How to Track Business Expenses as a Solopreneur

Most expense tracking advice assumes you're happy to log every receipt manually and reconcile everything at month-end. Most solopreneurs aren't. And they shouldn't have to be.

Here's the system that works in practice — mostly automated, accurate records, and everything your tax advisor needs come tax time.

This is general educational information, not tax advice. Talk to your tax advisor about documentation requirements specific to your situation.

TL;DR

The system is simple. One dedicated business account for all expenses. A bookkeeping tool with automatic bank sync so nothing gets missed. A handful of categories that actually matter. A monthly 15-minute review.

The goal isn't a perfect paper trail. It's accurate records that are already organized when your tax advisor asks for them — without spending hours getting there.

Table of Contents

• Step 1: Separate business and personal money

• Step 2: Connect to a tool with automatic bank sync

• Step 3: Know your categories

• Step 4: Handle receipts the right way

• Step 5: Review once a month — not more

• What not to do

• FAQ

Step 1: Separate Business and Personal Money

One dedicated business bank account. One dedicated business card. Every business expense goes through them. Nothing personal.

This single structural change eliminates most of the mess that makes expense tracking painful. When everything is mixed in one account, you're manually sorting personal from business at year-end. When they're separate from day one, your bookkeeping tool does the sorting automatically.

Relay and Mercury are both clean, fee-free options for U.S. solopreneurs that connect directly to Cashflowy via Plaid.

Step 2: Connect to a Tool With Automatic Bank Sync

Manual categorization at $100,000 in annual revenue takes 2–4 hours a month. It's also unnecessary.

Cashflowy connects to your business bank accounts and credit cards via Plaid — 12,000+ US banks supported — and categorizes transactions automatically as they come in. Income, operating expenses, and deductible costs. No CSV uploads, no manual entry.

Clara AI, Cashflowy's built-in financial coach, can recategorize anything that was incorrectly tagged in seconds. And if you want a human to review your transaction history, just ask — human bookkeeper access is included at no extra charge, available any time you need them.

Step 3: Know Your Categories

You don't need a complex chart of accounts. You need the categories that actually affect your taxes and your operating expense percentage.

Cashflowy tracks all of these automatically and shows your operating expense percentage against revenue in real time. If expenses are running above 35% of Real Revenue, that's the signal to review. Talk to your tax advisor about which of these categories are deductible for your specific situation.

Step 4: Handle Receipts the Right Way

This is simpler than most solopreneurs think.

Under $75: A bank or credit card statement is generally sufficient IRS documentation. You don't need to keep the receipt for most expenses below this threshold.

Over $75: Keep a receipt or invoice. Digital is fine — a phone photo works. Attach it to the transaction in Cashflowy or keep a dated digital folder.

Travel, meals, home office: Maintain extra documentation. For meals: who was there and the business purpose. For home office: square footage of the dedicated space versus total home square footage. For travel: business purpose and dates.

Talk to your tax advisor about documentation requirements specific to your business. IRS rules can change, and your situation may have specific requirements beyond these general guidelines.

Step 5: Review Once a Month — Not More

A monthly review of your expenses takes 15 minutes when the system is running. What to look at:

• Any transactions categorized incorrectly?

• Are operating expenses above 35% of revenue?

• Any subscriptions unused in the past 30+ days?

• Any contractor payments over $600 that will need a 1099-NEC at year-end?

If you want a human to walk through your books with you, just ask your Cashflowy bookkeeper — included at no extra charge, no limit on how often you reach out. You can also ask Clara AI directly: "What were my top three expense categories last month?" or "Are my operating expenses running high?"

For the full list of which expenses are actually deductible in 2026, see the list of business expenses that are actually deductible in 2026.

What Not to Do

Don't track in a spreadsheet above $40K in revenue. The manual entry time, formula risk, and lack of bank sync make it a liability. The time spent maintaining it costs more than a bookkeeping tool.

Don't wait until tax season to categorize. Retroactive categorization is the painful version of this. Real-time tracking takes no additional effort and produces better records.

Don't mix cash transactions into a system that's mostly bank-synced. If you occasionally pay for business expenses in cash, log them immediately — a note in your bookkeeping tool with the amount, category, and purpose. Don't let them disappear.

Frequently Asked Questions

How do solopreneurs track business expenses?

The most effective system: one dedicated business card for all expenses, a bookkeeping tool with automatic bank sync and categorization, and a monthly 15-minute review. Cashflowy handles the categorization automatically. Human bookkeeper access is included at no extra charge — available whenever you need a second set of eyes on your books.

Do I need to keep every receipt as a solopreneur?

Not always. For most expenses under $75, a bank or credit card statement is generally sufficient IRS documentation. For expenses over $75, keep a receipt or invoice — digital is fine. Travel, meals, and home office expenses need additional documentation of business purpose. Talk to your tax advisor about documentation requirements specific to your situation.

What is the best way to track business expenses for taxes?

Automatic bank sync with real-time categorization — so expenses are recorded as they happen, not retroactively reconstructed at year-end. Cashflowy categorizes transactions automatically and produces a year-end expense report by category for your tax advisor. See the complete solopreneur bookkeeping guide for the full setup.

How do I know if my expenses are too high?

For a US service solopreneur with no subcontractors, operating expenses should run 25–35% of Real Revenue. Above 40% is a signal worth looking at. Cashflowy shows your operating expense percentage against revenue in real time on your dashboard. Clara AI can tell you your top spending categories and flag anything that looks off — ask.

Which expense categories should solopreneurs use?

The core categories: software and tools, contractor fees, marketing and advertising, professional development, professional services (tax advisor, attorney), home office, phone and internet, business insurance, travel and meals, and banking fees. Track these consistently all year. Your tax advisor can confirm which apply to your specific business and situation.