When a spreadsheet works
A few hundred transactions per year, a single revenue stream, no inventory, no employees, simple expense categories — a spreadsheet (Excel, Google Sheets) can capture everything you need for Schedule C. Use one tab per month, columns for date, payee, amount, category, and notes.
When you need software
Multiple revenue channels (1099-NEC + 1099-K + cash). Inventory. Accounts receivable that need invoicing and tracking. Employees or contractors who require 1099 generation. State sales tax collection. Multi-state operations. Anything that benefits from automated bank reconciliation.
Common options
QuickBooks Online (most popular, ecosystem advantage). Wave (free, good for very small businesses). FreshBooks (invoicing-focused). Xero (good for international). QuickBooks Self-Employed (specifically designed for sole prop / freelancer with mileage tracking and quarterly estimated tax computation).
Connecting bank feeds
All modern accounting software connects to your bank and credit card accounts via Plaid or direct integration, downloading transactions automatically. Categorization is largely automatic after you teach the system your patterns. This eliminates 80% of the manual data entry that scared people away from bookkeeping in the past.
Hire a bookkeeper
Once revenue exceeds about $200,000 or transaction volume gets heavy, hiring a part-time or fractional bookkeeper to keep the books clean, reconcile monthly, and prepare clean year-end reports for the tax preparer is usually worth the cost. A good bookkeeper saves more in tax prep fees and missed deductions than they cost.
Common mistakes worth avoiding
The recurring mistakes filers make on this topic cluster in three patterns: (1) optimizing for current-year tax at the expense of multi-year tax, (2) treating the choice as binary when the IRS framework actually allows nuance (partial elections, hybrid methods, year-by-year reassessments), and (3) deferring the analysis until the return is due rather than running it during the year when the result can still influence behavior. A short annual review — even thirty minutes — catches all three failure modes and replaces vague intuition with documented reasoning.
When to bring in a professional
DIY tax software handles most small-business returns competently, but a handful of situations reliably justify a CPA or enrolled agent: an entity formation or election, a multi-state filing situation, a significant fixed-asset purchase that triggers Section 179 or bonus depreciation modeling, a retirement-plan setup, an IRS notice or examination, and the year of an entity sale. Outside those situations, software plus an annual half-day of personal review produces a defensible return. The cheapest professional engagement is a one-hour consultation rather than a full-service tax-prep relationship.