QSBS Hygiene Checklist: How Founders Keep Section 1202 Eligibility From Formation Through Exit

Many founders first ask whether their shares are qualified small business stock (QSBS) when a buyer or tax preparer asks for proof at exit. By then the deciding facts are fixed: how the shares were issued, the balance sheet at each financing, how assets were used, and whether the company bought back stock at the wrong moment.

This checklist is the operating companion to the summary of the 2025 Section 1202 expansion. It follows the tests in the order a company meets them, under 26 U.S.C. §1202 as amended by Public Law 119-21 (enacted July 4, 2025) and as of October 17, 2026.

1. Identify the Rule Set for Each Share Lot

QSBS is tested lot by lot; one founder can hold pre-enactment common stock, option shares, and preferred stock, each with its own acquisition date. New Section 1202(a)(6)(B) sets that date as the first day the taxpayer held the stock after applying Section 1223, so stock whose holding period tacks to older shares takes the older date.

The tier and cap follow the acquisition date and the gross-asset limit follows the issuance date; the two can diverge for restricted stock without an 83(b) election or stock received in a tax-free exchange. Pending: as of October 17, 2026, the IRS had not published 2027 indexed amounts, and the gross-asset indexing text was misplaced in Section 1202(b) as a second paragraph (4); plan with $15 million and $75 million.

2. Formation: C Corporation Stock at Original Issue

Section 1202(c)(1) requires stock in a C corporation acquired at original issue for money, property other than stock, or services. Three formation facts deserve attention:

• Entity type. Units in an LLC taxed as a partnership and S corporation shares are not QSBS, and Section 1202(c)(2)(A) requires the issuer to be a C corporation during substantially all of the holding period. Founders weighing an S election should first review S corporation versus C corporation for founders raising capital.
• Conversions. When a partnership-taxed LLC incorporates, Section 1202(i) treats the stock as acquired on the exchange date with basis of at least the contributed property's fair market value. Pre-conversion appreciation is outside the exclusion, and contributed property counts at fair market value for the gross-asset test.
• Secondary purchases. Shares bought from a founder or earlier investor are not acquired at original issue, so the buyer does not hold QSBS. Gifts and transfers at death are the main exceptions (Section 1202(h)).

3. The 83(b) Election Sets the Clock

Under Section 83(f), restricted stock's holding period begins only when it vests or becomes transferable, whichever is earlier, unless the founder makes a Section 83(b) election no later than 30 days after the transfer. Because Section 1202(a)(6)(B) ties the acquisition date to the first day the stock is held, a founder without a timely election may have each vesting tranche start its own three-, four-, and five-year clock. No regulation squarely addresses gross-asset testing for tranches vesting after a large financing, so document the position. Review the common founder-stock 83(b) election mistakes before any grant.

Option stock generally starts its holding period at exercise, not grant, so ISO exercise planning and the QSBS clock should be modeled together. Convertible note and SAFE conversions are not settled in guidance; a conservative file treats the conversion date as the issuance date and tests qualification then. 83(b) election support is most useful inside the 30-day window.

4. Every Issuance: Run the Gross-Asset Test

A corporation is a qualified small business for an issuance only if its aggregate gross assets never exceeded the limit before the issuance and do not exceed it immediately after, counting the amounts received in that issuance (Section 1202(d)(1)). Gross assets are cash plus the adjusted tax basis of other property, with contributed property at fair market value (Section 1202(d)(2)). A parent-subsidiary controlled group, using a more-than-50% test, is treated as one corporation (Section 1202(d)(3)).

• Once over, closed to new issuances. Later stock cannot qualify even if cash is spent down, but stock that qualified when issued keeps that status if the other tests continue to be met.
• The higher limit can reopen the door. Under the statute's text, a company that crossed $50 million before July 5, 2025 but never exceeded $75 million may again issue qualifying stock.

Hypothetical example: a company with $30 million of cash and $5 million of basis in other assets that closes a $45 million round has $80 million of gross assets immediately afterward, so neither the new preferred nor any later issuance qualifies. Size the round before signing the term sheet, and keep a dated gross-asset schedule for each closing.

5. Every Year: Keep the Active Business Test Clean

For substantially all of the holding period, at least 80% of the corporation's assets by value must be used in the active conduct of one or more qualified trades or businesses (Section 1202(e)(1)). Section 1202 does not define "substantially all."

