Down Payment Calculator: How Much Cash You Need to Buy a Home

Ask most first-time buyers how much cash they need and they will say 20% of the price. That is the down payment, and it is only part of the cheque book. The bank lends against the property’s value, not against the taxes and fees you pay to buy it. So stamp duty, registration, GST on a new flat, and the lawyer’s and broker’s bills all sit on top of the down payment, and they usually add up to another 8–15% of the price.

This calculator puts those pieces together. It starts from the RBI’s loan-to-value ceiling for your price, lets you choose how much of that you actually want to borrow, and adds GST, state stamp duty and registration, and a percentage for other costs. The headline is the total cash you need before the loan starts paying for the rest.

• Property price: the agreement value of the home.
• Loan you want (% of price): capped automatically at the RBI limit for that price, 90%, 80% or 75%. Borrowing less than the maximum raises your down payment but lowers your EMI.
• State: sets the stamp duty and registration rate for a male buyer.
• Brokerage, legal and loan fees (% of price): processing fees, legal and valuation charges, and brokerage if you use a broker. 1% is a reasonable starting point; resale deals with a broker often cost more.
• Under construction: tick it for a flat that is not yet complete, and the calculator adds GST at 5%, or 1% when the price is ₹45 lakh or less.

The result shows the total cash needed at the top, then the down payment and its share of the price, the loan amount, GST, stamp duty and registration, and fees.

Take a ₹1.2 crore under-construction 3BHK in Noida. At that price the RBI cap is 75%, so the most a bank will lend is ₹90 lakh and your minimum down payment is ₹30 lakh. Now add the rest.

The cash requirement is 39% of the price for the under-construction flat, not 25%. The ready flat saves ₹6 lakh of GST, which is one reason a completed home can be the better buy even at a slightly higher price.

The loan-to-value cap steps down as the price rises, so smaller homes need a smaller share in cash. We ran four under-construction flats in Uttar Pradesh through the calculator at the maximum loan and 1% fees.

Banks can lend less than the cap, and often do, based on your income, age, credit score and the property’s legal status. The cap is a ceiling, not a promise. Use the home loan eligibility calculator alongside this one to see what your income supports.

For an under-construction home you rarely pay the whole down payment on day one. RERA’s Section 13 bars a builder from taking more than 10% of the price as an advance before a written agreement for sale is registered. After that, most projects follow a construction-linked plan: you pay your own share at each stage and the bank disburses its share as construction progresses, with GST charged on each instalment.

• Booking: up to 10% of the price, from your savings.
• Agreement and early stages: your remaining down payment is usually due before the bank disburses much.
• Construction stages: the bank pays its share against the builder’s demand letters; you pay GST and pre-EMI interest on what has been disbursed.
• Possession: registration, stamp duty, society charges and interiors, all from your own funds.

Plans with a large payment at possession, or subvention schemes where the builder pays interest for a period, change this timing. Read the payment schedule in the agreement, not the brochure.

A resale purchase changes the shape of the cash requirement in three ways. There is no GST, because GST applies only to homes sold before completion. The whole down payment is usually due in one go, at or before registration, because the seller wants the full price on the day the deed is signed rather than in stages. And the bank lends against its own valuation of the flat, which can come in below the agreed price, especially in older buildings.

That last point catches many buyers out. If you agree ₹1 crore for a flat and the bank values it at ₹92 lakh, a 75% loan is ₹69 lakh, not ₹75 lakh, and the ₹6 lakh gap comes from your pocket. Ask the lender for a valuation before you sign the agreement, and keep a cushion of a few per cent of the price for exactly this reason. Resale deals also more often involve a broker, so set the fees input to 2% rather than 1% if you are paying brokerage on top of the legal and loan charges.

• Savings and investments you can redeem without penalty. Plan redemptions of equity funds so they don’t coincide with a market fall right before a payment is due.
• EPF withdrawal. The EPF scheme allows members to withdraw for buying a house after the required years of membership, subject to limits; check the current rules on the EPFO portal before counting on it.
• Gifts from close family, which should be documented clearly for the bank and for tax records.
• Proceeds from selling another property, keeping capital-gains exemptions under Section 54 in mind.

Avoid funding the down payment with a personal loan or a credit card. Banks check for recent borrowing, it raises your total EMI burden, and it removes the safety margin the down payment is supposed to provide.

• Women-buyer and joint-ownership concessions on stamp duty.
• Preferential location charges, car parking, club membership and other extras quoted separately by builders; ask whether they are inside the agreement value.
• Society deposits, maintenance paid in advance, utility connection charges and interiors at possession.
• Pre-EMI interest during construction.
• The carpet-area test for the 1% affordable-housing GST rate.

• Planning for 20% and forgetting duty, GST and fees, then scrambling in the final weeks.
• Assuming the bank will lend the RBI maximum. Your income and the property’s paperwork decide the real sanction.
• Emptying the emergency fund. Keep six months of expenses, including the new EMI, after paying everything.
• Paying more than 10% to a builder before a registered agreement. RERA forbids it for a reason.
• Ignoring extras. Car parking and preferential location charges can add several lakh to what you pay in cash.