Qualified small business stock (QSBS) can allow an eligible shareholder to exclude part or all of a qualifying stock-sale gain under Section 1202. The result depends on the stock, company, shareholder, and dates. Forming a C corporation or holding shares for several years does not establish eligibility by itself.

Philip M. Falco, Attorney & CPA helps founders, investors, and business owners coordinate entity structure, stock records, tax analysis, and a proposed exit. Start the review before issuing equity or agreeing to sell. This guide is part of our business tax practice.

Which Stock Can Qualify Under Section 1202?

The exclusion is available to eligible taxpayers other than corporations. Generally, the taxpayer must acquire stock at original issuance from a qualifying domestic C corporation, for money, qualifying property, or services. Buying another shareholder’s existing shares ordinarily does not meet the original-issue requirement. Certain gifts, transfers at death, reorganizations, and pass-through holdings have specific rules.

The company must satisfy the applicable gross-assets test when the stock is issued, including the proceeds of that issuance. During substantially all of the holding period, it must remain a C corporation and meet the active-business requirements. Generally, at least 80% of the value of its assets must be used in qualified active businesses, subject to statutory rules for startup activities, research, working capital, and other assets.

Several businesses are excluded, including specified professional services, financial and investment businesses, farming, and hotels and restaurants. A business’s marketing label does not settle the question. Review actual activities, revenue, assets, subsidiaries, and changes over time. Corporate redemptions can also disqualify an issuance. See IRC §1202.

Stock Dates Determine Holding Periods and Exclusion Limits

The 2025 legislation changed important rules. Keep the acquisition date, original issuance date, holding-period history, and sale year separate; they do not always answer the same question.

Stock acquired after September 27, 2010, and on or before July 4, 2025: qualifying stock generally requires a holding period of more than five years for the 100% exclusion. Earlier stock can have different exclusion percentages and tax consequences.
Stock acquired after July 4, 2025: the amended rules provide a 50% exclusion after at least three years, 75% after four years, and 100% after five years, subject to the other requirements and effective-date rules.
Per-issuer limits: eligible gain is generally limited to the greater of the applicable remaining dollar limit or ten times qualifying stock basis. The dollar-limit framework distinguishes $10 million for older acquisitions and $15 million for acquisitions after July 4, 2025, with coordination for prior and current exclusions from the same issuer. These are not independent allowances that can simply be added together.
Company size at issuance: the gross-assets ceiling increased from $50 million to $75 million for stock issued after July 4, 2025. This is a tax gross-assets test, not simply the company’s headline valuation.

The amended $15 million and $75 million amounts are subject to inflation adjustments for taxable years beginning after 2026. Married filing separately, transferred stock, and holding-period tacking require additional analysis. Confirm the applicable version of Section 1202 and its effective-date provisions for each lot. A partial exclusion can leave taxable gain subject to rules different from ordinary long-term capital gains.

Plan Before Formation, Financing, and Sale

Compare the possible shareholder exclusion with C-corporation tax costs, expected distributions, financing needs, and the likely buyer’s preferred transaction. A corporation’s asset sale does not become tax-free merely because its shareholders own QSBS. A later distribution or liquidation requires its own analysis. See purchase and sale of businesses.

For a new company, coordinate startup formation, documented stock issuance, valuation, and restricted founder stock and Section 83(b). An 83(b) election does not certify QSBS status. An option, convertible note, or SAFE also requires analysis of when stock is actually acquired and how the instrument is treated; the funding date is not automatically the QSBS acquisition date.

An LLC conversion or S-to-C change does not automatically preserve an earlier QSBS holding period. Review the transaction before implementing it. For family-owned investments, family office tax planning can help coordinate ownership records and management arrangements, but a family-office structure does not establish QSBS eligibility or create extra exclusions by itself.

Section 1045: Reinvesting Proceeds From an Early QSBS Sale

Section 1045 may defer eligible gain when a noncorporate taxpayer sells QSBS held for more than six months, buys replacement QSBS within the 60-day period beginning on the sale date, and makes the required election. It is a separate rollover provision, not the Section 1202 exclusion and not the IRS form bearing the same number.

The calculation compares the amount realized with qualifying replacement-stock cost. Reinvesting only the profit may leave recognized gain. Deferred gain reduces replacement basis, and special holding-period and active-business rules apply. Confirm replacement eligibility and election requirements before relying on the rollover.

Illustration: assume a qualifying sale produces $500,000 of proceeds and $400,000 of gain. If qualifying replacement stock costs $450,000, the simplified calculation leaves $50,000 of recognized gain and defers $350,000. Replacement basis is reduced accordingly. This assumes all eligibility, timing, election, and other requirements are satisfied and ignores selling costs and other adjustments.

Section 1045 does not allow an investor to sell ordinary public-company shares or rental real estate and defer that gain merely by funding a startup. Identify the asset being sold before selecting a strategy.

ROBS and QSBS: Identify Who Owns the Shares

In a ROBS business-funding arrangement, the qualified retirement plan purchases employer stock. Those shares are not personally owned by the participant. A plan’s stock sale and a participant’s later retirement distribution are different tax events; do not assume Section 1202 makes a retirement distribution tax-free.

A founder who separately acquires original-issue shares outside the plan needs a separate QSBS analysis for those shares. Valuation, allocation of ownership, plan fiduciary obligations, and prohibited-transaction issues must also be addressed. Sharing a C-corporation structure does not automatically combine the benefits of the two provisions.

Records to Bring to a QSBS Review

Formation documents, tax elections, capitalization tables, stock ledger, and issuance agreements.
Purchase or service consideration, transfer dates, vesting terms, and any 83(b) election.
Financial statements and asset calculations before and immediately after each issuance.
Business-activity history, subsidiaries, redemptions, reorganizations, gifts, and trust or pass-through ownership.
Proposed sale documents, prior exclusions from the issuer, and any replacement investment for Section 1045.

Coordinate the analysis with individual tax preparation and the broader tax strategy review. State conformity, residence, and sourcing require separate review; a federal result is not a promise of identical state treatment.

QSBS Planning FAQs

Does every C corporation issue QSBS?

No. Issuance, gross assets, business activities, shareholder eligibility, redemptions, and holding periods all matter.

Can I exclude an unrelated gain by investing the proceeds in QSBS?

Section 1202 addresses gain on qualifying stock itself. Section 1045 requires a qualifying QSBS sale; neither is a general shelter for unrelated capital gains.

Can a stock certificate or company letter prove eligibility?

It can support the file, but it does not replace analysis of the underlying facts and statutory requirements.

Should I wait until a buyer makes an offer?

Some choices must be made at issuance, and records can become harder to reconstruct later. Review early and update the analysis before a transaction.

Discuss Your Tax Planning With an Attorney & CPA

Schedule a $500 Tax Attorney Consultation. The fee includes up to one hour of total attorney time for review, analysis, preparation, and the telephone consultation combined. Formation, document drafting, transaction implementation, plan administration, tax returns, and ongoing advice require a separate written engagement.

Federal authorities checked September 28, 2026. This guide provides general information; the applicable law and tax result depend on the transaction, tax year, and taxpayer’s facts.