QSBS Rollovers: The Definitive Section 1045 Resource

Qualified Small Business Stock (QSBS) is incredible. It rewards those who start, build, and invest in (usually) fast growing businesses that change the world. It's an incentive as much as it is a mechanism for keeping money in the hands of people who do the most building and innovating. It's extremely important that we maintain the spirit behind QSBS: which is that American innovation, (and the founders who drive that train), is worth reinvesting in.

The benefits can be massive. With proper planning, QSBS and QSBS rollovers can help you protect millions of dollars in otherwise taxable income when stock is sold.

QSBS rollovers in particular are often quite misunderstood and challenging to execute. A rollover is necessary when you sell stock “too early” for QSBS purposes (usually pre 5 years), or make “too much” from a stock sale (usually more than $10-15 million). The following sections will take you through rollover planning and some general QSBS considerations along the way.

Section 1045 allows an eligible non-corporate taxpayer (you as an individual!) to sell qualified small business stock, buy new stock in another company with the cash (within 60 days of sale), and defer the eligible gain. Individuals and certain trusts can use the benefit too.^[1][7]

A shareholder would opt for a rollover when they haven't met some portion of the QSBS holding period requirement (like selling before 5 years). When you reinvest cash from a sale through a rollover, the holding period “tacks on” to the new stock and can help you continue your QSBS clock. This is powerful because 1) the transactions puts you into tax deferral on your original sale and 2) it could create a pathway to a tax free exit down the road (once requirements are met).

Suppose you sell founder shares for $8 million with zero cost basis (an $8 million taxable gain) and make a qualifying $8 million rollover. You defer $8 million of gain, and the replacement shares generally have zero basis after the adjustment. That gain remains relevant to a later sale and could allow you to take all of that money tax free in the future.

Rollovers can also be powerful when you sell stock and exceed the standard exclusion limit (which is either $10 million or $15 million depending on when you acquired your stock). Each new rollover is generally eligible for a new $10-15 million benefit because you'll be getting new stock from a new issuing company.

Your sale arrives before the exclusion is available

For qualifying shares acquired after September 27, 2010, and on or before July 4, 2025, the familiar 100% federal exclusion generally requires a holding period of more than five years.^[2]

If you have held the stock for more than six months, a Section 1045 rollover may let you defer eligible gain and continue the holding period through replacement stock. You are not required to roll over. You can sell and pay the applicable tax. A rollover is an option for preserving potential QSBS benefits when an otherwise attractive sale comes early.

Many shareholders elect to roll over the portion of cash gain that they don't expect to immediately “need” for their lifestyle plans, if the stock didn't qualify right away for QSBS. Sometimes a founder, investor, or early employee will have stock that qualifies for QSBS because they held it long enough, and another tranche of stock that doesn't yet qualify (because it was acquired later).

Your gain exceeds the available exclusion

Completing the holding period does not necessarily make the entire sale tax-free. Section 1202 limits the gain eligible for exclusion. Prior sales, stock basis calculations, acquisition dates, and ownership arrangements can affect the available amount.

A rollover may help defer gain that the current exclusion does not cover. The planning should address both the tax treatment of the original sale and the eventual treatment of the replacement shares.

The 2025 legislation expanded Section 1202. It did not alter or replace Section 1045's 60-day purchase window or its more-than-six-month holding requirement.^[1][4]

The following comparison covers the modern 100% exclusion cohort and the newer rules. Stock acquired on or before September 27, 2010, needs separate analysis.

(These are starting points, not a personal exclusion determination. Prior exclusions, married-filing-separately rules, and holdings spanning both regimes can change the calculation. The percentage applies to eligible gain within the applicable limit; the table does not mean every sale receives that percentage of its entire proceeds tax-free.)^[2]

The company-size test changed too. The gross-assets ceiling generally rose from $50 million to $75 million for stock issued after July 4, 2025, with inflation adjustments after 2026. This is a statutory assets test, not a company's headline valuation and stock issuance date matters for this test.^[4]

The rollover purchase window period begins on the date of the sale. It is not 60 days from receiving a tax estimate, deciding on a strategy, or filing a return. In order to successfully begin a QSBS rollover, you must invest cash from an eligible stock sale into new stock (make a purchase) within 60 days. It should also be noted that generally a signed intention to invest is not the same as completing the actual purchase.^[1]

For a sale still a few months away, use the time to confirm the original shares' history, estimate the gain, and assess rollover options if applicable. That work can proceed alongside the sale process and our team most often begins working with clients on planning within 90 days of a transaction.

As closing approaches, the plan should become specific: the amount to roll over, the documents needed to purchase the shares, and the team of people responsible for each step. Your tax adviser should confirm the sale date and resulting deadlines.

