Tax Essentials for First-Time Business Owners Under $25K Revenue

Even at modest revenue levels, self-employment tax applies in full and hobby loss rules create audit risk. Simple recordkeeping and understanding estimated payment requirements keeps you compliant and avoids surprise tax bills.

Self-employment tax still applies in full. Even at low revenue, net earnings above $400 trigger self-employment tax at 15.3%. On $20,000 of net profit, that is roughly $2,826 in SE tax alone -- often a surprise for people used to W-2 withholding.

Hobby loss rules are a real risk. Under IRC Section 183, the IRS can reclassify your business as a hobby if you show losses in three of five consecutive years. A hobby cannot deduct expenses exceeding income, which means you lose the ability to offset other income with business losses. The IRS examines nine factors including profit motive, time spent, and expertise.

Cash method and simple recordkeeping work fine. At this revenue level, you likely do not need bookkeeping software or formal accounting. A spreadsheet tracking income and expenses, plus saved receipts, meets IRS requirements. You report on Schedule C.

Quarterly estimated payments are still required. If you expect to owe $1,000 or more in tax (including SE tax), the IRS requires quarterly estimated payments. Missing them triggers underpayment penalties.

The pitfall: People at this revenue level often skip estimated payments and then face a surprise tax bill plus penalties at filing time.