Don't Wait Until January: Start Your Year-End Tax Prep This October

Every missing W-9 in your vendor file right now is a penalty waiting to happen — up to hundreds of dollars per form, multiplied across every contractor you paid this year. The good news: with about 17 weeks until the January filing deadlines, October is the perfect moment to fix all of it calmly, before holiday schedules and unresponsive vendors turn a manageable cleanup into a January scramble.

This guide walks through a practical October start to year-end tax prep: sweeping your vendor list for W-9s, cleaning up your books, reconciling early, and building a 1099 filing calendar while you still have time to act on what you find.

Why October Beats December​

Most small businesses start thinking about 1099s sometime in January, when the deadline is weeks away and half their contractors have stopped answering email. Everything about that timing works against you:

• Chasing W-9s takes weeks, not days. Vendors move, change bookkeepers, or simply ignore your first two requests. Starting in October gives you three monthly follow-up cycles before year-end.
• The reporting threshold changed this year. For payments made in 2026, the 1099-NEC and 1099-MISC threshold jumped from $600 to $2,000 per payee — the first update since 1954. Your vendor list needs re-scoping: some payees fall off, and borderline cases need a full-year payment tally you can only run if your books are current.
• Book errors compound. A miscategorized contractor payment in March is a five-minute fix in October and a panicked reconstruction in January, when your accountant is billing peak-season rates.
• Penalties stack per form. The failure-to-file penalty applies to each information return, not each filing season. Ten sloppy forms cost ten times the penalty of one.

An hour a week from now through December replaces a miserable week in January. Here is where to spend it.

Step 1: Run a W-9 Sweep on Every Vendor​

The W-9 — the form where a vendor certifies their legal name, address, and taxpayer identification number — is the foundation of every 1099 you file. No W-9 on file means you are guessing at the name-and-TIN combination the IRS will match against its records, and guesses generate notices.

Pull a year-to-date payment report from your accounting system, grouped by vendor, and flag everyone who might need a 1099: independent contractors, freelancers, landlords receiving rent, attorneys, and any unincorporated business you paid for services. Then check which ones already have a signed W-9 on file. The gap between those two lists is your October project.

Apply the New $2,000 Threshold​

Under the One Big Beautiful Bill Act, businesses only need to file Form 1099-NEC or 1099-MISC for payees who received $2,000 or more in calendar year 2026. Starting in 2027, that figure adjusts for inflation each year.

That change cuts many small businesses' form counts substantially — but do not assume anyone off the list yet. Run the actual year-to-date totals, add a realistic estimate for November and December payments, and keep collecting W-9s from anyone plausibly near the line. A vendor at $1,700 in October with one more invoice coming will cross $2,000 by Christmas. Collecting the form now costs you an email; discovering the gap in January costs you a late filing.

Note the exceptions that survive the threshold change: backup withholding still applies regardless of amount, and royalties of $10 or more still trigger a 1099-MISC. When in doubt, collect the W-9. An unneeded form in your files costs nothing.

What to Do When Vendors Won't Respond​

Send the request three times — email in October, follow-up in November, final notice in early December — and document every attempt. If a vendor still has not furnished a TIN, the rules require you to start backup withholding at 24% on reportable payments and remit it to the IRS on Form 945, the annual return of withheld federal income tax, due January 31.

Backup withholding is not a punishment; it is your legal shield. A payer who withholds and remits correctly has complied even without the vendor's cooperation. A payer who keeps paying in full with no TIN on file owns the resulting mismatch notices and penalties. Going forward, adopt the policy every experienced bookkeeper recommends: no signed W-9, no first payment. New vendors complete the form during onboarding, before any money moves.

Step 2: Clean Up Your Vendor List​

While the W-9 requests are in flight, use the same vendor report to fix the master list itself. Years of quick entries leave every small business with a vendor file full of traps:

• Duplicates. "Acme Design," "Acme Design LLC," and "acme" as three separate vendors split one payee's payments across three records — each under the threshold individually, over it combined. Merge them now, while you can still verify which entity you actually paid.
• Miscategorized payees. Corporations generally do not receive 1099s for services, with notable exceptions for attorneys and medical providers. Confirm entity types against the W-9s you collect rather than trusting memory.
• Personal mixed with business. Payments to friends, reimbursements run through the wrong account, and personal expenses sitting in business categories all distort your totals. Move personal items out of the business books entirely.
• Uncategorized transactions. Every "Uncategorized" or "Ask My Accountant" entry is a deduction you cannot claim and a payment total you cannot trust. Clear the backlog through September at minimum.

This is also the moment to verify mailing addresses. A correct 1099 sent to a stale address still counts as furnished on time in most cases, but returned mail in February creates exactly the fire drill you are trying to avoid.

Step 3: Reconcile the Books Through Q3​

Clean 1099s require clean books, and clean books require reconciliation — matching every bank and credit card account to its statement, line by line. If you are behind, October is your recovery window: reconcile January through September now, then stay current week by week through year-end.

As you reconcile, run a critical eye over the profit and loss statement:

• Duplicate expenses. The same charge entered twice — once by a bank feed, once by hand — overstates deductions and understates profit. Feeds and manual entry mixing is the most common cause.
• Negative numbers in odd places. A negative expense usually means a refund posted to the wrong account or a sign error. Each one deserves a thirty-second investigation.
• Stale or confusing categories. Merge one-transaction categories, rename cryptic ones, and make sure contractor payments sit in accounts you can report from cleanly. If pulling "total paid to each contractor" requires spreadsheet surgery, your chart of accounts needs attention before January, not after.

