Dear Liz: If I continue to work after 70, will Social Security taxes still be deducted from my check? I understand my benefits will cap out at 70, so why would I need to still pay into the fund?

Answer: Because Social Security is insurance, not a bank account.

And it may not be true that your benefit maxes out at 70, if you continue to work. It’s true that delayed retirement credits no longer increase your benefit if you delay starting Social Security past age 70. But as long as you continue working, you’re potentially growing your benefit.

Your Social Security check is based on your 35 highest-earning years, adjusted for inflation. If you make more in a current year than you made in one of those previous highest-earning years, the current year will be substituted for the earlier one. That in turn can increase your benefit. This can happen at any age, including after you start benefits.

You might not see much increase, of course, or any increase at all if you’ve earned a high income for a long time. If you exceeded the maximum income limits subject to Social Security taxation every year for 35 years, your benefit wouldn’t increase with additional work. (In 2019, for example, the maximum income limit is $132,900; you don’t pay Social Security tax on earnings above that level, although you continue to pay Medicare tax.)

On the other hand, your benefits won’t be stopped once you collect as much from the system as you paid in. You will continue receiving benefits for as long as you live, even if that amount far exceeds what you’ve paid in taxes. That’s insurance worth paying for.