Year-End Bookkeeping Checklist for Small Businesses

TL;DR

Start now, not on December 31. Reconciling accounts and fixing miscoded transactions takes the longest, and tax-saving decisions need to happen before the year ends.
Reconcile every bank, credit card, loan and payment-processor account through the last day of the year, then review the profit and loss statement and balance sheet for anything that looks off.
Collect W-9s, confirm which contractors will need a 1099-NEC, and confirm payroll totals match your records before January filing deadlines.
Talk to your CPA before December 31. Equipment purchases, income timing and entity fees can only be planned while the year is still open.
Keep your records organized by year. Employment tax records need to be kept for at least four years.

Why year-end is easier when the months were clean
The year-end bookkeeping checklist
Deadlines to put on your calendar
Use the last weeks of the year for tax planning
Industry notes: pet businesses and laundromats
A realistic timeline from now to January
Where we can help
Our perspective: close the year in October, not January
FAQ
Sources

Why year-end is easier when the months were clean

The biggest factor in how painful year-end feels is what happened in the other eleven months. Accounting professionals consistently point out that a disciplined month-end process turns the year-end into a final review rather than a high-pressure audit of twelve months of data. If you have been reconciling monthly, most of this checklist will take you an afternoon. If you haven’t, the same checklist still works, but you will be doing the monthly work in a batch first.

If you are behind, don’t try to patch December alone. Go back to the first month that has an unreconciled account and work forward. Our guide to catch-up bookkeeping for Kern County businesses explains how far back you can reasonably go on your own and when it is cheaper to hand it off.

If you want the ongoing version of this process, our monthly close checklist for Xero users covers what to do in the first ten days of every month so year-end doesn’t pile up.

The year-end bookkeeping checklist

1. Reconcile every account through December 31

Reconciliation means matching what your books say to what the bank or card issuer says, line by line. Do it for:

Business checking and savings accounts
Business credit cards
Loans and lines of credit
Payment processors and merchant accounts (Square, Stripe, PayPal and similar)
Any account you use for cash deposits, such as coin and card revenue at a laundromat

The IRS says a sound recordkeeping system includes a business checkbook reconciled against bank statements. Order matters here. The statement for the last month of the year won’t arrive until early January, so plan a second pass then. Reconcile what you can in December, and finish the final month once statements post.

Watch for three common problems:

Duplicate imports. The same transaction pulled in from a bank feed and entered by hand.
Transfers booked as expenses. Moving money between your own accounts is not income or an expense.
Owner activity mixed in. Personal purchases on a business card and owner draws recorded as business costs.

2. Clear the uncategorized and suspense accounts

Open your chart of accounts and look for anything named “Uncategorized,” “Ask My Accountant,” “Suspense” or “Miscellaneous.” Every balance in those accounts is a question your tax preparer will have to answer, and it will cost you time or money. Assign each transaction to a real category, and attach a receipt or note where the purpose isn’t obvious.

This is where miscoded expenses hide. A truck payment booked as a plain expense, or a loan payment treated entirely as a cost, changes your taxable income. Principal on a loan is not deductible, while interest is. Fixing it now is much easier than amending a return later.

3. Review payroll and contractor records

Payroll is the part of the checklist with hard external deadlines. Check these items:

Payroll totals. Gross wages, withholdings and employer taxes in your books should match your payroll reports for the year.
Quarterly filings. Confirm that all quarterly payroll returns were filed and all deposits were made.
Employee records. Confirm names, addresses and Social Security numbers are correct before forms go out.
Contractor payments. Total what you paid each contractor for the year and confirm you have a W-9 on file for each.

Employers must submit Form W-2 to the Social Security Administration and furnish it to employees by January 31, moving to the next business day when that date falls on a weekend. Form 1099-NEC has the same deadline. In 2027 January 31 is a Sunday, so the due date for forms covering 2026 payments is Monday, February 1.

The reporting threshold for 1099-NEC is also changing. Our 1099-NEC rules guide explains the new $2,000 threshold and how to avoid penalties. Run the contractor report now, while there is still time to chase down a missing W-9.

If you changed payroll providers during the year, or left a PEO, check for duplicated or missed payroll tax deposits. This step-by-step PEO exit checklist shows where the overlap usually happens.

