Stock options are the most confusing part of compensation. Most employees accepting them do not fully understand what they are signing, and most founders offering them cannot explain them without Googling. The result is disappointment on both sides, and sometimes real money lost.

Here is the plain-English explanation every early employee and small-business founder needs.

The core idea in one paragraph

A stock option is not stock. It is a right to buy stock in the future, at a price fixed today. If the company grows, that fixed price becomes a bargain. If the company does not grow, or goes under, the option is worth nothing. The gap between the fixed price (your "strike price") and the current value is your upside.

The 7 terms that matter

1. Strike price

The price you will pay to actually buy the stock when you exercise your option. Set at the time of grant. Always compared to the current "fair market value" to measure your upside.

2. Grant size

The total number of options you receive, usually expressed as a percentage of the company or a specific share count. "0.5% equity" sounds small but at scale is six or seven figures.

3. Vesting schedule

You don't get all options immediately. The standard is 4 years with a 1-year cliff. Translation: nothing for 12 months, then 25% at the one-year mark, then monthly thereafter until year 4.

The cliff exists so the company doesn't hand equity to a hire who leaves in 3 months. The 4 years exist to keep early employees long enough to matter.

4. Exercise window

How long you have to buy the stock after you leave the company. The default is 90 days, which is harsh. Some progressive companies extend it to 10 years, giving you until the company IPOs or gets acquired. Ask about this before you accept.

5. ISO vs NSO

ISO (Incentive Stock Option): Tax-advantaged, only for employees, comes with AMT complications at exercise.
NSO (Non-qualified Stock Option): Less tax-advantaged, simpler, can be granted to contractors and advisors.

6. 409A valuation

An independent appraisal of the company's fair market value, done annually. This sets the strike price. Early 409A valuations are low, which is good, you lock in a low price and benefit if the company grows.

7. Preferences and dilution

Investors get liquidation preferences, they get paid back first in an exit. Later rounds dilute existing shareholders. Your 0.5% today might be 0.3% by the time you exercise. This is normal but matters in small exits.

What early employees should ask before accepting

These are the questions most employees don't know to ask but should:

How many total shares are outstanding? (Percentage matters more than share count.)
What is the current 409A valuation?
What is the most recent preferred share price?
What is the exercise window after termination?
Is this ISO or NSO?
What happens to my options if the company gets acquired before I fully vest?
Can I early-exercise (exercise before fully vested)?
What is the total employee option pool and how much is left?

A founder who cannot answer these questions has not set up a real equity program, which is a red flag.

What founders should explain proactively

If you are offering equity, do not make candidates play 20 questions. Send every offer with:

A one-page plain-English explanation of how options work at your company
A sample calculation showing what the grant could be worth at different exit valuations
The exact vesting schedule
The 409A valuation and date
The option pool size and expected dilution

Transparency builds trust. Employees who understand their equity are less likely to feel burned later.

The math of "what it's worth"

Back-of-envelope calculation: If you have 10,000 options with a $1 strike price at a company with 1,000,000 shares outstanding, and the company is acquired for $50M, your options are worth roughly:

(10,000 × $50) − (10,000 × $1) = $490,000 before taxes

If the same company raises future rounds and dilutes you 20%, the math becomes:

(8,000 × $50) − (8,000 × $1) = $392,000

Not bad, but dramatically different. Always calculate scenarios, not promises.

Stock options vs cash

Employees trading cash for equity should understand: if the company fails, the equity is worth nothing. The right question is not "what could this be worth?" but "can I afford to bet this much of my compensation on this company's success?"

Most early employees should target equity at no more than 30% of expected total comp. Anything higher and you are betting the farm, which is fine if you believe, but should be a conscious choice.

Pair equity with strong cash offers

Equity is not a substitute for paying a competitive base salary. See salary benchmarking on a budget for cash targets, and HR budget planning for how to fit equity into your overall comp strategy.

Document everything

Every option grant needs a grant letter, a board approval, an option agreement, and a record in the cap table. TracefyHR stores each employee's offer letter, equity grant, and compensation history in one profile so the information is accessible at tax time or exit time. See how it works →

Stock Options for Early Employees: Explained in Plain English