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§481 adjustment
12-month rule
Accounting method
Accounting period
All-events test
Allowance method
Arm’s-length amount
Direct write-off method
Economic performance test
First-in, first-out (FIFO) method
Fiscal year
Flow-through entities
Gross receipts test
Impermissible accounting method
Last-in, first-out (LIFO) method
Mixed-motive expenditures
Ordinary and necessary
Payment liabilities
Permissible accounting method
Personal expenses
Reasonable in amount
Recurring item
Specific identification method
Tax year
Travel expenses
Uniform cost capitalization (UNICAP) rules
