What is Capital Gains Indexation Calculator?
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Capital gains indexation is a method of adjusting the purchase cost of a capital asset (particularly immovable property like land and buildings) for inflation, using the government-notified Cost Inflation Index (CII), to arrive at the 'indexed cost of acquisition.' This indexed cost is then used to compute Long Term Capital Gains (LTCG) — the difference between the sale price and the inflation-adjusted purchase cost. By accounting for inflation, indexation reduces the taxable capital gain, thereby reducing the tax liability. The Central Board of Direct Taxes (CBDT) notifies the CII for each financial year, with FY 2001-02 as the base year (CII = 100). For example, the CII for FY 2024-25 is 363. If you purchased a property for ₹30 lakh in FY 2004-05 (CII = 113) and sell it in FY 2024-25 (CII = 363), the indexed cost = ₹30L × (363/113) = ₹96.37 lakh — dramatically higher than the actual purchase cost. LTCG tax of 20% is then applied only on the difference between the sale price and this indexed cost. Important: Budget 2024 (effective July 23, 2024) fundamentally changed indexation for property: from July 23, 2024 onwards, property sellers have the option to pay LTCG tax at 12.5% without indexation OR continue with 20% with indexation (for properties acquired before July 23, 2024). Taxpayers should choose whichever option results in lower tax. For debt mutual funds (LTCG with >36 months holding), indexation was removed in Budget 2023 — debt MF gains are now taxed at slab rate without indexation.
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Formula
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Indexed Cost of Acquisition = Actual Cost × (CII of Year of Sale / CII of Year of Purchase); LTCG = Sale Price - Indexed Cost; LTCG Tax = LTCG × 20% (with indexation) OR Sale Price - Actual Cost × 12.5% (without indexation, post Jul 23 2024); Choose whichever is lowerVariable Legend
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| Symbol | Name | Unit | Description |
|---|---|---|---|
| CII_s | CII of Sale Year | number | Cost Inflation Index notified by CBDT for the financial year in which the property is sold (e.g., 363 for FY 2024-25). |
| CII_p | CII of Purchase Year | number | Cost Inflation Index for the year the property was purchased; if before 2001-02, use FMV on April 1, 2001 with CII=100. |
| AC | Actual Cost of Acquisition | ₹ | Total purchase price including stamp duty, registration charges, brokerage, and legal fees paid at the time of purchase. |
| IC | Indexed Cost | ₹ | AC × (CII_s / CII_p) — inflation-adjusted cost used for LTCG computation. |
How to Capital Gains Indexation Calculator
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- 1Identify the financial year of purchase and sale of the capital asset — for property, this is the date of registration; note that if the property was inherited or gifted, the previous owner's purchase date and cost (before April 1, 2001 adjusted to FMV as on April 1, 2001) applies.
- 2Look up the Cost Inflation Index (CII) for both the year of purchase and year of sale from CBDT's official notification — FY 2001-02 = 100 (base year); if purchased before FY 2001-02, use the FMV as on April 1, 2001 as the cost, and CII of that year as 100.
- 3Compute indexed cost: Actual Purchase Cost × (CII of sale year / CII of purchase year) — this is the inflation-adjusted cost basis.
- 4Add any improvement costs incurred after the purchase (capital improvements like extensions, renovations) to the cost — improvements also get indexed from their year of incurrence; stamp duty and registration costs are part of purchase cost.
- 5Compute LTCG with indexation = Sale Price − Indexed Cost of Acquisition − Indexed Cost of Improvement; LTCG tax = 20% on this amount.
- 6For property sold on or after July 23, 2024: also compute LTCG without indexation = Sale Price − Actual Cost; tax = 12.5%; compare both and choose the option with lower tax liability.
- 7Check exemptions: if you reinvest LTCG in a new residential property (Section 54), bonds (Section 54EC), or new assets within specified timelines, you can claim exemption on LTCG and reduce or eliminate the tax.
Worked Examples
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For pre-July 23, 2024 property: 20% with indexation is better here; always compare both options
With indexation: tax = ₹10.73L. Without indexation: 12.5% × ₹1.2Cr = ₹15L. The 20% with indexation option saves ₹4.27L because the indexed cost (₹96.37L) nearly triples the nominal purchase cost (₹30L), dramatically reducing the taxable gain.
For more recently purchased properties, the 12.5% without indexation option post-Budget 2024 often wins
With only 5 years of purchase history, indexation provides modest benefit (₹80L → ₹1,00.5L indexed). The 12.5% option on ₹70L LTCG = ₹8.75L is cheaper than 20% on ₹49.5L = ₹9.9L. Budget 2024 change helps sellers of recently purchased properties.
