| File | Topic |
|---|---|
| Chapter 16 - Business Deductions/16.1-ordinary-necessary-expenses.md | Ordinary/Necessary, Travel, Meals, Home Office |
Key concepts: Ordinary and necessary standard, travel away from tax home (meals 50%), entertainment 0% (post-TCJA), standard mileage (70 cents), home office (regular and exclusive use, principal place, two calculation methods), related-party loss disallowance, NOL (80% of taxable income, no carryback except farms).
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