How to Invoice as a Cybersecurity Consultant in St. Louis, MO

Invoicing guide for cybersecurity consultants 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
30 days
Deposit
33%
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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 cybersecurity consultant line items

  • Penetration test — fixed scope — billed by flat.
  • Hourly assessment — billed by hour (~$245 default).
  • Retest — billed by flat.
  • Retainer / vCISO — billed by flat.

3. Payment terms that work in St. Louis

Net 30 is standard for cybersecurity consultants. Most cybersecurity consultants in competitive markets like St. Louis require a 33% 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

CISSP, OSCP, or equivalent expected. ROE (rules of engagement) and signed authorization required before any testing.

Metro
St. Louis
State
MO
Net terms
30 days
Deposit
33%

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