Hello lady bug,
There will be absolutely no difference in the tax that you end up owing for the year, regardless of whether or nor you get married and file a joint return or if you wait until next year to get married and file this year as single.
Just to give you an example here -- if you each have income of $50,000, then if you file as single, after applying your standard deduction
and one personal allowance, you would have taxable income
of approximately $40,000. Your tax on that will be $6,175.
If you get married and have combined income of $100,000, then your deductions
double and you have taxable income of around $80,000. Your tax on that would be $12,350.
So you still end up paying a total of $12,350 between the two of you.
As far as you moving from WV to Kentucky, even your state taxes will not change by much. On your salary range, you are paying roughly 6% tax to WV and when you move to KY, your state tax on the same income would be 5.8%, so there will be very little difference for you in state taxes once you move.
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Thank you lady bug