I owe 800$ in state taxes this year. Why is it so much this year as compared to previous years

[xmasbaby0]

No one else can see your tax return, so we do not know what if anything changed for your 2019 state return.  If the change is very unusual for you and there have been no changes in your income or withholding amounts, then first---check every amount you entered under state income and state withholding from your W-2's to see if you made any data entry errors.  Look for typos, misplaced decimals and extra zeros.  Another way to compare is to print 2018 and 2019 and compare them side by side.

[DavidS127]

In addition to Community user xmasbaby0's recommendation to check your entries, another way to figure this out in TurboTax is find the "Two-Year Summary" worksheet in your tax file.  For TurboTax Online users, you can find that worksheet if you "Print, Preview, or View a PDF" of you tax return with all the worksheets.  That Two-Year Summary "lays 2018 and 2019 side by side" and shows the difference between the two years.  Using that, you can isolate the reasons your owe money this year.

You can find the Two-Year Summary in Forms mode (icon top right in blue bar) if you are using a Download/CD version of TurboTax.

[Edited 03/17/2020|11:34am PST]

@lybarni