Most contractors do their bookkeeping the same way they do their flossing: in a panic, right before someone with authority asks to see it. The result is a year-end scramble, a stressed accountant, a fat bill for cleanup work, and a nagging sense all year that the numbers might be lying to you.
There’s a better way, and it isn’t more bookkeeping, it’s less, done on a rhythm. It’s called the monthly close: a short, repeatable routine that locks down one month’s numbers so you can trust them and move on. Done right, it takes under two hours a month. This post is the routine.
What “closing the month” actually means
Closing a month means you’ve accounted for everything that happened in that month, reconciled it against reality (your bank and card statements), and produced numbers you’d be willing to make decisions on. Once a month is closed, you don’t touch it again. That “don’t touch it again” is the whole point, it’s what turns bookkeeping from an endless open loop into a series of finished, trustworthy chapters.
For a contractor, the close also answers the question that matters most: did I actually make money on the work I did, or did materials and overhead quietly eat the margin?
Before you start: the once-only setup
The monthly close only takes two hours if the foundation is in place. Spend an afternoon, once, getting these right:
- A separate business bank account and card. Non-negotiable. Mixing personal and business transactions is the single biggest cause of slow, expensive bookkeeping.
- A simple, consistent set of categories. Income, materials, subcontractors, fuel and vehicle, tools and equipment, insurance, software, and so on. Use the same ones every month.
- A place for receipts. A photo into a folder or app the moment money leaves your hand. The receipt you don’t capture in the field is the deduction you lose at tax time.
That’s the setup. Now the monthly routine.
The monthly close in under two hours
Block the same two hours every month, the first business day works well, closing the month just ended. Here’s the sequence.
1. Bring in every transaction (20 min)
Make sure every income and expense item for the month is recorded, whether your tool pulls them from the bank automatically or you enter them by hand. The goal is nothing missing.
2. Categorize everything (25 min)
Assign each transaction to one of your standard categories. Uncategorized transactions are the enemy; a number you can’t explain is a number you can’t trust. If something doesn’t fit, it usually means you need to look at it, not invent a new category.
3. Reconcile against the statement (30 min)
This is the step people skip and the step that makes the numbers real. Match your records against the actual bank and card statements for the month. The ending balance in your books should equal the statement to the penny. If it doesn’t, something is missing, doubled, or miscategorized, find it now, while the month is fresh, not in March of next year.
4. Handle invoices and bills (15 min)
Send any invoices you haven’t, and note what’s still owed to you. Glance at what you owe others. Cash that’s earned but not collected is still cash you’re waiting on, knowing the number is half of getting paid.
5. Read the two reports (20 min)
Pull the profit-and-loss for the month and a simple cash position. Then actually read them. Was this month profitable? Which jobs or categories moved the needle? Is anything trending the wrong way? This twenty minutes is the entire reason the other ninety exist.
6. Lock it and note one thing (5 min)
Mark the month closed. Write down one observation, “materials ran high on the Reyes job,” “still waiting on two invoices over 30 days.” Next month, you’ll thank yourself for the breadcrumb.
Why monthly beats yearly, every time
Doing this monthly instead of annually changes three things. Errors get caught while you still remember the transaction. Tax time becomes a printout instead of an excavation. And you get twelve chances a year to notice a problem early, a client who’s slow to pay, a category creeping up, a job that lost money, instead of one chance, too late to act on.
The contractor who closes monthly isn’t a better bookkeeper. They just stopped letting the work pile up.
A quick reference
- Bring in every transaction.
- Categorize all of them.
- Reconcile to the bank and card statements to the penny.
- Send invoices, note what’s owed and owing.
- Read the profit-and-loss and cash position.
- Lock the month and jot one observation.
Want the system, not just the routine?
The Villex Co Bookkeeping Starter Kit gives you the foundation this routine sits on, a ready-made chart of accounts, an expense tracker, and a month-end close checklist you can run in under two hours from day one, even if you’ve never closed a month before.
One practical post for service-business owners every two weeks. Get on the list →
Results will vary. For educational purposes only, not legal, tax, or financial advice. Bookkeeping and tax requirements vary by jurisdiction and situation; consult a qualified accountant or tax professional about your specific circumstances. © 2026 Villex Entreprises LLC.
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Bookkeeping Starter Kit
A starter kit for new business owners who keep finances in their head, chart of accounts, expense tracker, and month-end close checklist.
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