Excess Advancement Reapportionment Calculator | Reallocate an Inheritance Fairly
When an heir's lifetime gifts or bequests exceed their rightful share (an "excess advancement heir"), free simulator that excludes them and reapportions the actual estate among the remaining heirs.
Under Japanese Civil Code Article 903(2), an heir whose advancement (lifetime gifts or bequests) equals or exceeds their rightful statutory share cannot receive their share (an "excess advancement heir"). The article says nothing about returning the excess; the accepted interpretation is that the heir does not have to return it. Our Advancement Clawback Calculator and Combined Advancement & Contribution Calculator simply clamp this excess to zero, without addressing how that leftover share should be redistributed to the other heirs. This tool excludes the excess advancement heir and reapportions the estate actually remaining (after deducting contribution amounts) among the other heirs, in proportion to what each of them would otherwise be entitled to.
Simulate from the estate value, heir composition, advancement, and contribution amounts
What apportioning an excess advancement means
An heir who has received a lifetime gift or a bequest has that value treated as an advance on their inheritance and deducted from their share — the doctrine of bringing advancements into account. Where what they received equals or exceeds their proper share, however, Article 903(2) of the Civil Code provides that they cannot receive their share. The article is silent on the excess, and the accepted interpretation is that they need not return it. Such an heir is described as an excess recipient.
The difficulty comes next. Setting an excess recipient's share to zero leaves the portion that could not be allocated hanging in the air, and how the remaining heirs divide it is the question of apportionment. This tool redistributes the estate that actually exists — the real assets after deducting contributions — among the heirs other than the excess recipient, in proportion to each one's original entitlement. Where the advancement calculator and the combined calculator simply clamp the excess to zero, this tool carries the reasoning through to the redistribution.
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
How to estimate the apportionment
- Enter the total value of the estate The combined value of the assets that actually exist at the start of the succession.
- Enter the composition of the heirs Specify how many of each there are among spouse, children and lineal ascendants (parents, etc.). The statutory shares follow from this.
- Enter each heir's advancement The value received as a lifetime gift or a bequest. Leave it at zero for heirs to whom it does not apply.
- Enter each heir's contribution The addition allowed where an heir made a special contribution to preserving or increasing the deceased's assets.
- Review the redistributed shares The tool identifies the excess recipient and shows the remaining heirs' shares after reapportionment.
Tips for getting more out of it
- When there is no excess advancement heir, this tool's results match those of the Combined Advancement & Contribution Calculator. The reapportionment logic unique to this tool only kicks in once an excess advancement heir appears.
- The amount being reapportioned is the actual remaining estate minus contribution amounts. Advancements are excluded from this pool because the recipient already holds that property.
- In the special case where every heir is an excess advancement heir, there is no baseline heir left for reapportionment, so the tool falls back to dividing the actual estate by the original statutory share ratios.
- If only advancement or only contribution applies, and there is no excess advancement heir, use the simpler single-purpose calculators instead.
- Whether an heir is an excess advancement heir is judged by whether their advancement exceeds their rightful share (statutory share times the notional estate), shown in the table in red with an "Excess" badge.
Where this helps
Dividing an estate where lifetime gifts were uneven
Where one child received substantial support, this shows in concrete figures what the other heirs end up with.
Preparing for the division conference
Sharing the calculation beforehand lets the discussion begin from figures rather than from feelings.
Checking the position before mediation
Because the reasoning approximates how a family court would approach it, this helps set expectations.
Organising matters before seeing a specialist
Knowing which points are likely to be contested makes better use of the time available.
Succession terms explained
- Advancement
- A lifetime gift or bequest received by an heir from the deceased that counts as an advance on the inheritance.
- Bringing into account
- Adding an advancement back to the estate and recalculating the shares, producing a deemed estate.
- Excess recipient
- An heir whose advancement exceeds their proper share. They need not return the excess, but they receive nothing further.
- Contribution
- The addition allowed to an heir who made a special contribution to preserving or increasing the deceased's assets, under Article 904-2.
- Actual share
- The share finally received, being the statutory share adjusted for advancements and contributions.
- Apportionment
- Dividing what remains among the heirs in proportion to each one's original entitlement.
Frequently Asked Questions
Side Note — What happens when someone already received too much?
Advancement (Civil Code Art. 903) adjusts an heir's share to account for lifetime gifts or bequests they already received, for fairness among heirs. But sometimes that gift is so large it exceeds the heir's entire rightful share. This is called an "excess advancement heir."
Article 903(2) provides that where the value of the bequest or gift equals or exceeds the value of the heir's share, that heir cannot receive their share. It says nothing about whether the excess must be returned, and the accepted interpretation is that it need not be. The heir keeps what they were given, but receives nothing further from the estate — their specific share becomes zero.
The remaining question is how to redistribute the portion that heir would otherwise have received. A common approach in practice is to exclude the excess advancement heir from the calculation entirely, then divide the estate that actually remains among the other heirs in proportion to what each of them would otherwise be entitled to. This method is relatively simple to explain and is widely used as a starting point in estate division discussions.
When there are multiple excess advancement heirs, or when excluding one heir causes another to become excess in turn, a more advanced multi-step calculation may be needed. In such cases, treat this tool's estimate as a starting point and ultimately defer to a lawyer or family court.