DailyDime

The tax code can erase up to $15 million of federal gain on one company’s stock, but only if the shares, business, holding period, and exit all line up.

Everyone’s favorite topic, taxes!

If you’re a founder or small business owner, your accountant has probably mentioned QSBS. I know mine has. It’s a great tax break for owners and investors, but you have to make sure to follow the rules exactly or you may end up losing out on the benefits.

Specifically, section 1202 is unusually generous and unusually unforgiving. Under the 2026 section 1202 QSBS rules, a qualifying noncorporate shareholder can exclude millions of dollars of gain from federal income tax.

The headline cap is generally $10 million for older shares and $15 million for shares acquired after July 4, 2025. The alternative limit is 10 times basis, which can matter even more to investors. Miss one requirement, though, and the exclusion can disappear.

This guide explains the rules, the tax math, and the deal-structure traps that matter before a buyer sends an LOI. For the broader entity comparison, start with DailyDime’s LLC vs. C-corp exit analysis.

What Section 1202 Actually Does

Section 1202 lets a taxpayer other than a corporation exclude eligible gain from selling or exchanging qualified small business stock, or QSBS. With a 100% exclusion, the excluded amount produces no regular federal capital gains tax and generally no 3.8% net investment income tax.

The cap applies per taxpayer, per issuer. It is generally the greater of the applicable dollar limit or 10 times the adjusted basis of qualifying shares from that issuer sold during the year. A low-basis founder usually focuses on the dollar limit. An investor who wrote a large early check may care more about 10 times basis.

This is why entity choice can become an exit decision years before an exit exists. A C-corp creates the possibility of QSBS. An LLC interest or S-corp share does not.

How the Section 1202 QSBS Rules Changed in 2025

The 2025 tax law created a second QSBS regime for stock acquired after July 4, 2025. Those shares can receive a 50% exclusion after three years, 75% after four years, and 100% after five years.

The same law raised the dollar cap to $15 million and the gross-assets ceiling to $75 million for new stock. Both amounts begin receiving inflation adjustments for tax years after 2026. The calendar now matters almost as much as the cap table.

Older shares need one more caveat. Stock acquired before February 17, 2009 generally gets a 50% exclusion, while stock acquired from February 17, 2009 through September 27, 2010 generally gets 75%. Most current founder and angel stock falls into the later 100% regime.

The unexcluded part of a three-year or four-year gain can face a maximum 28% federal capital gains rate, not the usual 15% or 20%. NIIT may also apply. The IRS investment-income guide explains the 28% bucket and the older issuance rules.

What Has to Be True for Stock to Qualify

QSBS is a checklist statute. The shares and the company must satisfy the rules, and several tests continue during your holding period. Tax law loves a checklist, and Section 1202 brought the whole clipboard.

The company must be a domestic C corporation

LLC units and S-corp shares are not QSBS. Converting to a C-corp can start a new clock for stock issued in the conversion, but it does not turn the old ownership period into a QSBS holding period.

You generally must receive original-issue stock

You normally must acquire the shares directly from the company for cash, eligible property, or services. A secondary-market purchase usually fails. Certain gifts, inheritances, conversions, and reorganizations can preserve the original holder’s treatment, but those are exceptions that need documentation.

Options, SAFEs, and convertible notes are not stock. The QSBS clock generally starts when the company actually issues shares after exercise or conversion. That timing matters for employees receiving startup equity.

The company must pass the gross-assets test

The test applies immediately before and immediately after the issuance. For older stock, aggregate gross assets generally could not exceed $50 million. The ceiling rises to $75 million for stock issued after July 4, 2025.

Cash counts at face value, while most other assets count at tax basis. Property contributed to the corporation has special fair-market-value rules. Growth after issuance does not automatically disqualify shares that already qualified, but later issuances may fail.

The business must stay active and qualified

During substantially all of your holding period, the corporation generally must use at least 80% of its assets by value in one or more qualified active businesses. Working capital, research assets, and startup costs can count under special limits.

Excluded fields include health, law, engineering, architecture, accounting, actuarial science, performing arts, consulting, athletics, financial services, and brokerage. Banking, insurance, financing, leasing, investing, farming, certain extraction businesses, hotels, motels, restaurants, and similar businesses are also excluded.

Software, manufacturing, and consumer-product companies may qualify, but labels do not decide the answer. The actual activities and assets do. The IRS will not accept ‘we were a startup’ as an asset test.

Redemptions and excess passive assets can spoil the result

Company repurchases around an issuance can disqualify stock under specific windows and thresholds. Too much idle cash, portfolio stock, or real estate can also threaten the active-business test.

Keep a QSBS file while the evidence still exists. It should include the cap table, stock purchase documents, board approvals, asset-test calculations, financial statements, tax returns, and support for the company’s qualifying activities.

The Detail Most QSBS Explainers Miss

A direct stock sale is the cleanest QSBS exit, but an asset deal does not always destroy the shareholder exclusion. It does guarantee that the C-corp pays tax on its asset gain.

If the corporation then completes a qualifying liquidation, Section 331 treats the liquidating distribution as payment in exchange for the shareholder’s stock. Because Section 1202 applies to gain from a sale or exchange of QSBS, the shareholder-level liquidation gain may qualify for exclusion.

That does not make the asset sale tax-free. The corporation still owes 21% federal tax on its gain. But QSBS may remove the second shareholder-level tax that normally makes a C-corp asset sale so painful.

The plan of liquidation, timing, liabilities, distributions, and shareholder facts all matter. This is transaction-counsel territory, not a box to check after closing. DailyDime’s asset purchase vs. equity purchase guide covers why buyers still push for assets.

That is the kind of detail that can move seven figures while everyone is still arguing about the multiple.

