Business tax guide
Mixed-Use Business Expenses
Business use and personal use need different treatment.
Explain why mixed-use expenses need allocation instead of guesswork.
Run the related calculatorScore records
Documentation Scorecard
Check caution
Dangerous Deduction Checker
The issue
Phone, internet, car, home office, travel, and equipment can have both business and personal use. The record should explain the split.
The better move
Write the business-use percentage and the method while the expense is fresh.
Tax planning boundary
This guide is educational planning content. Tax rules, thresholds, forms, deadlines, and state rules can change. Use the linked calculators to expose assumptions, then verify filing positions with current IRS forms, tax software, or a qualified tax professional.
For a useful first pass, enter conservative numbers and save the aggressive assumptions for a separate scenario. The page is meant to show which variable deserves attention: income timing, deduction proof, payroll cost, reserve percentage, entity choice, or the gap between booked income and cash actually collected.