The Complete Guide to IRS Schedule C Expense Categories for Freelancers in 2026
Filing as self-employed in the US means your business expenses flow into Schedule C, Part II — twenty numbered lines that determine your taxable income. Here is exactly what belongs on each one, the categories that confuse people every single year, and the three classification mistakes I see most often when people send me their categorized reports.
Every time I see a freelance friend file their taxes for the first time, the same thing happens. They open Schedule C, scroll down to Part II, and freeze. There are twenty different expense lines, the IRS instructions for each one read like they were written by lawyers (because they were), and the difference between "Office Expenses" (Line 18) and "Supplies" (Line 22) looks like it requires a master's degree in semantics. So they end up dumping everything into "Other Expenses" (Line 27a), which is exactly the line that draws audit attention when it gets large. This guide is the breakdown I wish someone had given me when I started building this tool — every Schedule C line, what actually belongs there, and where most people get it wrong.
The structure of Schedule C, Part II
Schedule C separates expenses into twenty categories, numbered from Line 8 (Advertising) through Line 27a (Other Expenses). The IRS instructions are not exhaustive — they list "examples" of what belongs in each category but the categories themselves are defined more by tradition and audit history than by any clean taxonomy. This is what makes it confusing. Here is the full list, with my plain-English notes for each:
Line 8 — Advertising
Anything you pay to bring in customers. Google Ads, Facebook Ads, LinkedIn Ads, Reddit promoted posts, sponsorships, business cards, branded merchandise, billboards, podcast sponsorships, influencer payments, paid email newsletter placements, and the recurring fee for a SEO tool like Ahrefs or SEMrush all live here. The line nobody draws correctly: your website hosting and domain are NOT advertising — those go on Line 27a (Other Expenses) under "software and online services". I see people put their entire $14/month Squarespace bill under Advertising every year. It is not. Squarespace hosts the site; the site itself might advertise your services, but the hosting fee is operating cost, not advertising spend.
Line 9 — Car and Truck Expenses
If you use a vehicle for business, you have two ways to deduct it: the standard mileage method (67 cents per business mile in 2025, adjusted annually) or the actual expense method (gas, insurance, maintenance, depreciation, lease payments — multiplied by your business-use percentage). You pick one method in the first year you use the car for business; if you start with standard mileage you can switch later, but if you start with actual expenses you are locked in. For rideshare drivers and delivery couriers, standard mileage almost always wins, because the IRS rate is generous and you avoid the depreciation paperwork. For sales reps and consultants who drive a luxury vehicle infrequently, actual expenses sometimes wins. Either way, you need a mileage log — apps like MileIQ or Stride track it automatically.
Line 10 — Commissions and Fees
Money paid to non-employees who help you generate revenue. Sales commissions to affiliates, referral fees to other freelancers who send you clients, broker fees, agent commissions for booking gigs. This is NOT where you put PayPal, Stripe, or Square payment processing fees — those are bank fees and go under Line 27a. The line that gets misused: many people stick "platform fees" here (the cut Etsy, Fiverr, or Upwork takes from each sale). That is technically defensible but most accountants prefer those go under Line 27a as "platform / marketplace fees", because they are not really commissions you paid to someone — they are gross-to-net adjustments by a platform.
Line 11 — Contract Labor
Payments to other independent contractors who did work for your business. If you paid a freelance designer $2,000 to build your logo, or a VA $500/month to handle email, that goes here. Critical rule: if you paid anyone $600 or more in the year, you must issue them a 1099-NEC by January 31st. The IRS cross-checks Line 11 against 1099-NECs filed in your name as the payer. If your Line 11 says $50,000 but you only filed two 1099s totaling $20,000, expect a letter.
Lines 13 and 14 — Depreciation and Employee Benefit Programs
Line 13 is depreciation on assets — a computer over $2,500, business furniture, or a vehicle if you took actual expenses. The Section 179 deduction lets most freelancers expense the full cost in the year of purchase instead of depreciating, up to fairly generous limits. Line 14 is employee benefits, which only applies if you have W-2 employees — most solo freelancers ignore this line entirely.
Line 15 — Insurance (other than health)
Professional liability insurance, errors and omissions (E&O), general liability, cyber insurance, business property insurance, business auto insurance (if you took actual expenses on Line 9). Health insurance for yourself does NOT go here — it is a personal deduction, taken as an "adjustment to income" on Schedule 1 of Form 1040, not on Schedule C.
Lines 16a and 16b — Interest
16a is mortgage interest on business property. 16b is other business interest — credit cards used for business, business loans, lines of credit. If you use a credit card for both personal and business, only the interest attributable to business charges is deductible. Track this separately or use a dedicated business credit card; nobody wants to reconstruct it later.
Line 17 — Legal and Professional Services
Lawyer fees, accountant fees, bookkeeper fees, tax preparer fees, business consultant fees. If your accountant prepared both your business return and your personal return, only the business portion is deductible here — most accountants will itemize their invoice so you can split it cleanly.
