Base Estate Value Calculator for Forced Heirship | Factor In Lifetime Gifts for an Accurate Figure
Enter the estate value at death, a list of lifetime gifts (amount, timing, and recipient), and the debts, and this free simulator automatically calculates the base estate value for forced heirship under Article 1044 of Japan's Civil Code.
The starting point for a forced heirship claim is the "base estate value used to calculate the reserved portion," which isn't simply the estate at the time of death. Under Article 1044 of Japan's Civil Code, you need to add back certain lifetime gifts within a defined range and subtract debts. Just enter the estate value at death, a list of lifetime gifts, and the debts, and this tool automatically judges whether each gift should be added back and estimates the base estate value. The result can be used directly as an input for the forced heirship claim simulator.
Simulate from the estate at death, lifetime gifts, and debts
What the base estate for forced heirship is
Any claim for infringement of a forced share starts from the base estate — the figure against which the forced share is measured. It is not simply what remained at the moment of death. Article 1044 of the Japanese Civil Code requires certain lifetime gifts to be added back and the debts to be subtracted. Without that adjustment, anyone could hollow out the forced share simply by giving nearly everything away before dying.
What counts depends on who received the gift and when. Gifts to someone who is not an heir count only if made within one year of death, as a rule, while gifts to an heir that amount to an advancement count if made within ten years (gifts made where both parties knew they would harm the forced heirs are not limited by any period at all). Enter the list of gifts and this tool decides for each one whether it falls within scope, then produces the base estate. The result feeds straight into the forced share infringement calculator.
Sources used in this calculation
Statutory figures such as tax and insurance rates come from the public bodies listed below. They change when the law is revised, so please also check the primary source before relying on the result for an important decision.
- Statutory shares of inheritance and the share of a special beneficiary (Civil Code arts. 900, 903) — e-Gov Law Search (Digital Agency, Japan) Effective from 2019-07 ／ Last checked 2026-09-18
- The base estate for calculating the forced heirship claim and the apportionment of who bears the shortfall (Civil Code arts. 1044, 1047) — e-Gov Law Search (Digital Agency, Japan) Effective from 2019-07 ／ Last checked 2026-09-19
How to estimate the base estate
- Enter the assets at the date of death The total value of what remained when the deceased died.
- List the lifetime gifts Enter the amount, the date and the recipient — whether or not an heir — for each gift.
- Enter the debts The total of borrowings, unpaid bills and other liabilities the deceased owed.
- Check the ruling on each gift Scope is decided automatically from the recipient and the date, and shown together with the reason.
- Carry the base estate to the next tool The figure can be entered directly into the forced share infringement calculator.
Tips for getting more out of it
- Lifetime gifts to statutory heirs are counted over a longer 10-year window, but only if they were made for marriage, adoption, or as capital to support a livelihood (gifts that qualify as a special benefit). This differs from gifts to third parties, which count regardless of purpose but only within a 1-year window.
- For "years elapsed since the inheritance began," enter the number of years from the date the gift was made to the date the inheritance began. It's fine to round down any leftover months to an approximate whole number of years.
- Debts should include not just loans but also monetary obligations that were already fixed at the time the inheritance began, such as unpaid medical bills, taxes, and part of the funeral costs.
- If there are multiple lifetime gifts, use "+ Add a lifetime gift" to add more entry rows, and select individually for each gift whether the recipient was a statutory heir or a third party.
Where this helps
When a will seems unacceptable
Whether a forced share has been infringed cannot be judged at all until the base estate is settled.
Sorting out an estate with many lifetime gifts
Check gift by gift which ones are brought in and which fall outside the period.
Anticipating a claim against you
Even a recipient of a large share benefits from knowing the likely scale of what may be claimed.
Narrowing the issues before seeing a lawyer
Identifying the gifts likely to be contested makes better use of limited advisory time.
Forced heirship terms explained
- Forced share
- The minimum entitlement guaranteed to heirs other than siblings. A will cannot take it away.
- Base estate
- The foundation on which the forced share is computed: assets at death, plus gifts within scope, less debts.
- Advancement
- A lifetime gift or bequest to an heir that counts as an advance on their inheritance.
- Gifts within one year
- Gifts to someone who is not an heir are, as a rule, brought in only if made within a year of death.
- Gifts within ten years
- Gifts to an heir amounting to an advancement are brought in if made within ten years of death.
- Claim for infringement
- A demand that the shortfall against the forced share be paid in money. The 2019 reform made it a purely monetary claim.
Frequently Asked Questions
Side Note — The history behind how the counting rules for forced heirship came to be consolidated in "Article 1044"
Before Japan's Civil Code reform took effect in July 2019, case law (a Supreme Court decision of March 24, 1998) had taken the position that, regarding the range of lifetime gifts counted toward the base estate for forced heirship, gifts to statutory heirs should count with no time limit unless special circumstances existed. This meant that, compared with gifts to third parties, which were generally limited to within one year, gifts among heirs could reach back an extremely long time.
Allowing even very old gifts to be counted without limit undermined legal certainty for the heirs who had received them, creating a risk that disputes over gifts made decades earlier would be reopened. So the 2019 reform set a concrete cap of, in principle, 10 years for gifts to statutory heirs as well, making the rule more predictable.
On the other hand, gifts that "both parties knew would infringe the reserved portion" still carry no time limit even after the reform. This is because protecting deliberate gifts designed to circumvent the forced heirship system would undermine the effectiveness of the system itself. Today's Article 1044 rests on the balance between the clear 10-year and 1-year limits and this exceptional, unlimited counting rule.