Investors weighing a Roth conversion are running up against rules shaped by the 2017 Tax Cuts and Jobs Act and a 2025 deadline for many provisions to expire. The stakes are high for savers deciding whether to move traditional IRA or 401(k) money into a Roth account in the next two years. Lower tax brackets, the end of conversion do-overs, and new retirement timing rules are all in play.
“If you are eyeing a Roth conversion, there are key tax changes to consider under President Donald Trump’s ‘big beautiful bill.’ Here’s what you need to know.”
The law, passed in late 2017, cut individual tax rates and reshaped deductions. It also barred the popular tactic of reversing a Roth conversion after the fact. With several parts of the law set to sunset after 2025, many households are re-running the math on conversions in 2024 and 2025.
What Changed Under the 2017 Tax Law
The Tax Cuts and Jobs Act (TCJA) reduced marginal tax rates for many filers. It also capped the state and local tax deduction at $10,000 and nearly doubled the standard deduction. These changes affect the tax bill on a conversion, since the converted amount is taxed as ordinary income in the year of the move.
Before 2018, investors could “recharacterize” a conversion. That allowed a reversal if markets fell or the tax bill proved higher than expected. The TCJA removed that option for conversions made after 2017. Once converted, it is permanent.
Several individual tax provisions, including the lower brackets and the higher standard deduction, are scheduled to expire after 2025 unless Congress acts. If rates rise in 2026, conversions may cost more for many filers.
Why Timing Matters Through 2025
Converting during 2024 or 2025 can lock in today’s rates. For retirees who have not yet started Social Security or required minimum distributions (RMDs), those years may offer a window with lower taxable income. That can make conversions less expensive.
The SECURE Act raised the RMD start age from 70½ to 72, and the SECURE 2.0 law raised it to 73 for many, with a jump to 75 in 2033. Spreading conversions before RMDs begin can help manage future tax brackets and Medicare premium surcharges.
Roth accounts do not have RMDs during the owner’s lifetime. Starting in 2024, Roth 401(k)s also no longer require RMDs. That change improves the appeal of workplace Roth balances for long-term planning.
Key Rules Investors Should Watch
- Taxable income: Converted amounts add to income and can push a filer into a higher bracket.
- Medicare premiums: Higher income can trigger IRMAA surcharges two years later.
- Five-year rule: Each conversion has its own five-year clock before earnings can be withdrawn tax-free.
- Pro rata rule: Conversions from IRAs with pre-tax and after-tax money are taxed based on the pre-tax share across all IRAs.
- State taxes: States may tax conversions differently. Some have no income tax; others are fully taxed on their income.
Withholding can also trip investors. Using converted funds to pay the tax counts as a distribution and may be subject to a 10% penalty if under age 59½. Many advisers suggest paying taxes from cash rather than from the IRA.
Who Might Benefit—and Who Might Wait
Households in lower brackets in 2024–2025 may gain from partial conversions, especially if they expect higher income later. Early retirees, business owners with variable income, and savers with large pre-tax balances are common candidates.
Those nearing a higher bracket or an IRMAA threshold may choose smaller “fill the bracket” conversions. That approach converts only up to the top of the current bracket. It can also help balance future taxes if a surviving spouse will file single, which often leads to higher rates on the same income.
Investors expecting lower rates in the future may decide to wait. If income drops after a career change, a business sale, or a move to a no-tax state, a later conversion could be cheaper.
Market Moves and Case Studies
Volatile markets can shift the calculus. Some investors convert after a market drop to move more shares for the same tax cost. Others convert in stages across several months or years to reduce timing risk.
Consider a couple filing jointly with a large traditional IRA who retired at 62. They might convert enough each year to stay within the 22% bracket, coordinate with Affordable Care Act subsidy limits before Medicare, and stop conversions once RMDs begin. Another case is a high earner planning early retirement at 55 who waits to convert until income falls at 58, lowering the tax hit.
What to Watch Next
The biggest variable is 2026. If Congress lets the TCJA individual provisions lapse, many filers will see higher marginal rates. That would raise the cost of conversions and could shift demand into 2024 and 2025.
Rules for inherited accounts also matter. Most non-spouse heirs now must empty inherited IRAs within 10 years under the SECURE Act. A Roth can ease that burden since withdrawals are tax-free if the account is qualified, though timing rules still apply.
Investors weighing a conversion should run multi-year projections. That means checking brackets, Medicare thresholds, capital gains timing, and state rules. Spreading conversions, rather than doing one large move, often helps manage tax shocks.
The bottom line: today’s lower rates, the end of do-overs, and RMD changes make timing crucial. With 2025 approaching, careful planning can cut lifetime taxes and add flexibility in retirement.
