How to Categorize a Business Expense (Even If You're Not an Accountant)

You just paid for something for your business, and now you’re staring at a dropdown list of thirty or forty expense categories in your bookkeeping app, trying to guess which one it wants. Office supplies? Software? Other? You pick one, move on, and quietly wonder if you just guessed wrong.

Here’s the good news.

The one test that decides almost everything

Before you worry about which category, ask one question first: was this expense for the business, and would a reasonable business owner in your situation have paid it to earn income?

In the US, the IRS calls this the “ordinary and necessary” test. Ordinary means common and accepted in your trade or business. Necessary means helpful and appropriate for it — not that it was unavoidable. A graphic designer buying a drawing tablet passes easily. A graphic designer buying a lawnmower does not, unless they can explain why their business needed it.

In Canada, the CRA’s version is simpler to say but does the same job: you can deduct any reasonable current expense you incur to earn business income. “Current” is the key word — it separates a $40 pack of printer paper (deduct it now) from a $2,000 laptop (a capital asset, depreciated over time instead of deducted all at once).

If an expense fails this test, no category will save it. If it passes, the category you pick mostly affects how your tax return is organized, not whether the deduction is valid.

A short, stable category list — mapped to the form you file

Software marketing pages love long lists because more categories look more thorough. In practice, almost every small business expense lands in one of these buckets. Here’s how they map to the actual line on your tax form.

*Canada doesn’t have a separate “contract labor” line the way the US does — most self-employed people report what they pay contractors under professional fees or salaries and wages, depending on the relationship.

Pin this table somewhere, or better, use it to set up a short chart of accounts once. You shouldn’t have to re-decide “which category is this?” from scratch every single time. (If you sell physical products, cost of goods sold is its own separate line, not part of this list — see our guide to cost of goods sold.)

The gray areas people actually get stuck on

Meals. Both countries cap this the same way: only 50% of client and business meals are deductible, not 100%. You have to actually discuss business, and you need to be present. A meal with no business purpose is a personal expense, full stop, no matter whose card it’s on.

Home office. In the US, you can either track actual home expenses on Form 8829, or use the simplified method: $5 per square foot of office space, up to 300 square feet (a $1,500 cap). In Canada, the CRA has you calculate the business-use percentage of your home — usually workspace square footage divided by total home square footage — and apply that percentage to your home costs with the work-space-in-home worksheet. One CRA-specific catch: this deduction can’t create or increase a business loss; any unused amount carries forward to next year.

Vehicle use. Track business mileage separately from personal driving — a simple notebook or app log is enough, but it has to exist if the CRA or IRS ever asks. For 2026, the IRS standard mileage rate is 72.5 cents per mile for January through June, rising to 76 cents per mile for July through December. If you’d rather deduct actual costs (gas, insurance, repairs, prorated by business-use percentage), that’s allowed too — just pick one method and keep the records to back it up.

Paying a contractor. One change worth knowing for 2026: the threshold for when a US business must send a contractor a Form 1099-NEC jumped from $600 to $2,000 for payments made in 2026 and after, under the One Big Beautiful Bill Act. If you paid a freelancer less than $2,000 this year, you likely don’t need to file a 1099 for them — but you still record the expense the same way either way. The 1099 rule is a reporting requirement, not a deduction requirement.

When a category genuinely isn’t clear

Sometimes an expense really could go two places — a subscription that’s half project-management tool, half accounting software, say. In that case, pick the closer fit, apply it consistently going forward, and don’t lose sleep over it. Categories exist to keep your books organized and your tax return accurate, not to be a test you can fail on a technicality. Getting this right also keeps your trial balance easier to review, since consistent categorizing is what makes month-to-month numbers comparable.

Where it’s not a judgment call anymore — a big equipment purchase that might need to be depreciated instead of deducted outright, or a payment that touches payroll tax — that’s the point to loop in a CPA or tax preparer. This kind of plain-English categorizing gets you organized and confident in your own numbers, and it fits naturally into your year-end tax prep. It isn’t a substitute for licensed tax advice on the edge cases, and it isn’t meant to be.

This is practical education, not tax or legal advice. For questions about your specific return, talk to a licensed CPA, tax advisor, or your accountant.