Line 18 — Office Expense vs Line 22 — Supplies (the big one)
This is the categorization mistake I see most often. The IRS does not give a hard rule, but the working distinction every accountant uses is: Office Expense (Line 18) is the general overhead of having an office — printer paper, pens, sticky notes, ink, postage, file folders. Supplies (Line 22) is materials directly consumed in producing your service or product — for a photographer, that is memory cards and lens cleaning kits; for a baker, that is flour and packaging; for a contractor, that is screws and lumber. If you cannot decide, ask: "did I use this thing up in the course of delivering my work, or did I use it to run my office?" Used-up-in-work goes on 22, runs-the-office goes on 18.
Lines 20a and 20b — Rent or Lease
20a is rent for vehicles, machinery, and equipment. 20b is rent for "other business property" — office space, coworking memberships, storage units used for inventory, and per the IRS, even your home office IF you elected the regular method instead of the simplified method. If you use the simplified home office method ($5 per square foot, max 300 sq ft = $1,500), it goes on Line 30 instead of Line 20b. The regular method gives you actual expenses on Line 30 but routes some of the components through Line 20b. Most people should just use the simplified method unless their home office is large and their actual costs are clearly higher than $1,500.
Line 21 — Repairs and Maintenance
Repairs that keep business property in working order — fixing a printer, servicing your business vehicle (if you took actual expenses), patching a roof on a commercial property. Upgrades that extend the useful life or increase the value of the property are not repairs; those have to be depreciated.
Line 23 — Taxes and Licenses
State and local business taxes, business licenses, professional licenses (real estate, contractor, cosmetology), permits, regulatory fees. Federal income tax and self-employment tax do NOT go here — those are not business expenses, they are the tax on the business's profit. Sales tax you collected and remitted to the state does not go here either; that flowed through your gross receipts already.
Lines 24a and 24b — Travel and Meals
24a is travel — flights, hotels, rental cars, taxis, Ubers, baggage fees, when you are away from your "tax home" overnight for business. 24b is meals — 50% deductible in nearly all cases. The exception is meals at a company-wide event open to all employees (100% deductible) but solo freelancers basically never use that exception. The categorization tool I built deducts meals at 100% in the working spreadsheet so you can see the gross amount, but the export to Schedule C automatically applies the 50% rule.
Line 25 — Utilities
Electricity, gas, water, sewage, trash for your business location. Your cell phone bill is utility-adjacent and can go on Line 25 OR Line 27a — most accountants prefer Line 25 for the business-use portion of phone and internet because those are utilities by nature. If you work from home and use the simplified home office method, the home portion of utilities is already baked into that deduction; do not double-deduct.
Line 26 — Wages
W-2 wages paid to employees. If you are a single-member LLC owner paying yourself, you are not an employee — your own draws do not go anywhere on Schedule C. If you have actual W-2 employees, this is where their gross wages live.
Line 27a — Other Expenses (the catch-all that flags audits when oversized)
Software subscriptions, online services, education courses, professional books, conference fees, payment processing fees (Stripe, Square, PayPal), platform fees (Etsy, Upwork, Fiverr), website hosting, domain names, bank fees, client gifts (capped at $25/recipient/year), dues and subscriptions to industry publications. The IRS flags Schedule Cs where Line 27a is disproportionately large compared to revenue — if 60% of your expenses are in "Other", you look like someone hiding things. The fix is not to lie about it; the fix is to push items into their correct named categories. Software subscriptions could arguably go under Office Expense (Line 18) if you wanted to thin out Line 27a, and some accountants prefer that.
The three classification mistakes I see most often
(1) Lumping everything under "Other Expenses" (Line 27a). This is the audit-magnet move. If Line 27a is more than 30–40% of your total deductible expenses, restructure. Move software into Office Expense, move bank fees out where they belong, and Line 27a should drop to a reasonable size.
(2) Confusing personal and business use. If you bought a $1,200 laptop and use it 70% for business and 30% for personal browsing, you deduct $840 — not $1,200. The IRS allows partial deductions; lying about it is what they prosecute. Same logic applies to your phone bill, internet, car, and any other mixed-use asset.
(3) Deducting personal health insurance on Schedule C. The self-employed health insurance deduction is real, but it does NOT live on Schedule C. It is an adjustment to income, taken on Schedule 1, Line 17. Putting it on Schedule C Line 15 understates your Schedule C net profit and breaks the downstream self-employment tax calculation.
Bottom line
If you take one thing from this: the IRS does not really care which of two defensible categories you pick, as long as the total deductible amount is correct, the categorization is consistent year over year, and Line 27a does not balloon into a black hole. The goal of categorization is not perfection — it is defensibility. Pick one reasonable home for each merchant, stick with it next year, keep your receipts, and you will be fine.
Try it: Upload your bank statement to the free expense categorizer on the home page. Every transaction gets mapped to one of these Schedule C lines automatically, and you can adjust any classification in one click before exporting.