Here is a question I get asked constantly: "I'm looking at a $40 million exit. Can I really only exclude $15 million under Section 1202?"
The answer is no — with proper planning, you may be able to exclude far more. In some cases, the entire gain.
The key is a strategy called QSBS stacking, and it is the single most powerful tax planning technique available to founders and early-stage investors approaching a significant exit.
The Basic Math: Why Stacking Works
Under Section 1202 of the Internal Revenue Code, as enhanced by the One Big Beautiful Bill Act (OBBBA), a taxpayer can exclude the greater of $15 million or 10 times their adjusted basis in qualified small business stock per issuer.
The critical word in that sentence is taxpayer. The exclusion is per taxpayer per issuer — not per company, not per transaction. Every individual or qualifying entity that holds QSBS gets their own exclusion.
A married couple where both spouses hold QSBS? That is $30 million in exclusion. Add two adult children? $60 million. Add two non-grantor trusts? $90 million.
This is not a loophole. It is the plain text of the statute. But it requires advance planning, proper execution, and careful attention to the rules that can disqualify the strategy.
Level 1: Spousal Stacking
The simplest form of stacking involves both spouses holding QSBS directly. If each spouse owns qualifying stock, each gets their own $15 million exclusion — $30 million total.
There are two ways to achieve this:
From the start. When the company is formed, both spouses can be listed on the cap table as separate stockholders. Each spouse acquires stock at original issuance, satisfying the Section 1202 requirement.
Through gifting. One spouse gifts QSBS to the other. Under Section 1041, transfers between spouses are tax-free, and the recipient spouse takes the donor's basis and holding period. The recipient spouse then has their own $15 million exclusion.
A note on community property. Washington is a community property state. Whether community property QSBS automatically provides both spouses with separate exclusions is an unsettled question. The safest approach is to hold the stock as separate property — either through a prenuptial or postnuptial agreement, or by having each spouse on the cap table independently from the start. Do not assume community property treatment gives you automatic stacking; structure it deliberately.
Level 2: Gifting to Family Members
Every family member who receives QSBS before a sale gets their own $15 million exclusion. Adult children are the most common recipients.
How it works. You gift shares of QSBS to your adult children (or other family members). Under Section 1202(h)(2)(A), the recipient takes the donor's holding period and basis. The recipient then sells the stock and claims their own Section 1202 exclusion.
Gift tax considerations. For 2026, you can gift up to $19,000 per recipient per year ($38,000 if both spouses elect gift splitting) without using any of your lifetime exemption. For larger gifts, you use a portion of your lifetime gift and estate tax exemption, which is currently approximately $15 million per person under the OBBBA.
For a founder with stock worth $0.001 per share, gifting millions of shares triggers minimal gift tax because the gift is valued at the fair market value at the time of the gift — not the eventual sale price. This is why timing matters: gift the stock when it is worth little, and the gift tax cost is negligible.
The critical rule: gift before any sale is on the horizon. The IRS can recharacterize a gift-then-sale as an assignment of income if the gift appears to be a prearranged step in a single transaction. If you gift stock on Monday and the company announces an acquisition on Tuesday, the IRS will argue that you effectively sold the stock yourself and assigned the proceeds.
There is no bright-line rule for how far in advance gifts must be made. The further removed the gift is from any sale discussions, the safer it is. Gifts made years before an exit are virtually bulletproof. Gifts made after a letter of intent is signed are virtually indefensible.
Level 3: Trust Stacking — The Advanced Play
Trusts are where the real multiplication happens. A properly structured trust is a separate taxpayer for federal income tax purposes, entitled to its own $15 million QSBS exclusion.
Non-grantor trusts. These are the cleanest structures for QSBS stacking. A non-grantor trust is a separate taxpayer with its own tax ID number. The IRS has not challenged the position that non-grantor trusts receive their own Section 1202 exclusion. Each non-grantor trust you create and fund with QSBS gets a $15 million bucket.
Grantor trusts and IDGTs. Intentionally defective grantor trusts (IDGTs) are commonly used in estate planning. For income tax purposes, a grantor trust is disregarded — all income is reported on the grantor's personal return. The question is whether a grantor trust gets its own Section 1202 exclusion or whether it shares the grantor's.
This is an unsettled area. The IRS has not issued definitive guidance. Some practitioners take the position that grantor trusts are separate taxpayers for Section 1202 purposes; others disagree. If you want certainty, use non-grantor trusts for QSBS stacking.
How many trusts is too many? There is no statutory limit on the number of trusts that can hold QSBS. However, the IRS can challenge structures that lack economic substance. Each trust should have a genuine purpose beyond tax avoidance — different beneficiaries, different distribution standards, different trustees. Creating ten identical trusts with the same beneficiary solely to multiply the exclusion invites scrutiny.
