How to Invoice as a Civil / Mechanical / Electrical Engineer (PE) in Longview, WA

Invoicing guide for civil / mechanical / electrical engineer (pe)s in Longview: 6.5% WA sales tax, 1%/mo late-fee cap, plus WA licensing and contractor rules.

Combined sales tax
6.5%
Late fee cap
1%/mo
Net terms
30 days
Deposit
25%
Create your first invoice freeSee pricing

1. Longview-specific tax handling

  • State sales tax: 6.5%. Local jurisdictions in Longview may add their own rate — verify with your local tax assessor.
  • Late fees: WA statute Wash. Rev. Code §19.52.020 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 Longview

Net 30 is standard for civil / mechanical / electrical engineer (pe)s. Most civil / mechanical / electrical engineer (pe)s in competitive markets like Longview require a 25% deposit upfront before scheduling work. Accept card and ACH on the invoice itself — Longview 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
Longview
State
WA
Net terms
30 days
Deposit
25%

Nearby metros

Related