Roth Conversion in a Bear Market: Why a Down Market Is Often the Best Time to Convert

Most pre-retirees instinctively slow down when markets fall — but for Roth conversions, the math runs the other way. When your traditional IRA drops 25%, converting the same number of shares costs 25% less in income tax. The recovery — which happens anyway — now occurs entirely inside Roth, tax-free. Understanding this dynamic can turn a bear market from a source of anxiety into one of the most tax-efficient windows of your retirement.

The core insight: you pay tax on current value, not future recovery

When you convert a traditional IRA to Roth, the IRS taxes the current market value of the converted assets as ordinary income. That's it. What those assets do after conversion — recover, compound, pay dividends — happens inside Roth and generates no further income tax.

This means the same position converted at two different market prices results in two very different tax bills:

• Convert 4,000 shares at $50/share = $200,000 taxable income
• Convert 4,000 shares at $35/share = $140,000 taxable income

If the shares recover to $50 in either case, the Roth account ends up at $200,000. But in the second scenario, you paid income tax on $60,000 less — saving roughly $13,200 at the 22% rate. Same economic position. Substantially lower tax cost.

This is not a loophole or a strategy that requires special planning. It follows directly from how conversion taxation works: you pay on what it's worth now, and everything above that is yours tax-free forever.

Worked example: Tom and Rachel

Tom and Rachel are both 67, married filing jointly, recently retired. Their traditional IRA stands at $1.8M, invested primarily in broad stock index funds. They have no pension, have deferred Social Security to 70, and plan annual bracket-filling conversions through age 72.

Their annual conversion target, filling the 22% bracket:

• 22% bracket ceiling (2026, taxable income, MFJ): $201,050¹
• Standard deduction (MFJ, both 65+): $35,500
• Other income this year: $0 (no pension, no SS, no part-time work)
• Maximum conversion at 22%: $201,050 − $0 = $201,050 of taxable income, offset by standard deduction → MAGI ceiling ≈ $236,550, but they stay below IRMAA Tier 2 ($218,000) by converting $182,500 of MAGI

For simplicity, their target is $140,000 per year — comfortably inside the 22% bracket, below IRMAA Tier 1, and manageable from their outside savings.

Before the market decline

The IRA is at $1.8M. Their S&P 500 index fund holds shares at $50/share. Converting $140,000 means liquidating 2,800 shares and moving them to Roth. Federal income tax: roughly $140,000 × 22% = $30,800.

After a 30% market decline

The same index fund now trades at $35/share. Their IRA is now worth $1.26M — but the annual conversion opportunity is unchanged. They can still convert $140,000 of income. At $35/share, that $140,000 buys 4,000 shares in Roth instead of 2,800 shares. Same tax bill: $30,800. But 43% more shares converted.

When the market recovers to $50/share, those 4,000 shares are worth $200,000 — all of it tax-free inside Roth. Had they converted the same $140,000 worth before the drop (only 2,800 shares), the recovered value would be $140,000. The bear-market conversion produced an extra $60,000 of tax-free Roth wealth for identical out-of-pocket cost.

What you're NOT doing: dispelling the "locking in losses" fear

The most common objection to converting during a decline is: "I don't want to lock in my losses." This reflects a misunderstanding of what conversion does.

When you convert IRA shares to a Roth IRA, you do not sell those shares and buy them back. The actual shares move from your traditional IRA custodian account to your Roth IRA custodian account — in-kind. You still own the same shares. Nothing is sold, and no capital gain or loss is realized in the process.

The only thing that happens on the tax return is that the current value of what moved is added to your ordinary income. The shares themselves continue to sit in your account, now in Roth. If they recover, they recover in Roth — fully tax-free. If they decline further, they decline in Roth — but you would have faced the same decline in the traditional IRA, and at least the eventual recovery will be tax-free.

There are no realized losses and no behavioral trap to avoid — only the common intuitive misread that converting is the same as selling. It is not.

IRMAA interaction: down markets can expand your effective conversion ceiling

IRMAA surcharges are based on MAGI thresholds, not share counts or portfolio value. The 2026 IRMAA Tier 1 threshold is $218,000 MAGI for married filing jointly.² If your conversion amount is limited by IRMAA — i.e., you've been stopping at $215,000 MAGI to stay under Tier 1 — a market decline does not change that ceiling.

