What the relief actually covers
Section 54 applies when you sell a long-term residential house and put the gain into another residential house. It is the gain that has to be reinvested, not the whole sale price, so if you put an amount at least equal to the gain into the new house, the entire long-term gain escapes tax; if you reinvest less, only that part is exempt and the rest is taxed.
The relief is for individuals and HUFs, and an NRI claims it on the same footing as a resident. The new house has to be a residential property, and the asset you sold has to have been held long enough to be long-term. It is the cleanest route for a seller who genuinely wants to move from one home to another rather than cash out.
The windows that decide everything
The exemption lives or dies on timing. You can buy the replacement house in a window that opens one year before the sale and closes two years after it. If instead you are building, the new house must be completed within three years of the sale.
| What you do | Deadline measured from the sale |
|---|---|
| Buy a ready house | One year before, up to two years after |
| Construct a house | Within three years |
A house bought more than a year ahead of the sale, or completed past the three-year construction window, does not qualify, and there is no discretion to stretch the dates. This is why the plan is fixed at the time of sale, not improvised afterwards.
When you haven't bought yet: the CGAS account
Sales and purchases rarely line up neatly, and your tax return falls due long before the two- or three-year windows close. The law bridges this with the Capital Gains Account Scheme. Any part of the gain you have not yet reinvested by the due date for filing your return must be deposited into a CGAS account with a bank, and that deposit counts as reinvestment, holding the exemption open.
You then draw from the CGAS account to pay for the new house within the buy or build window. Whatever is left unused in the account when the window closes becomes taxable in that later year. Missing the CGAS deposit deadline is one of the most common ways the exemption is lost. The gain was reinvestable, but it was sitting in an ordinary account when the return came due.
A worked example: Faisal upgrading in Bengaluru
Faisal, an NRI in Dubai, sells a Bengaluru flat in mid-2026 and makes a long-term gain of ninety lakh. He plans to buy a larger flat but has not found one by the time his return is due.
To hold the exemption, he deposits the ninety-lakh gain into a Capital Gains Account Scheme account before his filing due date. Eight months later he buys a flat for one crore, drawing the ninety lakh from the CGAS account and topping up the rest from his own funds. Because the full gain went into the new house within the two-year window, the entire ninety-lakh gain is exempt under Section 54.
Had he instead found a flat costing only sixty lakh, sixty lakh of the gain would be exempt and the remaining thirty lakh would be taxed as long-term gain. The ₹10 crore cap on counted reinvestment never bites here. It only matters where the new house is itself very large.
Section 54 or Section 54F: which one is yours
People mix these two up constantly, and the mix-up is expensive, because they ask for very different amounts of money. The deciding question is simple: what did you sell?
If you sold a residential house, you are on Section 54, and you only have to reinvest the gain. If you sold something else that was long-term. A plot of land, shares, gold, a commercial unit. You are on Section 54F, and you have to reinvest the whole net sale price, not just the gain, to get the full exemption. Reinvest only part of the sale price under 54F and only that proportion of the gain is exempt.
| Section 54 | Section 54F | |
|---|---|---|
| What you sold | A residential house | Any other long-term asset |
| What you reinvest | Only the gain | The whole net sale price |
| Other houses you may own | No restriction | Not more than one (besides the new one) |
| What you buy | A residential house in India | A residential house in India |
That house-ownership condition is the second trap. Under 54F, if you already own more than one other residential house on the date of sale, you cannot claim at all, so an NRI with several Indian properties is often pushed off 54F even when the maths would otherwise work.
When the clock starts and when it stops
The windows are only as reliable as the dates you anchor them to, and those dates are not always the ones you would assume.
The sale date. The date the whole window is measured from, is the date the property is transferred, usually the date the sale deed is executed and registered, not the date you received the money or signed an agreement to sell. For a ready house, the purchase counts from when the new sale deed is executed in your favour, so it is the registration that has to fall inside the one-year-before to two-year-after band, not merely a booking or token payment. For a house you are building, what matters is completion within three years of the sale. The construction has to be finished and the house fit to occupy inside that window, even if you started well before.
The practical lesson for an NRI buying off-plan: a builder's possession date that slips past the three-year mark can cost you the exemption, however early you paid. Pin the timeline to the documents, not to the brochure.
The ₹10 crore ceiling on the new house
For sales from AY 2024-25 onward, there is a cap on how much of the new house counts towards the exemption: ₹10 crore. If the replacement house costs more than that, only ₹10 crore of its cost is recognised. The gain attributable to spending above ₹10 crore is taxed.
In plain terms: the exemption is still the smaller of your capital gain or what the new house cost, except the new house's cost is treated as no more than ₹10 crore when that figure is worked out. For the overwhelming majority of sellers it never bites, because few are reinvesting more than ten crore into a single home. It matters for a high-value sale rolled into a very large house, and it applies the same way to Section 54 and to Section 54F. The same ₹10 crore ceiling also caps the amount you can usefully hold in a Capital Gains Account Scheme deposit for this purpose.
The house has to be in India, and the rare two-house option
This is the rule that catches NRIs hardest. The replacement house must be in India. Reinvesting your Indian house-sale gain into a home abroad, in Dubai, London, Toronto, wherever you actually live, does not qualify for Section 54 (the law was put beyond doubt for purchases from April 2015). If buying again overseas is your real plan, this relief simply is not available, and the gain is taxed; the capital-gains bond route under Section 54EC may then be the better shelter.
There is one widening of Section 54 worth knowing. Normally the gain must go into a single house. But if your long-term gain is up to ₹2 crore, you may split it across two residential houses (both in India) and still claim the full exemption. This is a once-in-a-lifetime choice. You can use it for one sale only, ever, so it is held back for the sale where it does the most good rather than spent on the first that comes along.