After the sale, completing the rollover purchase becomes the immediate priority. Keep evidence of the purchase date, payment, share issuance, and qualification analysis. When we help clients with rollovers, we start building an extensive QSBS packet at this stage, and even help coordinate supporting tax or legal memos and opinions when necessary.

Discuss your timeline

QSBS is a benefit applied to capital gains, which is generally the difference between your cost basis and sale amount. Most founders have no, or very little basis in their stock, and so just about all of their sale proceeds are capital gains and subject to a significant tax rate (albeit lower than personal income tax).

A founder with almost no basis

Maya sells qualifying shares for $12 million. Assume zero cost basis and no transaction expenses. She purchases $9 million of qualifying replacement stock within the 60 day rollover window.

She defers $9 million, and recognizes $3 million. Whether any recognized gain qualifies for a Section 1202 exclusion requires a separate analysis, but if her shares weren't QSBS eligible based on holding period, this would mean she pays taxes on $3 million and the $9 million is deferred in the replacement stock (with the ability to qualify fully for QSBS in the future).

An investor with meaningful basis

Daniel sells qualifying shares for $12 million. His basis is $2 million, so his gain is $10 million. He purchases $9 million of qualifying replacement stock.

The proceeds exceed the replacement purchase by $3 million. Daniel therefore recognizes $3 million and defers $7 million, not $9 million. His replacement-stock basis is $2 million after the adjustment.

So what options do you actually have to complete one of these rollover transactions? For most people, the decision making comes down to practical questions about current investment opportunities, control, flexibility, and capital risk. The replacement investment must be qualifying (QSBS) stock. So, in practical terms, you can put money into someone else's business or into a qualifying business you own and control. Your own new business could pursue an acquisition as a go to market approach or develop a new operating business on day one.^[1][8]

Invest in another company

You can purchase newly issued qualifying shares from an eligible company (perhaps and Angel investment). The company may already have a team, product, customers, and a financing process. That can make it easier to evaluate a defined opportunity within the rollover period.

The challenge is getting these deals to line up with your rollover window, and frankly, having enough deals to make a rollover transaction of any size, meaningful.

Acquire an operating business

Most people aren't swimming in hot venture deals that they can invest several million dollars worth of recent gains into (and maybe the idea of dumping millions into someone else's company after you just sold part of your own makes you feel queasy).

Another option is to seek out a business that you could fully acquire and start operating (or which already has installed management). This can work, but timing is still a problem, and you risk inheriting someone else's mistakes and problems along the way.

Transaction form, timing, subsidiary arrangements, and the business's activities all matter in this calculation and should be considered.^[2][8]

Build a new business

A reasonable option is to start and acquire stock in your own new company. Call it a “startup” or a “side project”, but it needs to be QSBS eligible in structure (C Corp, etc), and the stock you get as the founder and investor has to be directly from the company.

This is the most common approach that our clients take because it keeps control in your hands. You are the founder, you call the shots, control the bank account, and determine the commercial activity of the business. Our team at QSBS Rollover specializes on all forms of rollover transactions, but the founder-owned NewCo is our bread and butter. We provide all of the coordination expertise on the QSBS issues, business infrastructure, and tools to execute this form of rollover without losing your sanity or overcommitting yourself in the process.

This strategy allows you to roll over much larger amounts of capital without the inherent 3rd party risks you would encounter in every other rollover plan.

Invest in another company

You can purchase newly issued qualifying shares from an eligible company. The company may already have a team, product, customers, and a financing process. That can make it easier to evaluate a defined opportunity within the rollover period.

Your influence depends on the rights you negotiate. A minority investment usually leaves daily operations and spending decisions with someone else. Review the business opportunity as well as the qualification documents, information rights, and governance terms.

Buying an existing shareholder's shares generally does not satisfy the original-issuance requirement. An attractive investment and an eligible replacement purchase are not necessarily the same thing.^[2]

Acquire an operating business

A properly structured acquisition can give a founder control over an operating business with an existing team, revenue, or customer base. The rollover investment still needs to take the form of qualifying replacement stock. Writing a personal check to buy a seller's existing shares is not, by itself, a qualifying rollover.

The company receiving the rollover investment may acquire business assets or pursue another structure that counsel confirms satisfies the rules. Transaction form, timing, subsidiary arrangements, and the business's activities all matter. Those decisions belong in the acquisition plan, not as an afterthought.^[2][8]

Build through a company you control

A qualifying company can use rollover capital to develop a product, launch an operation, or carry out qualifying research and startup activities. The business does not necessarily need revenue on the investment date. It does need a substantive plan and compliance with the applicable requirements.^[2]

You do not have to arrive with a complete operating team or manage every step yourself. Our team provides tax and legal coordination alongside operational support for founder-controlled build and acquisition paths. The aim is to keep decisions with the founder while reducing the planning and execution work they must personally carry.