But it does change how many shares that ceiling lets you convert. If your target MAGI is $215,000 and each share was worth $50, you could convert 4,300 shares. After a 30% decline to $35/share, $215,000 buys 6,143 shares inside Roth. Same IRMAA position. Substantially more shares converted.

For retirees with large IRAs whose conversion plan has always been constrained by IRMAA ceilings, a bear market is the moment when those ceilings effectively allow them to transfer the most economic value into Roth for the lowest tax cost.

Combining with tax-loss harvesting in taxable accounts

Bear markets create two simultaneous opportunities for tax-efficient planning: Roth conversions from the IRA side, and tax-loss harvesting from the taxable account side. These can be executed in the same year without conflict.

In a taxable brokerage account, you can sell a position at a loss, harvest that loss to offset other gains (or up to $3,000 of ordinary income), and reinvest in a similar (but not substantially identical) fund to maintain market exposure. Simultaneously, you convert a portion of your traditional IRA to Roth at depressed share prices.

The two moves compound each other: the harvested losses reduce your taxable income (or offset gains), making more room within the same bracket for the Roth conversion. And the conversion accelerates the tax-free compounding of shares that are now cheap. A fee-only advisor with access to your full financial picture — taxable and tax-deferred together — is the right person to model whether both moves make sense in the same year, and in what order.

When NOT to increase conversions during a market decline

The bear market conversion opportunity is real, but it is not unconditional. Four situations where you should be cautious about increasing conversion amounts:

1. You'd have to pay taxes from the IRA itself. Withholding from the IRA to pay conversion taxes is almost always a mistake — it reduces the principal that goes into Roth and creates a smaller tax-free pool. Bear-market conversions only work as described when you can pay the tax from outside assets. If your outside cash is depleted and you'd need the IRA to cover the tax bill, a large conversion in a down market compounds the withdrawal at the worst time.
2. You have significant liquidity risk. If there's a real possibility you'd need to draw from the IRA for living expenses in the next 1-2 years, now is not the time to increase conversion size. Let the IRA be available and convert at your regular pace or less.
3. You're already past RMD age with high mandatory distributions. If you're 73+ and RMDs are already filling your bracket, there may be limited additional room to convert, regardless of market conditions. See the conversion-after-RMD guide for that situation.
4. Market timing risk cuts both ways. Converting more aggressively in a down market requires confidence that you are converting for the right tax reasons — not trying to "bottom-fish." If the market falls another 30% after your conversion, those shares are in Roth at a higher basis than they would be if you had waited. For most pre-retirees doing regular annual conversions, this is not a material concern — the long-run directional bet on recovery is reasonable. But if you are dramatically front-loading a year's conversion because of temporary market conditions, be aware that additional declines don't benefit you further.

A simple decision framework for down-market conversions

If you're in the golden window (ages 60–72) and already executing a Roth conversion plan, a market decline of 15%+ is worth evaluating with three questions:

1. Can I pay the tax bill from outside the IRA? If yes, proceed. If no, convert at your normal rate or less.
2. What is my current IRMAA ceiling? If the lower share prices allow you to convert more shares within the same MAGI ceiling, and you have outside funds for the tax, the case for increasing this year's conversion amount is strong.
3. Am I converting for tax reasons or market-timing reasons? If the answer is "I want to get more shares into Roth while prices are low, within my normal bracket targets," that is a tax reason. If the answer is "I think this is the bottom," that is market timing. The former is sound; the latter is speculation.

How to model the opportunity with your advisor

Quantifying the bear-market conversion opportunity requires projecting three things simultaneously: the tax cost of the conversion at current values, the IRMAA impact of any increase in conversion amount, and the recovery trajectory of the converted assets in Roth vs. the IRA. The lifetime NPV calculator can give you a directional estimate, but the precise sizing — especially when coordinating with capital gain harvesting, Social Security timing, and IRMAA lookback years — requires advisor-level modeling.

Fee-only advisors who specialize in Roth conversion strategy review this exact question every time the market has a significant drawdown: do we accelerate this year's conversion, hold steady, or reduce? The answer depends on your specific income, assets, IRMAA position, and outside liquidity — not on a generic rule. The match below connects you to advisors who run this analysis as a core part of their practice.