IMPS (Immediate Payment Service)

Definition

What happens when your bank says your NEFT payment will settle "in the next batch" but your vendor needs the money now? You use IMPS. Launched by NPCI in 2010, IMPS settles funds in seconds (not batches, not hours, seconds) directly into the beneficiary's account. And unlike the old RTGS system (which used to shut down on weekends), IMPS runs 24x7x365. Sunday night at 11 PM? Works fine. Diwali? No problem. It's the payment rail you reach for when timing matters and the amount is under Rs 5 lakh.

You can trigger an IMPS transfer through internet banking, a mobile banking app, SMS banking, or even an ATM. The system routes using either the beneficiary's account number plus IFSC code, or their mobile number linked to a Mobile Money Identifier (MMID). RBI has set the ceiling at Rs 5 lakh per transaction, though your bank might impose a lower limit. Charges? Minimal, anywhere from free to Rs 25 depending on the bank and amount. GST applies on whatever service charge the bank levies, but we're talking small numbers.

In practice, IMPS fills a very specific gap. It's what finance teams use for last-minute vendor payments that can't wait for the next NEFT batch, emergency salary disbursements, customer refunds that need to land immediately, and inter-company transfers outside banking hours. For fintech platforms building on banking APIs, IMPS is a critical underlying rail. And every transaction generates a unique RRN (Response Reference Number) that serves as irrefutable payment proof, useful when you need to show the tax department that yes, the TDS deposit was made on time, or when a vendor disputes whether payment was received.

Key Points

• IMPS settles interbank transfers in real time (within seconds) unlike batch-processed NEFT.
• Available 24 hours a day, 365 days a year, including weekends and public holidays. No blackout windows.
• RBI caps IMPS at Rs 5 lakh per transaction, though individual banks may set lower internal limits.
• Initiate via internet banking, mobile apps, SMS, or ATMs using account+IFSC or mobile number+MMID.
• Every transaction generates a unique RRN that works as legal proof of payment for compliance and disputes.
• Bank charges range from zero to Rs 25 depending on amount and bank, plus 18% GST on the service charge.