Every bookkeeping task solopreneurs dread comes back to the same underlying question: what category does this go in? Categorization sounds simple, but it's where most DIY bookkeeping goes sideways. Good categorization means cleaner monthly reports, bigger (legitimate) deductions, and a CPA who doesn't send you panicky emails in March.
Here's how to think about it.
Why categorization matters more than you think
When you categorize an expense in QuickBooks (or any bookkeeping system), you're doing two things at once. First, you're grouping similar expenses so your monthly P&L actually tells you something useful — “software” is more useful than a pile of individual subscriptions. Second, you're setting up your tax return — most categories map directly to a line on Schedule C or your business return.
Miscategorization is the single most common reason bookkeeping feels chaotic. If a $200 Zoom subscription gets split across “Office Supplies,” “Software,” and “Professional Services” over the course of a year, your reports become useless and your tax prep becomes guesswork.
The fix is choosing a category for each type of expense once, and then applying it consistently. Boring but effective.
The categories that cover 90% of solopreneur expenses
Most solopreneurs can handle their bookkeeping with about 15-20 expense categories. Here are the ones that cover nearly everything:
Advertising & Marketing — Facebook ads, Google ads, business cards, website hosting used for marketing pages, marketing consultants.
Software & Subscriptions — QuickBooks, Zoom, Adobe, Dropbox, Canva, any monthly or annual software for the business.
Office Supplies — Printer paper, pens, notebooks, small physical supplies. If it's physical and under about $500, it probably goes here.
Office Equipment — Laptops, monitors, printers, desks, chairs. Anything over about $500 that lasts more than a year goes here and may need to be depreciated rather than deducted all at once.
Contractors & Professional Services — Payments to other freelancers, your CPA, your attorney, your bookkeeper. Anyone you pay $600+ in a year needs a 1099 at year-end.
Home Office — If you have a dedicated home office space, a percentage of rent/mortgage interest, utilities, and internet. See below for the rules.
Travel — Flights, hotels, rental cars, Ubers for business trips. Not your daily commute.
Meals — Business meals with clients or during travel. Currently 50% deductible. Keep notes on who you met with and why.
Vehicle / Mileage — If you use your car for business, you can either track actual expenses or take the standard mileage rate (currently around 67 cents per mile). Pick one method and stick with it.
Phone & Internet — The business percentage of your phone and internet bills.
Insurance — Business liability, professional liability, health insurance if you're self-employed.
Bank & Payment Processing Fees — Stripe, PayPal, bank account fees, wire transfer fees. These add up and are fully deductible.
Education & Training — Courses, conferences, books, professional development directly related to your current business.
Licenses & Permits — Annual business registration, professional licenses, local permits.
Dues & Memberships — Professional organizations, industry associations.
That's 15 categories. For most solopreneurs, this is enough. If you find yourself creating a 30th category for one weird transaction, you're probably overcomplicating it.
The home office deduction: worth doing, with rules
The home office deduction is one of the biggest opportunities solopreneurs miss or mess up.
The space must be used regularly and exclusively for business. A spare bedroom that's also the guest room and where your kid does homework doesn't qualify. A dedicated room or clearly separated area used only for work does qualify.
You have two methods to calculate it. The simplified method is $5 per square foot, up to 300 square feet (so $1,500 max). The regular method calculates the actual percentage of your home used for business and applies that to your real expenses. The regular method is more work but usually results in a bigger deduction.
Keep documentation. Measure the square footage. Save the paperwork. If you're ever audited, the IRS will want to see this.
Mileage: track it or lose it
If you use your car for business at all, you need to track mileage. Not tracking it means leaving money on the table — every business mile is worth about 67 cents as a deduction.
The easiest way is a free app like MileIQ or Stride that runs in the background on your phone and lets you swipe business or personal on each trip. Less easy but also fine: a paper log or spreadsheet where you write down date, destination, purpose, and miles for every business trip.
What you can't do is reconstruct mileage at the end of the year by guessing. The IRS has rejected claimed mileage in audits specifically because the taxpayer couldn't show contemporaneous records.
The “personal use of business account” problem
If you run personal expenses through a business account, every one of those transactions needs to be categorized as an Owner Draw (or Distribution, depending on your business structure) — not as a business expense. This is one of the most common errors in DIY bookkeeping.
The fix going forward is simple: don't mix. Use business accounts for business, personal accounts for personal. Pay yourself a regular amount from the business to the personal account, and treat that transfer as an Owner Draw.
When in doubt, err toward simple
The IRS and your CPA both prefer consistent simplicity over creative categorization. The goal of categorization isn't perfection — it's creating books you can actually use and a return you can actually file. Consistent-and-close beats perfect-but-never-finished every single time.
When it's worth hiring this out
Most solopreneurs can categorize their own expenses with this framework. You should consider hiring it out if:
- Your transaction volume is getting high (100+ per month)
- You have inventory, contractors, or multiple revenue streams
- You've been miscategorizing and want a clean slate
- You just don't want to, and can afford not to
If any of that describes you, a free 20-minute consultation is a good way to figure out whether monthly bookkeeping makes sense for your situation.