GLOBAL PAYMENTS KNOWLEDGEISO 20022 / SWIFT / SEPA / MT / MX
PAYMENTSSIGNAL

The interactive academy for the standards, messages, and rails that move money.

GET IN TOUCH
NACH (INDIA, NPCI)

Unpaid EMI: a NACH Debit returned through the batch

Trigger: Riya's account has insufficient funds (or the NACH mandate is cancelled), so Bank Alfa cannot pay the NACH Debit collection.

Contributor Shubham Mathure

What operations sees first: A recurring collection that entered the batch comes back unpaid through the NACH return cycle, reported to the lender.

WHERE IS THE MONEY?

Not collected from Riya — the item was returned unpaid, so the money stayed in her account (or was reversed by the return).

DID SETTLEMENT HAPPEN?

The collection did not stick; the unpaid item is unwound through the NACH return cycle.

WHO ACTS NEXT?

Bank Alfa (payer bank) Asha Traders re-presents the collection or contacts Riya; repeated failures may prompt review of the mandate.

PLAY THE EXCEPTION

Trigger: When Bank Alfa tries to apply the debit, Riya's account has insufficient funds (or the mandate was cancelled), so the item cannot be paid.

STEP 1 / 10INTERNAL

A registered NACH mandate authorises the recurring pull

Riya (payer / borrower) → Bank Alfa (Riya's / destination bank)

Earlier, Riya registered a NACH mandate (an e-mandate) that authorises Asha Traders to pull a fixed EMI from her account on schedule. Without this standing authorisation the collection could not begin.

Step 1 of 10: A registered NACH mandate authorises the recurring pull

  1. 01Processing
    A registered NACH mandate authorises the recurring pullRiya (payer / borrower) → Bank Alfa (Riya's / destination bank)
  2. 02Message
    Asha Traders submits the collection to its sponsor bankAsha Traders (collector / lender) → Nordbank (sponsor / creditor bank)
  3. 03Message
    Nordbank presents the collection into a NACH batch cycleNordbank (sponsor / creditor bank) → NACH / NPCI (clearing house)
  4. 04Clearing obligation
    NPCI clears the batch and calculates net positionsNACH / NPCI (clearing house)
  5. 05Settlement
    Net positions settle in central bank money at the RBIBank Alfa (Riya's / destination bank) → Nordbank (sponsor / creditor bank)
  6. 06Posting
    Bank Alfa debits Riya under the mandateBank Alfa (Riya's / destination bank)
  7. 07 · EXCEPTION PATHProcessing
    Bank Alfa cannot pay the itemBank Alfa (Riya's / destination bank)
  8. 08 · EXCEPTION PATHMessage
    Bank Alfa returns the item through the NACH cycleBank Alfa (Riya's / destination bank) → NACH / NPCI (clearing house)
  9. 09 · EXCEPTION PATHMessage
    The return is reported back to NordbankNACH / NPCI (clearing house) → Nordbank (sponsor / creditor bank)
  10. 10 · EXCEPTION PATHSettlement
    The unpaid item is netted back at settlementNordbank (sponsor / creditor bank) → Bank Alfa (Riya's / destination bank)
  11. OUTCOME
    Funds
    Never left Riya's account for this cycle — the debit could not be applied.
    Settlement
    Any provisional net movement is reversed through the batch return cycle.
    Who acts next
    Bank Alfa (Riya's / destination bank) — Riya funds the account (or re-registers the mandate) before the next cycle; Asha Traders re-presents the EMI.
Full step-by-step text (works without JavaScript)
  1. 01Processing
    A registered NACH mandate authorises the recurring pullRiya (payer / borrower) → Bank Alfa (Riya's / destination bank)

    Earlier, Riya registered a NACH mandate (an e-mandate) that authorises Asha Traders to pull a fixed EMI from her account on schedule. Without this standing authorisation the collection could not begin.

  2. 02Message
    Asha Traders submits the collection to its sponsor bankAsha Traders (collector / lender) → Nordbank (sponsor / creditor bank)

    Asha Traders hands the NACH Debit collection for Riya's EMI to Nordbank, its sponsor bank. This is an instruction to collect — no money has moved yet, and each item names the mandate that authorises it.

  3. 03Message
    Nordbank presents the collection into a NACH batch cycleNordbank (sponsor / creditor bank) → NACH / NPCI (clearing house)

    Nordbank groups Riya's item with many other collections and presents them into a NACH batch cycle at NPCI. NACH works in scheduled batches, not instantly, so the item waits for its cycle.

