Total vs Partial Small Business Set Aside: 2026 Checklist

By Aoba Works · Published October 20, 2026 · 18 min read

How this guide was made: drafted with AI assistance from the official sources linked below, then passed an automated editorial check before publishing. Our process

• Sam.gov

A total small business set-aside reserves the whole contract for small businesses, so large companies can't bid at all. A partial small business set-aside splits the requirement into two parts. One part is reserved for small businesses, and the other part is open to everyone, large firms included. Your bid strategy depends on which part you can win and how much of the work you can do with your own staff. Under the subcontracting limits, a services prime can pay non-similarly situated subcontractors no more than 50% of what the government pays it (FAR 52.219-14).

One thing that often confuses people: current FAR text gives small businesses no general price evaluation preference on partial set-asides. The only small-business price preference in FAR Part 19 is the 10% HUBZone preference, and it applies in full and open competition (FAR 19.1307). The sections below show what this means for your bid.

Which option is right for you?

Start with the notice type that matches where your business is now, then open the official page listed in the table.

Here's why. Total set-asides are the simplest place to start because the competition and the rules are uniform across the whole contract. Partial set-asides reward firms that can scale, since you can win the reserved portion, the open portion, or both. Your subcontracting math decides whether either one is realistic for you.

A note on FAR section numbers in 2026

Older articles say "FAR 19.502-2" and "FAR 19.502-3". You'll now also see "19.104-1" and "19.104-2", and the reason is the FAR overhaul. The codified FAR on acquisition.gov still contains subpart 19.5. Under the Revolutionary FAR Overhaul, though, agencies have issued class deviations that move total set-aside rules to 19.104-1 and combine both kinds of partial set-aside rules into 19.104-2 (Acquisition.gov FAR Overhaul Part 19; NASA deviation memo). As of October 2026, formal rulemaking for Part 19 had not been finalized (Lohfeld Consulting). The substance is largely the same. Always cite the clause numbers printed in your solicitation.

What Is a Total Small Business Set-Aside? (FAR 19.5 Definition)

A total set-aside reserves the entire acquisition for small businesses when the rule of two is met, and no large business can compete. In the rule of two, the contracting officer expects at least two responsible small businesses to submit offers that are competitive on fair market price, quality and delivery (FAR 19.502-2).

The codified rule has two dollar tiers:

• Above the micro-purchase threshold, up to the simplified acquisition threshold (SAT): the acquisition is set aside automatically unless the contracting officer finds no reasonable expectation of offers from two or more responsible small businesses. If only one acceptable small business offer arrives, the CO should award to that firm. If none arrive, the set-aside is withdrawn and the requirement is resolicited on an unrestricted basis (FAR 19.502-2).
• Above the SAT: the CO "shall set aside" the acquisition when the rule-of-two expectation exists. Past acquisition history and market research count, but they aren't the only factors (FAR 19.502-2).

As of October 2026, the micro-purchase threshold is $15,000 and the SAT is $350,000. Both were raised on October 1, 2025, from $10,000 and $250,000 (Pillsbury summary of the FAR inflation adjustment; check the FAR 2.101 definitions for current values). The overhaul version states the rule as applying to contracts "above the micro-purchase threshold" (FAR Overhaul Part 19).

Example (illustrative): an agency needs janitorial services for one building for $600,000 a year. Market research turns up five small janitorial firms that had similar contracts. The CO sets the whole requirement aside. On SAM.gov the notice shows "Total Small Business Set-Aside (FAR 19.5)", which is set-aside code SBA in the SAM.gov Opportunities API.

Pitfalls and fixes

• Pitfall: assuming you're small because you're small in general. Fix: size is measured against the NAICS code in the solicitation as of the date you submit your initial offer with price (13 CFR 121.404).
• Pitfall: treating a total set-aside as a chance to win and then hand most of the work to a large partner. Fix: the limitations on subcontracting still apply. See the 51% rule section below.

What Is a Partial Small Business Set-Aside?

A partial set-aside reserves one or more distinct portions of a requirement for small businesses and leaves the rest open to all offerors. COs use it when a total set-aside isn't appropriate but part of the work still passes the rule of two (FAR 19.502-3).

Under codified FAR 19.502-3(a), the CO shall partially set aside when all of the following are true:

1. Market research shows a total set-aside isn't appropriate.
2. The requirement can be split into distinct portions.
3. The acquisition isn't using simplified acquisition procedures.
4. Two or more responsible small businesses are reasonably expected to offer competitively on the set-aside portion.
5. The program eligibility requirements apply.
6. The result won't be a multiple-award contract. Multiple-award partial set-asides were in 19.502-4 and are now combined into 19.104-2 under the overhaul.

