When you win a small business set-aside — 8(a), SDVOSB, WOSB, HUBZone, or a general small business set-aside — you take on an obligation that’s easy to overlook until it bites: the limitations on subcontracting. Get it wrong and you risk a nonresponsibility determination, a protest, or worse.

This is the rule in plain English.

What the rule requires

The limitations on subcontracting (FAR 52.219-14, implementing 13 CFR 125.6) cap how much of a set-aside contract you can hand to firms that aren’t small. The cap is measured by the percentage of the award amount you pay to subcontractors, and it varies by contract type:

  • Services: you may not pay more than 50% of the amount paid by the government to subcontractors that are not similarly situated. In other words, your firm (plus similarly situated subs) must perform at least 50%.
  • Supplies (other than from a non-manufacturer): the same 50% limit applies, excluding the cost of materials.
  • General construction: you may not subcontract more than 85% — you must self-perform at least 15%.
  • Specialty trade construction: you may not subcontract more than 75% — you must self-perform at least 25%.

Note the modern framing: the rule is written as a limit on what you pay out, not a requirement to track your own labor cost. That change (from the older “cost of personnel” formulation) made compliance easier to measure.

The similarly situated entity exception

Here’s the part that makes teaming work. A similarly situated entity is a subcontractor that:

  1. Has the same set-aside status as the prime for that contract (e.g., both are SDVOSB on an SDVOSB award), and
  2. Is small under the NAICS code the prime assigned to the subcontract.

Work performed by a similarly situated sub does not count against the subcontracting limit. It’s treated, for the math, as if the prime performed it.

That’s why your teaming strategy matters as much as your capabilities: pairing with a similarly situated partner lets you pursue larger or more specialized work without breaching the limit. Pairing with a large partner does the opposite — every dollar to them counts toward your cap.

A worked example

Say you win a $1,000,000 services set-aside.

  • You must ensure that no more than $500,000 goes to non-similarly-situated subcontractors.
  • If you subcontract $400,000 to a similarly situated small partner and $150,000 to a large firm, only the $150,000 counts against the limit. You’re compliant.
  • If instead you subcontract $600,000 to a large firm, you’ve breached the 50% limit — even though you “only” subcontracted 60% — because none of it qualifies for the exception.

How compliance is checked

Contracting officers can require you to certify compliance, and the determination can be made at the contract level (or, for orders, as specified). Compliance is also a frequent protest ground: competitors scrutinize teaming arrangements precisely because a violation can disqualify an awardee. Document your subcontracting plan and your similarly situated relationships before award, not after.

Practical takeaways

  • Run the math before you team. Know your contract type and its threshold, then model the dollar split.
  • Prioritize similarly situated partners when the work would otherwise push you over the limit.
  • Keep the documentation. Subcontract agreements should make set-aside status and NAICS size explicit so you can prove the exception applies.
  • Re-check on modifications. Scope and dollar changes can shift the percentages.

If you’re an 8(a) firm, this rule interacts directly with the program’s set-aside advantages — see our guide to the SBA 8(a) program.

This article is general information, not legal advice. The regulations change and apply differently by contract type and agency; verify the current FAR/13 CFR text or consult qualified counsel before relying on it.