Roth Conversion the Year You Sell Your Home

Weighing a Roth conversion in the year you sell your home turns on one fact: the taxable portion of the home gain and the conversion land on the same tax return, and the tax code totals them. The Section 121 exclusion often shields most of the gain, but any taxable excess stacks with your conversion income and can quietly raise your rate.

Last reviewed: August 2026 | Written and reviewed by Craig Wear, CFP®, founder of Q3 Advisors

Two big taxable events, one tax return: why the sale year and conversion year get taxed together

A home sale and a Roth conversion are separate taxable events, but the IRS totals them on a single Form 1040. The taxable gain above your Section 121 exclusion and the full conversion amount both flow into adjusted gross income for the same calendar year, and the combined figure drives your bracket, your Medicare surcharges, and your net investment income tax exposure. Sequencing the two matters.

Why is the home gain and the conversion added on the same return?

Your tax return does not separate income by source. The taxable portion of a home gain and the entire amount of a Roth conversion both land in adjusted gross income for the year each event occurs. A conversion is taxable ordinary income in the year it is completed, it is irreversible (recharacterization ended in 2018), and the deadline is December 31. When both happen in one year, they are measured, and taxed, together.

The three ways doing both in one year backfires (bracket spillover, IRMAA, NIIT)

Stacking a conversion onto a large taxable home gain can misfire in three ways. First, bracket spillover: ordinary conversion income consumes your 0% capital-gains room and pushes home gain into the 15% or 20% rate. Second, IRMAA: the combined income can cross a Medicare surcharge tier that raises premiums two years later. Third, the net investment income tax can add 3.8% once your modified adjusted gross income crosses the threshold.

When is doing both in the same year actually the right call?

Doing both in one year is not automatically a mistake. When most or all of the gain falls inside the Section 121 exclusion, the sale adds little or no taxable income, so ordinary-income room may still be open for a conversion. Households with modest other income and cash on hand to pay the tax from non-retirement funds sometimes find the year workable. The question is how much taxable gain survives the exclusion.

How the home gain and the Roth conversion actually stack

Home-sale capital gains and a Roth conversion interact through the tax stack. The Section 121 exclusion removes up to $250,000 (single) or $500,000 (married filing jointly) of gain first, so only the excess is taxable. Ordinary income, including the conversion, fills the brackets, and any leftover long-term gain stacks on top, where its 0%, 15%, or 20% rate depends on your total taxable income.

Section 121 first: is only the gain above $250k/$500k taxable?

Yes. Section 121 lets qualifying homeowners exclude up to $250,000 of primary-residence gain if single, or $500,000 if married filing jointly, provided the two-of-five-year ownership and use test is met. The excluded portion is not income at all: it does not count toward your brackets, IRMAA, or the net investment income tax. Only the gain above the exclusion becomes taxable. For many downsizers the exclusion absorbs the entire gain.

The stacking order that trips everyone up (ordinary income fills brackets, gains sit on top)

Long-term capital gains sit on top of the stack, not blended into it. Your ordinary income (wages, pension, interest, required distributions, and the conversion) fills the ordinary brackets first. The taxable home gain then stacks above that total, and the capital-gains rate depends on where the top of the stack lands. Because the conversion goes in underneath the gain, every dollar of conversion raises the floor the gain sits on.

Worked example: how a $12,400 conversion crowds out the 0% bracket

This table is illustrative, not a projection of any reader’s result. Consider a single 2026 filer with $12,400 of taxable ordinary income (including a $12,400 conversion) and $50,000 of taxable home gain above the exclusion. The 0% long-term capital-gains ceiling for a single filer is $49,450 of taxable income, so the conversion pushes part of the gain past that ceiling.

Without the conversion, nearly the entire $50,000 gain would have stayed in the 0% band. The $12,400 conversion pushed about $12,950 of that gain above the 0% ceiling and into the 15% rate, an indirect cost near $1,940 on the gain, on top of the ordinary tax on the conversion itself. Deciding how much to convert in such a year is where the planning lives.

What excluded gain does NOT count for, and what taxable gain does

The line is sharp. Excluded gain under Section 121 is invisible to the tax system: it does not fill the capital-gains brackets, does not raise MAGI for IRMAA, and is not net investment income. Taxable gain above the exclusion does all three. It occupies capital-gains bracket space, it counts toward the IRMAA tiers that set Medicare premiums, and it is subject to the 3.8% net investment income tax once thresholds are crossed.

