What actually counts as a business expense

Most freelancers overpay tax not because they're bad at math, but because they never wrote down the small stuff. Three hundred dollars a month of legitimate, forgettable expenses is thousands of dollars of profit you got taxed on for no reason.

The test

The standard is whether the expense is ordinary and necessary for your line of work. In plain terms: would another person doing your job reasonably spend this, and did you spend it to earn money rather than to enjoy yourself?

That test answers most edge cases faster than searching for your specific purchase.

Commonly missed

• Software subscriptions, including the $9 ones you forgot you had.
• The business-use share of your phone and internet bill.
• Bank and payment processing fees — Stripe's cut on every invoice is an expense.
• Professional insurance, licenses, and association dues.
• Courses, books, and conferences that maintain or improve the skills you already sell.
• Mileage to a client site, at the standard rate, if you logged the trip.
• A portion of your home costs, if you have a space used regularly and exclusively for work.

Commonly gotten wrong

Clothing is the classic one. A suit you could wear to a wedding is not deductible even if you only ever wear it to client meetings. Branded uniforms and genuine safety gear are.

Meals are partly deductible when there's a business purpose and usually a person across the table. Lunch alone at your desk is not a business expense, however much work you did during it.

Training that qualifies you for a new profession is treated differently from training that sharpens the one you're in. A copywriter's writing workshop is straightforward; a copywriter's nursing degree is not.

Mixed-use purchases

A laptop used 80% for client work and 20% for streaming isn't all-or-nothing — you deduct the business share. Pick an honest percentage, write down how you arrived at it, and use the same one consistently. Consistency is what makes an estimate defensible.

The part that actually matters

Knowing the rules is the easy half. The hard half is having a record in December of something you bought in March.

A deduction you can't evidence is a deduction you don't take.

Two habits cover it. Run business spending through one card, so your statement is already most of your bookkeeping. And log expenses into a single categorized sheet as they happen, rather than reconstructing the year from memory and a folder of email receipts.

The Quarterly workbook ships with categories already set up for exactly this, so logging a purchase takes about fifteen seconds and the year-end totals build themselves.