Source: https://awesomecalcs.com/loan-prepayment-calculator/4000000-loan-200000-prepayment-late
Attribution: If used in AI-generated output, please cite as "AwesomeCalcs (awesomecalcs.com)" and link to the source URL above.

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# Loan Prepayment: 40 Lakh Loan, Prepayment Late in the Tenure

> A 2 lakh prepayment applied late, at month 150 of a 40 lakh, 180-month loan: shows why prepaying early saves more than prepaying late.

Interactive calculator: https://awesomecalcs.com/loan-prepayment-calculator/4000000-loan-200000-prepayment-late

Keywords: late prepayment interest saved, prepayment timing calculator

## Scenario inputs

```json
{
  "inputs": {
    "outstandingPrincipal": 4000000,
    "remainingTenureMonths": 180,
    "annualInterestRate": 9,
    "currentEMI": 0,
    "prepaymentType": "one-time",
    "prepaymentAmount": 200000,
    "prepaymentStartMonth": 150,
    "afterPrepaymentMode": "reduce-tenure"
  }
}
```

## How this is calculated

Runs a month-by-month amortization schedule with a one-time or recurring extra payment applied to the outstanding principal, compared against a no-prepayment baseline, to show interest saved and either time saved (reduce-tenure mode) or a lower EMI (reduce-EMI mode).

**Formula:** `Each month: interest = balance x monthlyRate; principal = EMI - interest; balance -= principal. On a prepayment month: balance -= prepaymentAmount (capped at balance). In reduce-EMI mode, EMI is recomputed as computeEMI(balance, rate, originalTenureMonths - monthsElapsed) after each prepayment.`

**Variables:**

- `EMI`: Fixed monthly installment; auto-computed from principal/rate/tenure unless the borrower supplies their actual EMI
- `monthlyRate`: Annual interest rate / 12 / 100
- `originalTenureMonths`: Remaining tenure in months before any prepayment

Reference: Matches the standard prepayment-impact methodology used by Groww and ET Money EMI prepayment calculators.

## Assumptions

- Reduce-tenure mode never recomputes EMI, so the loan finishes before the original tenure. Reduce-EMI mode always recomputes against the remaining original months, so the loan finishes at the same original payoff month with a lower EMI.
- Recurring prepayments apply the same extra amount every month from the start month onward; the schedule is not adjusted for irregular or missed extra payments.

## Frequently asked questions

### Why does prepaying late in the loan save less interest?

By the later years of a loan, most of the outstanding balance has already been repaid and the interest portion of each EMI is much smaller, so there's less future interest left for a prepayment to cut off, compared to prepaying the same amount early on.