Should I convert before or after selling the house?

Timing turns on how much gain your Section 121 exclusion actually covers. If the sale lands entirely inside the exclusion, ordinary-income room may remain for a conversion this year. If the gain runs well past the exclusion, many households defer the conversion, bank the proceeds, and convert across later low-income years, mindful that the sale year still sets Medicare premiums two years out.

If the sale blows past your exclusion (defer and stage)

When the taxable gain is large, adding conversion income the same year often stacks rate on top of rate. A common approach is to defer the conversion, hold the sale proceeds in a taxable account, and run conversions in later years when ordinary income is lower. Spreading the taxable income across several years, rather than concentrating it in one spike, is the logic behind a staged conversion plan.

If the sale lands inside the exclusion (room may remain)

When the gain falls entirely or mostly within the $250,000 or $500,000 exclusion, the sale may add little taxable income. In that case the ordinary-income room in the lower brackets can remain open, and a conversion sized to fill (but not overflow) a target bracket is one approach some retirees consider. The proceeds also provide cash to pay the resulting tax without touching the IRA.

The multi-year staging approach and cash reserve

Downsizers who want to convert without spiking a single year often set aside a cash reserve of roughly 12 to 24 months of living costs plus expected conversion taxes from the sale proceeds. That reserve funds spending in low-income years so conversions can run before required minimum distributions and Social Security begin, when the ordinary brackets are emptiest. Weighing the payoff usually involves a break-even analysis over the time horizon.

The two-year IRMAA lookback trap (and when one spike can cost less than spreading)

Medicare uses a two-year lookback for IRMAA, so income in the sale year does not hit premiums until two years later. A 2026 sale and conversion would set 2028 Medicare premiums. Because a one-time income spike triggers only a one-year surcharge that generally resets once income falls, concentrating both events in one year can cost less than spreading them across two years that each cross a tier. The arithmetic depends on the tiers.

The downsizer’s decision framework

Whether to convert in a home-sale year depends on the rest of your tax picture. Medicare enrollment, Social Security timing, and required minimum distributions each change the math. A frequent consideration is using taxable sale proceeds, rather than the IRA, to pay any conversion tax, which can keep more of the converted amount invested. Modeling the scenario before closing is common practice.

Decision checklist (Medicare, Social Security, RMDs, cash to pay tax)

Before converting in a home-sale year, several personal factors shape the math beyond the gain itself. Medicare enrollment, whether Social Security has started, whether required minimum distributions are already underway, and how much cash is on hand to pay the tax each pull the decision one way or the other. The questions below group what many households work through with an adviser before deciding.

• Are you enrolled in Medicare, so IRMAA tiers are in play two years out?
• Have you started Social Security, so more of the benefit could become taxable?
• Are you taking required minimum distributions? In an RMD year the RMD must come out first and cannot be converted (see the 2026 RMD rules).
• How much taxable gain survives the Section 121 exclusion?
• Do you have non-retirement cash to pay any conversion tax?

Should I pay the conversion tax from sale proceeds or the IRA?

Paying conversion tax from taxable sale proceeds, rather than from the pre-tax IRA, lets the full converted amount stay invested in the Roth, where future growth can be tax-free. Covering the tax with IRA dollars shrinks the balance that compounds tax-free and, before age 59 and a half, can add a 10% penalty. A downsizer often has convenient liquidity right after closing for this purpose.

State tax and NIIT modeling before you close vs. after

Two items reward modeling before the sale closes. First, state income tax: a move to a lower-tax or no-tax state can change whether a conversion is cheaper this year or next. Second, the net investment income tax: because the taxable home gain and the conversion both raise MAGI, running the numbers shows whether the combined figure crosses the $200,000 (single) or $250,000 (married filing jointly) threshold that exposes investment income to the extra 3.8%.

Bottom line by scenario (fully excluded / modestly over / far over)

How the year tends to play out follows how much taxable gain clears the Section 121 exclusion. A fully excluded sale, a gain modestly over the exclusion, and a gain far beyond it each point toward a different conversion approach. The summary below sketches the pattern many downsizers weigh for each of these three situations before deciding how much, if any, to convert.

