How to Invoice as a General Contractor in Boulder, CO

Invoicing guide for general contractors in Boulder: 2.9% CO sales tax, 1.5%/mo late-fee cap, plus CO licensing and contractor rules.

Combined sales tax
2.9%
Late fee cap
1.5%/mo
Net terms
30 days
Deposit
25%
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1. Boulder-specific tax handling

  • State sales tax: 2.9%. Local jurisdictions in Boulder may add their own rate — verify with your local tax assessor.
  • Late fees: CO statute Colo. Rev. Stat. §5-12-101 caps interest on unpaid invoices at 1.5% per month.

2. Standard general contractor line items

  • Mobilization — billed by flat.
  • Labor — billed by hour (~$85 default).
  • Materials — billed by itemized.
  • Subcontractor markup — billed by percent.

3. Payment terms that work in Boulder

Net 30 is standard for general contractors. Most general contractors in competitive markets like Boulder require a 25% deposit upfront before scheduling work. Accept card and ACH on the invoice itself — Boulder customers expect a one-click payment link in their inbox.

4. Licensing & disclosures

Most states require a general contractor license over a job-value threshold (varies $500-$50K). Bonding and insurance commonly required.

Metro
Boulder
State
CO
Net terms
30 days
Deposit
25%

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