Secondary-Market Tax Treatment: Long-Term vs Short-Term Holding Periods

You exercised ISOs on October 4, 2024. A secondary buyer makes an offer on September 20, 2025. Selling that day makes this a disqualifying disposition: you miss the ISO 2+1 holding period by 14 days. The tax difference between selling September 20 and waiting until October 5 is the gap between short-term ordinary-income treatment and long-term capital gain treatment, which on a $400,000 sale in California is roughly $80,000.

Holding periods determine the tax rate on secondary sales more than almost any other variable. Get them right and you save 15-25 percentage points on the effective tax rate. Get them wrong (by selling a few weeks too early or mismanaging grant vs exercise dates) and you hand that money to federal and state tax authorities.

This guide walks through the holding-period rules for ISOs, NSOs, early-exercised shares, and RSU-origin shares, plus the state-tax wrinkles that change the answer.

The core holding-period rules

Long-term capital gain

Required holding: more than one year from the date of tax basis establishment. Federal rate: 0%, 15%, or 20% depending on income band. Plus 3.8% Net Investment Income Tax if AGI exceeds the threshold ($200k single, $250k married filing jointly for 2025).

Top federal rate on LTCG: 23.8%.

Short-term capital gain

Holding one year or less from basis establishment. Taxed at ordinary income rates up to 37% federal plus NIIT plus state. Total can exceed 50% in high-tax states.

Ordinary compensation income (disqualifying dispositions, NSO spread)

Treated as W-2 wages, subject to ordinary income tax, Medicare, and Social Security (up to the wage base). Rates same as short-term capital gain but reported differently.

Holding period mechanics by grant type

ISOs held through the 2+1 rule

A qualifying ISO disposition requires the shares to be held:

More than 2 years from the grant date, AND
More than 1 year from the exercise date

Both conditions must be met. Miss either and it is a disqualifying disposition.

When met: entire gain is long-term capital gain. Basis is the strike price paid at exercise. If you exercised 5,000 shares at $4 strike and sell at $40, gain is $36 × 5,000 = $180,000 taxed at 23.8% federal (plus state).

ISOs sold before 2+1 (disqualifying disposition)

Disqualifying disposition creates ordinary income on the bargain element (409A at exercise minus strike, up to sale price) and capital gain on any further appreciation. Holding period for the capital-gain piece runs from exercise date.

Example: exercised at $4 with 409A of $18. Bargain element $14 × shares. Sold 10 months later at $40. $14 × shares is ordinary income. $22 × shares ($40 - $18) is short-term capital gain because sold within 12 months of exercise.

The ordinary income piece is reported on a corrected W-2 by the employer, not on your individual tax return’s capital-gain schedule.

NSOs

Taxable at exercise: ordinary income equal to 409A minus strike times shares. Basis becomes 409A at exercise. Holding period for subsequent sale runs from exercise date.

Sell NSO-exercised shares more than 12 months after exercise: long-term capital gain on appreciation above 409A-at-exercise. Sell within 12 months: short-term.

Early-exercised ISOs and NSOs with §83(b) election

If you early-exercise unvested options and file §83(b) within 30 days, the holding period starts on the exercise date. For ISOs, the 2+1 clock runs from that date regardless of vesting. For NSOs, the ordinary income is recognized at exercise (usually minimal spread) and the capital-gain clock starts.

Early exercise plus §83(b) is the cleanest way to start long-term and QSBS clocks early.

Early-exercised without §83(b)

Without §83(b), unvested shares are treated as acquired when they vest, not when exercised. Holding period starts at vesting. This defeats the purpose of early exercise.

Always file §83(b) within 30 days of early exercise or do not early-exercise.

Shares from RSU settlement

RSUs are taxed as ordinary income at settlement (the settlement FMV is reported on W-2). Basis becomes the settlement FMV. Holding period for subsequent capital-gain treatment runs from settlement date.

Double-trigger RSUs settle at the liquidity event. If the liquidity event is March 15, 2026 and you sell on March 16, 2027, you have just crossed the one-year mark and qualify for LTCG.

State-level complications

California

California taxes capital gains as ordinary income. No preferential LTCG rate. Top rate 13.3%. The federal holding-period distinction still matters because California conforms to federal rules for characterizing the gain.

New York

Capital gains taxed as ordinary income. Top state rate 10.9% (plus NYC 3.876% for residents).