For pre-2001 properties, FMV on April 1, 2001 is the cost basis; can use registered valuer's report
Properties purchased before April 1, 2001 use the Fair Market Value (FMV) as on April 1, 2001 as the cost. This FMV is indexed using CII from that base year. A registered government-approved valuer's certificate is recommended to justify the FMV used.
Section 54 exemption requires purchase of ONE new residential house in India within 1 year before or 2 years after sale (3 years if constructing)
Section 54 provides complete LTCG exemption if the entire LTCG is reinvested in purchasing or constructing a new residential property within the stipulated timeline. If only partial reinvestment, proportional exemption applies. The new property must be in India and cannot be sold within 3 years.
Real-World Applications
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Property sellers computing LTCG tax before deciding whether to sell — comparing the tax under 20% with indexation vs 12.5% without indexation post-July 23, 2024, enabling practitioners to make well-informed quantitative decisions based on validated computational methods and industry-standard approaches
Tax planning for inherited property — computing indexed cost using FMV on April 1, 2001 to minimise LTCG tax on ancestral property sales, helping analysts produce accurate results that support strategic planning, resource allocation, and performance benchmarking across organizations
Chartered accountants computing capital gains for clients and advising on Section 54/54EC reinvestment strategies to reduce or eliminate LTCG tax, allowing professionals to quantify outcomes systematically and compare scenarios using reliable mathematical frameworks and established formulas
Real estate investors deciding whether to sell and reinvest (using CGAS) or hold — comparing the tax cost of selling now versus holding for another few years, supporting data-driven evaluation processes where numerical precision is essential for compliance, reporting, and optimization objectives
NRIs selling property in India — understanding the LTCG computation, TDS obligations on the buyer (20.8% withholding on total proceeds unless lower withholding certificate obtained), and DTAA benefits, which requires precise quantitative analysis to support evidence-based decisions, strategic resource allocation, and performance optimization across diverse organizational contexts and professional disciplines
Special Cases
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Property Acquired via Will/Inheritance
For inherited property, the date of acquisition and cost of the previous owner is considered. If the previous owner purchased before April 1, 2001, the FMV as on April 1, 2001 is the cost (with CII from 2001-02 = 100). The heir cannot claim exemption on LTCG using Section 54F (for self) if they already own two residential houses — they must check their eligibility based on their own ownership status, not the deceased's.
Undivided Family Property (HUF)
When joint family property (HUF property) is partitioned and individual shares are then sold, the cost of acquisition for LTCG is the individual's share in the original HUF cost. The holding period for LTCG includes the period the property was held by the HUF — not just from the partition date. This can significantly benefit members who received their share from a very old HUF property.
LTCG Reinvestment in Capital Gains Account Scheme
If you plan to reinvest LTCG in a new property under Section 54 but cannot complete the purchase before the ITR filing due date, you must deposit the unused LTCG amount in the Capital Gains Account Scheme (CGAS) at any nationalised bank before filing the ITR. This preserves the exemption claim. The funds must be used within the specified timeline (2 years for purchase, 3 years for construction) — otherwise the deposited amount becomes taxable as capital gains.
Joint Property — Splitting LTCG
For jointly owned property (spouses, siblings), the LTCG is split in proportion to ownership. Each co-owner independently computes their indexed cost, LTCG, and exemption claims. This allows each co-owner to utilise their own Section 54/54EC exemption limit (₹50L for 54EC) and their own ₹10 crore limit for Section 54. Proper documentation of ownership share at the time of purchase is essential.
Cost Inflation Index (CII) — Selected Financial Years
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| Financial Year | CII | Financial Year | CII |
|---|---|---|---|
| 2001-02 (Base) | 100 | 2013-14 | 220 |
| 2004-05 | 113 | 2016-17 | 264 |
| 2007-08 | 129 | 2019-20 | 289 |
| 2010-11 | 167 | 2021-22 | 317 |
| 2011-12 | 184 | 2022-23 | 331 |
| 2012-13 | 200 | 2023-24 | 348 |
| — | — | 2024-25 | 363 |
Frequently Asked Questions
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What is the Cost Inflation Index (CII) for FY 2024-25?
The Cost Inflation Index (CII) for FY 2024-25 is 363, as notified by CBDT. The base year is FY 2001-02 (CII = 100). The CII has increased from 100 in 2001-02 to 363 in 2024-25 — reflecting approximately 3.6x cumulative inflation over 23 years. The CII is used to compute indexed cost of acquisition for LTCG on capital assets held for more than 24 months (property) or 36 months (debt mutual funds).
How has Budget 2024 changed the indexation rules for property?
Budget 2024 (effective July 23, 2024) changed the default LTCG rate for immovable property from 20% with indexation to 12.5% without indexation. However, a special provision allows taxpayers to choose: for property acquired before July 23, 2024, you can opt for EITHER 20% with indexation OR 12.5% without indexation — whichever results in lower tax. For property acquired on or after July 23, 2024, only the 12.5% rate without indexation applies. This is a significant change for long-term property holders.
