October matters for small business bookkeeping because October 15 is the final deadline for anyone who filed a tax extension back in April, and it’s also the last clear stretch before contractor 1099 prep, holiday-season cash flow, and year-end close all land at once. Business owners who use October to close out the extension, verify contractor records, and map out Q4 avoid walking into November already behind.
Here’s what to check this month, why October is different from the rest of Q4, and how to set up a clean finish to the year.
Why October Is a Second Deadline Month
Most months of Q4 are about looking forward — Q4 planning, holiday prep, year-end strategy. October is unusual because it also marks the end of something from the spring: the extended tax deadline. That makes it a two-part month.
- Anyone who filed an extension in April has a hard deadline to actually file by October 15.
- At the same time, this is the natural point to start contractor and 1099 prep for January, since the window to catch a missing W-9 shrinks fast once the holidays hit.
1. Confirm Your Extended Return Is Filed and Accurate
If you or your business filed a six-month extension in April, October 15 is the actual filing deadline — not another extension point. Missing it can trigger penalties calculated back to the original due date, even though the extension bought extra time to file.
What to check before filing
- Confirm every account is fully reconciled through the end of the prior tax year, not just up to the extension date.
- Review that all deductible expenses were captured, since rushed cleanup work tends to miss write-offs that a slower, reconciled process would have caught.
- Double-check that any estimated payments made earlier in the year are correctly applied to the return.
- If your books still aren’t current enough to file confidently, that’s the priority this week. Filing from incomplete records is how businesses end up amending later.
2. Start Contractor and 1099 Prep Now, Not in January
1099-NEC forms are due to contractors by January 31, but the information needed to prepare them correct names, addresses, and W-9s is far easier to collect in October than it is during the holiday rush or the first scramble of the new year.
What to pull together this month
- A list of every contractor paid $600 or more so far this year.
- A current W-9 on file for each one missing or outdated W-9s are the single most common cause of 1099 delays.
- Confirmation of how each contractor was paid, since payments made entirely through a third-party processor like PayPal or Stripe may be reported by the processor instead of requiring a 1099 from you.
3. Review Q3 Numbers Against Your Annual Plan
With Q3 fully closed, October is the first real chance to see nine months of complete data against your annual goals. This review tends to be more reliable than a September check-in, since the quarter is finished rather than still in progress.
Questions worth asking
- Did Q3 Taxes come in ahead of, on pace with, or behind plan?
- Are there expense categories that ran high over the summer that need attention before Q4 spending ramps up?
- Based on last year’s pattern, what does your business’s Q4 cash flow typically look like?
- Is there a year-end purchase or investment that needs to happen before December 31 to count for this tax year?
4. Build Your Q4 Cash Flow Plan
For many Triangle-area businesses, Q4 brings uneven cash flow a holiday sales surge for retail, slower collections for service businesses as clients wrap up their own year-end, or both at once. A simple month-by-month cash flow projection for October through December makes those swings predictable instead of stressful.
5. Get Payroll Ready for Year-End Reporting
October is a good checkpoint to confirm payroll records are accurate before W-2 and year-end reporting season begins. Verify current employee addresses and withholding elections, reconcile payroll tax deposits made so far this year, and flag any mid-year hires, terminations, or benefit changes that need to be reflected correctly before forms are generated in January.
Frequently Asked Questions
What happens if I miss the October 15 extended tax deadline?
Missing the extended deadline can trigger a failure-to-file penalty calculated from the original April due date, even though the extension delayed the filing date itself. Filing as soon as possible after a missed deadline generally limits how much the penalty grows.
Do I need a 1099 for every contractor I paid this year?
Generally, a 1099-NEC is required for any contractor paid $600 or more during the year, with some exceptions for payments made through third-party processors that handle their own reporting. A bookkeeper can review your specific payments to confirm what’s required.
Is October too early to start 1099 prep?
No, October is actually the ideal window. Starting now leaves time to track down missing W-9s or correct outdated contractor information before the January 31 filing deadline, when last-minute requests are much harder to resolve.
Why does my October tax deadline matter if I already filed an extension?
An extension only moves the filing deadline, not the payment deadline and October 15 is the final point by which the actual return must be filed. Treating it as optional or informal can lead to real penalties.
Should I review my books before year-end even if I’m not behind?
Yes. A fall review, even for businesses with current books, is the best opportunity to catch small issues, plan year-end purchases for tax purposes, and walk into January with a clean starting point instead of untangling the prior year under deadline pressure.
The Bottom Line
October closes one deadline and opens the runway to the next one: contractor reporting, year-end close, and tax planning all trace back to decisions made or missed this month. Businesses that use October to file cleanly, confirm contractor records, and map out Q4 tend to spend December planning instead of catching up.