The sudden windfall won't reduce your benefits. Here's why. Getty Images By Kimberly Lankford, Contributing Editor March 8, 2018From Kiplinger's Personal Finance QIf I win the Powerball jackpot, will that affect my Social Security benefits? I'm 63, so I'm worried about the earnings test. -L.S., Boca Raton, Fla.See Also: 5 Better Investments Than Powerball ALottery winnings aren't subject to the Social Security earnings test, so your windfall won't reduce your benefits. But like other high-income households, you may have to pay bigger Medicare Part B premiums at age 65. The top premium today is $428 per month. Got a question? Ask Kim at firstname.lastname@example.org.