How to track which of your shares qualify for the new QSBS tax tiers

Your QSBS holding period doesn't start on one date. It starts on dozens, one for every batch of options you exercised. Since July 2025, each batch can sit in a different tax tier depending on exactly how long you've held it, not just whether you've crossed the old five-year line.

Tracking this by memory, or trusting your cap table software to flag it automatically, is how founders find out at their liquidity event that half their shares only qualify for a 50% exclusion instead of the 100% they assumed. Here's how to actually track it, tranche by tranche, before that surprise happens.

Why one holding period turned into dozens

For restricted stock, the clock starts the day you receive the shares. For stock options, whether ISOs or NSOs, the clock doesn't start until you exercise and actually hold the stock. Grant date does not count.

Most founders and early employees don't exercise everything on day one. They vest monthly over four years, often with a one-year cliff, and exercise in batches. Without an 83(b) election, each vested tranche starts its own five-year (or now three-year) clock on the date it's exercised.

Run the math on a standard four-year monthly vest with a one-year cliff and you can end up with 37 separate holding-period start dates from a single option grant. The last tranche won't hit its five-year mark until nine years after the original grant date, even though the whole grant looks like one equity award on paper.

The new tiered exclusion made tracking non-optional

Before July 2025, this was annoying but binary: a share either had five years on the clock or it didn't. The One Big Beautiful Bill Act (OBBBA) changed that for any QSBS acquired after July 4, 2025, by splitting the exclusion into three tiers instead of one cliff.

Holding period: 3 years → Exclusion: 50% → Tax rate on the non-excluded portion: 28% (effective blended rate: 14%)

Holding period: 4 years → Exclusion: 75% → Tax rate on the non-excluded portion: 28% (effective blended rate: 7%)

Holding period: 5 years → Exclusion: 100% → Tax rate on the non-excluded portion: 0%

Stock acquired on or before July 4, 2025 still follows the old rule: a full five-year hold for any exclusion at all, no partial credit at three or four years. Stock acquired after that date follows the new tiered rule above. The same founder can easily hold both kinds, exercised months apart, and owe a completely different tax bill on each.

The other changes matter too: the per-issuer exclusion cap rose from $10 million to $15 million (or 10x basis, whichever is greater), and the company-level gross asset threshold rose from $50 million to $75 million, but only for stock issued after the same July 4, 2025 cutoff. A company that raised past $50 million in gross assets before that date may have already priced older grants out of QSBS entirely, even if it's comfortably under $75 million today.

Build a tranche-level tracker, not one holding-period date

A single QSBS eligible: yes or no field in your records isn't enough anymore. Track it at the tranche level instead:

1. List every exercise event separately. Use the exercise date, not the grant date, as the clock-start for each batch of option shares.
2. Flag pre- versus post-July 4, 2025 acquisition on every tranche. This single flag determines which rule set applies, old flat five-year or new tiered.
3. Calculate three maturity dates per post-cutoff tranche: the three-year, four-year, and five-year marks, not just one.
4. Log the company's gross assets at each issuance date. If the company crossed $50 million (pre-cutoff shares) or $75 million (post-cutoff shares) before a given tranche was issued, that tranche likely never qualified.
5. Watch for retroactive disqualification events: large share buybacks, a shift into an excluded business activity, or holding too much cash in non-operating investments can strip QSBS status from shares that already met every other test.

A simple spreadsheet with columns for grant date, exercise date, pre/post-cutoff flag, and the three tier dates will catch most of this. The point isn't sophistication, it's making sure nobody is relying on a single mental five-years countdown that was already wrong.

Where the tools still fall short

Cap table platforms have started offering QSBS attestation, an annual letter confirming company-level QSB status. That's useful and worth requesting every year, not just once. But attestation typically confirms the company still qualifies as a small business; it doesn't always tell an individual shareholder which of their specific tranches has crossed which of the three new tiers, especially since the tiered rule itself is barely a year old and most tooling was built around the old single cliff.

As one equity policy lead at a major cap table provider put it in a webinar on this exact issue: founders get tripped up when a company issues a grant while under the asset threshold, the employee sits on it unexercised, and by the time they exercise, the company has grown past the limit and the grant never qualified in the first place. Attestation catches that at the company level. It won't catch it at the level of which of your 37 exercise dates this applies to unless you're asking that question yourself.

What to do this week

Pull your full exercise history, not your grant history, and build the tranche-level spreadsheet above. Flag anything exercised after July 4, 2025, since that's the group actually eligible for the new 50% and 75% tiers. Then send the sheet to a tax advisor who has specifically worked through OBBBA's Section 1202 changes, not just general QSBS, before you assume any exclusion percentage on a real transaction.

Frequently asked questions

When does the QSBS holding period actually start for stock options?

On the exercise date, when you actually receive shares, not on the date the options were granted. Unexercised options don't accrue any QSBS holding time.

Do the new 3-year and 4-year exclusions apply to stock I already hold?

Only if you acquired it after July 4, 2025. Stock acquired on or before that date still needs a full five-year hold to get any exclusion.

What happens if I sell before hitting a tier?

You get 0% exclusion on that tranche and pay standard capital gains rates on the full gain. There's no partial credit below the three-year mark.

Can my cap table software track this automatically?

Some platforms offer company-level QSBS attestation, which is worth requesting annually, but it may not break out tier eligibility per individual tranche, especially given how new the tiered rule is. Verify manually until you've confirmed your platform does.

What can disqualify QSBS after it's already been issued?

Large share buybacks around the issuance date, the company shifting into an excluded business activity, or holding too much cash in non-operating investments for an extended period can all strip eligibility retroactively.

Does the $75 million asset threshold apply to all my shares?

No. It only applies to shares issued after July 4, 2025. Earlier shares are still tested against the old $50 million threshold at the time they were issued.