How to Invoice as a HVAC Technician in St. Louis, MO

Invoicing guide for hvac technicians in St. Louis: 4.225% MO sales tax, 0.75%/mo late-fee cap, plus MO licensing and contractor rules.

Combined sales tax
4.225%
Late fee cap
0.75%/mo
Net terms
7 days
Deposit
25%
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1. St. Louis-specific tax handling

  • State sales tax: 4.225%. Local jurisdictions in St. Louis may add their own rate — verify with your local tax assessor.
  • Late fees: MO statute Mo. Rev. Stat. §408.020 caps interest on unpaid invoices at 1.5% per month.

2. Standard hvac technician line items

  • Diagnostic fee — billed by flat (~$89 default).
  • Labor — billed by hour (~$115 default).
  • Refrigerant / parts — billed by itemized.
  • Service agreement credit — billed by discount.

3. Payment terms that work in St. Louis

Net 7 is standard for hvac technicians. Most hvac technicians in competitive markets like St. Louis require a 25% deposit upfront before scheduling work. Accept card and ACH on the invoice itself — St. Louis customers expect a one-click payment link in their inbox.

4. Licensing & disclosures

EPA Section 608 certification required for refrigerant work. State HVAC licenses common.

Metro
St. Louis
State
MO
Net terms
7 days
Deposit
25%

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