filing and paying inheritance tax is set at "within 10 months of the day after you learn the inheritance has begun", and missing it can incur additional and delinquency taxes.

ProcedureRough deadline
Renunciation / qualified acceptance of inheritanceWithin 3 months of learning the inheritance began
Quasi-final income-tax returnWithin 4 months of the day after learning it began
Filing and paying inheritance taxWithin 10 months of the day after learning it began
Caution
Ten months passes in a flash. Valuing assets and negotiating the estate division often take time, so it is important to grasp the overall picture early and, if needed, consult a specialist.

02Next, identify the "assets"

Inheritance tax covers all assets the deceased left behind. Grasp not only positive assets but also negative ones such as borrowings.

  • Real estate (land, buildings)
  • Deposits and cash
  • Securities (stocks, investment trusts, etc.)
  • Life-insurance proceeds and death retirement benefits
  • Cars, precious metals, artworks, etc.
  • Borrowings, unpaid bills, funeral costs (those that are deductible)
Key point
Easily overlooked are "nominal deposits" (in a family member's name but substantively the deceased's) and digital assets such as online brokerage accounts and crypto. Check accounts and contracts carefully from passbooks, mail and smartphone notifications.

03Then confirm whether there is a "will"

Whether or not there is a will greatly changes the subsequent procedures. A notarized will can be searched at a notary office; a handwritten will may be searchable via the Legal Affairs Bureau storage system.

If a handwritten will is found at home, then — except for those stored at the Legal Affairs Bureau — do not open it yourself; it requires "probate confirmation" by the family court.

04Is filing even required? — the basic-deduction idea

Inheritance tax has a "basic deduction", and if total assets are at or below this amount, in principle no inheritance tax applies and no filing is required. The basic deduction is calculated as follows.

ItemDetails
Basic deduction¥30 million + ¥6 million × number of legal heirs
Example: 3 heirs¥30 million + ¥6 million × 3 = ¥48 million
Caution
Even when "the tax becomes zero by using a special measure" — such as the small residential-land special or the spousal tax reduction — you must file to receive that special. "Zero tax" does not mean "no filing required".

Summary

When an inheritance arises, first check the three: "deadlines", "assets" and "a will".

The filing/payment deadline is 10 months. Because valuation and division take time, starting early is crucial.

Filing is required if you exceed the basic deduction or use a special measure. If unsure, consult a tax accountant early.

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This article is based on information available at the time of publication. Rules and systems may change. Please consult a professional before making any individual decisions.

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