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Stock Option Tax (ESOP) Calculator

Work out stock option tax (esop) instantly with clear inputs, formula shown and shareable results.

About Stock Option Tax (ESOP) Calculator

On exercise, the gap between fair value and exercise price is taxed as salary, whether or not you sell. The fair value then becomes your cost basis, so subsequent appreciation is taxed as a capital gain instead.

Formula

Option perquisite

Perquisite = (fair value - exercise price) × shares, taxed as salary at exercise

Worked example

With the default values below, Stock Option Tax (ESOP) Calculator returns Taxable Perquisite At Exercise of $700,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Exercise Price Per Shareminimum 0
100
Fair Value At Exerciseminimum 0
450
Number Of Sharesaccepts 1–10,000,000
2,000
Marginal Tax Rateaccepts 0–60 %
30 %

Results

Taxable Perquisite At Exercise
$700,000.00
Tax Due At Exercise
$210,000.00
Cash Needed To Exercise And Pay Tax
$410,000.00
Cost Basis For Future Capital Gains
$450.00

Step by step

  1. 1Values used
  2. 2Option perquisite
  3. 3Taxable Perquisite At Exercise= 700,000.00
  4. 4Tax Due At Exercise= 210,000.00
  5. 5Cash Needed To Exercise And Pay Tax= 410,000.00
  6. 6Cost Basis For Future Capital Gains= 450.00

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.
  • This is an estimate for general information and not professional financial, tax or legal advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Tax figures are estimates based on the rates, caps and thresholds you enter. Real rules differ by jurisdiction and change every year, and personal circumstances alter the outcome. This is not tax or financial advice — confirm with a qualified adviser.

Frequently Asked Questions

Why is tax due before selling?

Because the benefit crystallises on exercise. This is the classic cash-flow trap with unlisted shares.

What if the share price then falls?

You have already paid salary tax on the higher value, and the fall becomes a capital loss with limited offset.

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