This question comes up constantly once an HVAC business starts generating real profit, and the honest answer is that it depends on your numbers, not a blanket rule that applies to every contractor at the same revenue level.

Here's the core mechanic. As a sole proprietor or single-member LLC, all of your business profit is subject to self-employment tax, currently 15.3 percent, on top of regular income tax. As an S-corp, you pay yourself a reasonable salary through payroll, which is subject to that same 15.3 percent, but any additional profit distributed to you as the owner isn't subject to self-employment tax. That difference is where the savings come from.

The catch is the word "reasonable" in reasonable salary. The IRS expects you to pay yourself a salary that reflects what the work you're doing would actually cost to hire out, not an artificially low number designed purely to shift more income into the tax-advantaged distribution category. Get this wrong and you're creating exposure in an audit, not saving money.

S-corp status also isn't free to maintain. You're now running actual payroll, which means payroll processing costs and payroll tax filings that didn't exist before. There's additional tax return complexity, generally requiring a separate business return. For a business with modest profit, those added costs can eat up most or all of the potential tax savings, which is exactly why this isn't a decision that makes sense for every contractor at every stage.

As a general guideline, the math tends to start favoring S-corp status once net profit is consistently well above what a reasonable salary for the work would be, often somewhere in the range of $60,000 to $80,000 in profit, though your specific numbers matter more than any rule of thumb.

This isn't a decision to make off a general guideline alone. It requires running your actual numbers, both the tax savings and the added administrative cost, side by side.

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.