Giving up the old flat is a sale, even though no money changes hands
It does not feel like a sale — you are not selling to a buyer, you are giving your flat to a builder and getting a new one back. But for tax, an exchange is still a transfer of a capital asset (Section 2(47)). You have parted with the old flat; in return you receive a new flat and some cash. That swap can trigger capital gains, with the value of what you receive standing in for a sale price.
The gain is your consideration (the new flat's value, plus any cash) minus the cost of the old flat — and where the old flat was bought or inherited before 1 April 2001, that cost can be its 1 April 2001 fair-market value rather than the long-ago purchase price. So the same step-up that helps an ordinary old-property sale helps here too.
When the tax actually falls due — sign now, possibly pay later
The biggest worry is being taxed the moment the agreement is signed, years before the new flat exists. For an individual (or HUF) under a registered redevelopment or joint-development agreement, the law eases this. Section 45(5A) defers the capital gain to the year in which the building's completion certificate is issued — not the year you handed over the old flat. On that completion date, the stamp-duty value of your new flat, plus any cash you received, is treated as the consideration for the old one.
The timing is genuinely contested in practice. Tribunals have held that merely allowing a builder to construct is not, by itself, the point of transfer — the rights in the old flat have to actually pass. Where the agreement is unregistered, or the facts do not fit Section 45(5A), the gain can instead be tested under general principles, which often points to the year you get possession of the new flat. The safe approach is to read the actual agreement against these rules rather than assume a date.
| Your situation | When the gain is generally taxed |
|---|---|
| Registered agreement, individual | Year the completion certificate is issued (Section 45(5A)) |
| Unregistered / facts don't fit 45(5A) | Tested on general principles — often on possession of the new flat |
The new flat can shelter the gain — Section 54
Because what you receive back is itself a new residential house, the gain on giving up the old one can often be sheltered under Section 54 — the same relief that applies when you sell one home and buy another. The new flat received in the redevelopment stands in for the 'reinvestment', and tribunals have repeatedly allowed the Section 54 claim rather than denying it just because the route was redevelopment instead of a market purchase.
This is one of the more favourable parts of the picture for a flat owner, but it is fact-sensitive — it depends on the gain being long-term, on the new flat qualifying, and on the reinvestment being recognised within a reasonable period measured from when the gain is treated as arising. It is exactly the kind of position worth fixing in writing before the return is filed, not argued after a notice.
The corpus and the rent allowance — usually not income, but contested
Alongside the new flat, you typically receive two cash flows: a one-time corpus (a lump sum the developer pays the society's members) and a monthly rent or hardship/displacement allowance to cover living elsewhere during construction.
The prevailing view at the tribunals is that the corpus and the genuine hardship element are capital receipts — compensation for the inconvenience and displacement of giving up your home — and so are not taxed as ordinary income. The rent allowance is treated, on the same reasoning, as reimbursing the cost of substitute accommodation rather than as earnings. Where the allowance clearly exceeds what you actually spend on rent, the excess is more exposed to being taxed.
This is the genuinely litigated corner of redevelopment. The treatment turns on how the agreement is worded and what the payments are really for, and the department does sometimes try to tax these as 'income from other sources'. The position is defensible on the current ITAT trend, but it should be documented — what each payment is, and what it compensates — rather than simply left off the return.
A worked example: Kavita's Borivali flat
Kavita, an NRI in Toronto, owns a flat in Borivali, Mumbai, that her parents bought in 1992 and she inherited. The society signs a registered redevelopment agreement with a builder in 2026. Kavita will receive a larger new flat on completion, a corpus of twelve lakh, and forty thousand a month as rent allowance while the building comes up.
Because she is an individual under a registered agreement, the capital gain on giving up the old flat is not taxed in 2026. Under Section 45(5A) it is deferred to the year the completion certificate is issued. On that date the new flat's stamp-duty value — say one crore twenty lakh — plus any cash becomes her consideration; against it, the cost is the flat's 1 April 2001 fair-market value (carried from her parents under the inheritance rules), which a valuer fixes at, say, twenty-two lakh. Because she receives a new residential house, the resulting long-term gain can largely be sheltered under Section 54.
The twelve-lakh corpus and the hardship element of the rent allowance are, on the prevailing view, capital receipts and not taxed as her income — provided the agreement supports that and the rent broadly matches what she actually pays to live elsewhere. Any long-term gain that is not sheltered is taxed at the flat 12.5% NRI rate plus surcharge and cess. The figures move with the agreement and the valuation, which is why the date, the stamp-duty value and the corpus wording are each pinned down rather than assumed.