Understanding the New $15M QSBS Increase Under OBBBA

The One Big Beautiful Bill Act (OBBBA), enacted on July 4, 2025, significantly expanded Qualified Small Business Stock (QSBS) benefits under IRC §1202. One of the most transformational changes was increasing the per‑issuer capital gains exclusion cap from $10 million to $15 million, with indexing starting in 2027. This change enhances tax planning flexibility for founders, investors, and employees, especially in high-growth scenarios.

QSBS capital gains exclusion cap: Before OBBBA

To understand the impact of the new cap, it’s helpful to first review the prior framework. Until July 4 2025, QSBS provided a fixed exclusion cap that shaped exit and investment decisions.

Pre‑OBBBA exclusion rules

Under pre‑OBBBA law, the capital gains exclusion limit for QSBS was structured around two tiers:

• Fixed exclusion cap: Up to $10 million in gain per issuer, per taxpayer, during their lifetime.
• 10× basis alternative: If the taxpayer’s basis in stock exceeded the $1 million threshold, they could exclude up to 10 times basis, but capped by $10M.

These limits created a strict ceiling on tax-free gains, even for successful startups or substantial investments, and incentivized longer holding periods and layered planning strategies.

The OBBBA upgrade: $15M cap and inflation indexing

The key enhancement adopted under OBBBA was not just raising the cap, but also indexing it for inflation starting in 2027, ensuring that the benefit keeps pace with increasing valuations and dollar erosion.

Changes instituted by OBBBA

Here we’ll highlight the key cap-related updates introduced by the legislation:

• New per‑issuer exclusion cap: Raised to $15 million per taxpayer per issuer.
• Indexed starting in 2027: The cap will increase annually based on inflation thresholds.
• The 10× basis alternative remains unchanged, giving flexibility beyond the flat cap.

Why this matters

The $15M cap and indexing changes matter because:

• Investors in high-growth startups can now exclude more of their gain, especially when valuations surge.
• Annual indexing ensures the exclusion limit remains meaningful over time in real dollars, protecting long-term investors.
• Founders and employees benefit equally from expanded tax-free appreciation.

Impact on investors, founders, and employees

In this section, we examine how the new cap affects different stakeholders and alters planning scenarios.

Founders and equity holders

Raising the exclusion to $15M:

• Enables larger tax-free exits for founders who stay beyond holding thresholds.
• Supports liquidity events between 3–5 years (partially excluded under the new tiered system), reducing penalty for early exits.
• Catalyzes equity incentive design, especially for early-stage equity recipients.

Investors and high-net-worth backers

Major implications include:

• More flexibility for investors to take gains earlier while still excluding a greater portion tax-free.
• The higher cap opens up opportunities for trust stacking and entity-level planning without hitting exclusion limits prematurely.

Employees and option holders

While SAFEholders and option holders still face conversion costs, the higher cap:

• Makes exercising and downstream holding more attractive, even if valuation appreciates significantly.
• Expands the value of shared gains for team members in rising companies.

Strategic considerations and scenarios

Applying these changes effectively requires careful planning around timing, valuation, and stock classification.

Timing equity issuance and exits

How stakeholders can optimize the new cap:

• Prioritize post‑July 4 issuances for QSBS eligibility under the new cap.
• Time liquidity events based on the tiered exclusion rules to balance liquidity and tax benefit.
• Coordinate exits among shareholders to maximize cap utilization.

Planning for inflation-indexed caps

Although indexing starts in 2027, advisors should:

• Forecast cap values in multi-year plans to ensure accurate tax projections.
• Compare fixed $10M versus indexed thresholds for different stakeholder classes.
• Adjust estate and gifting strategies to accumulate higher exclusion capacity over time.

Managing mixed-level caps

If a taxpayer holds both pre- and post-OBBBA QSBS stock:

• Cap calculations differ per regime; $10M cap applies for pre-July‑4 stock, and $15M (indexed) for post‑July 4 stock.
• Each issuance should be tracked separately per issuer and taxpayer.

