Stock Split & Bonus Cost Basis Calculator
Adjusted share count and per-share basis after a split or bonus issue — plus India's bonus-share zero-cost tax quirk.
Formula
Splits are cosmetic; bonus issues in India have a tax sting — bonus shares take zero cost basis and a fresh holding period, so selling them soon after allotment books 100% short-term gain. The 'bonus stripping' rule (§94(8)) also disallows engineered losses on the originals.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Need stock split & bonus cost basis calculator results fast? Analysts, founders, traders and finance professionals use the Stock Split & Bonus Cost Basis Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Stock Split & Bonus Cost Basis Calculator
Adjusted share count and per-share basis after a split or bonus issue — plus India's bonus-share zero-cost tax quirk. Splits are cosmetic; bonus issues in India have a tax sting — bonus shares take zero cost basis and a fresh holding period, so selling them soon after allotment books 100% short-term gain. The 'bonus stripping' rule (§94(8)) also disallows engineered losses on the originals. The governing relationship is split: basis ÷ ratio on all; bonus (India): originals keep basis, bonus shares = ₹0. The Stock Split & Bonus Cost Basis Calculator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use Stock Split & Bonus Cost Basis Calculator
- 1Enter Shares held, Original cost per share (currency), Corporate action, New shares per old (e.g. 2:1 → 2) into the Stock Split & Bonus Cost Basis Calculator.
- 2The result is computed automatically using split: basis ÷ ratio on all; bonus (India): originals keep basis, bonus shares = ₹0 — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Stock Split & Bonus Cost Basis Calculator?
- ✓Computes stock split & bonus cost basis calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the Stock Split & Bonus Cost Basis Calculator?+
Stock Split & Bonus Cost Basis Calculator uses split: basis ÷ ratio on all; bonus (India): originals keep basis, bonus shares = ₹0. Splits are cosmetic; bonus issues in India have a tax sting — bonus shares take zero cost basis and a fresh holding period, so selling them soon after allotment books 100% short-term gain. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Stock Split & Bonus Cost Basis Calculator need?+
Enter Shares held, Original cost per share (currency), Corporate action, New shares per old (e.g. 2:1 → 2) and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Stock Split & Bonus Cost Basis Calculator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the Stock Split & Bonus Cost Basis Calculator?+
The 'bonus stripping' rule (§94(8)) also disallows engineered losses on the originals.
What is the Stock Split & Bonus Cost Basis Calculator based on?+
The method follows authoritative sources: Income-tax Act §55(2)(aa) — bonus share cost; §94(8). The formula and references are shown on the page so you can verify and cite the result.
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