Mortgage Points vs Down Payment Calculator

What This Calculator Does and Why It Matters

When you close on a mortgage, you often have a choice about how to spend your available cash. You can put more money toward your down payment to reduce the loan amount, or you can use some of that cash to buy discount points and lower your interest rate. Both strategies reduce your long-term borrowing cost, but they work in very different ways. This free mortgage points vs down payment calculator lets you model both options side by side to see which one actually saves you more money over your loan term.

This decision comes up at almost every mortgage closing, yet many buyers make it without running the actual numbers. A lower interest rate sounds attractive, but if it takes 12 years to break even on the cost of buying points and you only plan to stay in the home for 7 years, you would be better off with the larger down payment. This tool removes the guesswork.

How to Use This Calculator

Step-by-Step Instructions

1. Enter the home purchase price and the loan term in years.
2. Under Option A (Buy Points), enter your planned down payment and the interest rate your lender is offering with points. Enter the number of points you are buying. One point equals one percent of the loan amount. The tool calculates the cost automatically, but you can override it with a custom dollar amount if your lender has quoted a different figure.
3. Under Option B (Larger Down Payment), enter the down payment amount you are considering and the interest rate without buying points.
4. Click Compare Options to see monthly payments, total interest, total cost for each option, and the break-even period.

The Formula Explained

Breaking Down the Formula

The calculator uses the standard mortgage amortization formula to compute the monthly payment for each option: M = P × r(1+r)^n / ((1+r)^n – 1), where P is the principal, r is the monthly interest rate, and n is the number of payments. Total cost for each option is the sum of all monthly payments plus the upfront cash spent, which includes the down payment and any points purchased.

The break-even point is calculated by dividing the extra upfront cost of buying points by the monthly payment savings they produce. This is a critical number. According to guidance from the Consumer Financial Protection Bureau, discount points only make financial sense if you keep the loan long enough to reach the break-even period.

Example Calculation with Real Numbers

Suppose a buyer is purchasing a $500,000 home. Option A: $100,000 down payment, 2 discount points at a 6.25 percent rate. Points cost = $400,000 × 2% = $8,000. Monthly payment ≈ $2,463. Option B: $108,000 down payment (same total cash outlay), no points, rate of 6.875 percent. Loan = $392,000. Monthly payment ≈ $2,574. Option A saves $111 per month. With $8,000 more in effective upfront cost, break-even is approximately 72 months or 6 years. If you plan to stay longer than 6 years, buying points wins. You can also explore how rate and cost decisions interact by checking the HELOC vs Home Equity Loan Cost Calculator or the FHA vs Conventional Loan Comparison Calculator.

When Would You Use This

Real Life Use Cases

This decision comes up every time a mortgage borrower has flexible cash at closing. It is relevant for first-time buyers, move-up buyers, and refinancers evaluating rate buydown options. It also matters for investors who want to minimize carrying costs on rental properties. For anyone working through closing decisions, the Closing Costs Estimator by State is a useful companion tool.

Specific Example Scenario

A couple buying their first home has $80,000 saved. Their lender offers a rate of 7.25 percent with no points or 6.75 percent with 1.5 points. They plan to live in the home for at least 10 years. Running the numbers through this calculator shows that the break-even on buying points is 52 months, well within their 10-year horizon. Buying the points saves them over $18,000 in total interest over the loan term. Without the calculator, they might have defaulted to a larger down payment simply because it felt safer.

Tips for Getting Accurate Results

Use Lender-Quoted Rates, Not Advertised Averages

Published average mortgage rates from sources like Freddie Mac’s Primary Mortgage Market Survey are useful for context, but the rate you actually get depends on your credit score, loan-to-value ratio, property type, and lender. Always get a formal Loan Estimate from your lender before running this comparison, so you are using real numbers rather than national averages.

Factor In PMI If Your Down Payment Is Below 20 Percent

If either option results in a down payment below 20 percent of the purchase price, you will likely need to pay private mortgage insurance (PMI). PMI adds to your monthly cost and changes the total cost comparison significantly. Add your estimated PMI premiums to the monthly payment when comparing scenarios where the loan-to-value ratio differs between options.

Consider How Long You Plan to Stay

The break-even period is the single most important output of this calculator for most borrowers. If you move, refinance, or pay off the loan before reaching break-even, buying points costs you money rather than saving it. Think honestly about your plans before committing cash to a rate buydown. If you are unsure, a larger down payment is typically the safer choice because the equity benefit begins immediately and does not depend on staying in the home for a specific period.

Frequently Asked Questions

What is a mortgage discount point?

A discount point is an upfront fee paid to a lender in exchange for a lower interest rate. One point equals one percent of the loan amount. Paying one point on a $400,000 loan costs $4,000. The rate reduction per point varies by lender and market conditions but is typically around 0.25 percent per point.

Is it better to put more money down or buy points?

It depends on two things: how long you plan to keep the loan, and how the rate-to-cost ratio compares between options. A larger down payment provides immediate equity and reduces your loan balance permanently. Buying points provides ongoing monthly savings, but only pays off if you stay in the home long enough to reach break-even. This calculator helps you identify which is better for your specific situation.

Are mortgage points tax deductible?

In many cases, yes. Points paid on a home purchase mortgage may be deductible as mortgage interest in the year paid, subject to IRS rules and itemization requirements. Points paid on a refinance are typically deducted over the life of the loan rather than all at once. Consult a tax professional for guidance specific to your situation, or refer to IRS Publication 936.

What is the break-even period and why does it matter?

The break-even period is the number of months it takes for cumulative monthly payment savings from buying points to equal the upfront cost of those points. If you sell or refinance before reaching break-even, you lose money on the points. If you stay past break-even, every additional month saves you money. It is the key number when deciding whether to buy points.

Can I compare different down payment amounts in Option A and Option B?

Yes. The calculator allows you to set a different down payment amount for each option. This is especially useful when comparing a scenario where you put the same total cash to work in two different ways — for example, $100,000 down with $8,000 in points versus $108,000 down with no points.

Does a larger down payment always reduce PMI?

A larger down payment reduces your loan-to-value ratio, and if it gets your LTV to 80 percent or below, it eliminates the need for PMI entirely on a conventional loan. Eliminating PMI can be worth hundreds of dollars per month and significantly changes the total cost comparison, so always factor this in when evaluating your options.

What if I refinance before the break-even point?

If you refinance before reaching the break-even period, the points you paid are sunk costs. You do not get them back, and you did not stay long enough to recoup them through monthly savings. In a refinance scenario, any unrecouped points from the original loan should be factored into the total cost of the new loan when evaluating whether to refinance.

How many points can I buy on a mortgage?

Most lenders allow borrowers to buy up to 3 to 4 discount points, though limits vary. There is a practical ceiling on how much rate reduction you can achieve because lenders cap how low they will go regardless of how many points are paid. Always ask your lender for a rate sheet showing the cost-to-rate tradeoff at various point levels before using this calculator.

Conclusion

The mortgage points vs down payment decision is one of the most impactful financial choices you make at the closing table, and it deserves more than a gut feeling. This free calculator gives you the full comparison including monthly payments, total interest, total cost, and a precise break-even timeline so you can make the choice that best fits your financial goals and plans. Run both scenarios with your actual lender quotes before committing to either path.