  4. 04Clearing obligation
    NPCI clears the batch and calculates net positionsNACH / NPCI (clearing house)

    NPCI validates the batch and works out each bank's net position for the cycle — the sum owed after all pulls and pushes net off. This produces who-owes-whom, not yet any movement of money.

    Clearing produces net obligations for the cycle. Bank Alfa owes Nordbank its net amount; the actual money moves only at settlement.

  5. 05Settlement
    Net positions settle in central bank money at the RBIBank Alfa (Riya's / destination bank) → Nordbank (sponsor / creditor bank)

    The netted positions settle across the banks' accounts at the Reserve Bank of India, in central bank money. Only now does money actually move from Bank Alfa's side to Nordbank's side for the whole cycle.

    • DR Bank Alfa settlement account at RBI — INR 8,500.00
    • CR Nordbank settlement account at RBI — INR 8,500.00
  6. 06Posting
    Bank Alfa debits Riya under the mandateBank Alfa (Riya's / destination bank)

    Acting on the cleared item and the registered mandate, Bank Alfa books the debit to Riya's account. Her EMI has now left her account for this cycle's collection.

    • DR Riya's savings account at Bank Alfa — INR 8,500.00
  7. 07 · EXCEPTION PATHProcessing
    Bank Alfa cannot pay the itemBank Alfa (Riya's / destination bank)

    The balance will not cover the EMI, or the mandate is no longer active, so Bank Alfa marks the item unpaid. It does not partly pay — a NACH Debit item is paid in full or returned.

  8. 08 · EXCEPTION PATHMessage
    Bank Alfa returns the item through the NACH cycleBank Alfa (Riya's / destination bank) → NACH / NPCI (clearing house)

    The unpaid item is sent back as a NACH return with a reason code. Returns travel through a batch return cycle at NPCI, the same way the collection arrived — not as an instant reply.

  9. 09 · EXCEPTION PATHMessage
    The return is reported back to NordbankNACH / NPCI (clearing house) → Nordbank (sponsor / creditor bank)

    NPCI routes the return report to Nordbank, which passes the reason back to Asha Traders so the lender knows the EMI was not collected this cycle.

  10. 10 · EXCEPTION PATHSettlement
    The unpaid item is netted back at settlementNordbank (sponsor / creditor bank) → Bank Alfa (Riya's / destination bank)

    Because the item is returned, its amount is reversed out of the net positions for the return cycle, so no money stays moved for Riya's failed EMI.

    • DR Nordbank settlement account at RBI — INR 8,500.00
    • CR Bank Alfa settlement account at RBI — INR 8,500.00
  11. OUTCOME
    Funds
    Never left Riya's account for this cycle — the debit could not be applied.
    Settlement
    Any provisional net movement is reversed through the batch return cycle.
    Who acts next
    Bank Alfa (Riya's / destination bank) — Riya funds the account (or re-registers the mandate) before the next cycle; Asha Traders re-presents the EMI.

THE TIMELINE

  1. 01Asha Traders (lender)
    Submits a NACH Debit collection of INR 8,500.00 for Riya's loan EMI under her registered NACH mandate.
  2. 02NACH / NPCI
    Clears the collection in a batch cycle and the banks settle net in central bank money at the RBI.
  3. 03Bank Alfa (payer bank)
    Cannot pay the EMI because Riya's account lacks funds, so it returns the item unpaid through the NACH cycle.

    NACH returns travel back through the batch cycle, not instantly.

  4. 04Asha Traders
    Receives the unpaid return with a reason code and follows up with Riya or re-presents.

Resolution: NACH is a bulk batch system, so a failed collection returns through the same cycle. The lender learns of the unpaid EMI through the NACH return, not instantly.

LEARN THE CONCEPTS

Sources for this scenario2
  1. Official requirement

    National Automated Clearing House (NACH) ↗ — National Payments Corporation of India (NPCI) · NACH returns

    Describes NACH, the NPCI-operated bulk clearing system for recurring high-volume push and pull payments: NACH Credit (e.g. salary, dividend, subsidy disbursement) and NACH Debit (e.g. utility, loan EMI, insurance collections under a registered mandate), processed in batch cycles. · Checked 2026-07-14

    NACH is Indias bulk/recurring batch system, analogous to Bacs (UK) and ACH (US).

  2. Simplified educational illustration

    Payments Signal editorial teaching models — Payments Signal

    This site's own simplified teaching models. · Checked 2026-07-12

    What this simplifies: Single-cycle teaching model; participant-specific handling and exact timings vary.

    Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.