Stock market declines create a tax-saving opportunity for retirement savers willing to convert traditional IRA funds into Roth accounts.

When markets fall, your traditional IRA holdings are worth less. Converting to a Roth now means you pay income taxes on a smaller balance. After the conversion, any future growth inside the Roth account grows tax-free forever. You also avoid required minimum distributions in retirement that plague traditional IRAs.

Here's the math. Say you have a $100,000 traditional IRA that drops to $70,000 during a market downturn. You convert that $70,000 to a Roth. You owe income taxes only on $70,000, not the original $100,000. When the market recovers and that $70,000 grows back to $100,000 or higher within the Roth, all those gains escape taxation.

The strategy works best if you expect the converted funds to rebound. If you're converting stocks or index funds that historically recover, this math favors you. Converting bonds or stable value funds during a decline offers less benefit.

A critical catch exists. Your income limits matter. If your modified adjusted gross income (MAGI) exceeds thresholds set by the IRS, you cannot contribute directly to a Roth IRA. However, higher earners can still use the "backdoor Roth" method. This involves contributing to a traditional IRA, then immediately converting it to a Roth regardless of income.

The pro-rata rule complicates matters for people with existing traditional IRAs, SEP-IRAs, or SIMPLE IRAs. The IRS taxes conversions based on the percentage of pre-tax money across all your IRAs combined. Working with a tax professional before converting prevents costly mistakes.

You must complete conversions by December 31 to count them