Year-End Bookkeeping Checklist for Small Business (Tax Year 2026)

Every January, a lot of owners spend their evenings digging through bank statements, hunting for receipts, and texting contractors for their tax info. Then the accountant asks for "a few more things," and the stress starts again.

Most of that can be done before the year ends. October, November, and December are the best time to clean up your books, while the receipts are still easy to find and people still answer their phones.

This checklist walks you through closing out tax year 2026 in plain English. It includes the key dates for early 2027 and one big change this year for contractor forms. You'll also see where AI can do the slow parts.

This is general information, not tax advice. Rules depend on your business type and state. Your accountant or tax preparer should have the final word.

The plain answer: the year-end checklist

Work through this in small pieces. An hour a week from now to December is plenty for most small businesses.

October: clean up the year so far

1. Reconcile every account through September. Reconciling means checking that your books match your bank and card statements. Fix any gaps now.
2. Find missing receipts. Look for big purchases with no receipt. Most stores and online sellers can reprint one.
3. Split out personal spending. If any personal charges hit the business account (or the other way around), mark them now.
4. Collect Form W-9 from every contractor. A W-9 gives you their legal name, address, and taxpayer ID. Ask for it now, not in January.

November: check the big items

1. Check your contractor totals against the new threshold. For payments made after December 31, 2025, the IRS reporting threshold for Form 1099-NEC went up from $600 to $2,000 for the year, per the IRS instructions for Forms 1099-MISC and 1099-NEC. So for tax year 2026, you generally file a 1099-NEC for a non-employee you paid $2,000 or more for services. Ask your accountant about any special cases, like attorneys.
2. Add up business miles. The IRS standard mileage rate for 2026 changed mid-year: 72.5 cents a mile from January 1 to June 30, and 76 cents a mile from July 1 to December 31. See the IRS standard mileage rates page. Keep your log split by those two periods so your accountant can use the right rate.
3. List equipment you bought. Tools, computers, vehicles, and machines are often handled differently from supplies. Give your accountant the date, cost, and a receipt for each.
4. Look at your profit so far. A simple profit and loss report (money in minus money out) tells you if you're on track. Bring it to your accountant before year-end. There may be smart moves you can only make before December 31.

December: close it out

1. Count your inventory on or near December 31 if you sell products. Write down what you have and what it cost.
2. Chase unpaid invoices. Send reminders now. Our guide on getting customers to pay invoices faster has templates.
3. Reconcile October through December once the last statements arrive.
4. Back up your books and receipts. Save a copy of everything in a second place.

Key dates in early 2027

• January 15, 2027: the fourth estimated tax payment for 2026 is due, per the IRS estimated tax page.
• February 1, 2027: Forms W-2 are due to employees and to the Social Security Administration, per the IRS W-2 instructions.
• Form 1099-NEC: due to the IRS and to the contractor by January 31. In 2027 that date is a Sunday, so it moves to the next business day, Monday, February 1, 2027.

A before/after example

Here's a typical case. It's not a real client.

Before: A painting contractor with two employees and a few subcontractors waits until January. He finds out one sub never sent a W-9 and has stopped answering texts. His mileage is scattered across a calendar app and some gas receipts. He can't tell if the new truck he bought in August had a receipt saved. His accountant files an extension, and he pays more in fees for the cleanup.

After: He starts in mid-October. He emails every sub for a W-9 and has them all by November. He reconciles one month each Friday afternoon. In November he checks which subs passed $2,000, adds up miles in two groups (before and after July 1), and sends his accountant a list of equipment with receipts. In December he chases two unpaid invoices and gets both paid before New Year's. In January he sends one tidy folder to his accountant.

Same business. The work just happened earlier, in small pieces.

Where AI helps

An AI tool like ChatGPT, Claude, or Gemini is a chat assistant that writes and explains in plain English. At year-end it can:

• Turn this checklist into a calendar with dates for your business.
• Write a polite email asking contractors for their W-9.
• Explain a confusing report, like a profit and loss statement, in simple words. (Share totals, never account numbers.)

An AI agent is a tool that takes steps on its own, following rules you set. For year-end, an agent can:

• Read receipt photos, sort them into categories, and match them to bank transactions.
• Flag charges with no receipt or no category, so you only look at the problems.
• Track contractor totals and warn you when one passes $2,000.
• Send W-9 requests and payment reminders on a schedule.
• Remind you of each deadline above, a week ahead.

You can see options like these in our automation catalog. If you don't have a weekly routine yet, start with our 30-minute weekly bookkeeping routine. It makes year-end much lighter.

If paper receipts are your problem, a small desktop receipt scanner can help a lot. Check our own store, Sun Valley Sales, first. We're a small family business in Mesa, Arizona.

Try this today

This takes about 20 minutes.

1. Make a list of every contractor you paid this year and roughly how much.
2. Open a free AI chat tool.
3. Paste the prompt below and fill in the brackets.
4. Put the dates it gives you on your calendar.
5. Send the W-9 request email to anyone you don't have a form from.

I run a small [type of business] with [number] employees and about [number] contractors. I want to close out tax year 2026 without a January scramble.

Please:
1. Turn this into a week-by-week plan from mid-October to December 31: reconcile accounts, find missing receipts, collect W-9s, add up mileage (split Jan-Jun and Jul-Dec), list equipment purchases, count inventory, chase unpaid invoices.
2. Write a short, polite email asking a contractor for a completed Form W-9.
3. List the questions I should ask my accountant before December 31.

Do not give tax advice or tell me what I can deduct. Tell me to ask my accountant for that.

The honest limits

• AI is not a tax expert. It can mix up years, thresholds, and rules. Always check dates and numbers against IRS.gov or your accountant.
• It can miscategorize. A charge at a hardware store could be supplies, a tool, or personal. Look over what it sorts.
• Keep sensitive data out of free tools. Don't paste Social Security numbers, tax IDs, or account numbers into a chat assistant. Our checklist on AI and customer data explains why.
• The decisions are yours. What to buy before year-end, how to treat equipment, and how much tax to set aside are questions for your accountant.

Frequently asked questions

What is the 1099-NEC threshold for 2026?

For payments made after December 31, 2025, the reporting threshold went up from $600 to $2,000 per recipient for the year, according to the IRS instructions. Ask your accountant about exceptions.

When are 1099-NEC and W-2 forms due in 2027?

Both are due by January 31, which falls on a Sunday in 2027, so the deadline moves to Monday, February 1, 2027. The IRS W-2 instructions list February 1, 2027 directly.

What is the 2026 mileage rate?

72.5 cents per business mile from January 1 to June 30, 2026, and 76 cents per mile from July 1 to December 31, 2026, according to the IRS.

When should I start year-end bookkeeping?

October is ideal. You have time to fix problems, collect forms, and talk to your accountant before December 31.

Can AI do my year-end books?

AI can do much of the sorting, matching, and reminding. A person should still review it, and your accountant should handle the tax return and advice.

Close the year calm

Pick one item from the October list and do it this week. Small steps now mean a quiet January.

If you'd like receipts, reminders, and contractor tracking to run on their own, try our business simulator, get a free website review, or compare our plans. Questions? A real person answers: our owner, Johnathon Lawson, at [email protected].