The December panic is a scheduling problem. Most of what makes year-end painful is work that is only cheap while the year is still running: reconciling a month you can still remember, getting a receipt out of a supplier who still has it, asking a contractor for a W-9 while you still owe them money. Start in September and December shrinks to the handful of decisions that genuinely have to be taken before the year closes. The first two weeks of January then become a close instead of a rescue.
None of this is tax advice. We checked every date and dollar figure below in September 2026 against the IRS instructions for the 2026 forms.
Why the calendar decides the order
Year-end work comes in three kinds. The first gets more expensive every week you leave it. A bank line from March means nothing to you in February. The supplier who could have emailed a duplicate invoice in October has archived it by January. The contractor who would have sent a W-9 while an unpaid invoice sat between you has little reason to answer once you have paid them in full. None of this work has a deadline, which is why it slides.
The second kind has to happen before December 31, because the tax year closes on it. It covers whether you buy the van this year or next, which unpaid invoices you accept are not coming back, and what you own on the last day of the year. These take a conversation with whoever prepares your return, so raise them in November while that person can still pick up the phone.
The third kind cannot happen until the year is over: final December reconciliation, payroll totals, contractor totals. That work is quick if the first two kinds were done, and brutal if they were not.
Exhibit 1
Only one of the four phases is trapped by December 31.
September and October are for making the books true
Reconcile everything, and mean everything: the operating account, every card including the one nobody looks at, the payment processor, the personal card that has three business charges on it, the loan account whose balance nobody has checked since it was opened. The IRS's own recordkeeping guide puts this first too: reconcile the checking account until the bank statement, the checkbook and the books all agree.
September is the right month for it because a reconciliation that fails needs chasing, and in September you still have time to chase it. A month that will not balance usually means a duplicate, a missing transaction, or a coding error, and in September the answer is often one email away. The same break found on January 8 is a puzzle with no witnesses, and it sits between you and a return.
Then clear the holding pile: the uncategorized account, the ask-my-accountant bucket, the transactions somebody flagged and nobody came back to. Work through it while the person who spent the money still remembers what it was for. Categorize them from a bank line alone in January and you are guessing.
A business already running a fixed monthly bookkeeping rhythm has nothing to catch up on here. If yours does not, the autumn catch-up is the moment to start one, since you are doing the work anyway.
October and November go to chasing paper while the year is open
Two things to collect, and both get harder once the year is over. Receipts first. Anything large, anything paid in cash, anything on a personal card, anything where the bank line alone does not say what was bought. Ask for duplicates now, while the request still gets a same-week answer.
Then the W-9s. A W-9 is how you get a contractor's correct taxpayer identification number, which you need to file the information return that reports what you paid them. The IRS does not tell you when to ask for it; collecting it before the first payment is our practice. A contractor with an outstanding invoice returns the form the same day. A contractor you paid in full in July may take three weeks and two reminders, and you will be sending those reminders in the last week of January.
While you are in there, run the year's payments by vendor and total them. For work paid in 2026, a 1099-NEC is required once you have paid a contractor at least $2,000 in the year, and it is due to the contractor and to the IRS by February 1, 2027. The old $600 line no longer applies, and the $2,000 amount may be adjusted for inflation starting in 2027. Certain other payments, rent among them, carry the same $2,000 threshold on a 1099-MISC, which goes to recipients by February 1, 2027 and to the IRS on paper by March 1 or electronically by March 31, 2027. Your accountant can tell you which of your payments are on that list. Run the totals from your accounting package, or from the bank export if it cannot do it; the comparison we wrote this year covers which package suits which firm.
The filing method belongs in November too. If you file 10 or more information returns of any kind combined, W-2s and 1099s counted together, you must file them electronically, and that rule has applied since January 1, 2024. Ten adds up faster than owners expect, and the last week of January is a bad time to discover you need an account with a filing service that wants to verify your identity first.
Exhibit 2
Three questions decide whether a contractor gets a 1099-NEC.
December forces a handful of decisions
Start with receivables, because the collection work belongs in November and the decision belongs in December. Pull the aged list and go through it line by line. Anything genuinely late gets one more attempt while people are still at their desks, and a polite chasing sequence works better in the first week of December than in the third. Then decide, in writing, which invoices you no longer expect to collect. Whether a written-off invoice produces any deduction depends on how your business reports income, so hand your accountant the list with the decision already made and let them tell you what it means.
Next the fixed-asset list. Take whatever depreciation schedule your accountant used last year and walk it against reality. Assets sold, scrapped, or stolen are still sitting on that schedule until somebody says otherwise, and you are the one who knows the laptop was replaced in April. Add anything bought this year that was expensed by mistake.
Have the buying conversation before you buy. For tax years beginning in 2026 you can expense up to $2,560,000 of qualifying purchases under Section 179, with the limit phasing down above $4,090,000 placed in service. Separately, 100% bonus depreciation is back permanently for qualified property acquired after January 19, 2025. For a firm of five people those ceilings are irrelevant. The question is whether you need the thing, and what the cash costs you in January. A deduction changes the price of an asset you were going to buy anyway. It never makes one free, and December is full of salespeople who describe it as though it does.
Retirement contributions look like a December item and are not. A SEP-IRA can still be set up and funded as late as your return's due date including extensions. A solo 401(k) is stricter: a sole proprietor with no employees must adopt it by the filing deadline without extensions. Both give you more room than the calendar suggests, so raise them in December while there is still time to think about them.
The first two weeks of January
Reconcile December, finish payroll, finalize the contractor totals against the threshold, and send the whole thing to whoever prepares the return. If the autumn went as described, this is a short job.
Then the dates, which are the only part of this that nobody can move. The fourth estimated tax payment for 2026 is due January 15, 2027, and you can skip it if you file and pay in full by February 1, 2027. Treat January 15 as the date. W-2s for 2026 go to employees and to the Social Security Administration by February 1, 2027, because January 31 falls on a Sunday, and the 1099-NECs are due the same day. S corporation and partnership returns for 2026 are due March 15, 2027, and C corporation returns and Schedule C filers' Form 1040 are due April 15, 2027, both weekdays. Those last two dates are computed from the rule that pushes a weekend deadline to the next business day, since the IRS has not published a 2027 calendar yet.
Exhibit 3
One February date carries both the payroll and the contractor paperwork.
Last, file the year away properly. The IRS recordkeeping guide asks for supporting documents kept by year and by type, which is worth doing in January while you know what everything is. Retention runs three years by default, but six if you under-reported income by more than 25%, seven for a worthless-security or bad-debt claim, four for employment tax records, and indefinitely if you never filed a return at all.
Where this plan usually breaks
It breaks in the same place every time. Nobody disagrees with any of it, nobody puts it in a calendar, so September passes, then October, and the whole thing lands in December where it started. Give each phase a date, put the autumn work into the half-hour weekly slot you already run, and book the November conversation with your accountant now, while their diary is still open.
If the truthful answer is that the reconciliation has not been done since spring and nobody in the business is going to do it in September, that catch-up is what our bookkeeping work covers, and it is far cheaper to hand over in autumn than in the second week of January.