Rules that remain the same

Although the cap changed, other QSBS fundamentals remained consistent under OBBBA.

10× basis alternative

Even under the new rules, taxpayers who paid substantial basis remain eligible to exclude gains up to 10× their basis, subject to the cap:

• This alternative often benefits early investors with high bases.
• The cap increase doesn’t affect this option beyond expanding the maximum limit.

Alternative Minimum Tax status

Regardless of cap limits, QSBS gain excluded under §1202 remains an AMT preference item. However, the excluded portion is not subject to tax in alternative minimum tax calculations.

Other core eligibility conditions

Corporate structure, gross asset, active business, and issuance rules remain unchanged:

• Stock must be original issue from a domestic C‑corporation.
• Gross assets must remain below threshold at issuance.
• Active trade or business requirements must be met.

Real-world illustrative examples

This section demonstrates how the new QSBS cap provides tangible benefits for stakeholders.

Example: Founders with high-valued exit

Imagine a founder sells QSBS stock worth $20M in gain:

• Pre-OBBBA: Only $10M excluded, rest taxable.
• Post-OBBBA: $15M excluded (with potential indexing benefit), saving significantly more in taxes.

Example: Investor with layered trust holding

An investor holds multiple QSBS positions in separate trusts:

• Pre-OBBBA: Each trust limited to $10M exclusion cap.
• Post-OBBBA: Each trust can now exclude up to $15M, multiplied by trusts/entities, dramatically increasing exclusion capacity.

Example: employee option holder

An employee exercises options five years post-issuance:

• Gain realized: $12M.
• Pre-OBBBA: $10M excluded.
• Post-OBBBA: Entire $12M excluded due to new cap – assuming post-July issuance.

Actionable planning tips

To maximize the benefit of the new cap, stakeholders should follow these best practices.

Work with QSBS-savvy advisors

Engage tax counsel and advisors familiar with OBBBA and QSBS to:

• Identify cap usage opportunities.
• Model future indexed thresholds.
• Coordinate exit timing and multi-party exclusions.

Establish regime-level records

Maintain clear documentation for each issuance:

• Track whether stock falls under pre- or post‑OBBBA rules.
• Keep basis, issuance dates, and valuation snapshots.
• Separate cap tracking per issuer, per taxpayer, per regime.

Align exit strategies with cap limits

• Coordinate holding durations and sale timing to fall within tiered exclusion periods.
• Prioritize liquidity events based on the current or anticipated cap levels.

Monitor indexed cap values

Beginning in 2027, review annual cap adjustments:

• Cap increases may shift planning thresholds year-to-year.
• Incorporate inflation indexing into projections and agreements.

Unlock the full value of the new QSBS cap

OBBBA’s increase of the QSBS capital gains exclusion cap from $10 million to $15 million (indexed) represents a dramatic expansion of Section 1202 benefits. This change enables higher tax-free gains per issuer, greater planning flexibility for high-growth equity, and stronger incentives for early-stage founders, investors, and employees.

That said, effective use depends on:

• Understanding tiered exclusion rules (3, 4, 5‑year holding schedules).
• Tracking pre‑ vs. post‑OBBBA stock properly.
• Structuring equity issuance, exits, and entity-level planning strategically.

By partnering with experienced advisors and maintaining disciplined documentation, stakeholders can unlock the full potential of QSBS in the post‑OBBBA era, maximizing tax exclusion while preserving agility and flexibility for future planning.

DISCLOSURE:

Augustus Wealth, LLC is a registered investment adviser. Advisory services are only offered to clients or prospective clients where Augustus Wealth, LLC and its representatives are properly licensed or exempt from licensure. This financial planning assessment is solely for informational purposes. Past performance is no guarantee of future returns. Investing involves risk and possible loss of principal capital. This assessment is built based off information provided by the client and cannot be relied upon as financial advice. No advice may be rendered by Augustus Wealth, LLC unless a client service agreement is in place.