Dear Rusty: My full retirement age (FRA) is 66 and 8 months, which I’ll reach in September 2024. I’m still working 3 days a week. I want to cash in my 401(k)and want to know if I have to wait until my FRA for IRS purposes or can cash it in anytime in 2024. I don’t want to affect my Social Security or end up paying taxes on my benefits.