Income Tax · Capital Gains
Cost Of Improvement In Capital Gain (India, 2026)
When you sell an asset like property, the capital gain is not just the sale price minus what you paid. You can also deduct the money you later spent improving the asset, which is the cost of improvement. This guide explains what counts as cost of improvement, what does not, how it is deducted, and the timing rules that decide how much of it actually reduces your tax.
- What it is: capital spending that adds to or alters an asset after you acquire it, such as an added floor or room.
- Not included: routine repairs, repainting and ordinary maintenance are revenue expenses, not cost of improvement.
- Effect: it is subtracted from the sale price (with cost of acquisition and transfer costs) to lower the taxable gain.
- Indexation: for long-term assets it could be indexed; the method for property changed after the 2024 Budget, so check your year.
- Pre-2001: improvements before 1 April 2001 are generally ignored when the 2001 fair market value is used as cost.
- Proof: keep contractor bills, payment records and approvals to support the claim.
01What cost of improvement means
Cost of improvement is capital spending you make on an asset after you acquire it, which adds to or alters the asset in a lasting way. Think of building an extra floor on a house, adding rooms, or a major structural addition. This spending is allowed as a deduction when you later sell the asset and work out the capital gain.
The idea is fair: you should be taxed on your real gain, so the law lets you add genuine capital improvements to your cost before comparing it against the sale price.
Improvement is capital, not upkeep
The test is whether the spend created something new or lasting in the asset, rather than simply keeping it in working order. A new wing on a building is improvement. Repainting, fixing a leak or replacing a broken fitting is maintenance, and maintenance is not cost of improvement.
02What counts, and what does not
The line between a capital improvement and routine repair decides whether you can deduct the spend. A simple way to see it:
| Usually cost of improvement | Usually not (routine or revenue) |
|---|---|
| Constructing an additional floor or room | Repainting or whitewashing |
| A major structural extension or addition | Fixing leaks, plumbing or wiring repairs |
| Permanent additions that enhance the asset | Replacing broken fittings or regular upkeep |
| Capital work that adds lasting value | Annual maintenance and small renewals |
Only the capital improvements on the left can be added to your cost when computing the gain. For property specifically, our calculator for capital gains tax on sale of property shows where this figure sits in the overall computation.
03How it reduces your capital gain
The capital gain on an asset is broadly the sale consideration, minus the cost of acquisition, minus the cost of improvement, minus allowed transfer expenses. So the cost of improvement is a direct subtraction that lowers your taxable gain.
For a long-term asset, both the cost of acquisition and the cost of improvement could historically be indexed using the Cost Inflation Index, which raised the deductible amount for inflation. The rules on indexation for property changed with the 2024 Budget, which introduced a lower tax rate without indexation and, for certain resident sellers of property acquired before a cut-off date, an option between methods. Which method helps you depends on your figures and the year of sale.
Because the right method can swing the tax, it is worth computing the gain both ways where an option exists. See our guide to the long-term capital gains tax rate for how the rate side interacts with this.
04The pre-April 2001 rule
There is an important timing rule. For assets acquired before 1 April 2001, the law generally lets you take the fair market value as on 1 April 2001 as the cost of acquisition. In line with that, any cost of improvement incurred before 1 April 2001 is normally ignored, because it is already reflected in that 2001 value.
In practice this means only improvements made on or after 1 April 2001 are separately deductible as cost of improvement. Improvements before that date are not added again. Confirm the cut-off and the fair-market-value option for your asset and year, as the framework can be refined by later law.
05Proof you need to keep
Cost of improvement is only as good as the evidence behind it. If the department queries your gain, you may be asked to show that the spend was capital and that it was actually incurred. Keep:
- Contractor bills and invoices for the construction or addition.
- Bank statements or payment records showing the money went out.
- Approved plans or municipal approvals for a major addition, where relevant.
- Dates, so you can place the spend correctly relative to the 1 April 2001 rule and work out indexation where it applies.
Vague or undocumented improvement claims are a common reason a capital gains computation is questioned, so good records matter more here than almost anywhere else in the return.
06How Claw Tax helps
Claw Tax and Accounts is an online tax, GST and accounting service for India that connects you with a verified chartered accountant at a fixed, published price, with a Claw reviewer checking every filing before it is submitted.
If you have a single asset, clear bills and a simple gain, you can compute it yourself and file on the portal. Help is worth it when you have several improvements over many years, a pre-2001 asset where the fair-market-value option is in play, or a choice of method after the 2024 changes that could change your tax materially.
With Claw Tax and Accounts, a verified chartered accountant works out the gain, decides what qualifies as cost of improvement, applies indexation or the newer method where it helps, and files the return at a fixed published price, with a Claw reviewer checking it first. This is not tax advice; a verified CA handles your specifics.
07Frequently asked questions
What is cost of improvement in capital gains?
It is capital expenditure you incur to add to or alter an asset after you acquire it, such as building an extra floor or a major extension. When you sell the asset, this cost is subtracted along with the cost of acquisition and transfer expenses to arrive at the taxable capital gain.
Are repairs and painting part of cost of improvement?
No. Routine repairs, repainting, fixing leaks and ordinary maintenance are revenue expenses that keep the asset in working order. They do not count as cost of improvement. Only lasting capital additions that enhance the asset qualify.
Can I index the cost of improvement?
For long-term assets, cost of improvement could historically be indexed using the Cost Inflation Index. The treatment for property changed with the 2024 Budget, which introduced a lower rate without indexation and, for certain resident sellers, an option between methods. Which route helps depends on your figures and the year of sale, so confirm the rule for your assessment year.
What about improvements made before April 2001?
For assets acquired before 1 April 2001, you can usually take the fair market value as on that date as the cost of acquisition, and any improvement made before that date is generally ignored because it is already reflected in the 2001 value. Only improvements on or after 1 April 2001 are separately deductible.
What proof do I need for cost of improvement?
Keep contractor bills and invoices, payment records such as bank statements, and any approved plans or municipal approvals for major additions. Also keep the dates, so the spend can be placed correctly against the April 2001 rule and indexed where it applies. Undocumented claims are a common reason a capital gains computation is questioned.
Does cost of improvement apply to assets other than property?
The concept applies to capital assets generally, but it is most relevant for property, where owners often make lasting additions. For assets like shares or mutual funds there is usually no separate improvement cost. The key test everywhere is whether the spend was a lasting capital addition rather than upkeep.