A big one-year gain doesn't just get taxed — it triggers the 3.8% surtax now and can spike your Medicare premiums two years later. Both are driven by annual income, which means both can be managed by spreading the gain.
Most sellers focus on the capital gains rate and miss two expensive side effects of a one-year windfall: the 3.8% Net Investment Income Tax (NIIT) today, and a Medicare IRMAA surcharge two years from now. Both are triggered by income landing in a single year — so both can be softened the same way.
The NIIT adds 3.8% on investment income (including capital gains) once your modified AGI passes $200,000 single / $250,000 married. A large sale blows past those thresholds instantly, so nearly the whole gain carries the surtax — turning a "20%" sale into 23.8% federal before state tax.
Medicare Part B and Part D premiums are income-related and look back two years. A big gain this year can vault a retiree into the highest IRMAA tier for a future year — and it's a cliff, not a ramp: one dollar over a threshold applies the entire higher surcharge, for both spouses, for a full year. A one-time gain generally can't be appealed away.
The same income spike raises "provisional income," pushing up to 85% of your Social Security into taxable territory. Spreading the gain helps here too.
A lump-sum sale has a long, expensive shadow — the surtax now, Medicare later, and more of your Social Security taxed. A structured installment sale keeps any single year's income from tripping the cliffs.
Yes. Capital gains count as investment income, and a large sale typically pushes your modified AGI well past the $200,000 single / $250,000 married thresholds, so most of the gain carries the 3.8% Net Investment Income Tax.
Because the NIIT is based on annual modified AGI, spreading the gain over multiple years with a §453 structured installment sale can keep some years under the threshold and reduce the total surtax.
It can. Medicare IRMAA surcharges are based on your income from two years prior, so a large one-year gain can push you into a higher premium tier for a future year — for both spouses.
Typically about one year, because IRMAA is recalculated annually on a two-year lookback. A one-time gain generally cannot be appealed away, since IRMAA appeals are meant for life-changing events, not investment income.
Yes. A structured installment sale recognizes the gain across multiple years, keeping each year's modified AGI lower — which can keep you under IRMAA tiers, reduce NIIT exposure, and lower how much of your Social Security is taxed.
Before you sign anything, run your numbers with someone who structures the deal to be tax-smart and audit-ready from day one.
Call 213-414-2808 Run the Numbers →