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RERA delay interest calculator: what a late possession owes you
Under section 18 of the RERA Act, a buyer who stays in a delayed project is owed interest for every month of delay, on the amount already paid. In Maharashtra the rate is fixed by Rule 18 of the Maharashtra RERA Rules 2017: State Bank of India's highest marginal cost of lending rate (MCLR) plus 2 percent. SBI's highest MCLR is 8.90% as of June 2026, so the working rate today is 10.90% per annum. The same rate applies in reverse when a buyer delays a payment, which is why the model agreement quotes one rate for both sides.
Estimate only. MCLR changes over time and authorities compute period by period with the MCLR applicable in each period; this calculator applies one rate across the whole delay. Interest is simple interest on the amount paid.
How the calculation works
Interest = amount paid x (MCLR + 2%) x days of delay / 365. A buyer who has paid Rs 50 lakh into a project that is 12 months late is owed roughly Rs 5.45 lakh at today's rate. The clock runs from the possession date written in the registered agreement, not the date quoted in the brochure, which is one more reason the agreement date matters. Our guides explain the delay rules and how to file the complaint that turns this number into an order.
Checking a specific project before this ever becomes your problem is cheaper: the Rs 499 buyer report reads the promoter's delay history across every past project.
Frequently asked questions
What interest rate applies for delayed possession under MahaRERA?
SBI's highest marginal cost of lending rate plus 2 percent per annum, per Rule 18 of the Maharashtra RERA Rules 2017. SBI's highest MCLR is 8.90% as of June 2026, so the rate currently works out to 10.90% per annum.
From which date is delay interest calculated?
From the possession date promised in your registered agreement for sale until actual possession, on the amount you have paid. Section 18 lets you stay in the project and claim interest for every month of delay, or exit and claim a refund with interest.
Does the builder pay this interest automatically?
No. You claim it by filing a complaint with MahaRERA (fee Rs 5,000) or, while the project is live, by a written demand citing section 18. Orders that go unpaid can be executed as recovery warrants through the district collector.
Sources: Maharashtra RERA Rules 2017, Rule 18; SBI MCLR schedule effective 15 June 2026. Rates verified July 2026.