Louisiana Department of Revenue Form Instructions
- cift-620 CIFT-620 Instructions - Corporation Income & Franchise Tax
- cift-620es CIFT-620ES Instructions - Corporation Estimated Tax
- cit-620es CIT-620ES Instructions - Corporation Estimated Tax (2026 series)
- it-540 IT-540 Instructions - Louisiana Resident Income Tax (line-by-line booklet)
- it-540b IT-540B Instructions - Louisiana Nonresident & Part-Year Income Tax
- it-540es IT-540ES Instructions - Estimated Tax for Individuals
- it-541 IT-541 Instructions - Louisiana Fiduciary Income Tax
- it-565 IT-565 Instructions - Partnership Return of Income (incl. Pass-Through Entity Election)
- r-1029 R-1029 Instructions - Louisiana Sales Tax Return