Laws calm legal forms guide form i T-540. Individual income tax return resident Louisiana residents file their state income taxes using a form i T-540. This document can be obtained from the website of the Louisiana Department of Revenue. Step 1: At the top of the first page, give your name and social security number, as well as that of your spouse if filing jointly. Step 2: Enter your current home address, city, state, and zip code. Provide a daytime phone number. Step 3: Five numbers are listed corresponding to possible filing statuses. Choose the number corresponding to your filing status. Step 4: Indicate all exemptions being claimed. If claiming dependents, you must provide their names, Social Security numbers, relationship to you, and birth dates. Step 5: Enter your federal adjusted gross income on line 7. Step 6: Enter your federal itemized deductions on line 8a and your federal standard deductions on line 8b. Then subtract the latter from the former and enter the difference on line 8, as instructed. Step 7: Complete schedule H in order to complete line 9. Step 8: Complete lines 10 and 11 as instructed to calculate your Louisiana income tax due before adjustments. Step 9: Lines 12a through 15 concern non-refundable credits. You will need to complete schedule G to complete line 14. Step 10: Lines 16 through 18 adjust your tax liability and add any use tax owed. Step 11: Lines 19 through 23 concern refundable tax credits. To complete line 23, you will first need to complete schedule F. Step 12: Lines 24 through 32 document payments already made. Step 13: Lines 33 through 45 concern voluntary donations. Step 14: Lines 46 through 58 involve the final calculations as instructed to determine your final balance due or refund owed. Sign and date the bottom of the fourth page. If filing jointly with your spouse, they must...