For many federal retirees, the Thrift Savings Plan becomes a key source of retirement income. But regardless of how you plan to use your account, there comes a point when the IRS begins dictating how much must be withdrawn each year.
These mandatory withdrawals are known as Required Minimum Distributions, or RMDs. While the rules are not particularly complicated, overlooking them can create unnecessary tax headaches and potentially costly penalties.
Why RMDs Exist
Traditional TSP contributions are generally made with pre-tax dollars, allowing your savings to grow tax-deferred for years or even decades. The IRS eventually wants to collect taxes on that money.
Required Minimum Distributions are the mechanism used to make that happen. Once you reach the applicable age, you must begin withdrawing at least a minimum amount each year from your traditional TSP balance.
When Are You Required to Start?
The age at which RMDs begin depends on your year of birth:
Born before 1951: age 72
Born between 1951 and 1959: age 73
Born in 1960 or later: age 75
Your first RMD must generally be taken by April 1 of the year following the year you reach your required beginning age. After that, annual distributions must be completed by December 31 each year.
Many retirees choose not to delay the first distribution because postponing it can result in two taxable RMDs being reported in the same calendar year.
The Roth TSP Rule Changed
One of the most significant recent changes involves Roth TSP balances. Beginning in 2024, Roth TSP accounts are no longer subject to lifetime RMD requirements for the original account owner. Prior to this change, participants were required to include both traditional and Roth TSP balances when determining their annual required distribution.
Today, only the traditional portion of the account is subject to the RMD rules. For retirees who have accumulated substantial Roth balances, this creates additional flexibility and allows those assets to continue growing without mandatory withdrawals.
How Your RMD Amount Is Determined
The annual calculation is based on two primary factors:
Your traditional TSP account balance as of December 31 of the previous year
Your IRS life expectancy factor
Fortunately, participants are not responsible for calculating the amount themselves. The TSP calculates the required distribution and provides notice of the amount that must be withdrawn.
What Happens If You Do Nothing?
Unlike many retirement accounts, the TSP has procedures designed to help participants avoid missing an RMD. If your withdrawals during the year are insufficient to satisfy the requirement, the TSP may automatically distribute the remaining amount needed to meet the obligation.
That safeguard helps reduce the likelihood of an accidental violation, but it does not eliminate the need for planning. An unexpected distribution can create tax consequences and may occur at a time that does not fit well with your broader retirement income strategy.
RMDs and Surviving Spouses
RMD obligations do not necessarily end when the original participant dies. If a surviving spouse inherits a TSP account through a beneficiary participant account, distribution requirements may still apply.
The specific rules depend on several factors, including whether the original participant had already reached their required beginning date. In many situations, calculations are based on the surviving spouse’s age rather than the age of the deceased participant.
Planning Ahead Matters
Required Minimum Distributions are simply part of the retirement landscape for most federal retirees. They are not optional, and failing to satisfy the requirement can trigger IRS penalties. The good news is that the TSP does much of the administrative work for you by calculating the required amount and helping participants avoid missed distributions. The key is understanding when the rules begin, how they affect your tax picture, and how they fit into your overall retirement income strategy.