The Federal Tax Math on a $10 Million Gain

Assume a high-income owner, nearly zero basis, federal tax only, and gain that is entirely long-term capital in character. Real asset deals often include ordinary-income recapture, inventory, and receivables, which can make the pass-through result worse. NIIT is also fact-specific. The 3.8% tax may not apply to gain tied to an active business in which the owner materially participates. It commonly applies to passive investors and stock-sale gain. The IRS NIIT guide explains the basic thresholds and exclusions.

The table is a clean comparison, not a tax return. Purchase-price allocations can create ordinary income. Existing stock basis, corporate basis, transaction costs, state tax, and NIIT status can all change the result.

The practical point is simple: model both the entity and the exit structure. DailyDime’s strategic sale vs. recapitalization guide explains why the highest headline valuation is not always the best after-tax deal.

The $10 Million or $15 Million Cap Is Not Always the Limit

Suppose an investor pays $2 million for original-issue QSBS. Ten times basis equals $20 million, so the investor’s potential cap can exceed both statutory dollar limits. If that block later produces $22 million of gain, up to $20 million may qualify for exclusion.

Founders often buy shares for a small amount, so the dollar cap does the work. Investors often put in enough capital for the 10 times basis rule to matter. Same statute, very different math.

The tax code is being generous here. It is not being casual.

Founders, Employees, and Investors Face Different Traps

Founders

Choose the entity with the likely financing path and exit market in mind. Venture-backed companies often need C-corp stock for institutional investors and option plans. A cash-flowing business likely to sell assets may still be better as an LLC or S-corp.

Buy founder shares early at a defensible price supported by contemporaneous records. If the shares vest, ask counsel about an 83(b) election and its 30-day deadline. A 409A valuation supports option pricing; it is not a magic QSBS stamp.

If you are still forming the company, use DailyDime’s startup legal guide as the broader checklist. QSBS belongs in that conversation before the first financing, not in the week before a sale.

Employees

The option grant date usually does not start the QSBS holding period. Exercise does, because that is when the company generally issues stock. A late exercise can create both a short holding period and a failed gross-assets test.

Employees should keep the option agreement, exercise notice, proof of payment, stock certificate or ledger entry, 83(b) election if applicable, and any company QSBS representation. Five years is a long time to reconstruct a missing email.

Angels and fund investors

Angels should confirm original issuance, the company’s asset level immediately before and after the round, and the actual business activities. A SAFE signed while the company is small may convert after the company crosses the asset ceiling.

Partnerships and funds can pass the benefit through, but the investor generally must have held a partnership interest when the partnership acquired the QSBS. The investor’s eligible amount can also depend on that ownership percentage. Selling the fund interest is not the same as the fund selling QSBS.

Gifts and trusts

QSBS can retain its character in certain gifts, and separate taxpayers may have separate caps. That creates planning opportunities, along with valuation, control, gift-tax, trust, and anti-abuse issues.

Do this early, for real non-tax reasons, and with counsel. A stack of last-minute trusts created after a deal is effectively done is an invitation to a much less enjoyable conversation.

What If You Sell Too Early?

Section 1045 may let you defer gain by rolling sale proceeds into replacement QSBS. You generally must have held the old stock for more than six months and buy replacement QSBS during the 60-day period beginning on the sale date. The IRS rollover rules also require an election and basis adjustment.

This is deferral, not forgiveness. The postponed gain reduces the basis of the replacement stock, and the reporting deadlines matter. Sixty days is not much time to find, diligence, and close another private-company investment.

When QSBS Loses to an LLC or S Corporation

QSBS is not the default winner for every business. Professional services, finance, insurance, hospitality, farming, and other excluded businesses may never qualify.

A C-corp can also lose during the operating years. It pays 21% on taxable income, and owners can face another tax when profits come out. Pass-through owners may benefit from single-level taxation and, depending on their facts, the qualified business income deduction.

Exit reality matters too. Main Street and lower-middle-market buyers often want assets for a tax-basis step-up and a cleaner liability break. If your likely buyer will not buy stock, model that outcome before choosing a C-corp for QSBS.

Run the full life cycle: operating tax, distributions, financing needs, state tax, likely buyer, likely deal structure, and exit value. The best entity on formation day can become the wrong one if the business model changes.

State Tax Can Rewrite the Answer

Section 1202 is a federal rule. States decide whether to follow it, and the answer can materially change the net proceeds.

California, for example, does not conform to the federal QSBS exclusion. A founder can owe zero federal tax on excluded gain and still owe a large state bill.

Residency planning has its own timing and substance rules. Changing an address after the LOI is signed does not make the old state disappear. The federal result can look beautiful while the state return quietly ruins the mood.

What to Do Before the Next Financing or Exit

• Ask a tax attorney or CPA who regularly handles Section 1202 to review eligibility. General startup experience is not the same thing.
• Build the substantiation file now, including issuance records, asset calculations, redemptions, and business-activity support.
• Model a stock sale, an asset sale followed by liquidation, and the same outcomes without QSBS.
• Check state conformity and residency before a transaction becomes binding.
• Put tax structure into the LOI discussion. Waiting for the purchase agreement is waiting too long.

The rules and examples reflect federal law as of August 2026. All examples simplify basis, character, and transaction costs. This article is educational and does not provide tax, legal, or accounting advice for your facts.

The Bottom Line

Section 1202 can exclude an extraordinary amount of federal gain: generally $10 million on older qualifying shares, $15 million on newer shares, or 10 times basis when that is larger. The trade is rigidity. You need the right corporation, original-issue stock, the asset test, a qualified active business, enough time, and a sale or exchange that actually reaches the shareholder.

Before you sign an LOI, have a Section 1202 specialist model the full path. One correct decision now can be worth millions later.

Section 1202 pays at closing, but the qualifying work starts when the shares are issued.