Eligibility & tax planning

Rule 144 holding period: two clocks running at once.

When founders, executives, and early investors ask "how long do I have to hold before I can sell?", they often discover there are actually two separate holding-period questions with two different answers — and the one that controls the tax outcome is not the same one that controls whether the sale is legally permissible.

Getting both clocks right before the first share moves is the kind of planning a specialist can do in a single conversation. Getting it wrong can cost several percentage points on a seven-figure transaction.

Clock one: the Rule 144 safe harbor (when you can sell)

Rule 144 under the Securities Act of 1933¹ provides a safe harbor that lets holders of restricted or control securities resell shares into the public market without a registered offering. To use that safe harbor, you must satisfy a minimum holding period:

The 6-month period for reporting-company shares was shortened from one year in 2008 by SEC Release No. 33-8869.² If your shares are in a publicly listed company, the shorter rule almost certainly applies.

When does the Rule 144 clock start?

The holding period begins on the later of (a) the date you acquired the securities and (b) the date of any prior transaction that reset the clock. For shares purchased for cash, the clock starts on the settlement date. For shares received for services, it starts on the grant date. For options, it starts on the exercise date — not the grant date.

Tacking: borrowing a prior holder's period

In some cases you can "tack" a prior holder's period onto yours, shortening or eliminating your own wait. Tacking is generally permitted when:

• You received the shares as a gift — you may tack the donor's holding period.
• You inherited the shares — estate beneficiaries may tack the decedent's holding period.
• You acquired shares from a non-affiliate in a private transaction — you may tack the seller's period if they acquired for investment (not distribution).
• You received shares in a conversion or exchange for other securities of the same issuer — new shares generally tack from the original acquisition.

Tacking does not apply when you acquired shares from an affiliate, purchased on the open market, or received shares in a transaction that reset the holding period (such as a pledge and default that resulted in transfer).

Former affiliates: the 90-day look-back

If you are currently an affiliate of the issuer — or have been an affiliate within the past 90 days — you are subject to the full affiliate rules: current public information, volume limits, manner-of-sale requirements, and Form 144 filing.¹ Only after 90 days with no affiliate status do those additional conditions fall away. Former executives, retired directors, and sold-out founders with a departure date inside the 90-day window still need to comply.

Clock two: the LTCG holding period (how gains are taxed)

The Rule 144 holding period and the IRS long-term capital gains holding period are entirely separate concepts. Meeting Rule 144's 6-month requirement does not qualify you for long-term capital gains treatment. That requires a distinct 1-year holding period under IRC § 1222.

2026 federal long-term capital gains rates

The IRS inflation-adjusted thresholds for 2026 are:³

Net Investment Income Tax (NIIT)

High earners owe an additional 3.8% NIIT under IRC § 1411 on the lesser of (a) net investment income or (b) the amount by which MAGI exceeds $200,000 (single) or $250,000 (married filing jointly).⁴ These thresholds are fixed — not indexed for inflation — so most restricted-stock holders at the point of a meaningful sale will hit them.

Combined, a founder in the top bracket selling shares held more than one year faces 20% + 3.8% = 23.8% federal LTCG rate, plus state income tax. California, for example, taxes capital gains as ordinary income with a top rate above 13%.

How the two clocks interact

Most founders and long-tenured executives have held shares for years — both the 6-month Rule 144 period and the 1-year LTCG period are already satisfied when they first think about selling. But there are cases where the gap matters:

• Recent option exercises: ISOs or NQSOs exercised in the past year may satisfy Rule 144 (6 months from exercise) but not yet qualify for LTCG treatment (needs 12 months from exercise). Selling at month 7 is legally permissible under Rule 144 but produces short-term gains at ordinary rates.
• RSUs that vested recently: Same dynamic. Rule 144 may permit the sale; the tax clock may not have turned long-term yet.
• Post-IPO lockup expiration: The lockup ends (often 180 days post-IPO) around the same time as the Rule 144 6-month window. If shares were acquired near IPO pricing, the 1-year LTCG clock may not have run yet. A few weeks' patience can shift the tax rate by 20+ points.

Planning the sale around both clocks

Once both periods are satisfied, the financial planning layer kicks in: how much to sell, in which tax years, at what price triggers, and how to reinvest proceeds without creating a different concentration risk. A staged sale strategy — spreading sales across calendar years — can keep each year's recognized gain within the 15% bracket rather than pushing into the 20% tier or triggering NIIT on a large lump sum.

The volume limit calculator shows how many shares an affiliate can sell in a 3-month window. The Rule 144 sale checklist lists the operational gates that need to be ready before execution. And the restricted stock sale planning guide covers concentration targets, proceeds policy, and coordination with counsel and broker.