Federal employees and members of the uniformed services often hear about Roth conversions long before they understand how one might actually work inside their own retirement account. A Roth in-plan conversion TSP strategy refers to moving traditional (pre-tax) Thrift Savings Plan money into a Roth balance within the same plan, rather than rolling funds out to an IRA first. In 2026, more savers are asking whether this kind of move fits their long-term tax planning, especially as retirement dates approach and account balances grow. This checklist walks through the practical steps to think through before assuming an in-plan conversion is the right fit for your situation.

Before going further, one clarification matters: plan rules around in-plan Roth conversions can differ by employer-sponsored plan, and not every plan offers this feature in the same way. Some workplace retirement plans allow it, others restrict it to certain contribution sources, and rules can change over time. This checklist is meant to help you ask the right questions and organize your thinking — not to promise that a specific outcome or tax result will apply to you.

What a Roth In-Plan Conversion Actually Does

In simple terms, converting traditional retirement dollars to Roth means paying income tax now on the converted amount, in exchange for the potential of tax-free qualified withdrawals later. Unlike a Roth IRA conversion done through an outside rollover, an in-plan conversion keeps the money inside your existing employer plan, just reclassified as Roth money going forward.

The appeal is straightforward: if you expect your tax rate to be similar or higher in retirement than it is today, shifting some pre-tax savings into Roth status could reduce future tax exposure. The tradeoff is equally straightforward — you owe tax on the converted amount in the year of the conversion, and that tax bill can be substantial depending on how much you convert.

Roth In-Plan Conversion TSP Checklist

Use the following checklist as a working guide. Go through each item slowly rather than treating this as a one-time decision made in a single afternoon.

1. Confirm What Your Plan Actually Allows

Start by verifying, in writing or through official plan materials, whether in-plan conversions are currently permitted and which account sources qualify. Some plans allow conversion of all traditional balances; others limit conversions to specific contribution types, such as employee contributions versus employer matching funds. Don’t assume based on what a coworker did years ago — plan features are updated periodically.

2. Take Inventory of Your Current Balances

List out how much you currently hold in traditional versus Roth balances. Include any outstanding loans, recent contributions, and agency or service matching amounts, since these may be treated differently for conversion purposes. Having a clear snapshot makes the rest of the checklist much easier to work through.

3. Estimate the Tax Bill Before You Commit

Converting $20,000 from traditional to Roth status means that $20,000 (or more, depending on the source) is typically added to your taxable income for the year. Run the numbers using your expected tax bracket, not just your current one. A conversion that looks appealing on paper can push you into a higher bracket or affect other income-based calculations, such as Medicare premium thresholds later in life.

4. Check Where You Sit in Your Current Tax Bracket

One of the more overlooked steps is figuring out how much “room” exists before you cross into the next tax bracket. Some people convert only enough to fill up their current bracket without spilling into a higher one. This kind of partial conversion approach is common precisely because it limits the size of the tax bill in any single year.

5. Think About Timing Relative to Your Career and Retirement Date

Income tends to fluctuate across a career — lower in early years, higher during peak earning years, and often lower again after retirement begins. A conversion made during a lower-income year, such as a period of unpaid leave, a career transition, or the early years of retirement before pension and Social Security payments begin, may result in a smaller tax hit than converting during peak salary years.

6. Understand the Five-Year Holding Rule

Roth withdrawals of earnings are generally only tax-free if certain conditions are met, including a five-year holding period that starts on January 1 of the year of the first Roth contribution or conversion. If you’re converting close to retirement, factor in whether you’ll meet this holding period before you plan to withdraw converted earnings.

7. Coordinate the Conversion With Other Retirement Income Sources

A Roth in-plan conversion TSP decision rarely happens in isolation. Pension income, Social Security timing, rental income, or a spouse’s earnings all affect your total taxable income in the conversion year. Map out your expected income sources for the year you’re considering a conversion so the tax estimate reflects your full financial picture, not just the T

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