When Do Minimum Distributions Start?
Minimum distribution requirements come into play when an owner of a qualified retirement plan reaches age 70-1/2, or when a beneficiary assumes or inherits an IRA from the deceased owner.
The withdrawal for the first year of the distribution can be deferred to the following year (for tax purposes) but must be withdrawn before April 1st. After that withdrawals must be made before December 31st. The penalty for insufficient distributions is 50% of the undistributed amount.
Minimum Distribution Formula
To calculate the amount of your required minimum withdrawal, you first need to look up your life expectancy factor in the IRS life expectancy tables.
Once you find your life expectancy factor, you then divide the year-end balance of your IRA by that factor. The result is the amount you are required to withdraw from your IRA by the end of the current year (or April 15th of the following year if this is your first year of making required withdrawals).
IRS Life Expectancy Tables
IRS Life Expectancy Tables are three tables provided by IRS Publication 590-B for determining minimum distribution requirements for qualified retirement plans. The three tables are Single, Joint Life and Last Survivor, and Uniform Lifetime.
How the IRA Growth and Distribution Calculator Works
The IRA Growth and Distribution Calculator is based on Table II (Joint Life and Last Survivor Expectancy) and Table III (Uniform Lifetime) Table from IRS Publication 590-B (2018) (opens new window).
If your spouse is the sole beneficiary and is more than ten years younger than you, Table II is used. If you are unmarried or your spouse is not more than ten years younger than you, or your spouse is not your sole beneficiary, Table III is used. In either case, the calculator will indicate which table was used in the displayed results.