How to Invoice as a Civil / Mechanical / Electrical Engineer (PE) in San Antonio, TX

Invoicing guide for civil / mechanical / electrical engineer (pe)s in San Antonio: 6.25% TX sales tax, 1.5%/mo late-fee cap, plus TX licensing and contractor rules.

Combined sales tax
6.25%
Late fee cap
1.5%/mo
Net terms
30 days
Deposit
25%
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1. San Antonio-specific tax handling

  • State sales tax: 6.25%. Local jurisdictions in San Antonio may add their own rate — verify with your local tax assessor.
  • Late fees: TX statute Tex. Bus. & Com. Code §2.207; Tex. Fin. Code §302.002 caps interest on unpaid invoices at 1.5% per month.

2. Standard civil / mechanical / electrical engineer (pe) line items

  • Project fee — billed by flat.
  • Hourly engineering — billed by hour (~$175 default).
  • PE stamp & sealing — billed by flat.
  • Site visit — billed by flat.

3. Payment terms that work in San Antonio

Net 30 is standard for civil / mechanical / electrical engineer (pe)s. Most civil / mechanical / electrical engineer (pe)s in competitive markets like San Antonio require a 25% deposit upfront before scheduling work. Accept card and ACH on the invoice itself — San Antonio customers expect a one-click payment link in their inbox.

4. Licensing & disclosures

PE license required to stamp drawings or sign engineering opinions. Discipline-specific rules apply.

Metro
San Antonio
State
TX
Net terms
30 days
Deposit
25%

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