Prepare IRS Form 1120S, U.S. Income Tax Return for an S Corporation. You can obtain a copy of this form on the IRS website (link in Resources). Completing the federal S corp tax return before you start on your Georgia state return is essential as the Georgia tax form will reference amounts on the 1120S.
Obtain Georgia Form 600S and its instructions. You can obtain a copy of this form and the accompanying instructions on the Georgia Dept. of Revenue website (see Resources).
Complete Schedules 5 and 6 of Form 600S. These schedules cover the adjustments you must make to amounts reported on the federal return. For example, the IRS allows S corporations to exclude municipal bond interest from taxable income, while Georgia only allows the exclusion for Georgia municipal bonds.
Apportion total income to Georgia. Form 600S uses the gross receipts factor (the ratio of the S corporation’s revenue from Georgia to its total revenue) to arrive at the corporation’s total income subject to state income tax. Revenue is attributed to Georgia if it’s earned by shipping goods to customers within the state or providing services to customers within the state.
Compute total income for Georgia purposes. You will need a copy of Form 1120S since the computation starts with the amount reported on the “Ordinary Business Income/(Loss)” line of your federal tax return.
Calculate the S corporation’s Georgia net income. The Net Income section will extract the data you reported in the other sections to calculate the net income amount that must be allocated among the shareholders or members for reporting on a Georgia state income tax return.
File your completed Form 600S state return. You can mail the form to the Georgia Dept. of Revenue Processing Center at P.O. Box 740391, Atlanta GA 30374-0391. The due date is the 15th day of the third month following the close of the S corporation’s tax year.