The Official Website of the Louisiana Department of Revenue
Every employer who has resident or nonresident employees performing services (except employees exempt from income tax withholding) within Louisiana is required to withhold Louisiana income tax based on the employee's withholding exemption certificate. Wages of Louisiana residents performing services in other states are subject to withholding of Louisiana income tax if the wages are not subject to withholding of net income tax by the state in which the services are performed.
Every employer who withheld or was required to withhold income tax from wages must file the employer's return of Louisiana state income tax withheld. Each employer who withholds from the combined wages of all employees less than $500 per month is required to file on a quarterly basis. Each employer who withholds from the combined wages of all employees at least $500 but less than $2,000 per month is required to file on a monthly basis. Each employer who withholds from the combined wages of all employees $2,000 per month or more must file on a semimonthly basis.
Louisiana Administrative Code 61:I.1501 provides income tax withholding tables to be used for computing the proper amount to be withheld based on the employees income, filing status, and number of exemptions. The formula used to compute the withholding tables is as follows:
W = Withholding tax. S = Salary per period. X = Number of personal exemptions claimed for withholding; X may be 0, 1, or 2. Y = Number of dependency credits claimed for withholding; Y may be 0 or greater. M = Income Brackets for tax rate change. If X = 0 or 1, then M1 = $12,500, and M2 = $25,000 If X = 2, then M1 = $25,000, and M2 = $50,000 N = Number of pay-periods per year (for example, weekly = 52 or monthly =12). If S > 0 Then A = (S * .021) Else A = 0 If S > (M1 / N) Then B = .0135 [S - (M1 / N)] Else B = 0 If S > (M2 / N) Then C = .0135 [S - (M2 / N)] Else C = 0 D = .021 {[(X * $4,500) + (Y * $1,000)] / N} If [(X * $4,500) + (Y * $1,000)] > M1 Then E = .0135 {[(X * $4,500) + (Y * $1,000) - M1] / N} If (A + B + C) - (D + E) > 0 Then W = (A + B + C) - (D + E) Else W = 0