The codified text also excludes construction from partial set-asides (FAR 19.502-3). The solicitation has to say which portions are set aside and which aren't, and how to submit offers for each one (FAR 19.502-3(b)–(c)).

Example (illustrative): a supply solicitation has 10 contract line items (CLINs). CLINs 0001–0006 are high-volume items that only a few large manufacturers can supply at scale. CLINs 0007–0010 are low-volume items that several small distributors already sell. The CO might leave 0001–0006 unrestricted and set aside 0007–0010. On SAM.gov the notice appears as "Partial Small Business Set-Aside (FAR 19.5)", code SBP (SAM.gov Opportunities API).

Pitfalls and fixes

• Pitfall: pricing only the set-aside CLINs because you assume the unrestricted portion is out of reach. Fix: the FAR 52.219-7 clause lets small businesses compete for both portions, either with separate offers or one combined offer. Decide on purpose instead of by habit.
• Pitfall: skipping Section L (or the instructions to offerors). Fix: the CO must tell you how to submit for each portion. If you use the wrong format, a good price can be thrown out.

Total vs Partial Set-Aside: Side-by-Side Comparison

The main differences are who can compete on each part, how the requirement is divided, and which rules your offer must meet. This table shows them side by side.

Sources for the rows: FAR 19.502-2, FAR 19.502-3, FAR 52.219-7, FAR 19.1307.

What Is the 51% Rule for Small Business Set-Asides?

The "51% rule" is an old nickname. Today's rule caps how much of the contract money you can pay to subcontractors that aren't similarly situated. For services and supplies the cap is 50% (13 CFR 125.6; FAR 52.219-14, Oct 2022 version).

The rule measures money paid out, not hours worked. The current limits are:

A similarly situated entity is a first-tier subcontractor that has the same small business program status as you and is small under the NAICS code assigned to the subcontract. Work it performs with its own employees doesn't count against your cap (FAR 52.219-14).

Example (illustrative): you win a $1,000,000 total small business set-aside for IT help desk services. You plan to pay $300,000 to a large company for tier-2 support and $250,000 to another small business for on-site staff. Only the $300,000 counts toward the cap, so you're at 30%, well under 50%. Now suppose the "small" partner is actually large under the subcontract's NAICS code. Then you're at 55%, and you're out of compliance.

Compliance is generally measured over the base term and then over each option period separately (13 CFR 125.6(c)). The penalty is steep: the greater of $500,000 or the amount paid to subcontractors above the allowed level (13 CFR 125.6).

Pitfalls and fixes

• Pitfall: checking compliance only for the whole contract. Fix: run the numbers separately for the base year and for each option year in your pricing spreadsheet.
• Pitfall: relying on a teaming partner's word that it's small. Fix: look up its SAM.gov entity record and check its size under the subcontract's NAICS code. Primes may usually rely on a subcontractor's self-certification unless they have reason to doubt it (13 CFR 121.404), but the risk is still yours if the certification turns out to be wrong.
• Pitfall: if you're a nonmanufacturer on a supply set-aside, offering a large manufacturer's product without a waiver. Fix: the nonmanufacturer rule generally requires products from small business manufacturers unless a waiver applies (13 CFR 125.6(a)(2)).

How Does the Rule of Two Determine Which Set-Aside Applies?

The contracting officer runs market research to see whether two or more responsible small businesses can perform at a fair price. That result decides whether the buy is a total set-aside, a partial set-aside, or unrestricted (FAR 19.502-2; FAR Overhaul 19.104-1).

From the CO's side, the decision usually goes like this:

1. Market research. The CO reviews past awards, searches SAM.gov entity data, and often posts a Sources Sought or RFI notice on SAM.gov.
2. Rule of two for the whole requirement. If two or more capable small businesses are expected to offer, the result is a total set-aside. The overhaul text keeps this as a "must."
3. If that fails, check for divisible portions. If some portions pass the rule of two and the codified 19.502-3 conditions are met (not construction, not simplified procedures), the result is a partial set-aside.
4. If nothing passes, the buy goes unrestricted, and the CO documents why it wasn't set aside. SAM.gov may label it "No Set aside used". SBA can recommend a set-aside, and a CO who rejects that recommendation has to follow a set procedure (FAR Overhaul Part 19).

What this means for you: step 1 is where you can affect the outcome. If you answer a Sources Sought notice with a clear capability statement showing relevant past performance, you become one of the "two" the CO is counting. A short, specific response does more than a brochure. The capability statement example guide covers the five sections buyers read first.

