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Loan Details
Loan Summary
$1,896
56%
Loan Summary Metrics
$300k
$1,896
$383k
$683k
6.5%
30
Amortization Schedule (First 12 Months)
| Month | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
| 1 | $1,896 | $271 | $1,625 | $299,729 |
Year-by-Year Summary
| Year | Starting Balance | Payments | Principal | Interest | Ending Balance |
|---|---|---|---|---|---|
| 1 | $300,000 | $22,749 | $2,847 | $19,902 | $297,153 |
Understanding Amortization
What is Amortization?
Amortization is the process of paying off a loan through regular payments over time. Each payment covers both principal (the original amount borrowed) and interest (the cost of borrowing). As you pay down the loan, the proportion of each payment going to interest decreases while the portion going to principal increases.
Key Amortization Concepts
- Principal: Original amount borrowed that you're paying back
- Interest: Cost of borrowing the money, calculated on remaining balance
- Payment: Fixed monthly amount (for fixed-rate loans)
- Balance: Remaining principal after each payment
- Term: Total time to pay off loan (typically 15, 20, or 30 years for mortgages)
Monthly Payment Formula
M = P × [r(1+r)^n] / [(1+r)^n - 1]
- M: Monthly payment
- P: Principal loan amount
- r: Monthly interest rate (annual rate ÷ 12)
- n: Total number of payments (years × 12)
Early Payments are Mostly Interest
- First Payment: ~85% interest, ~15% principal (for 30-year mortgage at typical rates)
- Mid-Term: ~50% interest, ~50% principal (around year 15-20)
- Last Payments: ~1% interest, ~99% principal (near end of term)
Impact of Loan Term
- 15-Year Mortgage: Higher monthly payment but ~50% less total interest
- 30-Year Mortgage: Lower monthly payment but ~2x total interest
- Example: $300,000 at 6.5%
- 15-year: $2,559/month, $160,314 interest
- 30-year: $1,896/month, $383,214 interest
Extra Payments Benefit
- Extra $200/month: Can shorten 30-year loan to ~24 years, save $60,000+ interest
- Extra $500/month: Can shorten to ~20 years, save $150,000+ interest
- Strategy: Even small extra payments early on provide large savings
Interest Rate Impact
- 5% vs 6%: $300,000 loan difference = $50,000 in interest over 30 years
- 6% vs 7%: Difference = $60,000 in interest
- Refinancing: Reduces rate = lower payment and/or faster payoff
Common Loan Types
- Mortgages: 15, 20, or 30 years. Fixed or variable rate.
- Auto Loans: 3, 4, or 5 years. Usually fixed rate.
- Personal Loans: 2-7 years. Fixed rate.
- Student Loans: 10-25 years. Fixed or variable rate.
Frequently Asked Questions
Why is early interest so high?
Interest is calculated on the remaining balance. With high balance early, interest portion is large. Over time, balance decreases, so interest decreases and principal increases.
Should I choose 15 or 30 year mortgage?
15-year: Higher payment (~35% more) but save ~50% interest. 30-year: Lower payment, more flexibility. Choose based on income and financial goals.
Does extra payment reduce term or payment?
Extra payments reduce the remaining balance, which shortens the loan term and saves interest. Monthly payment stays same, but loan ends early.
Is refinancing worth it?
If new rate is 0.5% lower and you stay 5+ years, usually yes. But consider closing costs (~2-5% of loan). Break-even is typically 2-3 years.
Can I prepay my loan?
Most loans allow prepayment without penalty. Check your loan document. Prepaying is one of the best ways to reduce total interest.
What affects the interest rate offered?
Credit score (biggest factor), down payment size, loan term, market rates, and loan type. Better credit = lower rate.
Is this calculator accurate for my loan?
Good estimate. Actual may vary if loan has different compounding (daily vs monthly), variable rates, or fees. Verify with lender.
How much should I put down on a house?
20% avoids PMI (mortgage insurance). 10-15% acceptable with PMI. 5% for first-time buyers. Larger down payment = lower interest rate.
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