How is the amount of my first RMD actually calculated?

The IRS calculates your required minimum distribution by dividing your Traditional IRA balance as of December 31 of the prior year by a life-expectancy factor from the IRS Uniform Lifetime Table, which is tied to your age. As you get older the factor shrinks, so the required percentage of your balance rises each year. Your first RMD is due by April 1 of the year after you turn your applicable RMD age, but delaying that first one means taking two in the same calendar year, which can bunch income. If your sole beneficiary is a spouse more than 10 years younger, a different table applies. Estimate yours with the RMD calculator at wealthserene.com/tools/rmd-calculator.