Control matters because it can let you set budgets, approve spending, choose management, and adjust the operating plan. Both acquire and build paths can provide substantial control. Neither automatically provides liquidity or protects the value of the investment.

The company's bank account remains the company's money. A controlled company needs a real business purpose, appropriate governance, and a budget that supports its activities. It is not a personal account for temporarily holding exit proceeds.

The review begins with the issuer and the purchase. The replacement shares generally must be newly issued stock in a qualifying domestic C corporation, acquired through a qualifying purchase. The company must satisfy the applicable gross-assets test and active-business requirements. Redemptions and certain other transactions can affect qualification.^[1][2]

Business activity matters as much as entity type. Section 1202 excludes specified service businesses and other categories, including financing, investing, and certain hospitality businesses. Forming a C corporation does not, on its own, make its stock QSBS.

At the same time, an industry label does not answer every question. A business that sells software to a healthcare provider is not necessarily performing healthcare services itself. The analysis should describe what the company actually does, how it earns revenue, and how it uses its assets.

If the answer is not clear, a focused review with experienced counsel can identify the relevant facts and document the conclusion.

Discuss business qualification

Alex acquired qualifying founder shares in 2022 and sells after holding them for four years. Assume $8 million of proceeds, zero basis, no transaction expenses, and no available Section 1202 exclusion because the required holding period has not been completed.

Alex buys $8 million of qualifying replacement stock within the Section 1045 window and makes a valid election. The rollover defers $8 million of gain.

At an illustrative 23.8% federal rate, that represents $1.904 million of federal tax postponed. The rate assumes the entire otherwise taxable gain would bear the 20% long-term capital-gains rate and the 3.8% net investment income tax. It excludes state and local taxes.^[10][11]

Alex's original holding period generally carries over. The time between selling the original shares and buying the replacement shares does not itself add stock ownership time. The advisers should calculate the remaining period rather than assuming the original fifth anniversary always controls.^[3]

If Alex later sells the replacement stock after meeting the applicable holding period and all other requirements, some or all of the gain may qualify for exclusion. Until then, the immediate benefit is deferral, not a completed $1.904 million tax saving.

A rollover can remain useful even when your original shares have satisfied the holding period. Section 1045 does not impose the same dollar cap on deferral that Section 1202 imposes on eligible gain for exclusion.^[1][2]

Consider Jordan, who sells older-regime QSBS held for more than five years. Assume $30 million of proceeds, zero basis, and a full $10 million exclusion available for the original issuer. For this illustration, assume advisers confirm that the exclusion and rollover are properly coordinated.

Jordan buys $20 million of qualifying replacement stock. The simplified rollover calculation leaves $10 million recognized and defers $20 million. If the recognized $10 million qualifies for the available exclusion, the transaction can combine a current exclusion with deferral of the remaining gain.

At an illustrative 23.8% federal rate on the otherwise taxable $20 million, the current federal tax postponed is $4.76 million. This is not a promise that the entire replacement investment will later qualify for exclusion.

For a founder who is too close to closing for appropriate pre-sale trust planning, this can be an important conversation. The rollover has its own requirements and deadlines; it does not depend on completing a pre-sale gift.

An IPO does not automatically remove QSBS status from shares that qualified when issued and continue to satisfy the relevant requirements. A founder's original shares can therefore present a Section 1045 opportunity after the company goes public. Shares purchased on the public market are a different case and generally do not qualify as original-issue QSBS.^[2][12]

A founder sells original shares after the lockup

Elena acquired qualifying founder shares before July 5, 2025. After the company goes public and the applicable selling restrictions end, she sells a block of her original shares that she has held for more than five years.

Assume $25 million of proceeds, zero basis, and an available $10 million Section 1202 exclusion. Elena's advisers confirm continued QSBS eligibility and the interaction between her exclusion and rollover.

She purchases $15 million of qualifying replacement stock within the window. In this simplified example, she recognizes $10 million that qualifies for exclusion and defers the remaining $15 million. At an illustrative 23.8% federal rate, the rollover postpones $3.57 million of federal tax on the otherwise taxable gain.

The IPO date does not start the 60-day rollover window. The relevant sale does. If Elena sells shares on several dates, her advisers need to track the purchases and deadlines against the relevant sales. Securities-law restrictions and company trading policies also need to fit the plan.

Trust planning and rollovers address different parts of a founder's situation. A trust may change ownership and the taxpayer entitled to claim an exclusion. A rollover changes when eligible gain is recognized and which investment carries that gain forward.

