Week 15 Day 2: The Roth Conversion Ladder

A Roth conversion moves money from a Traditional (pre-tax) account to a Roth (post-tax) account. You pay income tax on the converted amount in the year of conversion. But from that point forward, the money grows tax-free forever. Low-income years are the ideal time to convert.

The Roth conversion ladder is a powerful strategy for anyone with a gap between high-income working years and the start of Social Security or Required Minimum Distributions. Here is how it works. Retire (or take time off) at 50. Your income drops from $100,000 to near zero. Convert $50,000 from your Traditional IRA to Roth IRA. That $50,000 is taxed as income, but in the 12% bracket (instead of the 22-24% bracket during working years). You saved 10-12% on the tax. Do this every year during the gap, converting at low rates. By 65-70, you have moved a significant portion of your Traditional balance to Roth -- permanently eliminating future taxes on that money. Meanwhile, converted amounts are accessible penalty-free 5 years after conversion (the 5-year rule), creating a pipeline of accessible funds.

The optimal Roth conversion amount each year is determined by the marginal tax bracket structure. In 2024, the 12% bracket ends at $47,150 for single filers and $94,300 for married filing jointly. Converting up to these thresholds means paying only 10-12% in federal tax on the conversion -- significantly below the 22-32% most middle-to-high earners pay during working years. The analysis must also consider: (1) state income taxes on the conversion (varies by state; some states have no income tax), (2) the impact on ACA health insurance subsidies (conversions increase Modified AGI, potentially reducing or eliminating subsidies), (3) the 3.8% Net Investment Income Tax (NIIT) that applies above certain income thresholds, and (4) the pro-rata rule for conversions if you have both deductible and non-deductible Traditional IRA balances. Software tools like Boldin or the Roth conversion calculator at i-orp.com can model multi-year conversion plans that minimize lifetime tax burden across all accounts.