Indexed Cost of Acquisition explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
The indexed cost of acquisition adjusts what you originally paid for an asset for inflation, using the Cost Inflation Index, to lower your long-term capital gain.
The formula
Indexed cost of acquisition = original cost × (CII of the year of sale ÷ CII of the year of purchase).
Example
If you bought an asset for ₹10 lakh and the CII has, say, doubled between purchase and sale, the indexed cost becomes about ₹20 lakh — so only the gain over ₹20 lakh (not ₹10 lakh) is taxed.
When it applies
- Applies to long-term capital assets eligible for indexation
- Not available for short-term gains
- Reduces the taxable long-term gain and hence the tax
Frequently Asked Questions
What is indexed cost of acquisition?
The original cost adjusted for inflation using the CII, to reduce the taxable long-term gain.
What is the indexation formula?
Original cost × (CII of sale year ÷ CII of purchase year).
Does indexation apply to short-term gains?
No — indexation applies only to eligible long-term capital assets.
Why is indexed cost important?
It lowers the taxable long-term capital gain and therefore the tax.
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Talk to an expert →Key Facts About Indexed Cost of Acquisition
- Applies in: All states across India, under the relevant central law.
- Mode: Mostly online via the official government portal.
- Typical timeline: Ranges from a few days to a few weeks depending on the case.
- Non-compliance: May attract penalties, interest or late fees.
- Expert help: TaxClue completes the entire process end to end for you.
What is indexed cost of acquisition?
The original cost adjusted for inflation using the CII, to reduce the taxable long-term gain.
What is the indexation formula?
Original cost × (CII of sale year ÷ CII of purchase year).
Over 90% of compliance penalties in India arise from missed due dates — timely handling can save businesses thousands of rupees each year.
Indexed Cost of Acquisition: a key compliance topic in Indian tax and corporate law that businesses and individuals must understand to remain compliant.
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Why This Matters
Staying compliant with Indian regulations protects your business from penalties, interest and unnecessary legal trouble. It is always wise to maintain proper records and documentation so that any future scrutiny can be handled smoothly. Rules and thresholds in capital gains are revised periodically, so it helps to review your obligations at the start of each financial year. Professional guidance from a qualified CA, CS or advocate ensures that filings are accurate and submitted well before the due date.
Small businesses and startups especially benefit from setting up a simple compliance calendar to track recurring deadlines. Government portals now allow most applications and filings to be completed online, reducing paperwork and turnaround time. Keeping your PAN, registration certificates and board resolutions organised makes every subsequent filing faster. When in doubt, it is better to seek clarification early rather than risk a notice or a late-filing penalty later.
A clear understanding of the applicable law helps you make confident, well-informed business decisions. TaxClue's experts regularly assist businesses across India with end-to-end capital gains support at transparent, affordable pricing. Timely compliance also improves your credibility with banks, investors and government authorities. Reviewing your obligations with a professional at least once a year keeps your business audit-ready and stress-free.
Staying compliant with Indian regulations protects your business from penalties, interest and unnecessary legal trouble. It is always wise to maintain proper records and documentation so that any future scrutiny can be handled smoothly. Rules and thresholds in capital gains are revised periodically, so it helps to review your obligations at the start of each financial year. Professional guidance from a qualified CA, CS or advocate ensures that filings are accurate and submitted well before the due date.
Small businesses and startups especially benefit from setting up a simple compliance calendar to track recurring deadlines. Government portals now allow most applications and filings to be completed online, reducing paperwork and turnaround time.