Section 1202 contains rules that can preserve acquisition characteristics and holding periods for qualifying gifts. But transferring shares to a trust does not automatically create a separate taxpayer or an additional exclusion. Trust tax status, beneficiaries, retained powers, timing, and the broader transaction all matter.^[2]

This is why rollover planning and estate planning should share the same transaction facts. Depending on the circumstances, an appropriately planned trust may hold stock, claim an exclusion, or participate in a rollover. These decisions need coordinated advice rather than a template designed only to multiply a tax number.^[12]

Some QSBS trust questions lack direct guidance. That is a reason to use a seasoned trust-planning professional who regularly advises founders, preferably within an established law firm or advisory practice. The professional should explain the position, the supporting authority, and the documentation it needs.

We can introduce you to professionals in our vetted network and coordinate the rollover work with their advice. If the sale is already close, the first step is to determine what planning remains appropriate on the actual timeline.

The ability to explain a transaction depends on the records behind it. A short statement that stock “is QSBS” is useful background, but it is not a substitute for the underlying facts.^[13][14]

Establish the original shares' history

Keep the issuance and acquisition documents, capitalization records, basis information, and evidence supporting the relevant dates. The qualification record should address the company's assets at issuance, its business activities, and relevant transactions during the holding period.

If information sits with company counsel, the finance team, or a former service provider, request it while those people are still available. Resolve inconsistent dates and descriptions before they become assumptions in a tax return.

Document the replacement investment

Keep the subscription and issuance records, payment evidence, ownership details, and qualification analysis. For a controlled company, include the business plan, capital budget, governance documents, and records of the business's activities.

The documents should tell the same story as the transaction. If the plan changes, record what changed and why. More relevant, consistent evidence is better than an unsupported conclusion, but accumulating documents does not replace satisfying the rules.

Connect the transaction to the return

Maintain a calculation that connects proceeds, basis, replacement cost, deferred gain, recognized gain, and any claimed exclusion. Keep the election and filed-return records with that calculation.

A dedicated team can organize this work across the company, counsel, and tax preparer. That reduces the chance that a completed transaction reaches filing season without the information needed to report it.

Section 1045 treatment requires an election. IRS Revenue Procedure 98-48 provides the basic procedure for making it on a timely filed return, including extensions, for the year of the sale.^[5]

Completing the investment does not eliminate the reporting step. Give your tax preparer the sale records, replacement purchase records, qualification analysis, and basis calculations. Confirm who will prepare the election and review the filed return.

Current Form 8949 instructions include a reporting adjustment for a Section 1045 rollover. Your preparer should use the instructions applicable to the return being filed and address any partnership or trust reporting separately.^[6][7]

The 60-day investment deadline and the tax-return filing deadline serve different purposes. An extension to file the return is not an extension to make the replacement investment.

Start with the gain that would otherwise be taxable, not the headline exit value. Then identify how much a qualifying rollover would defer and which taxes apply to that gain.

For a high-income founder whose otherwise taxable gain is fully subject to a 20% federal long-term capital-gains rate and 3.8% net investment income tax, $2 million of deferred taxable gain corresponds to $476,000 of federal tax postponed. At $15 million, the same illustration produces $3.57 million.^[10][11]

Those examples use a rate, not a universal rule. Stock held for more than six months may qualify for Section 1045 while still producing short-term gain if sold before completing the long-term holding period. Taxable gain associated with a partial Section 1202 exclusion can also require different rate treatment.^[1][10]

An existing exclusion changes the answer too. If the original sale already qualifies for a full exclusion, rolling over that same gain does not create an additional current federal tax saving. The calculation should compare the tax with and without the rollover.

State and local treatment needs its own check

State treatment does not always follow federal treatment. A state may treat the Section 1202 exclusion differently from the Section 1045 rollover. Residency, sourcing, sale year, and local taxes can also change the result.

Do not add a state's top rate to 23.8% and assume the sum measures your rollover benefit. Confirm that the state recognizes the relevant deferral, determine which gain remains taxable, and account for interactions in the tax calculation. A federal-only estimate can still be useful if it clearly leaves state and local amounts unmodeled.

The QSBS incentive connects founder outcomes with financing for young businesses. A rollover gives an eligible seller a way to keep capital invested in qualifying companies rather than recognize all eligible gain immediately.

Economic research provides some context for that incentive. A January 2026 working paper by Jun Chen and Joan Farre-Mensa studies the 2010 expansion of the Section 1202 exclusion. It reports the following estimated effects in its study setting.^[15]

These are study estimates, not forecasts for an individual company. The paper studies Section 1202, not the independent effect of Section 1045 rollovers, and the cited version is a working paper rather than a final journal article.

The practical connection is narrower: QSBS tax treatment can affect the incentives around starting and financing businesses. Section 1045 provides one way for eligible proceeds from an earlier investment to fund another qualifying business.