Every January, small business owners hit the same wall. W-2s and 1099s are due, the accountant wants year-end reports, and the books are three months behind. So the first weeks of the new year turn into digging through bank statements, guessing at receipts, and chasing contractors for tax forms.
A year-end bookkeeping cleanup done in October or November fixes that. When your books are current before the holidays, January deadlines take hours instead of weeks, and your tax preparer gets numbers they can trust. Here's the checklist we use with small businesses in Oakbrook Terrace, Chicago, and the western suburbs.
Your year-end bookkeeping cleanup checklist
1. Reconcile every bank and credit card account
Start here, because everything else depends on it. Match each account in your books to its statement through September 30, then through October. Look for missing transactions, duplicates, and old uncleared checks. A deposit that never hit the bank or a payment recorded twice will throw off your income and your tax return.
2. Clear out uncategorized transactions
Most bookkeeping software has an "uncategorized" or "ask my accountant" bucket. By fall, it's often holding hundreds of transactions. Go through them now while you still remember what they were. Every dollar left uncategorized is either a deduction you might miss or income you might misreport.
3. Separate business and personal spending
If personal purchases went through the business account, or business expenses went on a personal card, record them correctly. Personal expenses paid by the business should be recorded as owner draws or distributions, not business expenses. Business costs paid personally should be added to the books so you get the deduction.
4. Review your accounts receivable
Run an aging report and look at every invoice more than 90 days old. Follow up on the ones you can still collect. If you keep your books on the accrual method and an invoice truly won't be paid, talk with your bookkeeper about writing it off before year-end.
5. Review your accounts payable
Make sure every bill you owe is entered and every bill you've paid is marked paid. Unrecorded bills understate your expenses, and old "open" bills that were actually paid make your balance sheet wrong.
6. Collect W-9s from every contractor
You need a Form W-9 on file for each contractor you pay. For payments made in 2026, you file a Form 1099-NEC for any contractor you paid $2,000 or more during the year, up from $600 in past years. Get missing W-9s now, while contractors are still answering your calls. In January, they're busy with everyone else's forms.
7. Check your payroll records
Compare your year-to-date payroll reports to your books. Confirm employee names, addresses, and Social Security numbers are correct so W-2s go out right the first time. If you plan to pay year-end bonuses, decide now so they run through payroll before December 31.
8. Look at your balance sheet, not just your profit and loss
Loan balances should match your lender's statements. Fixed assets you bought this year should be recorded as assets, not buried in expenses. If you collect sales tax, the sales tax payable account should match what you owe the Illinois Department of Revenue. A balance sheet that doesn't make sense usually points to a bigger error somewhere else.
9. Gather receipts and records for big purchases
For equipment, vehicles, and large expenses, keep the invoice and proof of payment in one place. Your tax preparer will ask for them, and the IRS can too.
The January deadlines clean books make easy
Here's what's due in early 2027 for the 2026 tax year. Every one of these depends on books that are already reconciled.
| Deadline | What’s due |
|---|---|
| January 15, 2027 | Fourth-quarter 2026 estimated tax payment |
| February 1, 2027 | Forms W-2 to employees and the Social Security Administration |
| February 1, 2027 | Forms 1099-NEC to contractors and the IRS |
| February 1, 2027 | Forms 1099-MISC to recipients |
| February 1, 2027 | Illinois W-2s filed electronically with the Illinois Department of Revenue, and the fourth-quarter Form IL-941 |
The usual January 31 deadlines move to February 1 in 2027 because January 31 falls on a Sunday. Your fourth-quarter federal payroll return (Form 941) and annual unemployment return (Form 940) are also due in early February. If you file 10 or more information returns in total, including W-2s and 1099s, the IRS requires you to file them electronically.
If your books are current by Thanksgiving, December is for planning, not catching up. You can see your profit for the year, talk with your tax preparer about moves that lower your tax bill, and walk into January with your forms almost done.
Signs you need a professional bookkeeping cleanup
Some books can be fixed in an afternoon. Others need a bookkeeping cleanup from someone who does it every day. It's time to call in help if:
- Your accounts haven't been reconciled in three months or more
- You have hundreds of uncategorized transactions
- Your bank balance and your books don't match, and you can't tell why
- You're not sure which contractors need a 1099
- Your tax preparer had to fix your books last year before filing
- You're behind on sales tax or payroll filings
Catch-up bookkeeping costs less in October than in March. In the fall, there's time to fix things properly. In tax season, everyone is rushing, including your accountant.
Frequently asked questions
What is a year-end bookkeeping cleanup?
It's a review of your books before the year closes. You reconcile every account, categorize every transaction, fix errors, and confirm your payroll and contractor records so your year-end reports and tax forms are accurate.
How long does a bookkeeping cleanup take?
It depends on how far behind the books are. A few months of missed reconciliations can take days. A full year of missing records can take several weeks, which is why starting in the fall matters.
When are W-2s and 1099s due for 2026?
Forms W-2 and 1099-NEC are due February 1, 2027, because January 31, 2027 falls on a Sunday.
Do I need to send a 1099 to every contractor?
For payments made in 2026, you file a Form 1099-NEC for contractors you paid $2,000 or more during the year. Payments to most corporations don't need one. Keep a W-9 on file for every contractor either way.
Can I do my own year-end bookkeeping cleanup?
If you're only a month or two behind and your accounts are simple, yes. If you're months behind, have payroll, or collect sales tax, a professional cleanup usually saves time and catches errors you'd miss.
Get your books ready before January with Farris Fair
Farris Fair Bookkeeping & Tax is led by a Certified Public Bookkeeper and IRS Enrolled Agent serving Oakbrook Terrace, Chicago, and the western suburbs. We handle bookkeeping cleanup, monthly bookkeeping, payroll and sales tax, and tax preparation, so your books and your return come from the same team. Book a free consultation and we'll tell you how far behind your books are and what it will take to get them current before January.
This article reflects federal and Illinois rules as of October 2026. Deadlines and thresholds can change, so confirm with your tax professional.
Sources
- IRS: General instructions for Forms W-2 and W-3 (2026)
- Illinois Department of Revenue: Filing and storage requirements for employers and payers
- Illinois Department of Revenue: Form IL-941 instructions
- NATP: Form 1099 changes under the new $2,000 threshold
- Dupple: When are 1099s due in 2027?