Reconciling through September also gives you something strategically valuable: a reliable nine-month profit picture while there is still time to act on it — timing equipment purchases, funding retirement accounts, or adjusting estimated tax payments before the January deadline for the fourth quarter.

Step 4: Get Payroll and Owner Records in Order​

Information-return season is not only about contractors. Use the same October energy on the payroll side:

• Verify W-2 inputs. Confirm full legal names, current mailing addresses, and Social Security numbers for every employee. A name-and-SSN mismatch delays W-2 processing and frustrates your team in January, when corrections compete with everything else.
• Review S corporation owner compensation. If you operate as an S corporation, owner-employees must receive reasonable compensation through payroll. Compare your salary against the work you perform and industry norms now — adjusting in the fourth quarter is straightforward, while defending an unreasonably low salary under audit is not.
• Revisit worker classification. Anyone you treated as a contractor all year should still look like a contractor under the current rules: behavioral control, financial control, and the nature of the relationship. Reclassifying in October lets you correct course prospectively; having the IRS reclassify for you later comes with back payroll taxes and penalties.
• Plan year-end bonuses deliberately. Bonuses earned this year generally must be paid within two and a half months after year-end to be deductible for this year. If a bonus is part of your plan, calendar the payment now instead of discovering the timing rule in March.

Step 5: Build Your 1099 Filing Calendar Now​

For payments made in 2026, the key dates fall in early 2027. Put them on the calendar today, with reminders two weeks ahead of each:

• February 1, 2027: Form 1099-NEC to recipients and the IRS. The statutory date is January 31, but January 31, 2027 falls on a Sunday, so the deadline shifts to the next business day. Both the recipient copy and the IRS filing share this date — there is no later e-file extension for the NEC.
• February 1, 2027: Form 1099-MISC recipient copies. Same weekend shift applies to the statements you furnish to payees (February 15 for boxes 8 and 10).
• March 2, 2027: Form 1099-MISC paper filing with the IRS. February 28, 2027 is a Sunday, so paper filers get the next business day.
• March 31, 2027: Form 1099-MISC electronic filing with the IRS. The e-file deadline stands on its own.

Two more calendar items most businesses miss. First, if you file ten or more information returns in aggregate, you must e-file rather than mailing paper — count every 1099 series form plus W-2s together, because the threshold aggregates across form types. The IRS e-files 1099s through its IRIS portal, and setting up an IRIS transmitter account takes time, so start enrollment in the fall rather than the last week of January. Second, many states impose their own 1099 filing requirements and deadlines on top of the federal ones; check each state where you have payees, because the federal-state combined program does not cover every form and every state.

Need more time? Form 8809 buys a 30-day extension — but only for filing with the IRS, not for furnishing recipient copies. The statements to your vendors are still due on time.

Mistakes That Trigger Notices (and How October Prevents Them)​

Knowing what generates IRS correspondence helps you prioritize the cleanup:

• Name-and-TIN mismatches. When the combination on your 1099 does not match IRS records, you receive a CP2100 or CP2100A notice — a B-notice — listing the problem payees. You must then solicit corrected W-9s within a short window and begin backup withholding on non-responders. The IRS offers a free TIN Matching service to validate combinations before you file; October is the time to run your vendor list through it.
• Missing or late forms. Notice 972CG proposes penalties for returns filed late, filed on the wrong media, or filed with missing or incorrect TINs. The penalty ladder runs from $60 per return for quick corrections to $130 and then $340 as delays lengthen (the figures for returns due in 2026; amounts for returns due in 2027 adjust slightly for inflation), with higher amounts for intentional disregard — and a matching penalty can apply separately for failing to furnish the recipient copy. Every figure multiplies by the number of bad forms.
• 1099s for the wrong payees. Filing unnecessary 1099s for corporations creates confusion and amended-form work; missing required ones for LLCs taxed as partnerships or sole proprietorships creates penalties. The W-9 tells you the entity type — another reason the October sweep comes first.
• Withheld but never deposited. If you backup-withhold during the year, those dollars must reach the IRS through Form 945 deposits. Withholding from a vendor and then forgetting to remit is worse than never withholding at all.

Your October Action Checklist​

Tape this to the wall (or pin it in your task manager) and work it one item per week:

1. Pull year-to-date payments by vendor and flag everyone near or above $2,000.
2. Send W-9 requests to every flagged vendor missing one; log the date of each request.
3. Merge duplicate vendors and fix entity-type errors in your vendor list.
4. Reconcile all bank and credit card accounts through September 30.
5. Review the profit and loss for duplicates, negatives, and uncategorized transactions.
6. Verify employee names, addresses, and Social Security numbers for W-2s.
7. Review S corporation owner salary and contractor classifications.
8. Start IRIS enrollment if you will e-file 1099s for the first time.
9. Run vendor name-and-TIN combinations through IRS TIN Matching.
10. Calendar every 2027 filing deadline with a two-week advance reminder.

Do that, and January becomes what it should be: reviewing accurate forms and clicking submit, instead of reconstructing a year of chaos under deadline pressure.

Keep Your Year-End Books Organized From the Start​

Year-end tax prep is mostly bookkeeping hygiene spread across the fourth quarter — reconciled accounts, a clean vendor list, and payment records you can report from with confidence. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data, so pulling contractor totals or verifying a year's worth of categorizations is a query away instead of a weekend project. Get started for free and see why developers and finance professionals are switching to plain-text accounting.