Compare the scheduled and accelerated payoff paths
A payoff calculation answers a different question from a loan-payment calculator: what changes after the scheduled payment is already known? This workspace compares the original amortization path with an accelerated principal strategy so the time and interest difference stays visible.
How to use this calculator
Enter the current principal, annual rate and remaining term.
Add an optional recurring extra-principal amount and/or one-time lump sum with its payment number.
Compare payoff months, interest and total paid; inspect the first 12 accelerated payments.
Where people use it
- •Testing a recurring overpayment plan
- •Comparing a one-time principal prepayment
- •Estimating time and interest saved before asking a lender for an official payoff quote
Example: add extra principal every month
Keeping the scheduled payment unchanged while adding principal can reduce the balance sooner, which reduces later interest. The exact saving depends on balance, rate, timing and lender rules.
Assumptions to verify with your lender
- •This model assumes a fixed annual rate and monthly interest convention.
- •Extra amounts are applied to principal without recasting the scheduled payment.
- •Fees, prepayment penalties, taxes, insurance, daily-interest conventions and lender-specific allocation rules are not included.
Frequently asked questions
Is this the same as an EMI calculator?+
No. EMI solves the scheduled payment from principal, rate and term. This calculator compares that baseline with accelerated principal payments.
Does an extra payment always reduce interest?+
In this model, earlier principal reduction lowers future interest. A real lender may apply payments differently, so verify the payoff rules.
Can I model a lump-sum prepayment?+
Yes. Enter the lump sum and the payment number when it should be applied.
Semantic next steps
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