Two buyers in Bengaluru compared what looked like the same flat in early 2026, one in a tower still going up and one in a finished block next door, and could not understand why the finished one carried no goods and services tax while the under construction one added a slice to every instalment. Same builder, same layout, different tax. The answer was not a loophole but a rule that many buyers only half understand: GST turns on whether a flat is still under construction or is a completed property. Knowing where that line sits can change your total cost meaningfully.

The short answer. GST generally applies to an under construction flat but not to a ready flat that has a completion certificate or occupancy certificate, because a completed property is treated as goods rather than a supply of service. On under construction homes the rates that generally apply are one percent for affordable housing and five percent for other residential flats, both without input tax credit for the buyer. The trade-off to accept: these rates are settled in broad terms, but applicability and any change turn on specifics, so confirm the position for your exact purchase before you rely on a number.

Does a flat purchase attract GST?

Whether GST applies depends on one thing above all: is the flat still under construction or is it a completed property. GST is levied on the sale of an under construction flat, because that is treated as a supply of construction service. A ready flat that already has its completion or occupancy certificate is treated as a completed property, the sale of which does not attract GST. So the tax is not really about the flat itself but about its stage at the moment you buy it.

For a buyer, this is one of the clearest levers on the total cost of a home. Two otherwise similar flats can differ in price simply because one carries GST and the other does not, purely on account of construction stage. Understanding this before you compare options means you compare like with like, adding GST where it applies rather than being surprised by it after you have chosen. On a purchase running into many lakhs, that difference is not a rounding error but a real part of the price.

What are the GST rates on under construction flats?

For under construction residential flats, two headline rates generally apply, depending on whether the home is classed as affordable. Affordable housing generally attracts one percent, while other residential flats generally attract five percent, and in both cases the buyer does not get input tax credit. These rates are applied to the value of the under construction home, so on a large purchase even five percent is a meaningful sum to plan for.

Because the rates hinge on the affordable classification and on the property being under construction, a buyer should confirm which rate applies to a specific flat rather than assume. The general position has been stable, but the correct figure for your purchase depends on the details of the unit and the project. Treat the headline rates as a planning guide, and verify the exact position for your case before you finalise your budget.

What counts as affordable housing?

Affordable housing is a defined category that carries the lower one percent rate, and it turns on both price and size. Broadly, a home can qualify as affordable where its value is up to forty five lakh rupees and its carpet area is within a specified limit, which is smaller in metro cities such as Bengaluru and larger in non metro areas. Both the price and the size conditions generally need to be met for the affordable rate to apply.

For a Bengaluru buyer, the metro carpet area limit is the one that applies, so a flat can be within the price ceiling yet fall outside the affordable category on size, or the reverse. Because the classification decides whether you pay one percent or five percent, it is worth confirming for a specific flat rather than assuming from the price alone. When in doubt, check the exact criteria and how they apply to your unit.

Why does a ready flat with a completion certificate have no GST?

A ready flat with a completion or occupancy certificate is treated as a completed property, and the sale of a completed property is not a supply of construction service, so it falls outside GST. This is why a finished flat next door to an under construction one can carry no GST at all. The completion or occupancy certificate is the marker that the property has crossed from under construction to completed. For a buyer, that single certificate can be the difference between paying GST and paying none.

What about input tax credit?

For a residential buyer, input tax credit is not available, so the GST you pay is a straight cost with no offset. Since the rate structure was revised, the lower rates on under construction homes come without the ability for a residential buyer to claim credit for taxes in the chain. In practice this means the GST on your flat is money out, not something you can recover, which is why it belongs squarely in your budget.

The absence of input tax credit is easy to overlook because it sounds technical, but it has a simple consequence for you. You cannot treat the GST as recoverable, so plan for it as a real part of the price on an under construction purchase. On a ready flat with the relevant certificate, the question does not arise, since GST does not apply in the first place.

How does GST change the ready versus under construction comparison?

GST can tilt the comparison between a ready flat and an under construction one, so factor it in deliberately. An under construction flat may quote an attractive base price, but adding the applicable GST, with no input tax credit, raises the true cost, while a ready flat with the relevant certificate may carry no GST at all. This does not by itself make one better than the other, since construction stage affects many things, but it does affect the honest cost comparison.

The practical step is to compare total costs, not base prices. When you weigh a ready flat against an under construction one, add GST where it applies and leave it out where it does not, so the numbers you compare reflect what you will actually pay. Ignoring GST in that comparison flatters the under construction option in a way that can mislead a buyer into thinking it is cheaper than it truly is.

How does GST fit into your buying budget?

GST is a real line in the cost of an under construction flat, so build it into your budget from the start rather than treating it as a detail. Confirm whether the flat is under construction or completed, establish which rate applies if it is under construction, and add that amount, with no input tax credit, to your planning. For a ready flat with the relevant certificate, you can leave GST out entirely, which is itself a meaningful part of the comparison.

Pair this with today's explainer on the one percent TDS you deduct on a property purchase, and our guide on the difference between an occupancy and a completion certificate. If you are weighing a specific project, you can also review a listing such as this Bengaluru project. Together, GST, TDS and the certificates that define a completed flat shape the true cost of your purchase.

Your seven step GST checklist

1. Confirm whether the flat is under construction or a completed property.
2. Check whether a completion or occupancy certificate has been issued.
3. If under construction, establish whether it is affordable or other residential.
4. Apply the general rate, one percent affordable or five percent otherwise, to plan.
5. Remember that input tax credit is not available, so GST is a straight cost.
6. Compare total costs of ready and under construction options, GST included.
7. Confirm the exact GST position for your specific flat before you finalise.

Frequently asked questions

Is there GST on a ready to move flat?

Generally no. A ready flat that has a completion certificate or occupancy certificate is treated as a completed property, and the sale of a completed property does not attract GST. The tax applies to under construction flats, which are treated as a supply of construction service. So a finished flat with the relevant certificate can carry no GST at all.

What is the GST rate on an under construction flat?

For under construction residential flats, the rates that generally apply are one percent for affordable housing and five percent for other residential flats, in both cases without input tax credit for the buyer. The correct rate depends on whether the flat is classed as affordable, so confirm the position for your purchase.

Which flats count as affordable for GST?

Broadly, a home can qualify as affordable where its value is up to forty five lakh rupees and its carpet area is within a specified limit, smaller in metros such as Bengaluru. Both the price and size conditions generally need to be met. Because the classification decides between one and five percent, confirm the criteria for your flat.

Can a buyer claim input tax credit on a flat?

No. Input tax credit is not available to residential buyers on flat purchases, so the GST you pay on an under construction home is a straight cost with no offset or refund. So GST belongs in your budget for an under construction flat. On a ready flat with the relevant certificate, GST does not apply.

Last updated 2026-07-16. PropNewz Team.