Vested vs Unvested Shares: Key Differences Explained

The table compares unvested and vested stock on what each is, who holds it, the legal and tax treatment, risk, when you can sell and a typical case.

A vesting schedule says how much of an award becomes yours, and when. A common pattern for startups is four years with a one-year cliff. Nothing vests during the first year. On the first anniversary, a quarter vests at once. The rest then vests monthly or quarterly.

Example: Leaving After 18 Months

An employee receives 4,800 RSUs on that schedule. At month 12, 1,200 units vest. After that, 100 vest each month. She leaves at month 18.

• Vested at the cliff1,200 units.
• Vested over the next six months600 units.
• Kept when she leaves1,800 units, 37.5% of the grant.
• Lost3,000 units, 62.5% of the grant.

Some awards need more than time. At many private companies, RSUs also wait for an IPO or a sale, called double-trigger vesting. Units can stay unvested for years after the time condition is met. Other awards vest faster when the company is sold, a feature covered in accelerated vesting.

Restricted Stock Units

An unvested RSU is only a promise of a share. When it vests, the company delivers the share, and its value that day is taxed as wages, per IRS Publication 5992. The RSU guide covers the details.

Some plans separate the two steps. An RSU vested but not distributed has met its conditions, but the share has not been delivered yet. Deferred units work this way, and the share arrives on a date or event the plan fixed in advance.

Restricted Stock

With restricted stock, the shares are issued to you on day one, but the company can take back the unvested part. Founders often hold shares this way, called reverse vesting. For tax, IRS Publication 525 treats unvested shares as still owned by the company. Dividends on them count as wages. The RSA vs RSU guide compares the two awards.

Stock Options

A vested option is a right you can now use: pay the strike price and receive shares. An unvested option cannot be exercised, unless the plan allows early exercise. Vesting itself is not taxed. Exercise is, and the rules depend on the type, as ISO vs NSO explains.

Vested vs Non-Vested in a 401(k)

The same words apply to retirement plans. Money you put into a 401(k) is always 100% vested. Matching money from your employer may vest on a schedule, according to the IRS. Non-vested amounts can be forfeited when you leave.

• Three-year cliffNothing vests in years 1 and 2. All of it vests after three years of service.
• Six-year graded20% after year 2, then 20 points more each year, reaching 100% after year 6.
• SEP and SIMPLE IRA plansEvery contribution is always 100% vested.

Under Section 83, property you receive for work is taxed once it is no longer subject to a substantial risk of forfeiture. That is the legal name for the condition that you keep working. When the risk lapses, the value minus anything you paid becomes wages. This is why RSUs and restricted stock are usually taxed at vesting.

For restricted shares, an 83(b) election moves the tax to the day you receive them. It must be filed within 30 days. If you later leave and lose the shares, you get no deduction for the tax already paid. RSUs cannot take the election, because nothing is issued until they vest.

Stock options work differently. Under IRS Topic 427, a non-qualified option is taxed when you exercise it, on the gap between the share value and the strike. An incentive option has no regular tax at exercise but can trigger the alternative minimum tax. See 83(b) election vs AMT for how the two meet.

Unvested Shares

For

Usually no tax yet. Shows the value you will earn by staying.

Against

Lost if you leave. Cannot be sold, pledged or exercised in most plans.

Verdict: unvested stock is a promise tied to your job. Count it when you weigh an offer, but do not count it as savings. Its value depends on staying and on the company.

Vested Shares

For

Yours to keep after you leave. Can be sold once there is a market. Options can be exercised.

Against

Tax may be due at vesting even if you cannot sell. Vested options can still expire if you do not act.

Verdict: vested stock is property you own, with the duties of an owner. At a private company, it may still be hard to sell. Track the tax it triggered and any deadline to exercise.

Before you resign, check the date of your next vesting event. A few weeks can decide whether a whole tranche, a block that vests on one date, is yours. Ask for your vesting statement and the plan’s exit rules in writing.

If you hold vested options, find your exercise window. An incentive option exercised more than three months after you leave is taxed as a non-qualified one. If your shares are private, vested shares are often eligible for an employee tender offer, while unvested ones are not. For awards that depend on company goals, see PSU vs RSU.

Common Mistakes

• Counting unvested stock as yoursIt is lost if you leave. Only the vested part goes with you.
• Missing the exercise windowVested options can expire soon after you leave. Read the plan.
• Forgetting tax at vestingRSUs and restricted stock are taxed as they vest, even if you cannot sell yet.
• Assuming double-trigger units have vestedAt many private companies, units wait for an IPO or a sale, however long you have worked.

Vested

Earned and yours to keep. For tax, no longer subject to a substantial risk of forfeiture.

Unvested

Still being earned. Usually lost if you leave before the vesting date.

Cliff

A first waiting period, often one year, before anything vests. A block vests when it ends.

Tranche

A block of an award that vests on one date.

Double-trigger vesting

Vesting that needs both time worked and an event, such as an IPO or a sale.

Substantial risk of forfeiture

A condition, such as staying employed, that must be met before property is fully yours for tax.

83(b) election

A filing within 30 days that taxes unvested restricted shares at their value when received.

Accelerated vesting

A clause that vests an award faster, often when the company is sold.

Every rule and figure was checked against the US Code and the IRS on November 6, 2026. They are US federal rules for tax year 2026. The vesting example is illustrative. Plans set their own schedules within these rules. State tax is not covered.