Laws.com legal forms guide provides Form 511 NR for Oklahoma non-resident or part-year residents who need to file their state income tax return. This form can be found on the Oklahoma Tax Commission website and can also be used for filing an amended return. Here's a breakdown of the steps to complete the form: Step 1: On the top of the first page, enter your social security number and your spouse's if filing jointly. Check the if either party is deceased or if you're filing an amended return. Step 2: Enter your full name and address. If filing jointly, include your spouse's full name as well. Step 3: Indicate your filing status by checking the appropriate . Step 4: If you're filing as a non-resident, enter your state of residence. If you're filing as a part-year resident, provide the starting and ending dates of your residence. Check the if you or your spouse is over the age of 65. Step 5: Lines 1 through 24 provide instructions for calculating your adjusted gross income. Enter all numbers related to your total income in the left column labeled federal amount, and the amounts specific to income derived from Oklahoma in the right column. Complete lines 1 through 19 as instructed. Step 6: To determine your Oklahoma additions, complete Schedule 511 A on the third page and then complete line 21 as instructed. Also, complete Schedule 511 NR beyond the third page to determine your subtractions, and then complete lines 23 and 24 as instructed. Step 7: Complete line 25 as instructed. Complete Schedule 511 B to determine your adjustments on line 26, and then complete lines 27 through 32 as instructed. Step 8: If you're claiming a child care or child tax credit, complete Schedule 511 C on the fourth page and enter the result on line 33. Complete lines...