Retirement planning often comes down to tax timing, and one of the most powerful moves for savers approaching retirement is converting a traditional IRA into a Roth IRA. While Roth conversions can help reduce taxes on future withdrawals, doing the trade at the wrong time—or structuring it poorly—can substantially raise the tax bill when it matters most.
The account rules matter: Roth IRAs generally allow tax-free qualified distributions, but conversions from traditional IRAs are typically taxed as ordinary income in the year they occur. That combination makes conversion decisions—timing, tax payments, and even Medicare enrollment—key considerations for pre-retirees.
Key takeaways
- Price move: No market price movement was reported; this is a tax-planning review for pre-retirees considering IRA-to-Roth conversions.
- Catalyst: The central trigger is the tax treatment of Roth conversions—taxes are due in the conversion year as ordinary income.
- Key implication: Converting during peak earning years, paying taxes the wrong way, or delaying until Medicare impacts premiums can all increase long-term costs.
- Action point: Plan conversions across lower-income years, manage how the tax bill is paid, and coordinate timing with Medicare enrollment to reduce avoidable expenses.
What IRA-to-Roth conversions change
A traditional IRA can offer a tax deduction depending on the filer’s situation, reducing taxable income in the year contributions are made. In contrast, a Roth IRA provides no deduction at deposit, but the Roth structure aims to make future growth and qualified withdrawals tax-free.
While contribution limits apply across IRAs, and distributions are generally available after age 59½, the conversion itself is governed by a different rule: government allows traditional IRA owners to convert to a Roth IRA at any time and there is no annual cap on the amount converted. The cost comes immediately—conversions are taxed at ordinary income rates in the calendar year the conversion occurs.
Common conversion mistakes to avoid
Converting during high-earning years
One frequent error is converting when income is highest. For many households, peak earnings can fall in the 40s and 50s, which often corresponds to higher progressive tax brackets. Because conversion income is treated as ordinary income, large conversions during high-income years can push part of the conversion into higher marginal rates.
Instead, the strategy discussed is to wait until lower-earning years when possible and, where appropriate, spread conversions across multiple years to reduce the annual tax burden. This approach can help keep the conversion taxable income from surging into higher brackets all at once.
Making improper decisions on tax payment timing
Another pitfall involves how conversion taxes are handled. When converting, an investor can typically choose between paying taxes later through their regular tax filing or having the brokerage cover taxes using part of the distribution.
The article argues that in most scenarios, paying the tax bill later can increase the amount that remains in the Roth IRA and continues compounding tax-free. It provides a simplified example: converting $100,000 to a Roth IRA and paying the associated taxes at filing time would preserve the full $100,000 in the Roth, while a scenario where the brokerage remits taxes at an estimated 20% rate would leave only $80,000 to grow.
Over time, that difference can compound materially. With an assumed 10% annual return over 20 years, the article estimates the $100,000 would grow to $673,000, versus $532,000 for the $80,000 alternative—an outcome driven by the earlier reduction in Roth assets.
Forgetting how Medicare premiums can be affected
Pre-retirees also need to account for Medicare premium dynamics. Medicare premiums can depend on income, and the article notes that premiums are based on income from two years prior to enrollment. That lag creates a planning window.
According to the article, investors should aim to complete IRA-to-Roth conversions before starting to take Medicare, because a large conversion at an older age can raise the Medicare premium burden later. It suggests that if feasible, converting regular IRA funds before age 63 may reduce the chance of a sharp premium increase tied to enrollment years.
The practical takeaway is that Roth conversion planning should not focus only on federal income taxes; it also needs to consider the Medicare premium calculation that uses prior-year income.
What to watch next
Before converting, investors should review their expected income trajectory, understand the tax bracket implications of the conversion amount in the specific year it occurs, and consider how the choice to pay taxes out-of-pocket versus from the brokerage distribution affects the Roth balance that remains invested. They should also coordinate conversion schedules with Medicare enrollment timing to avoid unintended increases in premiums based on prior-year income. If additional tax moves are planned, the next step is to align them with upcoming IRS filing timelines and personal income expectations rather than treating conversions as a one-time decision.
