Small Business Set-Asides in Federal Contracting: A Certification Study Guide

Small Business Set-Asides Are Mandatory Considerations — Not Optional Preferences

Federal contracting officers frequently mischaracterize small business set-asides as a good-faith gesture toward policy goals. They're not. Under the Small Business Act and FAR Part 19, contracting officers at civilian agencies have mandatory duties to evaluate every acquisition for set-aside potential — and failing to meet those duties has real legal and administrative consequences. If you're preparing for FAC-C certification through DAU, mastering small business set-aside rules is not optional. It's one of the most consistently tested areas across all three FAC-C levels.

The Federal Small Business Goal Structure

Congress sets government-wide small business procurement goals annually. As of 2026, the government-wide targets are:

• 23% of prime contract dollars to small businesses
• 5% to small disadvantaged businesses (SDBs), including 8(a) participants
• 5% to women-owned small businesses (WOSBs)
• 3% to HUBZone small businesses
• 3% to service-disabled veteran-owned small businesses (SDVOSBs)

These are goals, not hard minimums — agencies don't face automatic penalties for missing them. But agency-level performance against these goals affects agency leadership evaluations, Congressional scrutiny, and SBA program ratings. Contracting officers are expected to know their agency's goals and actively support meeting them.

When Is a Set-Aside Required vs. Optional?

FAR 19.502-2 establishes the "Rule of Two": if there is a reasonable expectation that at least two responsible small businesses will submit offers at a fair market price, the contracting officer shall set aside the acquisition for small businesses exclusively. This is mandatory — not discretionary. If the Rule of Two is satisfied, the contracting officer cannot proceed with an unrestricted competition without documenting why the set-aside is not in the government's best interest.

For acquisitions under the simplified acquisition threshold ($250,000), FAR 13.003(b)(1) creates an additional mandatory consideration: acquisitions between $3,000 and $150,000 must be reserved for small businesses unless the contracting officer can document that adequate small business competition is not available. This is sometimes called the "mandatory set-aside range."

Types of Small Business Set-Asides

The FAC-C exam tests knowledge of each set-aside type, its eligibility criteria, and its ordering rules:

• Small Business (SB) Set-Aside: Any business meeting SBA size standards for the relevant NAICS code. The broadest set-aside category. Size standards vary by industry — some are based on number of employees (e.g., 500 employees for manufacturing), others on average annual revenue (e.g., $8 million for certain service industries).
• 8(a) Business Development Set-Aside: Available to socially and economically disadvantaged small businesses certified by the SBA under the 8(a) program. 8(a) awards can be made sole-source (without competition) up to $4.5 million for services and $7.5 million for manufacturing. Above those thresholds, competition among 8(a) firms is required.
• HUBZone Set-Aside: Available to firms in Historically Underutilized Business Zones — designated geographic areas with low income or high unemployment. HUBZone firms must have at least 35% of employees residing in a HUBZone and maintain their principal office there.
• SDVOSB Set-Aside: Available to small businesses at least 51% owned and controlled by service-disabled veterans. For VA acquisitions, the Veterans Benefits, Health Care, and Information Technology Act ("Veterans First" contracting program) creates additional set-aside preferences beyond what applies to civilian agencies.
• WOSB Set-Aside: Available to small businesses at least 51% owned and controlled by women, in industries where women are underrepresented or substantially underrepresented as defined by SBA. There's also an Economically Disadvantaged WOSB (EDWOSB) subcategory for economically disadvantaged women.

How to Determine Size Standard Eligibility

Size standards are set by the SBA based on the NAICS code assigned to the acquisition. Every federal acquisition must be assigned a primary NAICS code by the contracting officer — a determination that directly affects which businesses are small for that acquisition. Assigning the wrong NAICS code (one that makes a large business appear small, or that excludes otherwise eligible small businesses) is a compliance issue with real consequences.

Contracting officers access the SBA's Table of Small Business Size Standards, which lists the employee or revenue threshold for each NAICS code. When the NAICS code is correctly identified, the contracting officer must determine whether adequate small business competition exists at that size standard before proceeding with an unrestricted acquisition.

Set-Asides on GSA Schedule Orders

FAC-C candidates studying GSA contracting specifically need to understand that set-aside requirements apply to Schedule orders. FAR 8.405-5 allows — and in many cases requires — contracting officers to set aside Schedule orders for small businesses, 8(a) firms, SDVOSBs, HUBZone firms, and WOSBs when adequate competition exists among Schedule holders meeting the relevant program criteria.

GSA maintains subsets of Schedule holders by socioeconomic category. On GSA Advantage! and e-Buy, contracting officers can filter vendors by small business category to identify eligible contractors for a set-aside order. The same Rule of Two analysis applies — if two or more qualifying vendors are available on the Schedule at a fair market price, the order should be set aside.

Subcontracting Goals and Large Business Requirements

When a large business receives a prime contract above $750,000 (or $1.5 million for construction), FAR 19.702 requires the large business to establish a small business subcontracting plan with goals for subcontracting to small, SDB, WOSB, SDVOSB, HUBZone, and veteran-owned small businesses. Contracting officers must review and approve the subcontracting plan as part of contract award. Failing to meet subcontracting goals can result in liquidated damages under the contract.

Small Business Programs Are Heavily Tested for a Reason

Small business set-aside rules generate more compliance issues, protests, and audit findings than almost any other contracting area. The Government Accountability Office (GAO) consistently sustains protests from small businesses that were improperly excluded from set-aside acquisitions or where set-asides were improperly circumvented. Knowing these rules cold protects both the government and the contracting officer.

SimpuTech's GSA Contracting AI tutor drills set-aside scenarios, size standard determinations, Rule of Two applications, and Schedule set-aside procedures — the exact topics that separate passing FAC-C candidates from those who retake the coursework. Start practicing free at SimpuTech →

Related reading: How to Pass the FAC-C Certification and GSA Schedule Contracts Explained.

Certification details verified against dau.edu and FAR Part 19 as of March 2026. Requirements are subject to change — confirm current details before registering.