Write-offs are ordinary and necessary — not a shopping list

Ordinary means common and accepted in that trade. Necessary means helpful and appropriate. Personal living costs stay personal. Mixing those two is how deductions get disallowed.

Home office, vehicle, meals, startup costs, depreciation elections, retirement, and health plans each have their own IRS topics. Substantiation (receipts, mileage logs, exclusive-use rooms) is part of the rule, not optional flavor.

S-corp officer reimbursements generally need an accountable plan. Distributions are not a substitute for wages when the owner works in the business.

This library is education. A CPA maps your books onto the return. There is no 'AI found $12,000 you can write off' product here.