Reviewed and updated October 16, 2026

Build a reliable business profit calculation

A self-employed person generally reports business income and qualifying business expenses before calculating income tax and self-employment tax. Keep business receipts separate from personal transfers, loan proceeds and owner contributions. A payment platform’s reporting threshold is not the threshold for taxable income.

Review ordinary business categories such as supplies, advertising, professional fees and insurance. For costs shared with personal use, keep records supporting the business portion rather than applying a convenient round percentage.

Give limited deductions their own review

Vehicle expenses, home-office costs, equipment and meals have separate requirements. Commuting does not become a business trip simply because you are self-employed. Home-office eligibility depends on how the space is used and the applicable rules.

Qualifying health-insurance deductions and retirement contributions may be reported outside the Schedule C expense calculation. The deduction for part of self-employment tax also belongs in its proper place. These distinctions matter because moving a number to the wrong line can change other calculations.

Use a monthly routine

Reconcile accounts, save receipts, update mileage records and review unpaid customer invoices. Keep a list of asset purchases with dates, business use and financing details. Calculate estimated tax from projected household income, including a spouse’s wages or another job when relevant.

Before filing, provide your preparer with consistent statements and supporting schedules rather than a collection of unexplained deposits. Ask which deductions apply to your circumstances and tax year. Spending extra money solely to create a deduction usually leaves less cash available for the business.

Official sources

This guide provides general information. The rules depend on the tax year, jurisdiction and your circumstances. Ask our team which filing or planning steps apply to you.