January Year-End Checklist:
Close the Books Right
January is the most important financial month of the year for small business owners. What you do in the first 30 days determines how clean your tax return is, how accurate your year-end financials are, and how prepared you are for the year ahead.
Most business owners treat January as a fresh start — but it's actually the month where last year's financial decisions get finalized. Reconcile your books, gather your documents, and set your systems up correctly now, and the rest of the year runs smoother.
Reconcile and Close the Books
Before anything else, your books for the prior year need to be fully reconciled. This means every bank account, credit card, and loan balance matches your accounting software — to the penny. If your books aren't reconciled, everything downstream (tax return, financial statements, loan applications) is unreliable.
Gather Tax Documents
Tax documents arrive throughout January and early February. Getting organized early means you can file early — or at least give your accountant everything they need without a scramble in March.
| Document | Due Date | Who Sends It |
|---|---|---|
| W-2 (if you're an S-Corp owner-employee) | January 31 | Your payroll provider |
| 1099-NEC (if you paid contractors $2,000+ in 2026; was $600 pre-OBBBA) | January 31 | You must send these |
| 1099-K (payment processors) | January 31 | Stripe, PayPal, Square, etc. |
| 1098 (mortgage interest) | January 31 | Your lender |
| 1099-INT (bank interest) | January 31 | Your bank |
| K-1 (if you're a partner or S-Corp shareholder) | March 15 | The entity |
| Schedule K-1 from investments | Varies | Brokerage or fund |
1099-NEC deadline: If you paid any contractor, freelancer, or service provider $2,000 or more in 2026 (raised from $600 under OBBBA — verify current threshold at IRS.gov for prior years), you must send them a 1099-NEC by January 31. Failure to file carries penalties of $60–$330 per form. Collect W-9s from contractors before year-end to avoid this scramble.
Review Last Year, Plan This Year
Once the books are closed, run your year-end financial statements and actually read them. Most business owners file their tax return without ever reviewing their P&L or balance sheet. That's a missed opportunity.
Set Up for a Clean New Year
January is the best time to fix systems problems — before another year of bad data accumulates. If your books were messy last year, this is the moment to change that.
January Tax Deadlines
Q4 estimated tax payment due (individuals)
Can skip if you'll file and pay by Feb 1
W-2s must be sent to employees
Penalty: $60–$330 per form
1099-NECs must be sent to contractors
Penalty: $60–$330 per form
1099-NECs filed with IRS
Same deadline as recipient copies
Other 1099 forms filed with IRS (paper)
March 31 for electronic filing
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