Q4 Starts Now: What HVAC Owners Should Fix Before December

Fall is here, and for an HVAC contractor it is the turn from cooling season to heating calls, with the slow stretch coming right behind it. A lot of contractors treat Q4 as something that starts in October, but the decisions that shape how the year closes, from truck purchases to subcontractor paperwork, need to happen now while there is still runway to act on them.

The first thing worth fixing is any gap between where your books currently stand and where they need to be for accurate year-end tax planning. If you've been behind on categorizing transactions or reconciling accounts, catching up now means your CPA is working with real numbers in December instead of scrambling through a backlog in January.

Next, look honestly at your year-to-date profit and compare it against what you expected when you set goals back in January. If you're ahead of plan, Q4 is the window to think about tax strategies that make sense with strong profit, whether that's an equipment purchase that makes sense operationally and also helps with depreciation, or increasing retirement contributions. If you're behind plan, Q4 is the time to understand why, while there's still a full quarter to try to close the gap or at least understand it clearly before the year closes.

This is also the point to start thinking seriously about 1099 preparation if you use subcontractors, since a contractor paid $2,000 or more in 2026 (the new Form 1099-NEC threshold, up from $600) needs a 1099 issued by the end of January, and gathering W-9 information now is far easier than chasing it down in a panic in early January when everyone's busy with their own year-end.

If you're considering any major equipment purchases before year-end for depreciation purposes, this is also the time to run those numbers, because a purchase made in December still needs to make operational sense, not just tax sense. Buying equipment purely to reduce a tax bill without a real business need for it rarely works out as well as it sounds on paper.

Fall isn't just a change in weather. For your business, it's the start of the stretch that determines how the whole year actually closes out.

Jeremy Brewer is the founder of 911 Bookkeepers LLC in Baton Rouge, Louisiana. He worked in the field as an HVAC tech before building books for the trades, and he serves as a licensed paramedic in EMS. He is a Xero Certified Advisor.