Roth Conversion Strategies to Lower Your Tax Bill

A Roth conversion involves moving funds from a traditional IRA or 401(k) into a Roth IRA, paying taxes upfront to enjoy tax-free growth and withdrawals later. In 2026, this is essential because it allows retirees to fill lower tax brackets before mandatory distributions start, ultimately lowering their long-term tax bill and avoiding the tax torpedo effect on Social Security and Medicare premiums.

Why 2026 is the Critical Year for Roth Conversions

The retirement landscape is shifting, and the window for peak tax efficiency is narrowing. As we navigate the 2026 tax environment, investors must recognize that the historically low rates we have enjoyed for nearly a decade are reaching an expiration date. Legislative shifts mean that tax diversification is no longer a luxury for the wealthy; it is a necessity for anyone looking to protect their purchasing power in a high-debt national economy.

Current marginal tax rates are sitting at levels that many planners consider a gift. However, this gift is temporary. The scheduled sunset of the current tax regime threatens to return many taxpayers to higher tax brackets, where the 22% bracket could revert to 25% and the 24% bracket to 28%. By acting now, you can execute tax bracket management for conversions to move significant sums into Roth IRAs while the 24% threshold remains broad, particularly for married couples filing jointly. This proactive move essentially locks in today's rates, insulating your future self from the fiscal volatility of a government grappling with massive deficits.

Furthermore, the SECURE 2.0 Act has fundamentally changed the timing of retirement distributions. While it pushed the start of Required Minimum Distributions out to age 73 and eventually age 75, it also created a longer timeline for sophisticated Roth conversion strategies. The objective is to maximize the 24 percent tax bracket for Roth conversions while you still have control over your taxable income. Waiting until RMDs are forced upon you often results in a tax spike that can no longer be managed.

Maximizing the Trough Years (Ages 60-72)

The most effective Roth conversion strategies involve a deep understanding of what I call the trough years. This is the post-retirement income gap that occurs after you stop receiving a traditional salary but before you are required to take RMDs or start Social Security. During this phase, your taxable income often hits its lowest point in your adult life. If you do not utilize this lower income to convert assets, you are essentially wasting tax-efficient space in your current bracket.

Using a five-year Roth conversion ladder for retirement income allows you to smooth out your tax liability over time. Instead of converting a million dollars in one year and jumping into the highest tax bracket, you can spread the conversion over several years. This systematic approach ensures you are reducing future RMDs through strategic Roth conversions without triggering an unnecessary tax bill today. By controlling your taxable income now, you ensure that the growth on those assets remains yours, rather than being shared with the IRS through future mandatory distributions.

For those in their late 60s, Roth conversion strategies for ages 65 to 70 are particularly potent. This period allows you to evaluate your total wealth and decide how much you want to leave to heirs versus what you need for life. Moving assets during these years creates a shield. Because Roth IRAs do not have RMDs for the original owner, once the money is in the account, you have complete taxable income control over your lifestyle spending in later years.

Navigating the IRMAA Cliff and Surcharge Avoidance

One of the most common pitfalls of a poorly planned Roth conversion is the unintended impact on Medicare premiums. Many retirees are unaware of the Income-Related Monthly Adjustment Amount, or IRMAA. This is a surcharge added to your Medicare Part B and D premiums if your income exceeds certain thresholds. Because a conversion increases your modified adjusted gross income, it can inadvertently push you over a cliff, significantly raising your healthcare costs.

Crucially, Medicare uses a two-year lookback period. This means that any Roth conversion you execute in 2026 will determine the Medicare premiums you pay in 2028. Avoiding this surcharge requires precision and IRMAA surcharge avoidance strategies. For example, if you are a married couple filing jointly, you must be hyper-aware of the $218,000 threshold. Crossing that line by even one dollar can result in thousands of dollars in additional annual premiums.

Note: Thresholds are adjusted annually for inflation; 2026 specific brackets are projections based on 2024 benchmarks.

To stay below IRMAA thresholds during Roth conversion, you may need to limit the size of your conversion or time it with other tax-deductible expenses, such as charitable contributions. The goal is to maximize the amount converted while staying safely within your chosen IRMAA tier.

