Business expense categories: the list and how to use it

Small business expense categories list

Use these as your categories, rename them to match your accountant's chart of accounts, and drop the ones you never use. The last column shows where each total usually goes on the US Schedule C (Form 1040), using the 2025 form's line numbers.

This is general information, not tax advice. Rules on what is deductible, and how much, depend on your country and situation — check with your tax preparer when in doubt.

Transactions that aren't expenses

When you categorize bank transactions for taxes, the most common mistakes aren't wrong expense categories — they're things counted as expenses that aren't. Give these their own categories so they stay out of your totals:

• Transfers between your own accounts, including moving money to savings.
• Credit card payments. The purchases on the card are the expenses; the payment from checking just moves money. Categorize the card statement instead.
• Loan principal. Only the interest part of a loan payment is an expense.
• Owner's draws and personal spending from the business account.
• Sales tax or VAT you collect and pass on to the tax authority.
• Loan proceeds and owner contributions on the income side — they aren't revenue.

Expense categories for self-employed people

Sole proprietors and freelancers use the same list, usually shorter: advertising, travel, software, phone and internet, professional fees and supplies cover most of it. Two items cause the most confusion.

Mixed-use costs — a phone, a car or internet used for both work and personal life — are deductible only for the business share, so keep a note of the percentage. Working from home has its own line on Schedule C (line 30, business use of your home), so don't fold rent or a mortgage payment into Rent or lease. In the US, your own health insurance as a self-employed person is generally deducted elsewhere on the return, not on line 15.

UK: the SA103 expense categories

In the UK, self-employed people report allowable expenses on the self-employment pages of the Self Assessment return. The short version, SA103S, has nine expense boxes, and mirroring them in your categories makes the return a copy-and-paste job:

• Costs of goods bought for resale or goods used
• Car, van and travel expenses
• Wages, salaries and other staff costs
• Rent, rates, power and insurance costs
• Repairs and maintenance of property and equipment
• Accountancy, legal and other professional fees
• Interest and bank and credit card financial charges
• Phone, fax, stationery and other office costs
• Other allowable business expenses (advertising, subscriptions and the like; client entertaining is not allowable)

On the 2026 SA103S, a business with annual turnover below £90,000 may enter just the total expenses instead of each box. You can't claim expenses at all if you use the £1,000 trading allowance. GOV.UK explains what counts in each category in expenses if you're self-employed.

How to categorize bank transactions for taxes

1. Collect every business account for the full year — checking, savings and each credit card — so that nothing is counted twice or missed.
2. Get the transactions into one spreadsheet. Download CSV files from your bank, or convert the PDF statements to Excel and combine them into one file.
3. Mark the non-expenses first: transfers, card payments, loan principal and owner's draws.
4. Sort by payee and categorize in groups. Thirty rows of the same supplier take one decision, not thirty.
5. Split mixed transactions — an online order with both business and personal items — and note the business purpose of meals and travel.
6. Total by category with a pivot table or SUMIF, and give the totals plus the detail to whoever prepares the return.

Can categories be assigned automatically?

Yes — bank feeds in accounting software suggest categories, and a converter can do it before the data ever reaches a spreadsheet. Bank Statement Categorizer gives each transaction a clean payee name and a category from your own list as it reads the statement. You can rename, add or remove categories; when you correct one, you can turn it into a rule ("description contains X → category") so the same payee is categorized the same way on every future statement. Rules always win; everything else is categorized by AI.

The Excel export includes a Summary sheet with totals by category and by month, which is usually exactly what a tax preparer asks for. Review the categories before you rely on them — automatic categorization saves the typing, not the judgement about what's deductible.

Keep the list stable

Whatever list you choose, keep it the same from year to year so totals can be compared, and agree it with your accountant once rather than re-inventing it every spring. If you prepare returns for several clients, see bank statements for tax preparation; if you run the business yourself, bank statement tools for small business covers the monthly routine.

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