Repayment Method: EMI (Equal Monthly Installment) or Equal Principal
Start Date (used to compute each due date and Payoff Date)
Configure “Extra Payments”:
Monthly Extra Payment
Annual Extra Payment
One‑time Payments: click “Add Payment” (enter period and amount)
Extra Payment Effect: Shorten Loan Term or Reduce Monthly Payment
Click “Calculate” to view results (KPIs, savings, charts, amortization table).
What repayment methods are available?
Equal Monthly Installment (EMI): fixed total payment per month; higher interest portion early, higher principal portion later. Best for stable cash flow.
Equal Principal: fixed principal per period, interest declines with remaining balance. Lower total interest but higher upfront monthly payments.
How do extra payments work?
Monthly Extra: add a fixed amount each period on top of regular payment; applied to principal.
Annual Extra: add a fixed amount once per year; applied to principal.
One‑time Payment: apply a lump sum at a specified period (via modal).
Effect Mode:
Shorten Loan Term: keep original monthly payment; extra amounts accelerate payoff and maximize interest savings.
Reduce Monthly Payment: recalculate payment downward as principal drops; friendlier cash flow but less term reduction.
Multiple extras can stack; the system applies them in chronological order to reduce principal.
How do Start Date and Payoff Date work?
Start Date determines actual due dates and the final Payoff Date.
Changing Start Date affects calendar distribution but not formulas; minor differences may occur due to rounding or lender-specific rules.
What results and savings will I see?
Core KPIs: Monthly Payment, Total Interest, Total Payment, Payoff Date.
Extra Payment Savings: shows Interest Saved and Time Saved.
How do I use the chart and window slider?
The chart visualizes principal vs. interest dynamics over time.
Use the dual‑end slider to select a range (Start/End) and zoom into specific periods.
Drag the handles or the selected window; labels update live with the chosen range.
How do I use the amortization table?
Toggle “Expand All / Collapse” to adjust visibility.
Click “Export to Excel” to download CSV (Excel‑ready).
Click “Share Link” to generate a URL with parameters for sharing the same scenario.