Why Trump's tax megabill brings new wrinkles — and opportunities — for Roth IRA conversions

President Donald Trump’s recently enacted tax-and-spending legislation, otherwise known as the One Big Beautiful Bill Act, has reshaped the landscape for Roth IRA conversions.

While some of the pressure to convert before year-end has eased, the new law introduces additional complexity that advisors and clients must navigate, according to major financial news outlets.

Previously, there was pressure for many savers to complete Roth conversions before 2026, when lower tax rates were set to expire. However, the new law makes these rates “permanent” – at least through 2028 – giving clients more time to consider their options, according to the Wall Street Journal.

Still, the fundamental mechanics of Roth conversions remain unchanged: savers can move funds from traditional IRAs, which require taxable withdrawals, to Roth IRAs, which offer tax-free withdrawals and no required minimum distributions for the original owner .

“There are more moving parts than ever, and it’s hard to eyeball the right steps,” Ryan McKeown, an adviser with Wealth Enhancement Group in Minnesota, told the Journal.

The decision to convert hinges on whether the tax rate paid at conversion will be lower than the rate expected at withdrawal. But as WSJ notes, “all things considered” includes an array of factors such as future tax rates, potential legislative changes, and individual circumstances like state taxes and the impact on heirs.

Trump’s bill also introduces new, temporary tax breaks – deductions for older Americans, tipped workers, and those with overtime pay or car loan interest. These provisions, available from 2025 through 2028, can create more “room” for conversions before bumping clients into higher tax brackets, according to a separate CNBC report.

However, these breaks typically don’t lower adjusted gross income, which is the basis for calculating Medicare premiums, Social Security taxes, and the 3.8% net investment income surtax.

“Higher income from Roth conversions can impact eligibility [for certain tax breaks],” CNBC reports. For example, the additional $6,000 deduction for older Americans begins to phase out once modified AGI exceeds $75,000 for single filers or $150,000 for married couples filing jointly .

The interplay between Roth conversions and required minimum distributions is another key consideration. Large traditional IRA balances can force retirees into higher tax brackets when RMDs begin at age 73, potentially triggering additional levies such as the 3.8% surtax or increased Medicare premiums. For some, converting to a Roth may help manage these future tax liabilities.

Judy Brown, a planner at SC&H Group, told CNBC that the strategy is “looking at a lot of different pieces, and figuring out the optimal place for each client.” She added that it may still make sense to convert funds at 22% or 24% rates now – even if it means forgoing certain deductions – to avoid higher rates on large pre-tax withdrawals later .

Advisors should also consider the impact on heirs. If a spouse inherits a Roth account, it may reduce the so-called “widow’s penalty,” which can raise taxes on surviving spouses even as income drops, according to WSJ. For children inheriting IRAs, especially those in higher-tax states or in their peak earning years, a Roth conversion could lower the family’s overall tax burden.