Get your taxes done using TurboTax

Yes, I have entered everything correctly, but it still shows that he owes almost 3K. 

 

Does paying $8672 in taxes on an income of $63K for a 70 y/o filing as single sound correct? 

 

I will never comprehend how taxes are calculated. I have tried to crunch the numbers multiple ways, but it never adds up to me. If you have some sort of simple calculation I can use, that would be great.