Operations
The Contractor Bookkeeping Guide: Start Simple, Stay Organized
Bookkeeping is the business habit most contractors skip until it hurts. The tax bill is higher than expected, the account balance does not match reality, or an audit request arrives and there is no documentation. None of these are fatal — but all of them are preventable with 15 minutes per week.
Why bookkeeping matters before you think it does
Most new contractors delay bookkeeping because they think it is something you need once the business "gets bigger." The opposite is true — the habits you build in month one determine whether you have clean records in year one. Catching up on a year of undocumented transactions takes 10 times longer than logging them as they happen.
Beyond tax preparation, bookkeeping tells you which jobs are profitable, which expenses are growing, and whether your cash flow can support the next investment. Without it, every financial decision is a guess.
The contractors who grow without financial stress are not making more money — they are tracking it. That visibility changes how you make decisions.
Setup: what you need on day one
1. Separate business bank account
Open a dedicated business checking account. Never mix personal and business transactions. This is non-negotiable — it protects your LLC liability shield and makes every other bookkeeping step easier.
2. Business credit or debit card
Run all business purchases through one card linked to your business account. This creates an automatic paper trail for materials, fuel, tools, and supplies without manual entry.
3. Bookkeeping software
Wave (free) or QuickBooks Simple Start ($15-$30/month) are the two best options for solo contractors. Both connect to your bank account, categorize transactions, and generate the reports your accountant needs. Start with Wave if cost matters — upgrade when you need payroll or job costing.
4. Receipt capture system
Take a photo of every cash receipt the day you get it. Use your phone camera, a notes app, or a dedicated app like Dext. Paper receipts fade and get lost. Digital receipts survive audits.
The weekly bookkeeping routine (15 minutes)
Pick the same day each week — most contractors use Sunday evening or Monday morning — and do these three things:
Review and categorize all bank transactions from the past week
Log any cash expenses and attach receipt photos
Check that your software balance matches your actual bank balance
Pro tip: If your bank-linked software auto-categorizes most transactions, your weekly task is just reviewing the auto-categories and fixing the ones it got wrong. This takes 5-10 minutes once you have a few weeks of history.
Common contractor expense categories
| Category | Examples | Deductible? |
|---|---|---|
| Materials | Pipe, wire, lumber, paint, parts | Yes — cost of goods sold |
| Vehicle | Fuel, maintenance, insurance, payments | Yes — mileage or actual expenses |
| Tools and equipment | Power tools, hand tools, safety gear | Yes — expense or depreciate |
| Insurance | General liability, workers comp, vehicle | Yes |
| Phone and internet | Business phone, mobile data, internet | Yes — business use percentage |
| Software | CRM, scheduling, bookkeeping tools | Yes |
| Licensing | Trade license, permits, certifications | Yes |
| Education | Continuing ed, code updates, training | Yes |
This list is for general reference. Tax deductibility depends on your specific situation, entity type, and state. Consult a tax professional for advice on your deductions.
The monthly check-in (30 minutes)
Once per month, add these steps to your weekly routine:
- -Review your P&L report. Revenue, expenses, and net income for the month. Is your margin where you expect it?
- -Check accounts receivable. Who owes you money? How old are the invoices? Follow up on anything over 30 days.
- -Set aside estimated taxes. Move 25-30% of net income into a separate savings account for quarterly estimated tax payments. This prevents the annual tax surprise.
Key takeaways
Separate your finances on day one
Business bank account and business card. No exceptions.
15 minutes per week prevents chaos
Categorize transactions weekly. Do not let them pile up.
Set aside taxes monthly
25-30% of net income into a separate account. Pay quarterly estimates.
Capture every receipt digitally
Paper fades and gets lost. Phone photos survive audits.
What I have learned about contractor bookkeeping
The contractors who hate bookkeeping the most are always the ones who let it pile up. When you face a year of unsorted receipts and unreconciled transactions, of course it is miserable. When you face a week of 10-15 transactions that your software already categorized, it takes less time than scrolling social media.
The ones who get it right treat bookkeeping like brushing their teeth — a small weekly habit, not an annual project. They know their margins, they never get surprised by a tax bill, and they can make investment decisions based on real numbers instead of gut feelings.
Start this week. Open the free software, connect your bank, and categorize what is there. The setup takes 30 minutes. The weekly habit takes 15. The clarity it provides is worth hours of guessing.
-- Richard