Updated July 31, 2026. Quick answer: a qualified disclaimer must be complete within 9 months of the death (IRC §2518) — in writing, delivered to the executor or account custodian, before accepting any benefit from the asset. There are no extensions, and the second condition kills more disclaimers than the deadline does: cash the dividend check, take a distribution, move into the house — and the right to disclaim that asset is gone regardless of the calendar.
Why anyone would refuse an inheritance
Because a qualified disclaimer is the only tool that redirects money after a death with no gift-tax consequence. The disclaimed asset passes as if you had died first — to the contingent beneficiary, the next heir under the will, or down the intestacy line. The classic uses: a wealthy child routing an inheritance directly to their own children (skipping a second future estate tax on it); a surviving spouse disclaiming into a credit-shelter arrangement the will provided for; an heir with creditor problems letting the asset bypass them entirely (state creditor law varies on this — verify locally before relying on it).
The mechanics that trip people
Partial disclaimers are allowed — you can disclaim specific assets, or a fraction, and keep the rest. A minor’s clock runs from age 21, not from the death. You cannot direct where it goes — the asset follows the documents, so read where it lands BEFORE disclaiming; a disclaimer that routes money to the wrong person is irrevocable too. For retirement accounts the interaction with beneficiary rules has its own wrinkles: disclaiming an inherited IRA. See every other clock: the deadlines calculator.
Nine months to make a six-figure routing decision.
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The number that surprises people who bought a long time ago
Downsizing is the one home sale where the gain is usually large and the exclusion usually still covers it. A couple who bought in 1994 for $180,000 and sell at $760,000 with $46,000 of selling costs have a realized gain of about $534,000 before improvements. That is above the $500,000 joint cap — but decades of capital improvements are exactly what brings it back under, and most sellers have never added them up.
Improvements are the lever, and the records are the constraint
A new roof, an addition, a replaced HVAC system, new windows, a finished basement: these add to basis. Repainting and repairs do not. Thirty years of improvements on a family home routinely total six figures, and every dollar of it reduces the gain dollar for dollar. The practical problem is documentary, not legal — the seller who kept receipts pays less than the identical seller who did not.
Why downsizers should check the net investment income tax separately
A retiree with modest ordinary income can still be pushed over the 3.8 percent NIIT threshold by the sale itself, because taxable gain is net investment income. The thresholds are $250,000 on a joint return and $200,000 otherwise, written into Section 1411(b) as fixed figures with no indexing. A sale that produces $120,000 of taxable gain on top of $180,000 of other income crosses the joint threshold and picks up 3.8 percent on the part above it.
The move itself may change the tax
Downsizing usually means moving, and sometimes across a state line. Some states tax the gain the federal exclusion just removed. If the sale and the move are in the same year, the order of the two matters, and it is worth checking the destination state before signing.
Related
Methodology
- Exclusion caps, the 2-of-5 test, the nonqualified-use allocation, the reduced-exclusion fraction and the depreciation carve-out are taken from the text of 26 U.S.C. 121. The 3.8 percent rate and its thresholds are from 26 U.S.C. 1411. Both were read on 2026-07-30.
- Section 121 caps and Section 1411 thresholds are written in the statute as fixed dollar amounts with no indexing mechanism, so they are built in. Long-term capital gain brackets ARE indexed annually, so your rate is an input rather than a lookup.
- Figures were computed by two independently written engines that agree to the cent, and the calculator on this page reproduces both exactly.
- Federal only. State treatment varies and some states do not follow the federal exclusion.
Educational estimate, not tax advice, and not a filed return. Federal only. Confirm anything that changes a filing decision with a CPA or tax attorney.
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