• Gain fully excluded: the sale adds little taxable income, so ordinary-income room may still support a measured conversion, with proceeds available to pay the tax.
• Gain modestly over the exclusion: a smaller conversion, sized to avoid the next capital-gains or IRMAA tier, is one approach some households weigh.
• Gain far over the exclusion: deferring the conversion to later low-income years, funded by a cash reserve, is a frequent choice.

Quick-reference 2026 numbers

The figures below anchor the decision for the 2026 tax year. They are thresholds, not advice, and they change with inflation and legislation. The Section 121 exclusion and the capital-gains bracket edges most often decide whether a conversion in a home-sale year is efficient.

Frequently asked questions

Do I pay taxes on a Roth conversion the same year I sell my house?

Yes. A Roth conversion is taxable ordinary income in the year it is completed, and it is reported on the same return as your home sale. The Section 121 exclusion may shield most of the home gain, but the full conversion amount is taxed for that year and is totaled with any taxable gain above the exclusion when your bracket, IRMAA, and NIIT are figured.

Does selling your home affect your Medicare premiums (IRMAA)?

Only the taxable gain above your Section 121 exclusion affects IRMAA; the excluded gain is invisible to it. For 2026, IRMAA surcharges begin above $109,000 modified adjusted gross income (single) or $218,000 (joint), added to the $202.90 standard Part B premium. Because IRMAA uses a two-year lookback, a 2026 sale would raise premiums in 2028.

Does a home sale count as income for a Roth conversion?

Only the taxable portion does. Gain excluded under Section 121 (up to $250,000 single or $500,000 married filing jointly) is not income and does not raise your adjusted gross income. Gain above the exclusion is taxable income that stacks with your conversion, so it can influence which bracket the conversion fills and whether IRMAA and the net investment income tax apply.

Can capital gains from a home sale push my Roth conversion into a higher tax bracket?

Not directly. Long-term gains sit on top of the stack, so they do not raise the ordinary rate on the conversion beneath them. The common effect runs the other way: the conversion, as ordinary income, pushes the taxable home gain into a higher capital-gains rate. Both, however, raise MAGI, which can trigger IRMAA tiers and the 3.8% net investment income tax.

Should I do a Roth conversion before or after selling my house?

It depends on how much gain your exclusion covers. If the sale lands inside the Section 121 exclusion, ordinary-income room may remain for a conversion this year. If the taxable gain runs well past the exclusion, many households defer the conversion and stage it across later low-income years, since one large stacked year can raise the capital-gains rate, IRMAA, and NIIT together.

Is the home sale gain exclusion counted in MAGI?

No. Gain excluded under Section 121 is not part of adjusted gross income, so it is not counted in the modified adjusted gross income used for IRMAA or the net investment income tax. Only gain above the $250,000 or $500,000 exclusion enters MAGI. That distinction is why a fully excluded sale can leave conversion room that a partly taxable sale would not.

How much can I convert to a Roth without paying more tax?

A conversion is always taxable ordinary income, so there is no tax-free amount, but standard deductions and low brackets can soften the cost. For 2026 the standard deduction is $16,100 (single) and $32,200 (married filing jointly), plus an age-65 addition, shelters income first. Many investors size a conversion to fill a target bracket without spilling gains from the 0% band into 15%.

Does a Roth conversion affect the 0% capital gains rate?

Yes, dollar for dollar. Because ordinary income fills the tax stack before long-term gains, every $1 of Roth conversion income uses up $1 of your remaining 0% capital-gains room that year. For 2026 the 0% ceiling is $49,450 taxable income (single) and $98,900 (married filing jointly); once it is gone, home gain that would have been taxed at 0% is instead taxed at 15%.

How is a partial Section 121 exclusion prorated for a work or health move?

When the two-of-five-year ownership and use test is not fully met because of a qualifying work or health-related move, a partial exclusion may apply. It is prorated by the fraction of the 24-month period the test was satisfied: months of qualifying ownership and use divided by 24, multiplied by the $250,000 or $500,000 cap. A tax professional can confirm eligibility and the qualifying reason.

How does the OBBBA senior deduction interact in a home-sale year?

The One Big Beautiful Bill Act (P.L. 119-21) added a temporary senior deduction of up to $6,000 per person age 65 or older for tax years 2025 through 2028, subject to income phase-outs. In a home-sale year, a large taxable gain or conversion can raise income enough to phase the deduction down. Modeling the combined income before converting shows whether the deduction survives.