Quick Answer
If you win a small-business set-aside, there's a rule that limits how much of that work you can hand off to a subcontractor. For most services and supply contracts, you can't pay outside subcontractors more than 50% of what the government pays you for the job. A lot of contractors have heard this as "51%." That's not right, and getting it wrong can put your award at risk. The good news: once you understand how it's actually calculated, it's very manageable to stay on the right side of it.
Key Takeaways
- The real number is 50%, not 51%, a myth that trips up even experienced contractors.
- Not every subcontractor counts against that limit. Some partnerships actually count in your favor.
- If you get this wrong, you're not just out of compliance. You could lose the contract to a protest.
- There's also a genuine upside: doing this right can protect you from a separate, related challenge too.
- This isn't a one-time math problem. It's something you track for the life of the contract.
Why This Trips Up So Many Small Businesses
Here's a situation that plays out all the time: a small business wins a great set-aside contract, brings on a bigger, more experienced subcontractor to help deliver the work, and everything looks fine, until a competitor files a protest questioning whether the small business is really the one doing the work.
That's where the "limitations on subcontracting" rule comes in. It's a federal requirement (you'll see it as FAR 52.219-14, or 13 C.F.R. § 125.6 if you go looking for it) that says a small-business prime contractor can't outsource more than a certain share of the work. For most services and supply contracts, that share is 50%. For construction, it's higher: 85% for general construction, 75% for specialty trade work.
The number that trips people up is 51%. It's repeated so often in the industry that a lot of contractors assume that's the rule. It isn't, and it never has been. The actual threshold is 50%, and it's measured against what the government actually pays you, not against your subcontractor's costs, which is how it used to be calculated years ago.
Why does this matter so much? Because if a competitor thinks you're relying too heavily on a subcontractor, they can challenge your award. If you can't show you're within the limit, you risk losing the contract altogether.
The Partners Who Don't Count Against You
Here's some good news: you're not expected to do everything yourself. The rule includes a category called a "similarly situated entity," basically, a subcontractor that shares your same small-business status (say, another SDVOSB, if that's your certification) and is also small under the same industry code as the work you're giving them.
Money you pay to one of these similarly situated partners doesn't count against your 50% limit. It counts as if you did the work yourself. So if you're a veteran-owned business teaming with another veteran-owned business, that relationship can actually help you stay compliant rather than work against you.
One thing to watch for, though: if your similarly situated partner turns around and subcontracts part of their piece to someone who doesn't share that same status, that spending does count against your limit, even though you never contracted with that second company directly. It's worth asking your teaming partners how they plan to staff their portion, not just assuming it's covered.
How the Math Actually Works
The 50% isn't calculated against the whole contract value. There are some things you get to leave out first.
- On supply and construction contracts, the cost of materials doesn't count.
- On services contracts, certain costs like travel, cloud computing, and media buys are excluded too.
And if your contract is a mix of services and supplies, the rule only applies to whichever part matches the industry code assigned to your contract, not the whole thing. This is one of the places contractors get tripped up on task orders that blend different types of work.
Staying Compliant Over Time (Not Just at Proposal Time)
Here's the part that catches people off guard: this isn't something you calculate once when you write your proposal and then forget about. Compliance is measured over the life of the contract, or separately for each option year or task order. That means your subcontracts, invoices, and teaming agreements need to line up with the real numbers as the work happens, not just your original estimate.
If a protest does come in, you'll want your paperwork ready to go quickly, since the appeal windows with SBA's Office of Hearings and Appeals are short. And here's the encouraging part: since 2023, being able to show you're compliant with this rule can actually help defend you against a related kind of challenge (called an "ostensible subcontractor" claim) that questions whether you're really the one running the show. It's not a guarantee you'll win a protest, but it gives you real evidence to stand on instead of scrambling to explain yourself after the fact.
One more reason to take this seriously: certifying compliance when you're not actually compliant can create exposure under the False Claims Act, including real financial penalties. It's not just a technicality. It's worth doing right.
FAQ
Is it really 50%, or is it 51%?
It's 50%. The 51% figure is repeated so often that many contractors assume it's correct, but it doesn't appear anywhere in the actual regulation.
If I subcontract to another small business, does that automatically count in my favor?
Not automatically. It only counts if that subcontractor shares your small-business status (e.g., both are SDVOSB or both are WOSB) and is small under the same industry code. A small business that doesn't match your status counts against your limit just like any other subcontractor.
Does this rule apply to smaller contracts too?
For general small-business set-asides, it usually kicks in above $250,000. But for certification-based set-asides like 8(a), SDVOSB, or WOSB, it can apply even below that number, so don't assume a smaller contract is automatically off the hook. Check your specific solicitation.
What if I can't hit the percentage because of how I source my products?
There's a separate path called the nonmanufacturer rule that may apply, and in some cases SBA can grant a waiver. These aren't automatic, though. They're worth confirming with SBA before you count on them.
Next Steps
If you're about to team up with a subcontractor on a set-aside, it's worth running the numbers before you sign anything. Figure out your actual limit, confirm which partners count in your favor, and set up a simple way to track it as the contract moves forward, not just at the proposal stage. If keeping tabs on subcontractor status and spending feels like one more thing on your plate, USFCR's Vendor Management and Vendor Intelligence support can help you track it throughout the life of the contract, so you're not caught off guard later.
