Pre-EMI or full EMI on an under-construction flat: what 'pay later' costs on an ₹80 lakh loan

Rules and rates as of 12 October 2026.

Festive-season launches in Pune and Bengaluru often come with a line that sounds like a gift: "pay only pre-EMI till possession." The monthly figure in the brochure is small, sometimes a fifth of the full EMI. What the brochure rarely shows is the bill at the end. This explainer works through one loan both ways so you can see where the money goes.

How an under-construction loan is paid out

On a flat that is still being built, the bank does not hand the whole loan to the developer on day one. The Reserve Bank of India told banks in its circular of 3 September 2013 that disbursal of housing loans sanctioned to individuals "should be closely linked to the stages of construction", and that upfront disbursal should not be made for incomplete, under-construction or greenfield projects. The same circular flagged the risks of builder-tie-up schemes in which the bank pays the builder ahead of construction. A parallel circular went to state and central co-operative banks on 8 October 2013.

So your loan arrives in tranches: a slice when the agreement is registered, more as slabs are cast, and the last part around possession. Separately, the Real Estate (Regulation and Development) Act caps what a developer can take as advance before a registered agreement for sale at 10% of the cost (section 13).

Interest runs only on the amount the bank has actually paid out. The question is what you pay each month while the rest is still to come. There are two broad answers.

Pre-EMI: interest only, principal untouched

With pre-EMI, you pay just the interest on the disbursed amount every month. Not a rupee of principal goes down. Your full EMI starts only after the final disbursement, and the 20-year clock starts then too.

Full EMI (tranche EMI): repayment starts at once

With full or tranche EMI, you start paying a regular EMI from the first disbursement. Part of every payment reduces principal. Banks offer variants: some set the EMI on the full sanctioned loan from month one; others calculate it on what has been disbursed and step it up with each tranche. We compute both.

The worked example

Assume a ₹80 lakh loan at 8.0% a year, floating. That is an illustrative rate: repo at 5.50% plus a 2.50% spread. Your bank's spread will differ. Construction-linked disbursal over 30 months: ₹16 lakh at month 0, ₹12 lakh each at months 6, 12, 18 and 24, and the last ₹16 lakh at month 30. Tenure is 20 years (240 months). The rate is held constant for simplicity; under the RBI's 4 September 2019 external benchmark circular, a repo-linked rate resets at least once in three months, so real numbers will move.

The EMI formula is EMI = P × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1), with r = 8%/12 = 0.006667 and n = 240. On P = ₹80,00,000 that gives ₹66,915 a month.

Path A, pre-EMI. Monthly interest = disbursed amount × 0.08 ÷ 12. On the first ₹16 lakh that is ₹10,667; on ₹64 lakh in the last six months it is ₹42,667. Over 30 months the pre-EMI adds up to ₹8,00,000, all interest. On possession you still owe the full ₹80 lakh and start the ₹66,915 EMI for 240 months, which carries ₹80,59,649 of interest on its own.

Path B, full EMI from month one. You pay ₹66,915 from the first disbursement. Early on, much of it goes to principal because only ₹16 lakh is out. By the time the last tranche lands, the balance is about ₹66.5 lakh rather than ₹80 lakh, and the loan closes in month 194.

Path C, EMI on the disbursed amount. The EMI is recalculated on what has been disbursed so that the loan ends 240 months after the first disbursement. It rises with each tranche and settles at about ₹54,652 after the last one.

Path	Paid during 30-month build	Total interest	Loan closes
A: Pre-EMI, then full EMI	₹8,00,000 (all interest)	₹88,59,649	Month 270 (22.5 years)
B: Full EMI from month one	₹20,07,456	₹49,38,567	Month 194 (about 16 years)
C: EMI on disbursed amount	₹10,16,951	₹74,71,550	Month 240 (20 years)

Figures are our own month-by-month calculation, rounded to the rupee; interest is charged monthly on the opening balance.

Reading the numbers honestly

Path B looks spectacular, but it is not free money: you are paying about ₹12 lakh more during construction than in Path A, and that extra repayment is what shrinks the interest bill and the tenure. Path B is roughly a large prepayment made early. The fairer comparison is between A and C. Paying about ₹2.2 lakh more during construction (C versus A) cuts total interest by about ₹13.9 lakh and ends the loan two and a half years sooner. The reason is simple: under pre-EMI, 30 months of payments clear no principal, and the full 20-year term begins only after that.

Pre-EMI is not irrational. If you are also paying rent during construction, the lower outgo may be the only thing that fits the budget. The cost is time: you are buying 30 months of breathing room with a longer, more expensive loan. A part-way option is to start on pre-EMI and prepay once possession comes; the RBI bars foreclosure and prepayment charges on floating-rate loans to individuals for non-business purposes.

What delay does to each path

If possession slips from month 30 to month 42, pre-EMI on ₹64 lakh for twelve more months costs another ₹5,12,000, and it still clears no principal. On a full-EMI path the extra months keep reducing your balance, so a delay hurts less in interest terms, though it still hurts your budget if you are paying rent.

The tax angle under the new Act

Under the Income-tax Act, 2025, section 22 (formerly section 24(b)) allows interest on capital borrowed to acquire or construct a house. Interest for the period before the tax year in which the house is acquired or constructed is allowed in five equal instalments, starting from that year. For a self-occupied home, though, section 22(2) caps the combined interest deduction at ₹2 lakh a year, and an amendment effective 1 April 2026 makes the cap cover both current and pre-construction interest. It also requires construction to be completed within five years from the end of the tax year in which the loan was taken; otherwise the cap falls to ₹30,000.

In our example, first-year interest after possession is already about ₹6.3 lakh, well above ₹2 lakh. So for a self-occupied flat, the pre-EMI interest instalments may add nothing to your deduction. Which tax regime you choose also matters; a chartered accountant can work out your case.