A month-end close is the routine that turns a pile of recorded transactions into books you can trust: everything categorized, the bank balance tied out, the period locked, and a P&L you'd show your accountant. Here is the 9-step checklist we recommend for small businesses, with what each step actually catches, and the prompt that hands it to an AI agent instead.
Why bother closing monthly?
Because errors compound. A duplicate in March that nobody catches until tax season is buried under nine more months of transactions; the same duplicate caught at March's close takes one click to reverse. A monthly close also makes your numbers current: you run the business on this month's margin, not on a guess. And once a month is closed and locked, it stays closed: the January your CPA saw is the January that exists in July.
The checklist
1. Get every transaction in
Bank feeds pull automatically; otherwise import the month's statements. Catches: the missing week that makes reconciliation impossible later.
Agent prompt: “Import June's statements for checking and the card.”
2. Clear the review queue
Categorize everything; leave nothing uncategorized “for later,” because later is April 14th. Catches: the slow drift into a giant Miscellaneous bucket.
Agent prompt: “Categorize everything new; flag what you're unsure about instead of guessing.”
3. Match transfers
Money moved between your own accounts must post once as a transfer, never as income in one place and expense in another. Catches: the classic inflated-revenue error.
Agent prompt: “Find and confirm any transfers between my accounts this month.”
4. Resolve duplicate flags
Same amount, same date, different source? Decide: real double purchase or duplicate import. Never auto-merge. Catches: double-posted rows before they poison the tie-out.
5. Split what needs splitting
The Costco run that was half supplies, half personal; the loan payment that's part principal, part interest. Catches: categories that are technically wrong all year.
Agent prompt: “Split that $275 Costco charge: $180 supplies, $95 owner's draw.”
6. Reconcile each bank account
The heart of the close: ledger balance vs. statement ending balance, to the cent. If it ties, your books describe reality. If not, the difference points at exactly what's missing. Catches: everything the earlier steps missed. This is the safety net.
Agent prompt: “Reconcile checking against the June statement, ending balance $12,410.22.”
7. Book the boring adjustments
Depreciation on equipment, owner draws/contributions taken during the month. On a good setup this is one standing instruction; depreciation in particular can post itself with an idempotent monthly entry.
8. Skim the reports like an owner
Two minutes on the P&L: does revenue look right? Any expense line jump 3x? Margin drifting? You're not auditing, you're noticing. (What the reports mean comes straight from double-entry mechanics, worth 10 minutes once.)
Agent prompt: “Run June's P&L and tell me what changed vs May and why.”
9. Lock the period
Close means closed: lock the book through month-end so nothing, human or AI, can post into it. Any later correction happens in the current period, visibly. Catches: the silent history drift that makes accountants distrust small-business books.
Agent prompt: “Lock the books through June 30.”
How long this takes
| Setup | Typical monthly close |
|---|---|
| By hand in a spreadsheet | 3–6 hours (and step 6 usually skipped) |
| Traditional software, you clicking | 1–3 hours |
| AI agent + your review | 10–20 minutes, mostly reading flags |
The agent version isn't a different close. It's the same nine steps, executed by the assistant and verified by the ledger. On LedgerMCP the whole sequence is one conversation, every action lands in an audit log, and the database makes the dangerous mistakes impossible (how, exactly).
If you're behind, close backwards first
The checklist assumes you're current. If you're staring at months of backlog, run the catch-up workflow first. It's this same close applied month-by-month through the pile, oldest first, locking as you go. Then this checklist keeps you never-behind again, and January's 1099s become a report you print instead of a project you dread.