Small Business Tax Planning Checklist for 2026

Most small businesses overpay tax because planning happens after the year ends - when the levers that actually move the number are out of reach. This checklist walks through the decisions that have the biggest effect when you make them on time, with the same structure our CPA team uses for clients across Georgia and the wider U.S.

Quarterly: keep the IRS quiet

Federal estimated tax payments are due in April, June, September and January. Missing them triggers underpayment penalties even if your return is filed on time. Confirm your safe-harbor number (the lesser of 100% of last year's tax or 90% of this year's projected tax) and automate the payment.

• Reconcile bank and credit-card accounts within 10 days of month-end.
• Run a rolling 12-month profit-and-loss to compare to last year.
• File state sales tax and payroll deposits on the schedule your state assigns - not when it's convenient.

Mid-year: pick the right entity and retirement plan

Entity choice (LLC, S-Corp election, C-Corp) drives self-employment tax, payroll cost and deduction eligibility. The right answer depends on net income, owner compensation and your growth plan - not on what worked for a friend's business. The same is true for retirement plans: a SEP-IRA, Solo 401(k) and Defined Benefit plan all serve very different profiles.

Q4: accelerate deductions, defer income

Once you can see year-end clearly, the levers are timing-based. The standard moves below are all legal, well-documented, and often missed.

• Section 179 and bonus depreciation on equipment placed in service before December 31.
• Pre-pay deductible expenses (insurance, professional services, subscriptions) where cash flow allows.
• Fund retirement accounts to the legal maximum.
• Review accounts receivable and write off uncollectible invoices.

Documentation that survives an audit

Deductions you cannot substantiate are deductions you do not have. Keep contemporaneous mileage logs, written reasonable-compensation analyses for S-Corp owners, and signed accountable-plan policies for reimbursed expenses. A well-organized digital archive removes 90% of the stress of any future IRS notice.