What happens if your TSP beneficiary designation form is out of date?

The form controls before a will does

A valid Form TSP-3 directs the TSP account, and a will does not replace it. That is why an estate document signed after a divorce can leave the TSP exactly as it was. The will speaks to what the estate owns, but the TSP pays whoever the form names. Many veterans filed the form at their first duty station, picked a spouse, and never looked again. Years later a will says one thing, the TSP record says another, and the TSP follows its own record. Nobody gets to argue the point at the funeral.

What does a TSP-3 actually direct?

Form TSP-3 directs only your Thrift Savings Plan account. The TSP requires 2 witnesses to sign it, and the shares you assign must add up to 100 percent. If the form is missing the witnesses or the shares add up to 99 or 101 percent, the TSP can treat it as invalid, and then the default rules decide.

If you have no valid form, the TSP pays in a fixed statutory order: your spouse, then your children, then your parents, then the executor or administrator of your estate, and last your next of kin. Say you're divorced with 2 adult children and no valid form on file. The money goes to the children in equal shares, whether or not that's what you meant. Say instead the old form still names a former spouse. Then the former spouse can be paid, and the children get nothing from this account.

Three federal forms get mixed up here, and each one stands alone. TSP-3 covers the TSP. SF 2823 covers FEGLI life insurance. SF 3102 covers a FERS death benefit. Changing one does not change the other two, so a clean TSP-3 can sit next to an old SF 2823 that still names the wrong person.

The 2 rules that make a form valid

Three forms, three separate designations

A form filed too early can outlast the marriage

Timing runs in calendar order, and the mistake is almost always a late one: waiting until after a divorce, remarriage or separation to read an old TSP-3 can leave a former spouse or the statutory order in control of a six-figure account, and a later will doesn't repair it. So review the form after any divorce, marriage, death of a named beneficiary, or birth or adoption of a child. Submit the completed TSP-3 before a separation takes effect, and keep the confirmation. Then, around age 63, revisit the tax character of the account before any Roth conversion, because the income from a conversion counts toward Medicare premiums at age 65 through the 2-year lookback. Edgepoint Wealth Management starts with the form because it takes one afternoon, and the tax work can follow.

At 57, Omar's old form meets a Roth conversion idea

Omar (hypothetical), 57, is a retired Army colonel with 28 years of service. He's divorced, works as a consulting director earning $180,000, and collects an $8,000 a month military pension, which is $96,000 a year. He has $900,000 in mostly traditional TSP money. While gathering records for a possible Roth conversion, he finds that a TSP-3 filed before his divorce still names his former spouse.

He corrects that first. He replaces the form now, with 2 witnesses and shares that add up to 100 percent, even though the conversion decision is separate and still open. Then he looks at the numbers. If he converts $100,000 and pays an assumed 24 percent tax from cash, the bill is $100,000 × 24 percent = $24,000. At an illustrative 5 percent a year, that $100,000 becomes $127,628 after 5 years. If an adult child would later pay an assumed 32 percent on inherited traditional money, $127,628 × 32 percent = $40,841 of tax exposure.

Which question does the table answer? It asks when the tax paid now falls below the future tax that could be avoided. Year 0 already shows a benefit of $32,000 against a $24,000 cost, because $100,000 × 32 percent is $32,000. The gap widens each year the money grows.

Omar's income matters too. His $180,000 salary, $96,000 pension and $100,000 conversion add up to $376,000 of assumed income before adjustments. The conversion raises his modified adjusted gross income (MAGI, the income number Medicare looks at). Done near Medicare enrollment, it can touch the IRMAA threshold in effect 2 years later. For 2026 the CMS standard Part B premium is $202.90 a month, while a single filer in the band from $205,000 up to $500,000 pays $649.20. You can test numbers like these in the calculator on this site.

What's left for Omar is a real choice. Lower future earnings and enough cash to pay the tax favor a later conversion analysis. A higher income now favors waiting. The TSP-3 correction should not wait for any of it.

The numbers behind Omar's choice

What the income does to Medicare

Does a beneficiary form lower the tax bill?

A beneficiary form controls who receives the account, but it does not erase ordinary income tax on inherited traditional TSP money. Whoever inherits pays income tax on what they take out, at their own rate. The form moves the money. It doesn't shrink the bill.

The three choices compare like this. Updating individual shares gives you control and keeps traditional tax treatment. Converting part of the account and updating shares moves some tax into the conversion year, which you pay. Leaving no form gives the statutory order and no tax improvement at all.

The rules also changed. Under the IRS rules now in place, many non-spouse beneficiaries can no longer stretch an inherited account over a lifetime. They generally must empty it within 10 years. An older estate document built around decades of small annual income draws needs a fresh look. An adult child may now take larger draws in the same years their own salary is at its highest.

A Roth conversion can reduce later taxable-account exposure for your heirs. But no investment result is guaranteed, and account values can fall, sometimes for years. Conversions are reported to the IRS on Form 1099-R and Form 8606, so keep those records.

Three choices on the same terms

The 10-year rule and older documents

Where Edgepoint Wealth Management reviews a TSP beneficiary designation form

Edgepoint Wealth Management would start with your current TSP-3, any divorce or marriage documents that affect who you want paid, and your latest TSP statement. We also need rough figures for wages, pension income and any conversion income you're considering. Bring copies of SF 2823 or SF 3102 if those forms exist, because each designation has to be checked on its own terms. Clients in any state can do this review by video or phone.