Texas, Florida, Washington, Tennessee, Nevada

No state income tax. LTCG / STCG distinction is purely a federal calculation.

Washington state

Capital gains excise tax of 7% on long-term gains above $250,000 as of 2025 (surviving legal challenges). Does not apply to wage income, so ordinary-characterization gains on disqualifying dispositions are free from this.

California trailing nexus

If you earned the equity while a California resident but moved to a no-tax state before sale, California may still tax the gain under its deferred compensation rules. See the California trailing nexus article for details.

The “2+1 timing trap” example

An ISO exercised today locks in a disqualifying disposition unless held 12 more months (and 2 years from grant). The trap is tendering during a tender offer window that happens to fall inside the 1-year window post-exercise.

Example timeline:

Grant date: January 15, 2024
Exercise date: October 15, 2024
Tender offer announced: September 1, 2025
Tender window closes: September 25, 2025

If you exercise October 15, 2024 and tender shares on September 25, 2025, that is 11 months and 10 days after exercise. Disqualifying disposition. Ordinary income on bargain element, short-term capital gain on residual.

Waiting until October 16, 2025 (past the 1-year exercise mark) converts the tax treatment to favorable. A 21-day delay saves potentially 25 percentage points on the tax bill.

Path	Tax treatment	Effective rate (CA, top bracket)
Tender Sep 25, 2025	Disqualifying: ordinary on bargain element, short-term on residual	52%
Tender Oct 16, 2025	Disqualifying still (under 2 years from grant): bargain element still ordinary	52% on bargain element, 23.8% + 13.3% on appreciation above 409A
Tender Jan 16, 2026 (2+1 met)	Qualifying: entire gain LTCG	23.8% + 13.3% (CA) = 37.1%

Note: the 2+1 rule requires both conditions. Just waiting past the 1-year exercise date is not enough if the 2-year grant date has not passed.

When tenders or secondary windows force the decision

Tender offers usually open on a company’s schedule, not yours. If the tender falls before your 2+1 mark, you have three choices:

Tender and accept disqualifying disposition tax cost.
Do not tender and wait for a later liquidity event.
Tender a smaller amount (just the shares where the 2+1 is already met or not relevant).

For companies running annual or semi-annual tenders, waiting until the next window is often the right call if 2+1 maturity is close.

QSBS holding period on top of LTCG

QSBS under IRC §1202 requires a 5-year holding period. LTCG qualification is a prerequisite (1 year), but QSBS adds 4 more years for full exclusion.

For ISOs exercised as QSBS-eligible shares, the 5-year clock usually runs from the exercise date (when you paid for the shares and took ownership). Note: some practitioners argue it runs from grant for certain structures. Check with a tax advisor on your specific fact pattern.

Miss the 5-year mark and you pay LTCG at 23.8% + state. Meet it and federal is zero on up to $10M or 10x basis.

Frequently asked

Does the 1-year LTCG clock pause during lockup?

No. The clock runs continuously from exercise date regardless of whether you can actually sell. If you exercise January 2025 and lockup ends March 2026, you already crossed the 1-year mark in January 2026.

Can I use tax-loss harvesting on short-term losses to offset?

Yes. Short-term capital losses offset short-term capital gains first. Long-term losses offset long-term gains first. Excess losses in either category can net against the other. Unused losses carry forward.

What if I sell some shares at LTCG and some at STCG?

You can specify which shares you are selling by lot identification. Most brokerages default to FIFO unless you instruct otherwise. Selecting specific lots lets you prioritize LTCG shares when partial sales are possible.

Does a wash sale apply to secondary sales?

Yes. Wash sale rules (§1091) apply to any sale at a loss where you acquire substantially identical stock within 30 days before or after. Relevant if you are selling at a loss and exercising new options in the same window.

Is there a way to accelerate the clock?

No. Holding periods are strictly calendar-based. The only lever is when you start the clock (exercise date, settlement date, or early-exercise date).

Next step

Before any secondary sale or tender participation, list each lot of shares you hold with its acquisition date, basis, and tax character (ISO, NSO, early-exercised, RSU-origin). Mark the holding-period status for each lot (LTCG eligible, STCG, pre-2+1, post-2+1). Sell from LTCG-qualified lots first whenever possible. If a tender forces sale of pre-2+1 lots, model the tax cost explicitly and make the decision with eyes open.