Converting to a Roth After a Market Drop in 2026: The Tax Is Based on the Day the Shares Move
If you own a traditional IRA and some of its holdings have fallen this fall, a Roth conversion now would be taxed on those lower values. The decision is permanent, and to count for 2026 it has to be completed by December 31, 2026.
The short answer: For 2026, a Roth IRA conversion adds the value of what you move to your federal and California taxable income in the year you convert. Moving shares after a decline means the same shares create less taxable income, and whatever they do afterward happens inside the Roth. Because a conversion made since 2018 can't be undone, the lower price only helps if the conversion already made sense for your tax picture.
How a Roth Conversion Is Taxed in 2026
Any untaxed money you move from a traditional IRA to a Roth IRA is taxable income in the year of the conversion, and it is reported on Form 8606. California taxes the same amount as ordinary income on your state return, at the same rates as wages.
You don't have to sell first. Most custodians can convert shares directly, and the taxable amount is their market value on the day they move. That is why the timing of a market drop matters: the tax is set by the price on conversion day, not by what you paid or what the shares were worth last month.
A rounded example, assuming one fund and no other changes: 1,000 shares worth $100 each in early October would have added $100,000 to taxable income if converted then. If the same shares are worth $80 in November, converting them adds $80,000. The number of shares in the Roth is the same either way.
Why a Lower Price Helps, and Where It Stops Helping
The benefit is narrow and real. You pay tax on the lower value, and any later growth on those shares builds inside the Roth, where qualified withdrawals are tax-free. A conversion doesn't depend on the shares recovering to make sense, but a lower starting value reduces what the conversion costs today.
The limit is that a conversion is final. Since January 1, 2018, a conversion from a traditional IRA to a Roth IRA cannot be recharacterized, so there is no way to reverse it if the shares fall further. The tax stays based on the conversion-day value. A price drop is a reason to look at the decision now, not a reason by itself to convert.
The bigger question is your tax bracket this year compared with the years ahead. Conversion income stacks on top of everything else you report for 2026, including wages, pension income, Social Security and realized capital gains. A conversion that pushes income into a higher bracket can cost more than the market drop saves.
What Else a Conversion Touches
Medicare premiums. Your 2026 income sets your 2028 Medicare Part B and Part D premiums through the income-related monthly adjustment amount, or IRMAA. A conversion that crosses a threshold raises those premiums for a full year.
Social Security taxes. Conversion income counts toward the income that decides how much of your Social Security benefit is taxable, up to 85%. A conversion can make more of this year's benefit taxable.
How you pay the tax. Paying the tax from money outside the IRA keeps the full converted amount in the Roth. Withholding tax from the conversion itself means less goes into the Roth, and if you are under 59½, the withheld amount may also face the 10% additional tax on early distributions.
The five-year clock. Each conversion starts its own five-year period. If you are under 59½ and withdraw converted money before that period ends, the 10% additional tax can apply.
Where It Fits in Your Plan
A Roth conversion is a multi-year decision made one year at a time. The Tax Management Journey® weighs this year's bracket against the ones that follow: the years before required minimum distributions begin at 73, or 75 for anyone born in 1960 or later; the Medicare premium tiers two years out; and the single-filer brackets a surviving spouse would face. It also accounts for California's tax separately from the federal return, since both apply to the same conversion.
Seen that way, this fall's price drop is one input. It lowers the cost of a conversion that the multi-year plan already supports. It doesn't create the case for one. If you have an advisor, the questions to bring before December 31 are how much room you have in your current bracket and which holdings would move.
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