QSBS stacking and packing: A founder’s exit strategy

QSBS stacking and packing strategies increase tax exclusion by multiplying shareholders and raising cost basis through gifting, trusts and entity conversions.

QSBS: An overview

The qualified small business stock (QSBS) exemption offers founders, early employees, and investors in certain companies the ability to exclude up to $15 million of capital gains (or 10x their basis, whichever is greater) at exit. QSBS stockholders can use two strategies—QSBS stacking and QSBS packing—to potentially reduce or even eliminate capital gains taxes altogether.

Note that not all stock qualifies for QSBS. Companies must meet several statutory requirements under the Internal Revenue Code (IRC), including having less than $75 million of gross assets at the time when shares are issued.

What is QSBS stacking?

QSBS stacking is a tax planning strategy that multiplies the QSBS gain aggregate exclusion by gifting shares to other individuals or trusts before a sale. It is a way to legally increase the total amount of capital gains that can be shielded from taxes across your family, effectively managing your tax exposure, though not without risk. The strategy works because the exclusion limit applies on a per-taxpayer basis.

Think of your personal QSBS exclusion as one tax-free "bucket" for your capital gains. Once that bucket is full, any additional gains you realize will spill over and be subject to federal income tax. QSBS stacking allows you to create several additional empty buckets by transferring your stock to others, such as your children or specially designed trusts. Each new taxpayer who receives your gifted stock gets their own separate exclusion bucket, allowing your family to collectively shelter more of the total gain from taxes.

How to use gifts and trusts for QSBS stacking

QSBS stacking is a powerful estate planning tool for business owners—transferring QSBS shares to irrevocable trusts can optimize wealth transfer and estate tax planning.

The tax code allows you to gift QSBS to others without the stock losing its qualified status, which is the core mechanism behind QSBS stacking. The person or entity that receives the gift also inherits your original holding period and cost basis; under the tax code, this transfer ensures the recipient is treated as having acquired and held the stock just as you did, allowing them to qualify for the exclusion when it's eventually sold.

Key risks and rules for QSBS stacking

While QSBS stacking is a powerful strategy, it is also a complex area of tax law with rules that must be followed carefully. As a founder, it's important to be aware of the potential pitfalls to ensure your planning is effective and can withstand scrutiny from the IRS.

• The multiple trust rule: If you create multiple trusts for the same beneficiary with the primary purpose of tax avoidance, the IRS has the authority under Section 643(f) to collapse multiple trusts and treat them as a single entity for tax purposes.

• The burden of proof: It is always the taxpayer's responsibility to prove that their stock qualifies as QSBS and that they have met all the necessary requirements.

• State tax conformity: Not all states follow the federal rules on QSBS, which can impact your tax position significantly.

What is QSBS packing?

While stacking focuses on multiplying the number of taxpayers, QSBS packing is a strategy that focuses on maximizing the annual exclusion limit for a single taxpayer. It works by intentionally increasing the cost basis of your stock.

How to increase your basis with entity conversions and high-basis stock

There are two primary methods for executing a packing strategy:

1. LLC to C corp conversion: Converting your business entities can establish a higher initial basis for your stock.
2. High-basis stock sales: Selling private company stocks with a high basis can significantly increase your annual exclusion limit.

The QSBS packing process

1. Evaluate eligibility: Ensure your company qualifies as a QSBS under IRS guidelines.
2. Convert your entity: This can involve converting an LLC into a C corporation.
3. Be mindful of timing: Ensure compliance with holding requirements for QSBS exemption.

When should you start your QSBS planning?

QSBS stacking and packing are not last-minute tactics. They depend on long-term strategies instituted from the early growth phase of your company.

State tax considerations for QSBS

Consult with a tax professional about the rules in your state of residence and the states where your company operates.

Frequently asked questions about QSBS stacking and packing

What is the 80% active business requirement?

A company must use at least 80% of its assets in the active conduct of a qualified trade or business for substantially all of the shareholder's holding period.

Can my spouse and I both claim the QSBS tax exemption?

For QSBS acquired on or after July 5, 2025, the per-taxpayer exclusion cap has increased to the greater of $15 million or 10 times the adjusted basis.