Georgia Self-Employed — Schedule C, Form 500 & Quarterly Estimates

Confirm the taxpayer is a Georgia resident (or part-year resident) and that the business is a sole proprietorship or disregarded single-member LLC — not a corporation or partnership. Establish the tax year, collect the prior-year Form 500 for safe-harbor comparison, and flag whether a prior S-corp or PTET election exists. This phase also screens for multi-state activity that would require Georgia apportionment.

Gather all business revenue and deductible expenses to prepare the federal Schedule C. Reconcile gross receipts to bank deposits and payment-processor 1099-Ks, categorize deductions (home office, vehicle, supplies, software, sub-contractors), and apply the §179 / depreciation schedule — noting that Georgia does NOT conform to §168(k) bonus depreciation, requiring a Georgia add-back on Form 500 Schedule 1.

Compute the federal self-employment tax on Schedule SE (15.3% on net earnings up to $176,100 FICA wage base for 2025; 2.9% Medicare above that). Derive the above-the-line deduction for one-half of SE tax and the self-employed health insurance deduction, both of which flow through federal AGI and carry into the Georgia Form 500 base. Determine whether the §199A QBI deduction applies federally.

Apply the Georgia 5.39% flat rate (TY 2025, per HB 111) to Georgia taxable income. Start from federal AGI, apply Georgia-specific additions (bonus depreciation add-back, any federal tax benefits Georgia has decoupled from) and subtractions (retirement income exclusion if applicable, up to $35,000 for taxpayers 62–64 or $65,000 for 65+). Confirm the standard deduction or itemized deductions, personal exemptions, and any credits (low-income credit, rural hospital credit, transferable film credits if purchased).

Establish the safe-harbor amount for the upcoming year (lesser of 100%/110% of prior-year Georgia tax or 70% of projected current-year tax under O.C.G.A. §48-7-120), divide into four equal installments of 25% each, and schedule payment due dates (April 15, June 15, September 15, January 15). Flag the $1,000 threshold and the high-income 110% modifier if prior-year federal AGI exceeded $150,000. For self-employed taxpayers with lumpy or seasonal income, assess whether the annualized income method on Form 500-UET Part III would reduce Q1–Q3 payments.

For clients with net Schedule C income consistently above approximately $60,000–$80,000, model the potential SE-tax savings from electing S-corp status (Form 2553). As an S-corp owner-employee, reasonable W-2 compensation is subject to FICA; the remainder flows as K-1 distributions exempt from SE tax. Layer in Georgia implications: the S-corp would owe Georgia Net Worth Tax on Form 600S Part III (minimum $10), and a PTET election under O.C.G.A. §48-7-23 at 5.39% would provide a federal SALT deduction above the $40,000 OBBBA cap for very high earners. This phase produces a go/no-go recommendation.