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12 Deductions Small-Business Owners Miss

5 min readUpdated Mar 2026

12 Deductions Small-Business Owners Miss

From the home-office safe harbor to the QBI deduction, these are the write-offs we most often add back when a new client brings us last year's return.

Most missed deductions aren't exotic — they're ordinary expenses people forget to track or assume they can't claim. Here are the ones we catch most often.

  • Home-office deduction (simplified $5/sq ft method)
  • Health-insurance premiums for the self-employed
  • The 20% Qualified Business Income (QBI) deduction
  • Half of your self-employment tax
  • Retirement contributions (SEP-IRA, Solo 401k)
  • Business use of your vehicle and mileage
  • Continuing education and professional dues
  • Software, subscriptions, and tools of the trade

Track it as you go

The single biggest predictor of a clean, fully-deducted return is bookkeeping that's current. When the records are tidy, nothing gets left on the table.

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