4. Review accounts receivable

Open the aged receivables report and sort by how late each invoice is. For each unpaid invoice, make one of three decisions:

Collect. Send a reminder before the holidays, when many customers are still paying out of this year’s budget.
Adjust. If there is a dispute or credit pending, record it properly so revenue isn’t overstated.
Write off. If an invoice is truly uncollectible, discuss the write-off with your tax preparer. How it is treated depends on whether your business reports income on a cash or accrual basis.

Also check for the reverse: deposits received for work you haven’t done yet. Under accrual accounting those are liabilities, not revenue.

5. Review accounts payable and accruals

List every bill you owe as of December 31, including ones that haven’t arrived. Match vendor statements to your records, find missing bills, and note due dates. If you keep books on an accrual basis, expenses belong in the year they were incurred, not the year you wrote the check. Typical items people forget:

Utility bills for December that arrive in January
Year-end bonuses and accrued vacation
Professional fees for work already performed
Sales tax collected but not yet remitted

California retailers and service businesses should also confirm sales tax collected matches what was reported on returns.

6. Take inventory and review fixed assets

If you carry inventory, count it as close to December 31 as you can and compare the count to your books. Differences are normal. Unexplained large ones are not. Retail, pet supply and product-based businesses should adjust for shrinkage, damaged goods and obsolete stock.

For equipment, update your fixed asset list. Add what you purchased this year with the date placed in service and the cost. Remove items you sold or scrapped. Your tax preparer uses this list for depreciation, and a wrong list means a wrong deduction.

7. Review the three core financial statements

Once the books are reconciled, run these reports and read them as if you were a lender:

Report	What to look for
Profit and loss	Categories that are far higher or lower than last year, negative expenses, revenue that doesn’t match deposits
Balance sheet	Negative cash or inventory, old receivables, unexplained loan balances, owner equity that doesn’t make sense
Cash flow	Whether profit turned into cash, and where the cash went

The SBA describes the balance sheet as a snapshot of financial health that lenders use to calculate your debt-to-asset ratio. If you plan to borrow in the coming year, a clean balance sheet matters beyond taxes. For owners with real estate, this explanation of how lenders calculate debt service coverage shows what they will want from your numbers.

Compare this year to last year line by line. The surprises you find are the entries to investigate.

8. Organize and store your records

The IRS says records should support each entry on your return and be kept by year and type of income or expense. For each year, that typically means:

Bank and credit card statements
Sales records, invoices and deposit slips
Receipts for expenses, with the business purpose where it isn’t obvious
Payroll reports and tax filings
Contracts, loan documents and lease agreements
Mileage logs and asset purchase documents

The same IRS page says employment tax records must be kept at least four years. For how long to keep everything else, see our guide on tax record retention. If you work with us, you upload documents through our Client Hub portal, so nothing depends on email attachments or a shoebox.

9. Close the books and lock the period

Once your tax preparer confirms there are no more adjustments, lock the books through December 31. In Xero, you can set a lock date so no one accidentally changes closed periods. Keep a backup of final reports as PDFs. A locked period means the numbers on your return will still match your books when you look back at them in two years.

Deadlines to put on your calendar

Here are the dates that matter most to Kern County owners. Check each against your own entity type.

When	What	Who it applies to
December 10, 2026	First installment of secured property taxes due without penalty	Owners of business real estate in Kern County
December 31, 2026	Last day for equipment purchases and income timing decisions for the year	All calendar-year businesses
January 31, 2027 (shifts to February 1)	W-2 and 1099-NEC deadlines	Employers and anyone who paid contractors
March 15, 2027	S corporation and partnership returns (confirm shifts if on a weekend)	Pass-through entities
April 15, 2027	The annual $800 tax for California LLCs, per the FTB’s due dates, applies to the 2027 tax year too	California LLCs

On partnerships, the FTB sets the return due on the 15th day of the third month after year end, with an automatic six-month extension. Dates shift when they land on weekends or holidays, so verify the exact day with the agency or your CPA.

California has a few entity-level wrinkles that catch owners out. We cover them in our guides to the California LLC tax, the LLC fee, the franchise tax and small business tax deadlines for Kern County.

Use the last weeks of the year for tax planning

Reconciled books are the starting point for tax planning, not the end. Industry guidance says the period before year end is the ideal window to talk with a CPA about strategies, such as timing equipment purchases or income recognition. After December 31, most of those options are gone.

