They don't. Combined they make 75k. That's not much, especially combined. People (myself included) who make multiple times that don't pay accountants to do our taxes, because it's just not necessary. And that's with various investments, itemized deductions, and non-job sources of income that generate 1099s.

H&R Block and its ilk have done a fantastic job of convincing everyone that taxes are hard or complex or that you're going to get in trouble if you make one little mistake. Even if you get audited and are found to owe something you didn't pay, you're just given the chance to pay up (potentially with interest) and everything is fine. Then you file an amended return, pay the difference, and go on with your life.