RMDs: The Deadline That Decides Your Tax Bill

For decades you were rewarded for putting money into a 401(k) or Traditional IRA. Then, at a specific birthday, the rules flip. Required Minimum Distributions — RMDs — force you to take money out whether you need it or not, and to pay ordinary income tax on every dollar.

Under current law, RMDs begin at age 73 for most people, moving to 75 later this decade. The amount is calculated by dividing your prior year-end balance by an IRS life-expectancy factor. The percentage rises every year, so the bite grows exactly as other retirement costs — healthcare, care needs, inflation — grow too.

The real problem is rarely the withdrawal itself. It is what the withdrawal triggers. A large RMD can push more of your Social Security into taxable territory, raise your Medicare Part B and D premiums through IRMAA two years later, and lift your capital gains into a higher rate. Miss the deadline entirely and the penalty is 25% of the shortfall — 10% if corrected quickly.

The planning window is the decade before RMDs start. Partial Roth conversions in low-income years shrink the balance that RMDs are calculated on. Qualified Charitable Distributions let those over 70 1/2 send up to a set annual amount straight to charity, satisfying the RMD without it ever hitting your taxable income. Coordinating which account you spend from first can flatten the whole curve.

RMDs are predictable years in advance. That makes them one of the few tax events you can plan around rather than react to.