Section 1202(e)(3) excludes services in health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage; businesses whose principal asset is employees' reputation or skill; banking, insurance, financing, leasing, and investing; farming; certain extraction; and hotels, motels, and restaurants. A common risk is drift, such as consulting becoming a software company's main revenue line.

• Research counts. Assets used in start-up activities, Section 174 or 174A research, or in-house research for a future qualified business count as active even before the company has related gross income (Section 1202(e)(2)).
• Working capital has a ceiling. Assets held for reasonably required working capital, or expected to fund research or working capital within two years, count as active, but after the company's first two years, no more than 50% of its assets can qualify this way (Section 1202(e)(6)).
• Portfolio and real estate limits. The test fails if more than 10% of the value of assets in excess of liabilities is non-subsidiary stock or securities, or more than 10% of total asset value is real property not used in the business (Section 1202(e)(5)(B) and (e)(7)).

6. Before Any Buyback: Check the Redemption Windows

Section 1202(c)(3) can disqualify stock because of what the company does with other stock:

1. Related-party redemptions. Stock is not QSBS if, during the four-year period beginning two years before its issuance, the corporation purchased stock from the holder or a person related under Section 267(b) or 707(b).
2. Significant redemptions. Stock is disqualified for every holder if, during the two-year period beginning one year before its issuance, the corporation purchased stock worth more than 5% of the value of all its stock at the start of that period.

Treasury Regulation §1.1202-2 disregards purchases unless the amount paid exceeds $10,000 and more than 2% of the relevant stock is acquired. It also disregards repurchases of an employee's or director's service stock incident to a bona fide termination of services, and purchases tied to death, disability, or divorce. Its independent-contractor paragraph is reserved. Review any cofounder buyback or company-funded tender before signing.

7. Before the Exit: Tier, Cap, Hedges, and Reporting

No post-enactment lot can reach even the three-year tier before July 2028. For that stock, the per-issuer cap is the greater of $15 million, reduced by the issuer's eligible gain taken into account in earlier years and by current-year gain on its pre-enactment stock, or 10 times the adjusted basis of the issuer's QSBS sold during the year (Section 1202(b)). Under Section 1(h)(4) and (h)(7), the nonexcluded portion of eligible gain at the 50% and 75% tiers is taxed at a maximum 28% rate. Under Section 1202(j), a short sale or a put option on substantially identical stock denies the exclusion unless the stock had met the minimum holding period when the position began and the holder elects to recognize gain as of that day. The sale is reported on Form 8949 with code Q; the 2025 Schedule D instructions do not yet address the post-enactment tiers.

8. Test State Conformity Separately

California does not conform to the Section 1045 deferral or the Section 1202 exclusion; the 2025 California Schedule D (540) instructions direct taxpayers to report the entire gain. Other states may decouple, so confirm residence on the sale date and review residency rules before any pre-exit move.

9. Build the QSBS File

The corporation must also agree to submit any reports the Treasury requires (Section 1202(d)(1)(C)). Section 1202 regulations are item 32 on the 2026-2027 Priority Guidance Plan released September 29, 2026, but no proposed or final regulations under the 2025 changes had been published as of October 17, 2026. Until then, startup CPA support can keep this file current with the cap table.

Common Mistakes

• Calling partnership-taxed LLC units or S corporation shares QSBS. Only C corporation stock qualifies, and pre-conversion appreciation is not excludable.
• Missing the 83(b) election or its proof. Without a timely election, each vesting tranche may carry its own clock.
• Measuring gross assets by valuation. The test uses cash and tax basis, including the round's own cash.
• Drifting into an excluded field. Consulting, financial services, or financing activity can grow until the 80% test fails.
• Buying back a departing cofounder's shares unreviewed. The termination exception covers only stock received as an employee or director.
• Closing just before a tier anniversary. A few weeks can move a quarter or more of the eligible gain from excluded to taxable.

The Bottom Line

Section 1202 rewards founders who treat QSBS as a recurring compliance process rather than an exit-day question. Confirm C corporation status at formation, preserve the 83(b) election, compute gross assets at every issuance, review the business mix yearly, clear every buyback against the redemption windows, and map each lot's tier and cap before setting a closing date. Under the 2025 law, waiting from the fourth anniversary to the fifth can shift a quarter of the eligible gain; an undocumented file can cost all of it.

This article provides general educational information about federal Section 1202 and related rules as of October 17, 2026. It is not tax or legal advice; whether any stock qualifies depends on company records, shareholder facts, and state law that require individual review.