Technical Hurdles: Backdoor Roths and the Pro-Rata Rule

For high earners whose income exceeds the limits to contribute directly to a Roth IRA, backdoor Roth IRA planning remains a vital tool. This involves contributing to a non-deductible traditional IRA and then immediately converting those funds. However, this strategy is only simple if you do not have other pre-tax IRA assets. If you do, you must contend with the pro-rata rule.

The IRS views all of your traditional IRAs as one single entity for tax purposes. If you have $94,000 in a traditional rollover IRA and $6,000 in a new non-deductible contribution, the IRS considers any conversion to be 94% taxable. You cannot choose to only convert the $6,000 that was already taxed. This makes compliance and professional oversight essential to avoid a surprise tax bill.

Liquidity Check: Before proceeding with any large-scale Roth conversion, ensure you have the cash on hand in a non-retirement brokerage account to pay the resulting tax bill. Using the IRA funds themselves to pay the taxes is highly inefficient, as it reduces the amount of capital that can grow tax-free and may trigger early withdrawal penalties if you are under age 59½.

Legacy Planning: The SECURE Act 10-Year Rule

If your goal is to pass wealth to the next generation, a Roth conversion is arguably the most powerful legacy tool at your disposal. The SECURE Act effectively ended the stretch IRA for most non-spouse beneficiaries, replacing it with the 10-year rule. Heirs must now withdraw the entire balance of an inherited account within a decade.

If that inherited account is a traditional IRA, those disbursements are treated as ordinary income. For an heir in their peak earning years, receiving a large inheritance over just ten years can push them into the highest possible tax bracket, essentially handing a massive portion of the inheritance back to the government. Conversely, under the SECURE Act 10-year rule and Roth conversion benefits, a Roth beneficiary receives those funds entirely tax-free.

By paying the taxes now at your current (and likely lower) rates, you are providing your heirs with a tax-efficient legacy. They can leave the money in the Roth account to grow for the full ten years, maximizing the internal compounding, and then withdraw it without owing a cent to the IRS. In the context of wealth transfer efficiency, the Roth IRA is peerless.

FAQ

How much tax do you pay on a Roth conversion?

The amount of tax you pay is determined by your marginal tax rate. The amount converted is added to your other income for the year, and you pay ordinary income tax on the pre-tax portion of the conversion. It is vital to perform a tax projection before converting to see if the extra income pushes you into a higher bracket.

Is a Roth conversion worth it?

A Roth conversion is typically worth it if you expect your future tax rate to be the same as or higher than your current rate. It is also highly valuable for those looking to eliminate future RMDs, protect heirs from tax liabilities, or create a pool of tax-free assets to manage Medicare premium surcharges in later years.

What is the 5-year rule for Roth conversions?

There are actually two five-year rules. For conversions, the rule states that you must wait five years after each conversion before you can withdraw the converted principal penalty-free if you are under 59½. For earnings to be tax-free, the Roth account itself must have been open for at least five tax years, and you must be over 59½.

When is the best time to do a Roth conversion?

The best time is usually during a year when your income is lower than average, often referred to as a trough year. Additionally, many investors prefer to convert when the market is down, as you can move more shares of a fund for a lower tax cost, allowing the subsequent recovery to happen tax-free inside the Roth.

Do I have to pay taxes upfront on a Roth conversion?

Yes, the taxes on the converted amount are due when you file your tax return for the year of the conversion. You may also be required to make estimated tax payments to avoid underpayment penalties if the conversion significantly increases your tax liability.

Take Control of Your Retirement Tax Strategy

Navigating the complexities of a Roth conversion requires more than just an understanding of the 24 percent bracket; it requires a holistic look at your entire financial picture. From managing IRMAA surcharges to understanding state-level nuances—such as specific pension exclusions in states like New Jersey—every detail matters.

As we look toward the 2026 landscape, the urgency to move assets into tax-advantaged vehicles has never been higher. By making these moves now, you are not just potentially lowering your tax bill; you are securing your financial autonomy against future legislative changes. Consult with a tax professional to ensure your conversion ladder is built on a solid foundation of compliance and long-term planning.