Pitfalls and fixes

• Pitfall: ignoring Sources Sought notices because "they aren't real contracts." Fix: treat them as the stage where the set-aside type is decided, and answer the questions exactly as the notice asks.
• Pitfall: answering an RFI without saying whether you would bid as a prime. Fix: state your size under the stated NAICS code, whether you would prime, and what portion of the work you would do yourself.

What Is the Price Evaluation Preference in Partial Set-Asides?

Current FAR text gives small businesses no general price evaluation preference on either portion of a partial set-aside. Small offers on the set-aside portion compete only against other small offers. The only Part 19 price preference is the 10% HUBZone factor, and it applies in full and open competition (FAR 52.219-7; FAR 19.1307).

Some guides say small businesses get a price adjustment on the open portion of a partial set-aside. The official text doesn't support that. Here's what does apply:

• Set-aside portion: you're evaluated only against other small businesses. Large business offers on this portion are rejected as nonresponsive (FAR 19.502-3(d)).
• Non-set-aside portion: this is open competition. If you're a certified HUBZone firm and the solicitation includes FAR 52.219-4, the CO adds 10% to the prices of offerors that aren't HUBZone or otherwise successful small business offerors. The adjustment is for evaluation only, and you're paid your actual price (FAR 19.1307).
• When the HUBZone preference does not apply: when price isn't a selection factor (for example, architect-engineer buys), when all fair and reasonable offers are accepted (for example, Multiple Award Schedule contracts), and on the reserved portion of a multiple-award solicitation (FAR 19.1307).

Example (illustrative), HUBZone on the open portion: a HUBZone firm offers $100,000 on the open CLINs. A large business offers $95,000. For evaluation only, the large offer becomes $95,000 × 1.10 = $104,500, so the HUBZone offer is evaluated as lower. If the evaluated prices tie, FAR 19.1307 says the HUBZone small business gets the award.

If you aren't HUBZone-certified, plan on competing purely on price and technical merit for the open portion. Don't price as though you'll get a discount that doesn't exist.

How to Decide Your Bid Strategy: Total vs Partial Set-Aside Checklist

Before you bid, confirm the set-aside type, your size under the assigned NAICS code, and whether your self-performance clears the subcontracting cap. Then decide which portions to price.

Step-by-step on SAM.gov

1. Go to SAM.gov and choose Search, then the Contract Opportunities domain.
2. In Filters, open Set Aside and select Total Small Business Set-Aside (FAR 19.5) and/or Partial Small Business Set-Aside (FAR 19.5). Add your codes under NAICS Code.
3. Open a notice. In General Information, check Contract Opportunity Type: is it a Sources Sought, a Presolicitation, or a Solicitation? In Classification, check the Set Aside and NAICS Code fields.
4. Open the SBA Size Standards Tool, enter that NAICS code, and confirm you're under the receipts or employee limit, counting affiliates.
5. Download the solicitation attachments. For a partial set-aside, find the CLINs marked set aside and not set aside, plus the submission instructions (FAR 19.502-3(b)–(c)).
6. Search the document for "52.219-14" and "52.219-7". Note which clause dates are cited and whether any "(DEVIATION)" labels appear.
7. Build a subcontracting worksheet that lists every planned sub, marks each one similarly situated or not, and shows the dollars paid per period. Confirm you stay under 50%, 85% or 75%.
8. Choose your play using the decision checklist below.

Decision checklist

• Not small under the solicitation's NAICS code? Don't bid on a total set-aside or on the reserved portion. On a partial set-aside you may still bid on the open portion.
• Small, but you'd need subcontractors that aren't similarly situated for more than half the work? Look for a similarly situated teammate, change your staffing, or don't bid on the prime. You could offer to subcontract to another small prime instead.
• Total set-aside, and you can perform at least half yourself? It's usually your strongest field, so prioritize it.
• Partial set-aside, with capacity only for the reserved portion? Price the reserved CLINs carefully, since that's where your competition is limited.
• Partial set-aside, and you can handle both portions? Submit both if the instructions allow it. If your open-portion price isn't competitive, it shouldn't affect your reserved-portion offer, so check whether the solicitation evaluates the portions separately.
• HUBZone-certified? Take a harder look at the open portion, where the 10% evaluation factor may apply.

Common mistakes and fixes

Can a Large Business Bid on a Partial Set-Aside?

Yes, but only on the non-reserved portion. A large business's offer on the reserved portion is treated as nonresponsive and rejected (FAR 19.502-3(d)).

Before rejecting an otherwise eligible offer over a question about the offeror's size, the CO has to get an SBA size determination (FAR 19.502-3(d)). For small bidders, this means a large competitor can win the open CLINs while you win the reserved ones. The government may then manage two contractors on related work.

