A year-end close is the routine that turns twelve months of transactions into a finished, locked set of books your accountant can file from. Think of it as the monthly close one size larger, with a few year-only extras and a final lock. Here is the checklist, step by step, and how an AI assistant runs most of it for you.
Why the year-end close is worth doing carefully
Everything downstream depends on it. Your tax return copies from these numbers, so an error here is an error you file. Locked books also settle history: the year your CPA reviews in March is the same year that exists in your books the following September, because nothing can quietly drift after the lock. If you’ve been closing each month, this is a light review. If you haven’t, it’s where you get current before it matters.
The checklist
1. Reconcile every account through December 31
Tie each bank, credit card, and loan account to its year-end statement balance, to the cent. This is the safety net that catches everything the other steps missed, so reconcile every account with a balance, not just checking. If a balance ties, that account’s year is proven; if it doesn’t, the difference points straight at what’s missing. More on the mechanics in the monthly close checklist.
2. Categorize and clear the review queue
Categorize every remaining transaction and leave nothing sitting uncategorized. An expense stranded in a review queue is a deduction you won’t claim and a report line that’s wrong. Clear the queue to zero.
3. Chase and attach any missing receipts
Track down documentation for the large or unusual charges, the equipment purchase, the big vendor payment, and attach the receipt to the transaction. Year end is your last easy chance to find a receipt while you still remember what it was.
4. Review the profit and loss and balance sheet for anomalies
Read both statements like an owner. On the profit and loss, does revenue look right and did any expense line jump in a way you can’t explain? On the balance sheet, is any account negative that shouldn’t be? You’re not auditing, you’re noticing, and a two-minute skim catches the miscoded entry that skews the whole year.
5. Book depreciation and run the 1099 and Schedule C reports
Post the year’s straight-line depreciation on your fixed assets so the balance sheet is right, then run your tax reports while the books are still open. The 1099 report shows which contractors crossed the reporting threshold, and the Schedule C report lays out your income and deductions on the lines the form uses. Running them now, before the lock, is how you catch a miscategorized contractor or a missing deduction while you can still fix it.
6. Lock the period
Close means closed. Lock the books through December 31 so nothing, human or AI, can post into the year. Any correction after that happens in the current period, visibly, which is exactly what keeps your locked year matching what your CPA files.
How an AI agent runs most of this
Because LedgerMCP ships an MCP server, you can hand the mechanical parts to an assistant like Claude or ChatGPT and keep the judgment for yourself. It can reconcile each account against the year-end statements, clear the categorization backlog in a batch and flag what it’s unsure about, and run the financial reports for your review. You read the flags, confirm the anomalies are explained, and give the word to lock. Every action the agent takes is audit-logged and reversible, and the ledger itself enforces that entries balance and locked periods stay locked, so delegating the work never means loosening the controls.
If you’re behind, this is also your catch-up
Staring at months of backlog? Work the pile oldest-first, closing and locking each month as you go, and this same checklist gets you current. Then next year’s close is a review instead of a rescue, and January’s 1099s become a report you print rather than a project you dread.
Quick answers
How is the year-end close different from a monthly close?
It’s the same work, done once for the whole year with a few extras. You reconcile every account through December 31, book annual adjustments like depreciation, run your tax reports, and lock the year. If you closed each month, year-end is mostly a review and a lock.
What does locking the period actually do?
It freezes the year so nothing, human or AI, can post into it. Any later correction happens in the current period, out in the open. That’s what keeps the year your CPA files matching the year that exists in your books six months later.
Do I need to reconcile every account, or just checking?
Every account with a balance: checking, savings, and each credit card and loan. Reconciliation is the safety net that proves your books match reality. One unreconciled card is where a whole year’s error can hide.
When should I run the 1099 and Schedule C reports?
After everything is categorized and reconciled, so the numbers are final. Run them before you lock so you can catch a miscategorized contractor payment or a missing deduction while the books are still open.