A reasonable approach: create separate trusts for each child or family line, with distinct terms and independent trustees. Two to four trusts is common and defensible. Ten trusts for a single beneficiary is aggressive.
The Mechanics: Step by Step
Here is how a stacking strategy is typically implemented:
Step 1: Confirm QSBS qualification. Before gifting any stock, verify that it qualifies under Section 1202 — C corporation, gross assets under $75 million at issuance, active business requirement, original issuance to the donor. If the stock does not qualify as QSBS, stacking is irrelevant.
Step 2: Establish trusts and identify recipients. Create non-grantor trusts with independent trustees and distinct beneficiaries. Identify adult children or other family members who will receive stock.
Step 3: Gift QSBS well in advance of any sale. Transfer stock to each trust and family member. Obtain qualified appraisals for gift tax reporting. File gift tax returns (Form 709) as required.
Step 4: Wait. The gifts must be completed and genuine. Do not begin sale negotiations immediately after gifting. The longer the gap between gift and sale, the stronger your position.
Step 5: Each holder sells independently. When the company is eventually sold, each trust and family member sells their own stock and claims their own Section 1202 exclusion on their own tax return.
Common Mistakes That Blow Up Stacking
Gifting after a letter of intent. This is the number one mistake. Once a deal is being negotiated, it is too late to gift. The IRS will apply the step transaction doctrine and treat the entire sale as yours.
Prearranged transactions. Even without a formal LOI, if you gift stock while actively marketing the company for sale, the IRS can argue the gift and sale were prearranged steps. Keep gifting and deal-making in separate timelines.
Assignment of income. If you have already earned the right to the sale proceeds — through a binding agreement or constructive receipt — gifting the stock does not shift the income. The income is yours regardless of who holds the stock.
Trusts without substance. Trusts created solely for tax avoidance, with no independent trustee, no genuine beneficiaries, and no economic purpose, can be disregarded by the IRS. Each trust must stand on its own as a legitimate estate planning vehicle.
Inadequate documentation. Keep records of every gift: board consents, stock transfer forms, gift tax returns, appraisals, trust agreements, and correspondence showing the gifts were made independent of any sale process.
Washington State Implications
For Washington residents, QSBS stacking is doubly powerful. QSBS gains excluded under Section 1202 are not included in federal adjusted gross income, which means they are also excluded from Washington's 7% capital gains tax and the new 9.9% income tax (ESSB 6346, effective 2028).
The Washington legislature considered decoupling from the federal QSBS exclusion during the 2026 session (SB 6229 and HB 2292). Those bills did not pass. Under current law, stacking multiplies your Washington tax savings alongside your federal savings.
A founder in Seattle who stacks $75 million in QSBS exclusions across family members and trusts could avoid approximately $7.4 million in Washington capital gains tax and $7.3 million in Washington income tax — in addition to the federal savings.
There is no guarantee future legislatures will not revisit this. Plan accordingly.
Worked Example: The Chen Family
Sarah Chen founded a SaaS company in 2021 as a C corporation. She and her husband David each received 1.5 million shares at $0.001 per share. Over the next two years, they gifted 750,000 shares each to two adult children and two non-grantor trusts.
In 2027, the company is acquired for $12.50 per share. Total gain: approximately $75 million.
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Without stacking: Sarah alone would exclude $15 million and owe tax on $60 million — approximately $18 million in combined federal and Washington tax.
With stacking: The family excludes $67.5 million and owes tax on only $7.5 million — approximately $2.25 million in combined tax.
Tax savings from stacking: approximately $15.75 million.
And with slightly different allocation (more shares to trusts and children, fewer to Sarah and David), the family could have excluded the entire $75 million.
The Bottom Line
QSBS stacking is not something you implement when a deal is on the table. It is something you plan years in advance, ideally at or near the time of company formation.
If you are a founder holding appreciated startup stock, the time to think about stacking is now — not when a buyer shows up. The same goes for angel investors sitting on QSBS in multiple companies.
The $15 million per-taxpayer exclusion is generous. But with proper planning, it is just the starting point.
For a complete treatment of QSBS qualification, the OBBBA enhancements, and Washington State tax implications, see [The Complete Guide to QSBS & Section 1202](/the-complete-guide-to-qsbs-section-1202/).
For a comprehensive planning guide covering QSBS, domicile, entity structure, and the 2026-2028 planning window, get the [Washington State Tax Planning Guide for High Earners](https://joewallin.gumroad.com/l/mtvvb).
Have questions about QSBS stacking for your specific situation? [Book a 20-minute intro call.](/book-a-call)
