Year-end accounting close: a dated timeline for tax year 2026

Work backward from the 2027 filing dates

Set the filing dates first, then build the schedule backward. For tax year 2026, Form 1099-NEC goes to the IRS by January 31, 2027, which is a Sunday, so the weekend rule moves that due date to February 1. Form W-2 copies go to employees and the Social Security Administration by February 1, 2027. The fourth-quarter Form 941 is normally due January 31, 2027, which is a Sunday, so the due date moves to February 1, 2027.

Form 1120-S for a calendar-year S corporation is due March 15, 2027, a Monday. Form 7004 gives an automatic six-month extension for these returns, and most returns can be extended electronically. Treat the extension as a fallback, not the plan.

Mid-November to December: scope, lists and cutoff

Confirm scope in writing. Year-end 1099s, payroll year-end, the inventory count and the tax package are often billed outside the monthly fee, and the gap usually shows up in January. Put each add-on in the engagement letter with its price.

Send one request for the vendor list, the W-9s and the new-contractor list. Use wording like this: “Please upload the 2026 vendor report from your accounting software, showing the total paid to each vendor. Do not type any tax ID number into a message or a form field.” Clients paste Social Security numbers and EINs into email when the request does not say not to.

Write the cutoff rule for checks written in the last days of the year into the close memo. That rule decides whether a payment lands in the 2026 1099 total or the 2027 total.

Reconcile every bank and card account

Tie each book balance to the statement ending balance, and list every deposit in transit and outstanding check by number and amount. A zero difference with no open-item list is not a reconciliation a reviewer can sign.

Decision rule: if a reconciling item is more than 30 days old, ask the client in writing what it is. If the client cannot say, post it to a suspense account with a dated note and an owner. Never post it to income or expense just to make the balance agree.

Failure mode: a reconciliation finished through November but never reviewed, so December opens on an unreconciled balance. Reconcile back to the last signed-off month, and show any opening difference on the close memo.

Accruals, prepaids and the fixed-asset election

Run an unrecorded-liabilities search before you close. Pull the January 2027 disbursements and look for bills for 2026 services. Accrue each one in 2026 with the invoice number, and reverse it at the start of 2027 so the January payment is not counted twice.

Every purchase needs a capitalization decision. Under the de minimis safe harbor, a business without an applicable financial statement may deduct amounts up to $2,500 per invoice or item. With an applicable financial statement the limit is $5,000 per invoice or item. The election is a statement attached to the timely filed original return, including extensions, so mark it on the asset schedule before the return is prepared.

Build the 1099 list from the vendor report

Start from the vendor report, not the bank feed. The IRS instructions say that for tax years beginning after 2025 the minimum threshold for reporting certain payments increased to $2,000. Payments made in 2025 stay on the earlier, lower threshold, so do not carry a 2025 rule into this list. Attorney payments have their own line: Box 10 of Form 1099-MISC covers gross proceeds of $600 or more paid to an attorney.

Decision rule: if a vendor has no TIN, file with what you have, log the request and the reply, and flag the vendor for backup withholding. The rule requires the payer to withhold at a flat 24% rate when the payee does not give a taxpayer identification number in the required manner. Flag the next payment before it goes out.

A vendor paid only by card or payment app usually stays off the list, because the payment company reports it. A vendor paid partly by card and partly by check belongs on the list for the check amount only.

Filing dates for 2026 forms: Form 1099-NEC is due to the IRS January 31, 2027, which moves to February 1. Recipient statements for Form 1099-NEC are also due January 31, 2027, which moves to February 1, 2027 under the weekend rule. Form 1099-MISC is due February 28 on paper and March 31 electronically, and February 28, 2027 is a Sunday, so the paper date moves to the next business day.

Tie payroll to Form 941 before the W-2s

Tie the payroll register to the four quarterly Form 941 returns first. Wages and withholding on each Form 941 should agree to the payroll journal for that quarter. A quarter that does not tie matters more than a 1099 that is off by one vendor.

Then tie the year's W-2 totals. Box 1 of Form W-2 leaves out pre-tax 401(k) deferrals, which are included in Form 941 wages, so add those back before you compare. If a difference remains, check for a bonus paid outside the regular cycle, a cash payment, or a second payroll account.

Finish the tie-out before the fourth-quarter return is filed. A change to Q4 wages after filing means an amended return.

Lock the period and write the close memo

Lock the period only after the bank and card reconciliations, the payroll tie-out, the 1099 vendor list and the adjusting-entry log agree. Set the closing date in the accounting software, and record who set it, when, and which reviewer signed off.

Decision rule: after the lock, a change that moves an amount across the year-end line needs a reopen, a senior reviewer's written sign-off, and an entry in the close memo with the amount and the reason. Repeated reopens usually mean the tie-out was not finished.

The close memo should cover the check cutoff rule, open items with owners, accruals, fixed-asset elections, backup withholding flags, the 1099 total and the Form 941 to W-2 tie-out.

Keep the workpapers with the return. The IRS says to keep records for 3 years if none of the longer situations applies. It says 6 years if you did not report income you should have reported and that income is more than 25% of the gross income shown on your return. Employment tax records stay at least 4 years after the tax is due or paid, whichever is later.

Requests that stall the close, and the fix for each

Four requests hold up most closes in practice: vendor W-9s, card and loan statements for the last weeks of the year, owner draw detail, and the year-end inventory count, which needs its count date and value at cost. Ask for each one by name.

For W-9s, pull the log from each vendor's first payment. For any vendor paid in 2026 with no form on file, send one request: “We still need a signed W-9 from your business before we can finish the 2026 1099 filings. You can upload it through the link below.” If there is no reply within seven days, mark the vendor as missing a TIN in the close memo.

For a statement that closes in January, ask for the transaction export through the last day of 2026 rather than waiting for the statement.

For owner draws, ask for each owner's total by month from the bank records, plus any personal expense the business paid. Decision rule: a personal expense stays out of expense until the client confirms it is a business cost. Put it on the owner-activity schedule instead.

Late uploads break the cutoff. Put the cutoff date in the request title, not only in the body, so the reminder carries it.

Hand off to the 2026 returns

Give the preparer one package: the close memo, the final trial balance, the open-item list and the payroll tie-out. For an S corporation, the shareholder K-1 amounts come from Form 1120-S, so hold the K-1 review until the trial balance is final.

For a C corporation, the IRS instructions say the return is due by the 15th day of the fourth month after the end of the tax year. If the close slips, Form 7004 can request the automatic six-month extension, and it can be filed electronically for most returns. File it only when the trial balance will not be final by the regular due date.