Bonus & Split Adjusted Return Calculator
Reconstruct a dated sequence of bonus issues, stock splits and consolidations, reconcile the shares actually credited and compare original cash invested with true ending wealth.
Learn the concept firstWhat Are Bonus Shares? Meaning, Ratio and Examples→On a small screen, swipe inside the chart to inspect every label.
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Performance basis is not a tax ledger. Bonus allotments and subdivided shares can have different acquisition-cost and holding-period rules. Keep broker and company records and use the Capital Gains Calculator for a sale lot.
This is an educational reconstruction for one original purchase followed by bonus issues, splits or consolidations. Additional purchases, partial sales, rights issues, mergers, demergers, taxes and dividend reinvestment require separate records.
Reconstruct the holding before you judge the return
A pre-bonus or pre-split purchase price is not directly comparable with today’s adjusted share price. Rebuild every corporate action in sequence, reconcile the quantity credited to demat, and only then compare original cash invested with ending wealth.
A clean four-step workflow
The calculator stays compact, but every step preserves the record an investor may need to verify later.
Enter the original purchase date, quantity and actual price paid.
Use the announced bonus ratio or old-to-new face values exactly.
Enter actual demat credits whenever the mathematical quantity was not credited as shown.
Add dividends, deduct selected charges and compare the full result with original cash invested.
New shares for existing shares
Factor = (New + Existing) ÷ ExistingA 1:1 bonus doubles the quantity. A 1:2 bonus changes 100 existing shares into an exact 150-share holding before fraction treatment.
Old face value to new face value
Factor = Old face value ÷ New face value₹10 to ₹2 is a 5× split. ₹2 to ₹10 is a 0.2× consolidation. The event filing remains the authority.
Why a falling share price can still hide a strong return
Suppose 100 shares were purchased at ₹1,000 each. A 1:1 bonus changes the holding to 200 shares, and a later ₹10-to-₹5 split changes it to 400. At ₹450 per adjusted share, the holding is worth ₹1,80,000 before dividends and charges.
Raw share price versus correctly adjusted return
This compares unlike per-share units and ignores the larger adjusted holding.
This compares original cash invested with all reconstructed shares at the current price.
Three records you must not mix
The calculator makes these distinctions visible so a useful performance number is not mistaken for a broker or tax record.
Mathematical fraction versus demat credit
A company may aggregate, sell, pay or otherwise settle fractions under its filing. The calculator shows the exact fraction and carries expected whole shares only until you enter the actual demat quantity.
Performance basis versus tax lots
Original investment divided by final shares is a performance-comparison basis. For Indian tax records, post-2001 bonus shares can carry nil acquisition cost, while subdivided or consolidated shares trace cost to the original holding.
Simple dividends versus dated return
Simple mode treats total dividend cash as part of ending wealth at valuation. Dated mode uses payment dates for an XIRR-style annualised result without assuming reinvestment.
Keep the evidence behind every reconstructed number
These records make the calculator useful for research while keeping the final ledger verifiable.
- Original contract note and purchase date
- Company and exchange corporate-action filings
- Demat transaction statement after each event
- Dividend payment dates and bank credits
- Broker capital-gains or tax-lot statement before sale
- Any fractional-entitlement settlement advice
Learn the event, then verify the arithmetic
Use each specialist page for the part of the decision it owns.
NSE publishes (A+B)÷B for bonus adjustments and A÷B for splits and consolidations.
Open NSE methodology ↗Review bonus-share holding periods, cost rules and treatment of subdivision or consolidation before a sale.
Open Income Tax guidance ↗Frequently asked questions
Why can I not compare the old purchase price directly with today’s price?
Bonus issues and stock splits increase the number of shares and reduce the comparable per-share cost. Comparing an original pre-action price directly with the current adjusted share price understates the return or can make a profitable holding appear to have lost money.
How do I enter a 1:1 bonus issue?
Choose Bonus issue, enter 1 under New shares and 1 under For existing shares. The factor is (1 + 1) divided by 1, so the eligible quantity doubles. A 1:2 bonus uses 1 new share for every 2 existing shares and produces a factor of 1.5.
How do I enter an Indian stock split from face value ₹10 to ₹2?
Choose Stock split, enter ₹10 as the old face value and ₹2 as the new face value. The factor is 10 divided by 2, so the expected share count multiplies by five while the performance-comparable entry price divides by five.
Can the calculator handle a reverse split or share consolidation?
Yes. Choose Share consolidation and enter the old and new face values. For example, ₹2 to ₹10 produces a factor of 0.2. The exact mathematical quantity, whole quantity and any fraction are shown separately.
Why does the next event use whole shares instead of the mathematical fraction?
A fractional entitlement is not automatically a demat share. The company filing may prescribe aggregation, sale proceeds, cash settlement or another method. The calculator therefore separates the fraction and carries expected whole shares until you enter the quantity actually credited.
When should I use the Actual shares credited field?
Use it after checking the demat transaction statement or company settlement advice. Once entered, that verified quantity becomes the starting share count for every later corporate action, preventing an earlier fraction or settlement difference from compounding through the timeline.
Is performance-adjusted entry price my tax cost per share?
No. It divides original cash invested by the final reconstructed holding for performance comparison. Indian tax-lot rules can treat post-2001 bonus shares as having nil acquisition cost, while subdivided or consolidated shares trace cost to the original holding. Use broker records and the Capital Gains Calculator for a sale lot.
What is the difference between Simple total and Dated dividends?
Simple total adds all entered dividend cash to ending wealth and shows a CAGR-equivalent result as if that cash were held until valuation. Dated dividends uses each payment date to calculate a cash-flow-timed XIRR-style annualised return without assuming reinvestment.
Can I use this calculator after additional purchases or partial sales?
Not for a final portfolio return. This tool reconstructs one original purchase followed by bonus issues, splits or consolidations. Additional purchases, partial sales, rights subscriptions, mergers or demergers create separate cash flows or tax lots and should be handled through complete records and, where relevant, the XIRR Calculator.