State tax filing

Ahhh....I'm only am familiar with the NC part....I'l look at SC later this morning (if no one else with actual SC experience comments)

...and I probably exaggerated on the One-month....if you only have salary, and Interest, and no Capital gains, no Dividends from stocks or Mutual funds, and no cash/Self-employment income.

You should be printing out the NC part-year file to see what's there, NC uses ALL your federal income, but chops down what is taxed by NC by a decimal on line 13....which ,for a constant monthly wage, and $20 of interest...should be around 0.55-to-0.75.    That value is set by your income allocations during the NC interview
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*