Month-End Close Checklist: The Client Documents Bookkeepers Need Every Month

For most bookkeeping and Client Accounting Services (CAS) teams, the month-end close doesn't wait on the accounting work. It waits on the client. A statement is missing, a payout report never arrived, or a dozen transactions can't be categorized without an answer from the owner.

A consistent, client-specific checklist is the simplest fix. Here's what to include, and how to collect it reliably.

The core monthly checklist

• Bank statements for every operating, savings, and payroll account, even when a bank feed is connected. Statements confirm balances for reconciliation.
• Credit card statements, including any personal cards the owner uses for business expenses.
• Payroll reports from the payroll provider: the payroll register and tax liability reports for each pay period.
• Sales and payout reports from POS, e-commerce, and payment platforms (for example, Stripe, Square, or Shopify), so gross sales, fees, and refunds can be separated from net deposits.
• Receipts and invoices for transactions above your documentation threshold, or any that need a business purpose.
• Loan and line-of-credit statements, to split payments into principal and interest.
• Bills and customer invoices that aren't already in the accounting system.
• Answers to your list of uncategorized or unclear transactions.

Quarter-end and year-end additions

Some items only come up a few times a year. Add them to the month that needs them so they don't become a surprise:

• Quarterly payroll tax filings and state unemployment reports.
• Sales tax returns and supporting reports, where the client files them.
• Details of new fixed asset purchases: invoices, in-service dates, and financing.
• Inventory counts, where inventory is significant.
• At year-end: W-9s for contractors who will need a 1099, owner contributions and distributions, and year-end loan statements.

Uncategorized transactions are the real bottleneck

Statements are usually easy to get. The harder part is the list of transactions only the client can explain. A few habits make those questions much faster to answer:

• Ask in one batch per month, not one email per transaction.
• Give context with every question: date, amount, payee, and your best guess at the category.
• Offer multiple-choice answers where you can, such as “Meals with clients / Personal / Other”.
• Remember recurring answers so the same vendor isn't questioned every month.

Build a repeatable monthly request

1. Send the request on the same day each month, ideally the first business day.
2. Make the list client-specific, based on the accounts and platforms that client actually uses.
3. Set a due date a few business days into the month, early enough to leave time for review.
4. Send one reminder that lists only what's still missing.
5. Record items that don't apply (an account with no activity, say) so they aren't requested again.

Stop the close from stalling

Separate client-dependent tasks from internal ones. Reconcile the accounts you have documents for, post recurring entries, and review what you can, while the client items are outstanding. Then the close finishes as soon as the last item arrives, instead of starting then.

Across many clients, the most useful view is a simple one: which engagements can be closed now, and which are waiting on the client. Without it, managers spend their time asking staff for status.

Running tax engagements as well? Read how to chase clients for tax documents for a follow-up cadence that works across the season.