Can I claim exemption on LTCG from property sale?
Yes. Several exemptions allow you to reduce or eliminate LTCG tax: Section 54 (reinvest in new residential property within 1-2 years — up to ₹10 crore); Section 54F (for sale of non-residential capital assets, reinvest net consideration in residential property); Section 54EC (invest LTCG up to ₹50 lakh in specified bonds — NHAI, REC — within 6 months; 5-year lock-in); Section 54B (agricultural land, reinvest in agricultural land); Section 54GB (startup investments). Each has specific conditions and timelines.
What is the holding period for LTCG on property?
For immovable property (land, buildings), the holding period for LTCG is more than 24 months (2 years). Property held for 24 months or less qualifies as Short Term Capital Assets and STCG is taxed at slab rate. For listed equity, the threshold is 12 months. For debt mutual funds, it was previously 36 months for LTCG (with indexation), but since Budget 2023, all debt MF gains are taxed at slab rate regardless of holding period.
How do I determine the FMV of property purchased before April 1, 2001?
The FMV as on April 1, 2001 can be determined using: (1) A certificate from a registered government-approved valuer — this is the most defensible method; (2) Municipal valuation as of April 1, 2001; (3) Comparable sales data for similar properties in the same locality around that date. The CBDT specifies that the value should be as registered valuer's report, and the FMV cannot exceed the actual sale price. A professional valuation is strongly recommended to avoid Income Tax scrutiny.
Is stamp duty paid on purchase included in the cost of acquisition?
Yes. The cost of acquisition for capital gains purposes includes: actual purchase price, stamp duty paid, registration charges, legal fees for property purchase, and any other costs directly incurred for acquiring the property. These costs are also eligible for indexation from the year they were paid. Including all these costs in the indexed cost computation reduces the taxable LTCG.
What happens if the indexed cost exceeds the sale price?
If the indexed cost of acquisition exceeds the sale price (creating a loss), it is a Long Term Capital Loss (LTCL). LTCL can be carried forward for 8 years and set off only against LTCG from any capital asset (not against STCG or income from other sources). You must file your ITR before the due date to be eligible to carry forward this loss.
What is Section 54EC (Capital Gains Bonds) exemption?
Section 54EC allows exemption from LTCG on property by investing the capital gains (up to ₹50 lakh per financial year) in specified long-term bonds issued by NHAI (National Highways Authority of India) or REC (Rural Electrification Corporation) within 6 months of the sale date. These bonds have a 5-year lock-in period and earn interest at approximately 5-5.5% (taxable). This is useful when you don't want to buy property but want to save LTCG tax.
Common Mistakes to Avoid
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- !Not using the FMV as on April 1, 2001 for properties purchased before 2001 — using the original purchase price (e.g., ₹2 lakh for a 1985 purchase) instead of the much higher 2001 FMV significantly inflates the LTCG and tax.
- !Forgetting to index improvement costs — renovation, construction additions, and major repairs after the original purchase also get indexed from their year; not including these increases the taxable LTCG unnecessarily.
- !Missing the 6-month deadline for Section 54EC bond investment — the 6-month clock starts from the date of transfer, not the date of receiving money; missing this deadline makes LTCG fully taxable.
- !Not comparing the 20% with indexation vs 12.5% without indexation option for property sold after July 23, 2024 — the better option depends on your specific purchase date and cost; always calculate both.
- !Claiming Section 54 exemption on a second property sale — Section 54 only allows exemption on buying ONE new residential property; you cannot buy two houses and claim full exemption (though ₹2 crore LTCG can be split between two houses from FY 2019-20).
- !Not reporting LTCG from property sale in ITR because 'the buyer paid stamp duty' — LTCG from property sale must be reported by the seller regardless of stamp duty payment; buyers' TDS deducted (if price > ₹50L) appears as credit in seller's Form 26AS.
Pro Tip
For properties held for more than 10 years, the 20% with indexation rate almost always produces lower LTCG tax than 12.5% without indexation — because long holding periods allow CII to dramatically inflate the cost base, often reducing taxable LTCG to near zero. For properties held for 3-5 years, run the numbers both ways — the 12.5% option may be better because the indexed cost increase is modest.
Did you know?
India's Cost Inflation Index has risen from 100 in FY 2001-02 to 363 in FY 2024-25 — a 263% increase over 23 years, implying an average annual inflation of approximately 5.8%. For someone who bought property in 2001-02 and sells in 2024-25, the indexed cost is 3.63 times the original purchase price — meaning only appreciation above 3.63x is taxable as LTCG. This generous indexation benefit has shielded real estate investors from significant tax on what is partly just inflationary price increase.
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