Dear Rusty: I am a married woman, at my full retirement age, and the primary earner in my marriage. How do I know if I should take my Social Security now or wait till 70? I will lose quite a bit if I take it now. How will it affect my taxes if I take it now while still working a full-time job? Signed: Undecided Dear Undecided: As you apparently already know, waiting until you are 70 to claim Social Security will result in you getting your maximum possible monthly SS retirement benefit. After your full retirement age, you get about 8% more each year you delay claiming up to age 70. But deciding exactly when to claim should consider both your financial needs and, importantly, your life expectancy. If you don’t urgently need the money now and your life expectancy is at least “average,” then waiting until age 70 to claim is usually the right choice. But if you urgently need the money, or your life expectancy is less than average (mid-80s for a woman your current age), then claiming before age 70 is usually prudent.