Updated July 31, 2026. Quick answer: a beneficiary change is free, unlimited and instant; the Roth rollover is capped, slow and one-way. Change the beneficiary when anyone in the family might use the money for education; roll to the Roth when the education mission is truly over. The wrong-order mistake is common: rolling $35k out over five years, then discovering a grandchild — the beneficiary change could have covered the grandchild AND restarted nothing, while the rollover dollars are gone from the education system forever.
What each door preserves
Beneficiary change preserves optionality: qualified family members include siblings, children, parents, first cousins — the money can hop generations, and with elections along the way, largely avoid transfer-tax friction for ordinary families. The rollover preserves compounding for one person: dollars land in the beneficiary’s Roth and become retirement money — better per-dollar for that beneficiary, worthless for everyone else. The hybrid most families actually want: keep the 529 alive through changes while education prospects exist, and use rollover years opportunistically when the beneficiary’s annual limit would otherwise go unused.
One warning on changes near year 15: the unresolved clock question means a casual beneficiary swap could jeopardize an account’s rollover eligibility under the conservative reading. Change beneficiaries freely on young accounts; think twice on seasoned ones.
Free and reversible beats capped and permanent – until it doesn’t.
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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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