Monthly Bookkeeping Checklist for Small Businesses

Every month, reconcile all bank and credit card accounts, review and follow up on invoices, pay bills on schedule, verify payroll, review your profit and loss statement, and back up your QuickBooks company file. Doing these tasks monthly takes a couple of hours — doing them once a year takes days.

Here's a tale of two business owners.

Owner A closes the books on the 5th of every month. Reconciled accounts, invoices sent, bills scheduled, reports reviewed. Takes her about two hours, and she always knows exactly where her business stands.

Owner B... doesn't. She "gets to it when she can," which means January. Every year, she spends a miserable week reconstructing twelve months of finances from bank statements, misses deductions she can't prove, and swears she'll do better next year.

Same business size. Same QuickBooks. Completely different outcomes. The only difference is a monthly checklist. Here's yours.

Table of Contents

1. Reconcile every bank and credit card account

This is the foundation everything else stands on. Compare your QuickBooks balances to your actual bank and credit card statements, line by line, for every account.

In QuickBooks Desktop: Banking > Reconcile.
Match every transaction. Investigate anything that doesn't match — don't just force it.
Unreconciled differences are where errors hide. Catch them now while they're fresh, not in December when nobody remembers what that $212 charge was.

2. Review uncleared and outstanding transactions

After reconciling, look at what's still outstanding: checks that haven't cleared, deposits in transit, pending charges. Most are normal. But a check that's been outstanding for three months? That's worth a phone call — it may be lost, and you may need to reissue it.

3. Send invoices and chase what’s overdue

Send invoices for all completed work promptly — ideally within days, not weeks.
Run your A/R Aging Summary (Reports > Customers & Receivables) and follow up on anything past due.
A simple rhythm: friendly reminder at 15 days overdue, firm follow-up at 30, phone call at 45. Consistent collections are one of the highest-ROI habits in business.

4. Review and pay your bills

Run the A/P Aging Summary to see what you owe and when it's due.
Pay on schedule — not early (that's free cash flow you're giving away), not late (that's late fees and damaged vendor relationships).
Look for anything odd: duplicate bills, price increases you didn't agree to, subscriptions you forgot you're paying for. Monthly bill review catches all of these.

5. Process and verify payroll

Confirm every employee was paid correctly — hours, rates, overtime, bonuses.
Check that payroll tax liabilities were calculated and deposited on time.
Reconcile your payroll liabilities account so what QuickBooks says you owe matches reality. Payroll mistakes compound fast, so [make reconciling payroll liabilities a monthly habit](/reconcile-payroll-liabilities-in-quickbooks/).

6. Review your profit and loss statement

This is the "so what" step. Pull your P&L for the month (Reports > Company & Financial > Profit & Loss Standard) and actually read it.

Compare revenue to last month and the same month last year. Any surprises?
Scan expenses for anything unusual or creeping upward.
Check your gross margin — is it holding steady? If it's sliding, you want to know now, not at tax time.

Ten minutes with your P&L every month is worth more than ten hours of year-end panic.

7. Check inventory (if you carry it)

If you sell physical products, do a quick inventory sanity check: does QuickBooks' inventory value roughly match what's actually on your shelves? Investigate big discrepancies — shrinkage, damage, and data entry errors all show up here.

8. Back up your QuickBooks company file

Monthly minimum. Weekly is better. Use File > Back Up Company > Create Local Backup, and keep at least one copy off-site or in the cloud. This takes five minutes and protects you from the one disaster that could erase years of records.

9. Review cash flow for next month

Look ahead, not just behind. Based on what's owed to you and what you owe, will next month be comfortable or tight? If a cash crunch is coming, you want three weeks of warning — not three days. A simple cash flow projection turns surprises into plans.

10. Close the month

Once everything above checks out, lock the month so nothing gets accidentally changed. In QuickBooks Desktop, you can set a closing date under Edit > Preferences > Accounting > Company Preferences > Set Date/Password. This keeps your reconciled months clean and your reports trustworthy — [here's a walkthrough of closing your books properly](/close-your-books-in-quickbooks-desktop/).

How long should all this take?

For a typical small business: two to four hours a month once you're in the habit. The first couple of months take longer as you build the routine. Compare that to the multi-day nightmare of catching up at year-end, and it's not even close.

Conclusion!

That brings us to the end of this guide on the monthly bookkeeping checklist for small businesses. We hope the checklist explained above helped you build a routine that keeps your books current, your cash flow visible, and tax season boring. If you run into any difficulty keeping up with it month after month, consider consulting a qualified and experienced QuickBooks professional for further assistance.

FAQs

What if I’m several months behind?

Start with the most recent month and work backward — recent transactions are easier to verify. Don't try to do it all in one sitting; knock out one month per session. The checklist works the same way, just repeated.

Do I really need to close every month?

You don't *have* to, but it's strongly recommended. A closing date prevents accidental changes to reconciled periods, which keeps your reports accurate. It takes thirty seconds and saves real headaches.

Should I do this myself or hire someone?

If the checklist takes you more than a few hours a month, or you're consistently skipping steps, that's your answer. The whole point of the routine is consistency — and consistency is exactly what a bookkeeper delivers.

What reports matter most each month?

Three: Profit & Loss (are you making money?), Balance Sheet (what do you own and owe?), and A/R Aging (who owes you money?). Everything else is detail work around those three.