Bookkeeping/Monthly Checklist

Monthly Bookkeeping Checklist for Small Business

Eight sections, every month. Run this checklist and your books stay reconciled, tax-ready, and useful for actual decisions. Built for small businesses doing $100K to $1M+ in revenue.

Download the PDFHave us run it for you

Why a monthly close matters

Most small business owners do not get burned by complex accounting. They get burned by skipped months. A reconciliation missed in March turns into four hours of detective work in September, and by tax season it is a CPA cleanup invoice.

The fix is a repeatable monthly process. Same steps, same order, every month. Do it yourself or hand it to a bookkeeper, but never let a month go uncalled. The checklist below is what we run for our own clients inside QuickBooks Online.

1. Reconcile Every Account

  • Reconcile every business checking account against the bank statement.
  • Reconcile every business credit card against the statement.
  • Reconcile merchant processors (Stripe, Square, PayPal) against deposits.
  • Investigate and resolve any uncleared transactions older than 30 days.

2. Categorize and Clean Transactions

  • Review every uncategorized transaction in QuickBooks Online.
  • Confirm vendor names are consistent (no duplicates from auto-import).
  • Split mixed-purpose transactions where needed.
  • Flag and reclassify anything that looks miscategorized.
  • Attach receipts to any transaction above your documentation threshold.

3. Accounts Receivable

  • Pull an A/R aging report.
  • Send reminders for invoices 15+ days past due.
  • Escalate or schedule a call for invoices 45+ days past due.
  • Write off uncollectible invoices following your bad-debt policy.

4. Accounts Payable

  • Pull an A/P aging report.
  • Confirm all approved bills are scheduled or paid.
  • Verify recurring vendors (rent, software, utilities) hit on schedule.
  • Match bills to POs or contracts where applicable.

5. Payroll and Contractor Sync

  • Confirm payroll run posted correctly to the GL.
  • Verify employer taxes, benefits, and retirement contributions are booked.
  • Reconcile contractor payments and track toward 1099 thresholds.

6. Sales Tax and Compliance

  • Pull sales-tax liability report by jurisdiction.
  • File and pay any sales tax due this month (NY/NYC if applicable).
  • Review nexus exposure if you sell in multiple states.

7. Review the Financials

  • Generate Profit and Loss for the closed month and YTD.
  • Generate Balance Sheet as of month-end.
  • Generate Cash Flow Statement for the month.
  • Compare actuals to budget or prior period; note material variances.
  • Write a short note explaining anything unusual (one paragraph is enough).

8. Close the Month

  • Lock the books for the closed period in QuickBooks Online.
  • Back up reports to your secure document folder.
  • Update your owner dashboard or KPI tracker.
  • Schedule a 30-minute review with your bookkeeper, advisor, or yourself.

What changes when you actually run the checklist

Three real client situations, anonymized. Same QuickBooks Online file, same business, before and after a consistent monthly close.

Brooklyn coffee roaster

Owner was nine months behind on reconciliations

Before
  • Bank and Square deposits not tied out since Q1
  • P&L showed a 22% gross margin that the owner did not trust
  • Year-end CPA quoted a four-figure cleanup before filing
After 90 days on the checklist
  • Every account reconciled monthly within 10 business days of close
  • True gross margin landed at 31% once merchant fees were properly coded
  • Owner walked into tax season with a clean trial balance and no cleanup invoice

"I stopped guessing what I made. Now I look at the close report on the 12th and price the next quarter from it."

Queens HVAC contractor

Cash kept disappearing between strong months

Before
  • Job deposits sat in undeposited funds for weeks
  • Sales tax filings were filed from memory, not from the books
  • Owner pulled draws without knowing what the business actually had
After 90 days on the checklist
  • Weekly bank feed review plus monthly close caught a duplicated vendor entry costing $1,400 per month
  • Sales tax now reconciled to the GL before every filing
  • Owner draws set against a real owner equity number reviewed at month end

"The checklist is boring. The boring is exactly why it works. Nothing slips anymore."

Manhattan boutique agency

Books were technically current but useless for decisions

Before
  • Everything dumped into one income account and one expense account
  • No class or project tracking, so client profitability was a guess
  • Monthly reports went unread because they did not answer real questions
After 90 days on the checklist
  • Chart of accounts rebuilt around service lines during the monthly close
  • Project-level P&L showed two retainers were losing money on delivery time
  • Owner repriced two contracts and dropped one, adding roughly 14 points of net margin

"I finally have a P&L that tells me which clients to keep and which ones to let go."

Client names withheld for confidentiality. Outcomes reflect specific engagements and depend on transaction volume, file condition, and owner participation.

Common Questions

How often should a small business close its books?

Every month. Closing monthly keeps your tax filings clean, surfaces issues while you still remember the context, and gives you real numbers to make decisions on instead of guessing from memory.

How long does a monthly close take?

For a clean small business with under 200 transactions per month, a disciplined monthly close runs 2 to 4 hours. Messy books, multiple entities, or payroll complications push that higher. The checklist exists so nothing gets skipped.

Do I need this if I use QuickBooks Online?

Yes. QuickBooks records transactions but it does not reconcile your accounts, categorize correctly on its own, or close the month. The checklist is the human process that turns QuickBooks data into closed, usable books.

What if I am behind by several months?

Run a cleanup first, then start the monthly checklist going forward. Trying to do current-month work on top of unreconciled prior months creates more errors. Cleanup is its own project.

Can Pinstripe run this checklist for my business?

Yes. Our bookkeeping service runs this exact close every month inside your QuickBooks Online. You keep ownership of your data and software. Visit our bookkeeping services page or contact us to talk.

Want us to run this every month?

Pinstripe runs the full monthly close inside your QuickBooks Online. You keep your data, your software, and your time back.

Schedule a Bookkeeping ConsultationSee Bookkeeping Services

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