How to Invoice as a HVAC Technician in Michigan

How to invoice as a hvac technician in Michigan: MI sales tax 6.00% (services usually exempt), late fees capped at 1.5%/mo under Mich. Comp. Laws §438.31, written contracts required over $600. Step-by-step guide with a free template.

State sales tax
6%
Late fee cap
1.5%/mo
Net terms
7 days
Deposit
25%
Create your first invoice freeSee pricing

1. Michigan-specific invoice requirements

  • Sales tax line: 6.00% state rate. Most services rendered in Michigan are exempt from sales tax — but materials, parts, and tangible goods are not. State 6%; uniform statewide. No local sales tax.
  • Late-fee cap: Michigan statute Mich. Comp. Laws §438.31 caps interest on unpaid invoices at 1.5% per month. Spell out the rate in writing on every invoice and in your contract — courts won't enforce undisclosed fees.
  • Written contract required: Michigan requires a signed agreement for any job over $600. Reference the contract number on the invoice.
  • Right-to-cancel notice: Customers in Michigan get 72-hour cancellation rights on certain home-services contracts. Disclose this in your terms.

2. HVAC Technician line items + standard terms

Every hvac technician invoice in Michigan should itemize work clearly. Standard hvac technicians use Net 7 terms with a 25% deposit required upfront.

  • 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. HVAC Technician licensing in Michigan

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

4. Send and follow up

Send the invoice the same day work completes. Use software that records open events and offers a one-click online payment so you don't need to chase a check by mail. Michigan customers expect digital payment options today — accepting card and ACH typically reduces days-to-paid by 30–50%.

Average invoice
$540
State
MI
Net terms
7 days
Deposit
25%

Michigan metro guides

Metro-specific guides include the combined sales-tax rate and local pricing benchmarks.

Related