October is closer than it feels. Once the fourth quarter starts, the calendar fills up fast — holiday demand, year-end payroll, vendor renewals, and then tax season lands right on top of it. Businesses that spend a few hours cleaning up their books in September walk into January with a clear picture and a short to-do list. Businesses that don't spend most of the winter reconstructing a year of transactions from memory and bank statements.
This is a practical checklist for what to tidy up now, while there is still a quarter left to fix anything you find.
1. Catch the books up through August
Everything else on this list depends on having books that are actually current. Before you analyze anything, make sure the fundamentals are done through the end of last month:
- Every bank, credit card, and loan account reconciled to the statement — not just "matched" in the software.
- Uncategorized and "Ask My Accountant" transactions cleared out.
- Outstanding checks and deposits in transit reviewed for anything stale.
- Owner contributions and draws recorded as equity, not as income or expense.
If you are more than a month behind, start here and stop reading the rest of the list until it's done. A backlog compounds: see how falling behind on bookkeeping becomes an expensive backlog.
2. Clean up the balance sheet, not just the P&L
Most owners glance at the profit and loss statement and stop there. The balance sheet is where year-end problems hide. Look for:
- Accounts receivable that will never be collected. Invoices sitting unpaid for 120+ days need a collection push now or a write-off decision before year-end.
- Accounts payable that were already paid. Duplicate bills inflate liabilities and distort cash planning.
- Negative balances in asset or liability accounts, which almost always signal a miscoding.
- An undeposited-funds account that keeps growing — usually payments recorded twice.
- Loan balances that don't match the lender's payoff statement, which means principal and interest are being split incorrectly.
3. Chase vendor W-9s before December
Every contractor and service vendor you paid this year may need a 1099 in January. Collecting a W-9 in September takes one email. Collecting it in late January, from a contractor who has moved on, takes five. Pull a vendor list for the year, flag anyone unincorporated you paid meaningful amounts to, and request the missing forms now. Our post on starting 1099 prep early covers the full process.
4. Review payroll and owner compensation
Payroll corrections are much cheaper before the final quarter closes than after W-2s are issued. Confirm that employee and contractor classifications still reflect how people actually work, that bonuses planned for December are budgeted, and that benefits or reimbursements are being recorded in the right accounts. If you run an S corporation, this is the quarter to confirm your salary versus distribution split is defensible — a conversation for your CPA, not a spreadsheet guess.
Not sure what your balance sheet is hiding?
Shieldbearer Ledger Co. reconciles and reviews your accounts monthly, so year-end is a report you read, not a project you dread.
5. Look at the numbers that will drive next year
Clean books are worth little if nobody reads them. With three quarters of real data in hand, pull:
- Revenue by month, to see the real shape of your busy and slow seasons.
- Gross margin by service or product line, to find work that keeps you busy without paying.
- Fixed overhead per month, so you know your true break-even before you set next year's targets.
- A simple cash forecast through March, when receipts are usually slow and tax payments are not.
A real-world example
A regional landscaping company came to us in mid-September with books that were "basically fine." The P&L looked healthy. The balance sheet told a different story: $28,000 of receivables more than 120 days old, an undeposited-funds account holding $9,400 of double-recorded customer payments, and eleven subcontractors with no W-9 on file.
Fixing it in September meant the owner had three months to collect on the old invoices — he recovered about $19,000 — and the duplicate payments came out of the books before they inflated his reported income. The W-9 requests went out with September invoices and all eleven came back by Halloween. In January, 1099 filing took one afternoon instead of two frantic weeks. Had all of that surfaced in February, the collections window would have closed and the cleanup would have happened under deadline pressure, at a higher cost.
Confirm the specifics with your CPA
The items above are stable, general practices, not tax advice. Filing thresholds, deduction rules, entity-level elections, and deadlines change and depend on your state, entity type, and situation. Use this checklist to get your records clean and complete — then let your CPA make the tax calls with accurate numbers in front of them.
How Shieldbearer Ledger Co. helps
We run this cleanup for our clients as part of normal monthly work, so year-end isn't an event. That means reconciled accounts every month, a balance sheet review that catches stale receivables and duplicate payables early, vendor W-9s collected as vendors are onboarded rather than chased in January, and reports your CPA can use without rebuilding them.
If your books are behind or you're not sure what the balance sheet is telling you, September is the best month of the year to fix it. There is still time to act on what you find.
See our service tiers at shieldbearerledger.com/services or reach out at shieldbearerledger.com/contact.