How to compare mortgage offers effectively
When shopping for a mortgage, lenders compete on multiple dimensions at once: the interest rate, the loan term, origination fees, and discount points. Comparing just the interest rate is a common mistake. A loan with a lower rate might carry thousands of dollars more in upfront fees, making it the worse deal for a buyer who moves or refinances within a few years.
A thorough comparison looks at three numbers together: the monthly payment, the total interest paid over the life of the loan, and the total cost including all fees. Only by aligning all three can you determine which offer is actually cheaper for your specific situation.
Key metrics explained
**Monthly payment** is the amount you pay each month toward principal and interest. It is calculated using the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n - 1], where P is the loan principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of monthly payments.
**Total interest paid** is the sum of all interest charges over the full loan term. It equals the total of all payments minus the original loan amount. This number grows quickly with longer terms and higher rates.
**Total cost** combines all loan payments with upfront fees (closing costs and points). It is the most complete single-number comparison between two offers, assuming you hold the loan to maturity.
**APR vs. interest rate:** The Annual Percentage Rate (APR) attempts to express the true cost of a loan by spreading fees into an effective annual rate. A low nominal rate with high fees can still produce a high APR. This calculator shows total cost directly, which is more intuitive than APR for side-by-side comparison.
What closing costs and points mean
**Closing costs** are one-time fees paid at settlement. They include lender origination fees, title insurance, appraisal fees, attorney fees, and government recording fees. These vary by lender and location and typically range from 2% to 5% of the loan amount.
**Discount points** are prepaid interest. One point equals 1% of the loan amount, paid upfront to permanently reduce the interest rate (typically by 0.25% per point, though this varies). Paying points makes sense when you keep the loan long enough to recoup the upfront cost through lower monthly payments.
For example, paying 1 point on a \$400,000 loan costs \$4,000 upfront. If that point lowers the rate enough to save \$50/month, you break even in 80 months (about 6.5 years). If you sell or refinance before that, the point was not worth buying.
Break-even analysis: when to pay points
The break-even point is the number of months you need to keep the loan before the savings from a lower rate offset the higher upfront cost. The formula is:
Break-even months = (Higher upfront fees) / (Monthly savings from lower rate)
If the break-even point is 48 months and you expect to stay 10 years, paying more upfront for a lower rate is likely the better decision. If you plan to relocate in 3 years, choosing the lower-fee loan is almost always smarter regardless of the rate difference.
Refinancing resets the clock. Even if you currently have a mortgage with high fees, refinancing into a lower-rate loan restarts the break-even calculation from scratch.
How to use this calculator
1. Enter the loan amount, interest rate, and term for Mortgage A. 2. Enter the closing costs in dollars for Mortgage A (check your Loan Estimate document). 3. Enter the number of discount points for Mortgage A (0 if none). 4. Repeat steps 1 through 3 for Mortgage B. 5. Review the monthly payment, total interest, total fees, and total cost for each loan. 6. If Mortgage B has a lower rate but higher fees, check the break-even analysis to see how long you need to stay to benefit. 7. Use the amortization charts to visualize how quickly each loan pays down.
FAQs
Q: Should I always choose the loan with the lowest monthly payment? A: Not necessarily. A lower monthly payment from a longer term means you pay interest for more years, which can result in a much higher total cost. Compare total cost alongside monthly payment to see the full picture.
Q: What is included in closing costs? A: Closing costs typically include lender origination fees, discount points (if any), title insurance, appraisal, home inspection, attorney fees, prepaid insurance, and prepaid property taxes. Your lender is required to provide a Loan Estimate within three business days of your application that itemizes all fees.
Q: Does this calculator account for PMI or property taxes? A: No. This calculator focuses on the principal and interest components plus upfront fees, which is what differs between competing offers. Property taxes, homeowner's insurance, and private mortgage insurance (PMI) are typically the same regardless of which lender you choose and are not part of the rate comparison.
Q: How do I compare a 15-year vs. 30-year mortgage? A: Enter the same loan amount and rate but use different terms. The 15-year loan will show a higher monthly payment but dramatically lower total interest. The total cost comparison reveals the true trade-off between cash flow (monthly payment) and long-term savings.
Q: What if the two loans have different loan amounts? A: You can enter different loan amounts for each mortgage. This is useful if one lender requires you to roll closing costs into the loan balance while another keeps them as an upfront charge.
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