Example (illustrative): on the 10-CLIN supply buy above, a large manufacturer wins CLINs 0001–0006 and a small distributor wins CLINs 0007–0010. The large firm would have been rejected if it had offered on 0007–0010.

Pitfalls and fixes

• Pitfall (for small firms): assuming large primes will team with you on the reserved portion. Fix: a large firm can only be your subcontractor there, and the dollars you pay it count against your 50% cap.
• Pitfall (for growing firms): your size may change between proposals. Fix: re-check your size for each solicitation, because it's measured on the date of your initial offer with price (13 CFR 121.404).

Next steps

You can do the first three steps today on your own. If you'd like help, there are free options and paid ones.

Do it yourself today:

1. Save a SAM.gov search with Set Aside filtered to SBA and SBP and your two or three main NAICS codes.
2. Run the SBA Size Standards Tool for each of those NAICS codes and write down where you stand against each limit.
3. Make a one-page subcontracting worksheet template with columns for subcontractor, similarly situated (Y/N), dollars per base or option period, and percent of the total. Reuse it on every bid.

If you'd rather not do it alone:

• APEX Accelerators (formerly PTACs) are funded through the DoD Office of Small Business Programs. They offer one-on-one counseling, SAM.gov registration help and bid matching, and most services cost nothing (as of October 2026; check the National APEX Accelerator Alliance). Good fit: first-time bidders who need help with registration and finding opportunities. Not a good fit: firms that need legal advice on a protest or a compliance dispute. Counselors aren't your attorneys, and their availability depends on your local center.
• A government contracts attorney is the right call for size protests, GAO protests or questions about subcontracting compliance. Attorneys usually bill by the hour, and rates vary widely, so get a written estimate first. Not a good fit if you just need help finding bids, because that's expensive for routine work.

Related guide on this site:

• Capability Statement Example: 5 Sections Buyers Read First. Use it when you answer the Sources Sought notices that decide whether a buy is set aside at all.

FAQ

What happens if a small business fails the rule of two after award?

The rule of two is the CO's expectation before the solicitation goes out, so it isn't retested after award. What matters after award is your size as of the date of your initial offer with price, and that generally holds for the life of the contract (13 CFR 121.404). If too few acceptable small business offers come in before award, the CO can withdraw the set-aside and resolicit it (FAR 19.502-2).

Can a set-aside be challenged or protested?

Yes. You can challenge the set-aside decision itself at GAO as a solicitation problem, and you must file before the closing date (4 CFR 21.2(a)(1)). You can also challenge a competitor's size by filing a size protest with the CO within five business days after you're notified of the apparent awardee in a negotiated procurement (13 CFR 121.1004).

Does a partial set-aside count as two separate contracts?

Not necessarily. It's one solicitation with portions that are set aside and portions that aren't, and depending on who wins, it can produce one award or several. FAR 52.219-7 lets offerors submit separate offers for each portion or one combined offer (FAR 52.219-7). The solicitation's instructions decide how the portions are evaluated and awarded.

What size standard applies to determine small business status?

The SBA size standard for the NAICS code the CO assigned to that solicitation applies. Depending on the industry, it's measured by average annual receipts or by number of employees, and it includes affiliates (SBA size standards). You must meet it on the date you submit your initial offer with price (13 CFR 121.404).

Sources

• FAR 19.502-2, Total small business set-asides
• FAR 19.502-3, Partial set-asides
• FAR Subpart 19.5
• FAR 19.506, Withdrawing or modifying small business set-asides
• FAR 19.507, Solicitation provisions and contract clauses
• FAR 19.1307, HUBZone price evaluation preference
• FAR 52.219-4, Notice of Price Evaluation Preference for HUBZone Small Business Concerns
• FAR 52.219-7, Notice of Partial Small Business Set-Aside
• FAR 52.219-14, Limitations on Subcontracting
• FAR 2.101, Definitions
• Acquisition.gov, FAR Overhaul Part 19 deviation text
• NASA RFO Deviation, Part 19
• 13 CFR 125.6, Prime contractor performance requirements
• 13 CFR 121.404, When is size determined
• 13 CFR 121.1004, Size protest time limits
• 4 CFR 21.2, GAO bid protest timeliness
• SBA, Size standards
• GSA, SAM.gov Opportunities API (set-aside codes)
• SAM.gov Contract Opportunities search
• Pillsbury, FAR Council increases acquisition-related thresholds for inflation
• Lohfeld Consulting, FAR Overhaul timeline
• National APEX Accelerator Alliance, Services

Spotted something out of date or wrong? Tell us at shigoto.ai.note@gmail.com. Guides are re-checked against official sources on a rolling schedule.