Women, it’s time take stock. Tuesday is Equal Pay Day, the date in 2016 that marks how far into this year women must work to earn just what men earned in the previous year.

But before you get too comfortable, consider this: that gender pay gap has implications far beyond the obvious disparity.

For example, the gap is a key reason why women’s Social Security payments in retirement are smaller than men’s, according to a report published earlier this month by Congress’ Joint Economic Council.