QSBS Active Business Requirement: The 80% Asset Test

The QSBS active business requirement says that a corporation must use at least 80% of its assets, measured by value, in the active conduct of one or more qualified trades or businesses, and it has to keep doing so for substantially all of the time a shareholder holds the stock.¹ It is the ongoing test that decides whether qualified small business stock keeps its status from issuance through sale. Meeting it is what lets a shareholder claim the Section 1202 gain exclusion, which can shelter up to 100% of the profit on qualifying stock from federal income tax.

The requirement has two moving parts: a quantitative asset test, and a qualitative test about what kind of business the company is in. Both have to be satisfied at the same time, and both have carve-outs and traps that catch companies off guard.

The 80% Asset Test

At least 80% of the corporation’s assets, by value, must be used in the active conduct of a qualified trade or business.¹ Assets sitting in investment accounts, speculative holdings unrelated to operations, or property not actually deployed in the business fall outside that 80% and drag the ratio down.

“By value” here means fair market value, not adjusted tax basis. That matters. A company with heavily appreciated operating assets gets counted at current value, which helps the ratio. A company that just closed a large financing round has a pile of cash that has not yet been put to work, and cash sitting idle is where most 80% problems start.

What Counts as a Qualified Trade or Business

The asset test only works if the underlying business is a qualified one to begin with. Section 1202 defines qualified trades or businesses by exclusion: anything not on the excluded list is fine.

The broadest excluded category covers professional services where the principal asset is the reputation or skill of one or more employees. Health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage services are all on that list.² A small consulting firm whose clients hire it because of who the partners are is in excluded territory no matter how fast it grows.

Several other sectors are categorically barred:

Banking, insurance, financing, leasing, investing, and similar financial activities.²
Farming, including raising or harvesting trees.
Businesses that produce or extract products eligible for the percentage depletion deduction, such as oil, gas, and mining operations.
Hotels, motels, restaurants, and similar hospitality businesses.

Technology companies, manufacturers, and e-commerce businesses typically pass without difficulty. The hard cases involve mixed activities, like a software company that also runs a substantial consulting practice. When a company straddles the line, the question is whether the excluded activity is a separate trade or business or merely incidental to the qualifying one.

Where Software and SaaS Companies Land

Software and SaaS companies are not named in the exclusion list, and most qualify as long as revenue comes from a product rather than from individualized professional advice. A company that builds software, licenses it, and supports it with standard customer service is selling a product. A company that deploys consultants to solve unique client problems using proprietary tools looks more like a consulting firm. The statute draws the line at businesses whose “principal asset” is employee reputation or skill, so the analysis turns on what the company is actually selling.² No IRS guidance or published ruling draws a bright line here, so companies near the boundary need to structure and document their operations carefully.

Cash, Working Capital, and the Two-Year Ceiling

Cash is the most common threat to the 80% threshold, particularly right after a fundraise. Section 1202(e)(6) provides relief: assets held as reasonably required working capital, or held for investment but reasonably expected to be used within two years to finance research or increase working capital, are treated as active business assets.² A startup that raises $20 million and plans to spend it over the next 18 months on product development can count that cash toward the 80%.

The relief has a hard ceiling. Once the corporation has existed for at least two years, no more than 50% of its total assets can qualify as active business assets solely because they are working capital or earmarked investment funds.² A five-year-old company sitting on a war chest equal to 60% of its total asset value, with no concrete deployment plan, cannot lean on the working capital exception to satisfy the test. This rule prevents companies from operating as tax-advantaged savings accounts while nominally running a small business.

The companies that stumble here are the ones that raise capital well ahead of need, accumulate profits without reinvesting, or hold large reserves “just in case.” A concrete spending plan tied to the business makes the working capital argument far stronger than vaguely earmarking funds for future use.

Startup and Research-Stage Companies

Pre-revenue startups have an obvious tension with the requirement: they may not have a product yet, let alone assets deployed in active operations. The statute addresses this directly. Assets used in startup activities, and expenditures that qualify as research and experimental costs, count toward the active conduct of a qualified trade or business.¹ A company spending its seed round on engineering prototypes, developing software, or running clinical trials is engaged in active business conduct even without customers.

