QSBS 2026: Complete Guide to Tax-Free Small Business Stock Sales

Your client just signed a letter of intent to sell her C corp for $18 million. She acquired the stock four years ago. Whether she walks away with a seven-figure tax bill or close to zero depends almost entirely on whether her shares qualify as Qualified Small Business Stock under IRC Section 1202 — and whether she held long enough. That gap is worth understanding before the wire clears.

What Changed on July 4, 2025

For stock issued and acquired after July 4, 2025, two thresholds increased significantly:

• Gross-assets cap: The issuing C corporation can now have up to $75 million in gross assets at the time of issuance, up from the prior $50 million ceiling. This expansion brings a larger universe of growth-stage companies within reach.
• Exclusion cap: The federal gain exclusion rises to the greater of $15 million or 10 times the taxpayer’s adjusted basis in the stock. Stock acquired on or before July 4, 2025 stays under the older $10 million / 10× basis ceiling.

For stock acquired after July 4, 2025, the exclusion also phases in on a graduated schedule: 50% after three years, 75% after four years, and 100% after five. Older QSBS generally requires the full five-year hold for the complete exclusion.

These are the numbers that govern 2026 planning. When you’re reviewing a cap table or modeling an exit, the acquisition date relative to July 4, 2025 is the first question to resolve.

Core Qualification Checklist

Section 1202 imposes requirements on both the issuing corporation and the shareholder. Miss one box and the exclusion disappears.

The corporation must:

• Be organized as a domestic C corporation. S corps, partnerships, and LLCs do not qualify. For clients who formed an LLC or S corp expecting future appreciation, a conversion to C corp — and a clean stock issuance — may be worth modeling early.
• Have gross assets at or below $75 million (for issuances after July 4, 2025) immediately before and after the stock issuance. This is a cumulative, all-in test. Prior rounds count.
• Use at least 80% of its assets in the active conduct of one or more qualified trades or businesses. Passive investment holding, real estate, banking, insurance, leasing, and most professional services are excluded.

The shareholder must:

• Acquire stock directly from the corporation — original issuance or certain reorganizations only. Secondary-market purchases don’t qualify.
• Receive stock in exchange for money, property (other than stock), or services.
• Hold the shares for the required period: five years for pre-July 4, 2025 acquisitions; three years for partial exclusions and five for the full exclusion on post-July 4, 2025 stock.

Documentation discipline matters here. Keep the stock purchase agreement, board minutes approving the issuance, the gross-assets certificate at issuance date, and any periodic 409A valuations. These become exhibits when you file Form 8949 and attach a statement to the return.

Calculating the Tax Savings

For a shareholder who paid $500,000 for stock acquired after July 4, 2025 and held for five or more years, the exclusion cap is the greater of $15 million or 10 × $500,000 = $5 million. The $15 million cap governs. A gain of $14.8 million on a sale? Entirely excluded at the federal level.

The exclusion also eliminates exposure to the 3.8% net investment income tax and, for eligible gains, the alternative minimum tax — which used to trap taxpayers under older QSBS rules.

Shareholders with multiple exits can stack exclusions by holding shares across separate C corporations, each independently qualifying. The $15 million cap applies per taxpayer per issuing corporation, not per year.

The Section 1045 Rollover Option

A client who sold QSBS after holding it for more than six months but less than five years isn’t necessarily stuck with full capital-gains exposure. Section 1045 allows the gain to roll over into new QSBS within 60 days of the sale. The replacement stock inherits the holding period from the original shares for purposes of the five-year clock.

This is the mechanism sophisticated founders use when a strategic acquirer moves faster than the five-year window. It requires strict compliance — 60 days is absolute — and the replacement stock must itself qualify under Section 1202. Get the advisory in place before closing, not after. IRS

State Conformity: The Gap Most Plans Miss

Federal exclusion is clean, but several states do not conform to Section 1202 at all. California, Pennsylvania, Alabama, Mississippi, and Oregon offer zero state-level QSBS exclusion. A California resident excluding $15 million federally still owes California capital gains on the full amount — potentially over $1.3 million at current rates.

