What is Sub-Vendor?

Last updated 2026-10-22

Short answer

A sub-vendor is a staffing firm that supplies consultants to a prime vendor or another vendor instead of directly to the end client.

Sub-Vendor is a term you will meet constantly in IT staffing. This page explains what it means, how it appears in postings and emails, how a staffing team uses it and the mistakes to avoid.

In practice

Sub-vendors work in the chain below a prime. They receive requirements from the vendor above them and submit candidates up the chain.

Each layer adds margin, so a sub-vendor’s bill rate is lower than the rate the end client pays.

How it shows up

The end client pays a prime at one rate. The prime pays a sub-vendor a smaller rate. The sub-vendor pays the consultant a rate that still leaves its own margin.

How a staffing team uses it

Work out your floor margin before you submit. In a long chain there may be little room, and it is better to know that first.

Common mistakes

  • Not asking how many layers sit above you.
  • Agreeing to a rate before checking your margin.
  • Submitting the same consultant through another vendor in the same chain.

Frequently asked questions

How do I know my position in the chain?

Ask who holds the contract with the end client and who you would invoice.