Commercial HVAC Contracts: Net 30 Terms and What They Do to Your Cash

5 min read · Cash Flow, Revenue

The short answer

Net 30 terms mean a commercial customer has 30 days to pay an invoice after the work is done, and in practice many commercial accounts stretch that closer to 45 or 60 days. That gap is manageable if you plan for it: price it into the job, watch your AR aging closely, and keep enough cash on hand to cover the wait. Ignore it, and commercial work, which often looks like the more stable revenue, can be the very thing that drains your cash.

Key takeaways

• Net 30 rarely means 30 days in practice. Plan for longer.
• Commercial revenue is not free of cash flow risk just because it is steady.
• Price the payment delay into your bid, not just the labor and materials.
• Weekly AR aging review catches slow payers before they become a real problem.

Why commercial accounts feel safe but aren't

Commercial contracts often come with the promise of steady, recurring work, and that is genuinely valuable. But steady does not mean fast. A property management company or a general contractor on Net 30 terms may run their own payables on a 45 or 60 day internal cycle, meaning your invoice sits in a queue regardless of how clean it is. If your pricing and cash planning assume a 30 day payment, you are planning around a number that rarely happens.

How to price around the delay

Factor payment terms into your bid, not just your cost estimate. A job with realistic Net 60 terms ties up your cash twice as long as a Net 30 job of the same size, and that has a real cost. Some contractors build in a small premium for longer payment terms or offer a discount for faster payment. Either approach beats pretending the delay does not exist.

Managing the accounts once the work is done

Invoice the day the job is complete, not at the end of the month. Track each commercial account's actual average payment time, not just their stated terms, so you know who really pays in 30 days and who does not. Review AR aging weekly during your busiest months, because a slow-paying commercial account can tie up cash right when you need it most for materials and payroll on other jobs.

Frequently asked questions

Should I charge commercial customers differently than residential?

Payment terms are a real cost, so it is reasonable to factor them into commercial pricing even if labor and material costs are similar to residential work.

How do I know if a commercial account pays slowly?

Track actual payment dates against invoice dates in Xero over several jobs. Stated terms and actual behavior are often different.

Can I require a deposit on commercial work?

Often yes, especially for larger jobs. It depends on the account and contract terms, but it is worth negotiating upfront.

Steady work should not mean stalled cash

911 Bookkeepers helps HVAC contractors track commercial AR and price around payment terms so growth does not starve your cash flow. Book a free books review at https://911bookkeepers.com or call (225) 274-6576.

Jeremy Brewer is the founder of 911 Bookkeepers LLC in Baton Rouge, Louisiana. He came up through the HVAC trade and works as a licensed paramedic in EMS. He is a Xero Certified Advisor. 911 Bookkeepers is built for the trades.