Deadlines Are Approaching
If you filed for a tax extension this year, September and October are important months to have on your radar.
While a tax extension can give you more time to get your return filed, it does not give you more time to pay taxes you owe. And as the deadline approaches, having accurate, organized financial records can make the difference between a smooth tax-filing process and a stressful scramble to pull everything together.
For small business owners searching for a “bookkeeper near me” or trying to decide whether to bring one on before deadline crunch time, this is exactly the moment that decision pays off.
What Are the 2026 Tax Extension Deadlines?
For many business owners, September 15, 2026 is an important extended tax deadline.
Calendar-year partnerships filing Form 1065 and S corporations filing Form 1120-S generally have until September 15 if they timely requested an extension. (IRS) September 15th is also the deadline for your third-quarter 2026 estimated tax payment.
Then comes October 15, 2026, which is the extended filing deadline for many individual taxpayers and calendar-year C corporations that timely requested an extension. (IRS)
Of course, tax deadlines can vary depending on your business structure and circumstances, so it is always a good idea to confirm your specific deadline with your tax professional.
And remember: an extension to file is not an extension to pay. If you owe taxes, the IRS generally still expects payment by the original deadline. (IRS)
An Extension Gives You More Time—But Not Less Work
It can be tempting to look at a tax extension as simply pushing the problem down the road.
But eventually, the books still need to be reconciled. Transactions still need to be categorized. Credit card and bank accounts still need to match. Business expenses need to be properly recorded, and your tax professional needs accurate financial information to prepare your return.
That is why the months leading up to an extended tax deadline can be a great time to take a closer look at your small business bookkeeping.
If your books are behind, now is the time for catch-up bookkeeping—not when your tax professional is asking for everything a few days before the deadline.