Roth In‑Plan Conversions: A Quick Guide for Military Families – Part One

Earlier this year, we focused on getting comfortable with the TSP, including what it is, how it works, and why it’s one of the simplest and most powerful wealth-building tools available to military families. Now that you’ve got those fundamentals down, it’s a great time to take the next step and look at one of the more advanced features inside your account: Roth in-plan conversions, including what it is, how it works, and why it’s one of the simplest and most powerful wealth-building tools available to military families.

Think of this as moving from understanding the basics to learning how to use the TSP more strategically. A lot of service members don’t realize this option even exists, but when used at the right time, it can shape both your tax bill today and your financial flexibility in retirement. My goal here is to walk you through it in the same clear, practical way we approached the basics without jargon, just the information you need to make a confident decision.

Let’s break it down together.

What Is a Roth in‑Plan Conversion?

A Roth in‑plan conversion moves money from your traditional (pre-tax) TSP balance into your Roth (after-tax) balance. You’re not withdrawing anything, you’re just shifting it inside your account. The trade-off is straightforward: you pay taxes now so you can enjoy tax-free withdrawals later, as long as IRS rules are met.

Think of it as choosing when you want to pay the tax bill now or later, in retirement.

A Quick TSP Refresher:

• Traditional TSP gives you a tax break today. You don’t pay taxes on the money you contribute, but you will pay taxes on both the contributions and the growth when you withdraw it in retirement.
• Roth TSP works the opposite way. You pay taxes on the contribution now, but both your contributions and the growth come is withdrawn tax-free in retirement if you follow the rules.

A Roth in‑plan conversion takes money you originally contributed as Traditional and treats it as if you had contributed it as Roth all along, meaning you settle the tax bill today in exchange for tax-free income later.

Who Can Convert?

Almost everyone with a TSP can do a Roth in‑plan conversion, including:

• Active‑duty service members
• Federal civilians
• Retirees
• Spouse beneficiaries
• Non-spouse beneficiaries are the ONLY group excluded.

The minimum conversion amount is $500, and you can do up to 26 conversions per year.

Special Note for Service Members with Combat‑Zone Contributions

If you’ve contributed tax-exempt money while deployed, a portion of your conversion will also be tax-exempt. However, the IRS requires conversions to be proportional, so you can’t choose to convert only the tax-free portion.

This means:

• If your tax-exempt balance is small, most of your conversion will still be taxable.
• If your tax-exempt balance is large, more of your conversion will be tax-free.

This is one area where military members have a unique advantage, but only if the math works in your favor.

Don’t forget to check out part two of this Roth In-Plan Conversions mini-series!

Find Out More with My Military Savings and Finances!