The startup-phase rule pairs with the working capital exception. A newly formed company that raised $5 million and is spending it on R&D can count both the research expenditures and the not-yet-spent cash (under the two-year deployment expectation) as active business assets. Together these give early-stage companies real breathing room. The key is documentation. Board minutes should record what the research is targeting, technical progress reports should show that work is actually happening, and financial records should tie expenditures to specific development milestones. Vague descriptions of “exploring opportunities” will not hold up if the IRS asks questions.

Real Estate and Portfolio Stock Sub-Limits

Two additional asset-level restrictions operate alongside the 80% test and can independently disqualify a corporation.

Real estate not used in the active conduct of the business cannot exceed 10% of total corporate asset value during the shareholder’s holding period.³ A tech company that owns its office building is fine, because that real estate is used in operations. A tech company that also buys rental properties as a side investment is accumulating non-qualifying real estate against the 10% ceiling.

Stock or securities in other corporations cannot exceed 10% of net asset value (assets minus liabilities).² This prevents a company from parking excess capital in public equities while claiming to be an active small business. Minority investments in unrelated companies count directly against the 10% cap.

Subsidiaries and the Look-Through Rule

Holding company structures do not automatically fail the portfolio stock limitation. When a parent corporation owns more than 50% of a subsidiary by voting power or by value, the parent ignores the subsidiary’s stock on its balance sheet and instead treats a proportional share of the subsidiary’s assets as its own.² The parent is also deemed to conduct its proportional share of the subsidiary’s business activities.

The subsidiary’s assets get folded into the parent’s 80% test. If the subsidiary runs an excluded business, that activity flows up too and can taint the entire structure. Companies operating through multiple subsidiaries need to run the look-through analysis at every level.

How Long the Requirement Has to Be Satisfied

This is not a snapshot taken on the day stock is issued. The corporation must satisfy the active business requirement during “substantially all” of the taxpayer’s holding period.⁴ Section 1202 does not define “substantially all” with a fixed percentage. The term appears throughout the tax code and practitioners generally read it as somewhere in the 80% to 95% range. A brief, inadvertent dip below the 80% asset threshold that gets corrected quickly is survivable. A company that pivots into an excluded industry for a year probably is not.

Because the requirement runs across the entire holding period, a company that loses qualifying status partway through cannot restart the clock. Once the substantially-all threshold is breached, the stock may lose QSBS status permanently, and there is no statutory mechanism to restore it. Shareholders who hold for the years needed to capture the full exclusion are exposed to corporate decisions throughout that window.

Documenting Compliance

The IRS rarely concedes a QSBS exclusion claim without documentation, and the burden falls on the taxpayer. Maintaining records that prove active business compliance over a multi-year holding period takes planning from day one.

For the 80% asset test, the company should keep periodic balance sheets that categorize each asset as either active-business or non-qualifying, with fair market value estimates for the active business measurement. Formal appraisals every quarter are not necessary, but the company should be able to reconstruct its asset mix for any point in the holding period if asked.

For the working capital exception, keep records showing how cash was allocated: board-approved spending plans, burn-rate projections, and documentation linking cash reserves to specific operational needs. After the two-year mark, when the 50% working capital cap kicks in, those records become especially important.

For startup and research activities, board minutes should describe the nature of R&D projects and their connection to a future qualifying business. Technical progress reports, patent filings, and contracts with research partners all serve as corroborating evidence. The goal is to show that expenditures reflected genuine development activity, not speculative holding.

Many investors ask the company for a QSBS compliance certificate at the time they purchase stock and again at sale. These are formal representations by company officers confirming that the corporation meets the C corporation requirement, sits within the gross assets limit, and satisfies the active business requirement. They are not binding on the IRS, but they create a contemporaneous record and shift factual accountability to company leadership.

1
Office of the Law Revision Counsel. 26 USC 1202 Partial Exclusion for Gain From Certain Small Business Stock
2
Office of the Law Revision Counsel. 26 US Code 1202 – Partial Exclusion for Gain From Certain Small Business Stock
3
U.S. Department of the Treasury. Quantifying the 100% Exclusion of Capital Gains on Small Business Stock
4
Internal Revenue Service. Private Letter Ruling 202418001