The worst part about taxes is that I never know if I did them correctly since the feedback loop is up to 3 years. Just shoot them off into the ether and cross your fingers you don't get a giant bill next year.
The first time I filed, I had not updated my W4 soon enough after moving and owed NYC like $4k in taxes which came up around 18 months after I filed. The following year the software I was using said I owed around $10k in taxes, which I was pretty sure was wrong, so I went to an accountant and they did it for me and said I owed nothing. Even after all that, there is no way to know who is right until 3 years from now (IRS theoretically doesn't look back more than 3 years for individual returns).