Reverse flat price calculator

Stamp duty, registration and GST sit on top of the flat price. This works out the gap either way round.

●Budget

○Flat price

Your outer limit

Total money you want to spend

₹

5 L₹5 lakh steps5 Cr

Carpet area, if you know it — optional

sq ft

What sits on top of the price

Stamp duty

Registration

GST

No GST once the completion certificate is out, or on a resale flat.

Brokerage

Fixed extras

₹

Fixed extras: legal fees, society charges, parking, franking, loan processing — anything quoted as a rupee amount rather than a percentage.

Agreement value you can offer

—

Where the money goes

Total outflow—

Before you rely on this

Stamp duty and registration are charged on the agreement value or the state's circle / ready-reckoner rate, whichever is higher. If the rate for that locality is above the price you negotiate, your duty is calculated on the higher figure and the number above will fall short.
Rates vary by state and city, and some states give women buyers a concession — confirm the current figures with your sub-registrar.
GST applies to the base price of an under-construction flat, not to stamp duty or registration.
1% TDS applies where the value crosses ₹50 lakh, but it is deducted from what you pay the seller — it doesn't add to your outflow, so it isn't counted here.
Home loan borrowers: most banks fund a share of the agreement value only, and won't lend against stamp duty, registration or GST. Those come from your own pocket.