I made the same amount of income in 2015 as I did in 2016 almost do the dollar, comping my W2s.
No changes to 401k or anything else...
..yet... when I just inputted my W2 into HRblock.com
It's telling me I owe $1300 whereas last year after just entering the W2 and not proceeding with any other inputs to the process, they owed me $2,200.
What the heck changed?