If you file as a sole proprietor or a single-member LLC in the United States, your business income and expenses land on Schedule C. The form groups expenses into categories, and the fastest way to make tax time painless is to categorize each purchase the day you record it instead of sorting a year of receipts in April. This guide walks through the categories you will use most and the judgment calls that trip people up.
The categories you will use most
Advertising covers anything that promotes the business: ads, business cards, a sponsored post, printed flyers. Office expenses are the consumables that keep the office running, like paper, pens, and small items that are used up quickly. Supplies are materials consumed in delivering the work itself. The line between office expenses and supplies is blurry for many service businesses, so pick a rule and apply it consistently; your accountant cares more about consistency than about the perfect label.
Software and subscriptions is where recurring tools go: design software, hosting, email, project management, accounting. Web hosting and domains deserve their own category if the business sells online, because those costs are easy to forget and easy to prove. Legal and professional services covers your accountant, attorney, and consultants.
Meals are the category with the most rules. A meal usually has to involve business, be documented with who attended and why, and most of it is typically only partially deductible. Record the full amount, note the purpose, and let your preparer apply the right percentage. Travel is lodging, airfare, and transport away from your tax home; local driving is a car and truck expense instead.
Mixed-use purchases
A phone plan, a laptop, or an internet connection often serves both the business and your personal life. The clean approach is to record the whole amount and a business-use percentage for the entry, so the gross cost and the business portion are both visible. A reasonable, consistent percentage with a short note on how you arrived at it holds up far better than rounding everything to 100 percent.
Equipment that lasts more than a year, such as computers and cameras, may need to be depreciated or expensed under a special election rather than deducted outright. Put those purchases in an equipment category and let your accountant decide the treatment. What matters on your side is the date, the amount, and the receipt.
A simple year-round routine
Record each transaction within a day or two, while you still remember what it was for. Attach the receipt to the entry rather than to a folder. Categorize it on the spot. Once a month, filter for anything missing a receipt or still marked as needing review and clear the list. That routine takes a few minutes a week and produces a ledger your accountant can use without a single clarifying email.
At year end, export the ledger and the category totals. The category totals map almost line for line onto Schedule C, and the full ledger answers any question about an individual entry. If something does not fit a category, use the other-expenses line with a clear description rather than forcing it somewhere misleading.
This guide describes general practice, not advice for your situation. Confirm category treatment and deductibility with your tax preparer, especially for meals, mixed-use assets, and equipment.