Turns out that according to this calculator, my wife and I earned a small marriage bonus this year, meaning we paid less tax than we would have if we hadn’t gotten married. So I think we’ll stick together!

If we'd had a child, the tax impact of our getting married would have been different — in fact, we would have had to pay a marriage penalty. The reason is that if we hadn't gotten married, one of us could have filed as a head of household and claimed our child as a dependent, which in some cases is better than being married and filing jointly.