let amortizationSteps = “”; function calculateAmortization(){ amortizationSteps=””; const loanAmount = parseFloat(document.getElementById(“loanAmount”).value); const interestRate = parseFloat(document.getElementById(“interestRate”).value) / 100 / 12; const loanTerm = parseInt(document.getElementById(“loanTerm”).value) * 12; const extraPayment = parseFloat(document.getElementById(“extraPayment”).value); if (isNaN(loanAmount) || isNaN(interestRate) || isNaN(loanTerm) || isNaN(extraPayment) || loanAmount <= 0 || interestRate <= 0 || loanTerm 0) { let interest = principal * interestRate; let payment = monthlyPayment + extraPayment – interest; if (payment < 0) payment = 0; principal -= payment; totalInterest += interest; monthsPaid++; if (principal < 0) break; } let newLoanTerm = (monthsPaid / 12).toFixed(1); let interestSaved = totalInterest – (loanAmount * interestRate * loanTerm); document.getElementById("newTerm").value = newLoanTerm + " years"; document.getElementById("interestSavings").value = "$" + interestSaved.toFixed(2); amortizationSteps += `Inputs:
Loan Amount: $${loanAmount.toFixed(2)}
Interest Rate: ${interestRate * 100}%
Loan Term: ${loanTerm / 12} years
Extra Payment: $${extraPayment.toFixed(2)}

`; amortizationSteps += `Formulas:
Monthly Payment = Loan Amount × Interest Rate / (1 – (1 + Interest Rate)^-Loan Term)
Amortization Time = Number of Months to Payoff

`; amortizationSteps += `Results:
New Loan Term: ${newLoanTerm} years
Interest Saved: $${interestSaved.toFixed(2)}
`; if (document.getElementById(“calculationStepsAmortization”).style.display === “block”) { document.getElementById(“calculationStepsAmortization”).innerHTML = amortizationSteps; } } function resetAmortization(){ document.querySelectorAll(“#calculator input”).forEach(el => el.value = “”); amortizationSteps = “”; document.getElementById(“calculationStepsAmortization”).innerHTML = “

Not calculated yet.

“; } function toggleAmortizationSteps(){ const s = document.getElementById(“calculationStepsAmortization”); const a = document.getElementById(“toggleArrowAmortization”); if (s.style.display === “none” || s.style.display === “”) { s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = amortizationSteps || “

Not calculated yet.

“; } else { s.style.display = “none”; a.style.transform = “rotate(0deg)”; } }