Questions to bring to that conversation:

Is my profit higher or lower than expected, and does that change when I should buy equipment or pay bills?
Should I defer any December invoicing or accelerate expenses, given my accounting method?
Is my entity type still the right one for my income?
Do I need to adjust estimated tax payments or payroll withholding before the year closes?
Are retirement plan contributions worth setting up before the year ends?

The answers depend on your numbers, which is why the books need to be right first. Our Bakersfield tax planning with reconciled books guide shows how clean records change what is possible, and our business tax preparation checklist lists what your preparer will ask for once the year closes.

Industry notes: pet businesses and laundromats

A general checklist misses the quirks of specific industries. Two we see often:

Pet businesses. Grooming, boarding, daycare and retail all have different revenue patterns. Prepaid packages, tips, product inventory and vet or supplier refunds all need clean year-end treatment. Our Bark Ave service is built for these owners.
Laundromats. Utilities are a major cost, and cash and card revenue come from machines rather than invoices. Matching deposits to machine data at year-end catches missing income and utility errors. See our guide on laundromat bookkeeping.

A realistic timeline from now to January

If you want to finish without a rush, here’s a schedule that works for most owners.

Late October. Reconcile September and October. Clear uncategorized items. Run a contractor report and request missing W-9s.
November. Reconcile through November. Review the aged receivables and payables reports. Book a year-end planning meeting with your CPA.
Early to mid-December. Make the equipment, payroll and income-timing decisions that came out of that meeting. Pay property taxes if you own real estate.
Late December. Count inventory. Confirm payroll is final. Send final collection reminders.
Early January. Reconcile December once the statements arrive. Run financial statements. File W-2 and 1099-NEC forms by the deadline. Send your final package to your tax preparer.

Where we can help

We are a Bakersfield firm that has served Kern County small and mid-sized businesses for over twenty years. We keep bookkeeping and tax under one roof, so the person who reconciles your accounts is working with the team that prepares your return. That means fewer miscoded expenses and fewer surprises at filing time. We work exclusively in Xero and handle your migration at no cost.

If your year-end is already looking messy, our bookkeeping service can take it from here, and you can see what that involves on our small business bookkeeping checklist page. To plan ahead for the tax side, look at our tax planning and business tax preparation services, or contact us to set up a consultation.

Our perspective: close the year in October, not January

Most owners treat year-end as a January problem. By then the best options are gone, because tax decisions have to be made while the year is still open. We push clients to do the real work in the fall: get the books reconciled, find the gaps, and bring the numbers to a planning conversation while there is still time to act on them.

The other thing we see repeatedly is the cost of splitting bookkeeping and tax across different people. When the person coding expenses doesn’t talk to the person preparing the return, deductions get missed and errors get carried forward. That is why we keep both under one roof, and why we plan year-round instead of once the year has already ended.

A checklist helps, but the habit behind it matters more: a monthly close, clean categories, and a CPA who sees your numbers before December 31.

— Tolliver Team

FAQ

When should I start my year-end bookkeeping?

Start in October or November, not January. Reconciling accounts and fixing categories takes the longest, and tax planning decisions must be made before December 31. If you already close your books monthly, the final review may take only a few hours.

What documents does my accountant need at year-end?

Provide reconciled bank and credit card statements, profit and loss and balance sheet reports, payroll reports, contractor totals with W-9s, loan statements, and a list of equipment bought or sold. Our tax appointment checklist gives a fuller list for individuals and small businesses.

What is the difference between a year-end close and a month-end close?

A month-end close reconciles accounts and reviews numbers for one month. A year-end close does the same for the full year, and adds items such as inventory counts, fixed asset updates, accruals, 1099 and W-2 preparation, and final adjustments for your tax preparer. A consistent monthly close makes the yearly one much smaller.

Can I fix my books after December 31?

Yes, in most cases. You can reconcile and correct transactions dated in the prior year after the year ends, up until your return is filed. What you can’t do is change the actions you took during the year, such as buying equipment or paying bills. That is why planning has to come first.

What if I’m months behind on bookkeeping?

Work from the oldest unreconciled month forward instead of starting with December. If the backlog is large, getting help is usually faster and cheaper than learning as you go. Read our catch-up bookkeeping guide to decide which route fits.