For clients in non-conforming states, the residency question should surface early in exit planning. Changing domicile before a liquidity event is a real strategy, but it requires genuine relocation well before closing and carries its own scrutiny.

Practical Planning Steps for CPAs

1. Audit the cap table now, not at LOI. Confirm the corporation’s gross assets at each round of issuance. If a prior round pushed the company past $75 million, newer shares may not qualify even if older ones do.
2. Confirm the active business test. Review the company’s balance sheet for passive assets. Excess cash sitting in Treasury bills counts toward the 80% calculation if it isn’t earmarked for near-term operating use.
3. Track acquisition dates precisely. The July 4, 2025 dividing line changes both the cap and the phase-in schedule. A cap table with shares acquired across multiple tranches will have mixed exclusion treatment.
4. Model state tax separately. Run a state-by-state analysis for any client in a non-conforming jurisdiction.
5. Document everything at issuance, not retrospectively. Courts and the IRS have denied exclusions when contemporaneous records were missing.

How Sagenext Helps

CPAs managing QSBS planning for multiple clients often run into a practical bottleneck: the analysis lives across UltraTax, Lacerte, or ProSeries, and the supporting workpapers sit in spreadsheets that don’t travel well when the team is split between office and remote locations.

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Key Takeaways

• Stock acquired after July 4, 2025 qualifies for a $15 million federal exclusion cap (up from $10 million) and is subject to a gross-assets test of $75 million at issuance.
• The exclusion phases in at 50% / 75% / 100% at years 3, 4, and 5 for post-July 4, 2025 acquisitions.
• Full federal exclusion also eliminates the 3.8% net investment income tax and, for eligible gains, AMT exposure.
• California, Pennsylvania, Alabama, Mississippi, and Oregon provide no state-level QSBS exclusion — model state tax separately.
• Section 1045 allows a 60-day rollover into new QSBS when the five-year hold hasn’t been met, preserving partial exclusion eligibility.
• Documentation at the time of issuance — not reconstructed at exit — is what survives an audit.

Frequently Asked Questions

Does an S corporation qualify for QSBS treatment?

No. QSBS must be issued by a domestic C corporation. S corps, LLCs, and partnerships are ineligible. If a client currently operates as an S corp or LLC and is planning a multi-year hold before exit, converting to a C corp and issuing qualifying stock at that point starts a fresh five-year clock — but the conversion itself doesn’t retroactively qualify prior ownership interests.

What is the gross-assets limit for QSBS issued in 2026?

For stock issued after July 4, 2025, the issuing C corporation’s gross assets must not exceed $75 million immediately before and after the issuance. Prior rounds of stock and accumulated assets count toward that ceiling. Stock issued before that date is subject to the older $50 million threshold.

Can the QSBS exclusion be claimed on gains above $15 million?

The exclusion is capped at the greater of $15 million or 10 times the taxpayer’s adjusted basis for post-July 4, 2025 acquisitions. Gains above that cap are taxable. However, each separate qualifying C corporation generates its own exclusion limit per taxpayer, so founders with equity in multiple qualifying companies can stack exclusions across different issuers. Charitable Tax Deductions Post Filing Recovery Guide

What happens if a client sells QSBS before the five-year holding period?

For older QSBS, an early sale is generally fully taxable unless Section 1045 applies. For stock acquired after July 4, 2025, partial exclusions begin at three years (50%) and four years (75%). The Section 1045 rollover into new qualifying stock within 60 days of sale is available for shares held more than six months but fewer than five years, preserving the gain deferral.

Which states don’t honor the federal QSBS exclusion?

California, Pennsylvania, Alabama, Mississippi, and Oregon do not conform to the federal Section 1202 exclusion. Residents of those states owe state capital gains tax on the full gain even when the federal exclusion applies. Pre-sale residency planning is a legitimate strategy but requires genuine domicile change well in advance of closing — not a last-minute address swap.