If you get a refund during tax season, it means you gave the government extra money throughout the year. Technically it sounds like a loan. Shouldn't we receive interest on that? At the very least, shouldn't we be able to have our taxes done for free?
Image from here
And if you owe, then you pay to get your taxes done for you (or do it yourself). I don't know about the interest part because maybe you didn't know you owe until after you did your taxes.