State tax filing

NC doesn't calculate it that way for part-year residents.

 

They take your whole-year income, from everywhere and everything, then subtract your Std Ded (or Itemized Ded) from that grand total, to get an NC taxable income-before adjusting  any of it for being a part-year resident.

 

Then they multiply that amount by a decimal (the proportion of your income that is truly NC-taxable) .

 

SO if 60% of your total yearly income was actually NC income, then they'd multiply the total taxable income calculated, by 0.6 to get the final taxable income from which the NC tax will be calculated..

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On the D-400

 

Lines 6-to-12b calculate your total income (potentially subject to NC tax).

Line 13 is the decimal multiplier

line 14 is your actual NC-taxable income

line 15 is the tax calculated for that (usually from a tax table...so it won't be exactly 5.25%) 

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Now I don't know where your -5000 comes  in but I suspect it is part of one of the lines above line 12b

____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*

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