How to Track Business Expenses as a Solo Contractor

Most solo contractors don't have a bookkeeper, and shoeboxes full of receipts are still more common than anyone wants to admit. Here's a simple system that doesn't require becoming an accountant.

Track expenses as they happen, not at month-end

The biggest reason expense tracking fails is waiting too long. A receipt photographed and logged on the spot takes ten seconds. The same receipt found crumpled in a truck door three weeks later is a lot more likely to get lost or forgotten entirely.

Separate business and personal spending

Even as a solo operator, use a dedicated card or account for business expenses. Mixing personal and business spending makes tax time significantly harder and makes it nearly impossible to see your real profitability.

Categorize consistently

Materials, fuel, tools, insurance, and subscriptions are common categories for most trades. Pick a consistent set and stick to it — inconsistent categorization (calling the same thing "supplies" one month and "materials" the next) makes your own reports harder to trust later.

Attach receipts to the record, not a separate folder

A photo of the receipt attached directly to the expense entry means you're never searching through email or a physical folder when you need proof — for taxes, warranty claims, or a customer dispute about materials cost.

Review monthly, not just annually

Waiting until tax season to look at your expenses means you can't react to anything — a subscription you forgot to cancel, a category that's grown unexpectedly. A five-minute monthly review catches problems while they're still small.

Why this actually matters for pricing

Expense tracking isn't just for taxes — it's the only way to know your real profit per job. Without it, you're pricing based on guesswork, and guesswork usually underestimates true costs by more than contractors expect.