A bigger down payment lowers your monthly payment and the total interest you pay

The more money you put down when you buy a home, the less you have to borrow. A smaller loan means a smaller monthly payment and less total interest paid over the life of the mortgage. For example, if you put down 20 percent instead of 5 percent on the same house, your loan amount drops by 15 percent of the purchase price — and so does the interest the lender charges you on that smaller amount.

The relationship is direct: put down more money upfront, owe less to the bank, pay less each month. This is the core reason people save for larger down payments, even though it takes longer to accumulate the money.

Key Takeaways

  • A larger down payment reduces your loan amount dollar-for-dollar, which lowers your monthly mortgage payment and the total interest you pay over 15, 20, or 30 years.
  • Down payments of 20 percent or more usually remove the requirement to pay private mortgage insurance (PMI), which can add $100 to $300 per month to your payment.
  • Lenders often offer better interest rates to borrowers who put down more money, because the bank's risk is lower.
  • A larger down payment means less money available for other needs like emergency savings, home repairs, or investments, so the choice depends on your full financial picture.
  • The "right" down payment size balances getting a manageable monthly payment against keeping enough cash on hand for unexpected costs.

How down payment size changes your monthly payment

Your monthly mortgage payment is calculated on the amount you borrow, not the price of the house. If a house costs $300,000 and you put down $60,000 (20 percent), you borrow $240,000. If you put down $15,000 (5 percent), you borrow $285,000. The difference in what you owe is $45,000, and that difference shows up in your monthly payment every single month for the next 15 to 30 years.

On a 30-year mortgage at a typical interest rate, that $45,000 difference translates to roughly $240 to $280 more per month. Over 30 years, you pay that extra amount 360 times, which means the larger down payment saves you tens of thousands of dollars in total payments — even before counting the interest you avoid.

Private mortgage insurance (PMI) and the 20 percent threshold

Private mortgage insurance is a monthly fee the lender charges you if your down payment is less than 20 percent. It protects the bank if you stop paying, but you pay the cost. PMI typically runs between 0.5 and 1 percent of your loan amount per year, which means $100 to $300 per month on a $200,000 to $300,000 loan.

Putting down 20 percent or more eliminates PMI entirely. This is one of the biggest financial jumps in down payment size — the difference between a 19 percent down payment and a 20 percent down payment can be $150 to $250 per month in savings, even though the loan amount only drops by 1 percent. If you are considering a down payment between 15 and 25 percent, the 20 percent mark is worth calculating carefully.

PMI does not build equity or go toward your home — it is pure insurance cost. Once you reach 20 percent equity in your home through a combination of down payment and payments over time, you can request that PMI be removed, but that takes years on most mortgages.

Interest rates and larger down payments

Lenders often offer lower interest rates to borrowers who put down more money. A 5 percent down payment might carry a 7.2 percent interest rate, while a 20 percent down payment on the same house might be offered at 6.8 percent. The difference seems small — 0.4 percent — but it compounds over 30 years and can save you $30,000 to $50,000 in interest.

The reason is risk: when you put down less money, you have less of your own money at stake, so the lender sees you as more likely to walk away if the home value drops. A larger down payment signals that you have savings, stability, and commitment to the purchase. Lenders reward that with better rates.

The exact rate difference varies by lender, credit score, and market conditions, so it is worth getting quotes from multiple lenders to see how your down payment size affects the rate they offer.

The trade-off: down payment versus emergency savings

Putting down the largest possible amount is not always the right choice, even though it saves money on interest. If you put every dollar you have into the down payment, you may not have cash left for a home inspection, closing costs, moving expenses, or repairs that come up in the first year of ownership. A furnace breaks, the roof leaks, or you need to replace the water heater — these are not rare events in older homes.

Financial advisors often suggest keeping three to six months of living expenses in savings before buying a home, separate from your down payment. This means a larger down payment might mean delaying your home purchase by a year or more while you save both the down payment and an emergency fund. That delay is sometimes the right choice, and sometimes it is not — it depends on whether home prices and rents in your area are rising, whether you are in a stable job, and whether you have other financial goals.

The "best" down payment is the one that lets you afford the monthly payment comfortably while keeping enough cash on hand that a $5,000 repair does not become a crisis.

How to calculate the real cost of a smaller down payment

If you are deciding between a 10 percent and 20 percent down payment, or between 15 percent and 25 percent, you can run the numbers yourself using a mortgage calculator. Enter the house price, the down payment amount, the interest rate the lender quoted you, and the loan term (15, 20, or 30 years). The calculator shows you the monthly payment and the total amount you will pay over the life of the loan.

Then add the cost of PMI if your down payment is under 20 percent. Multiply your loan amount by 0.005 to 0.01 (the typical PMI range) and divide by 12 to get a monthly cost. Add that to the monthly payment the calculator gave you. Now you can see the true monthly cost of each down payment option, including insurance.

Subtract the larger down payment amount from your current savings to see how much cash you would have left. If that number is less than three months of your living expenses, a smaller down payment might be safer, even if it costs more in interest and insurance.

Down payment size and loan approval

A larger down payment makes it easier to get approved for a mortgage. Lenders have minimum down payment requirements — often 3 to 5 percent for conventional loans — but they are more willing to approve borrowers with larger down payments, even if credit scores or income are borderline. A 25 percent down payment signals financial stability in a way that a 5 percent down payment does not.

If your credit score is below 650, your income is variable, or you are self-employed, a larger down payment can be the difference between approval and rejection. In these situations, saving for a 15 or 20 percent down payment is not just about saving money on interest — it is about being able to buy a home at all.

Frequently Asked Questions

Is 20 percent down payment really necessary?

No. You can buy a home with 3 to 5 percent down, but you will pay PMI until you reach 20 percent equity. Whether 20 percent is worth saving for depends on how long you plan to stay in the home and whether the interest and PMI savings outweigh the cost of delaying your purchase.

Can I put down more than 50 percent?

Yes. Some people put down 30, 40, or even 50 percent or more. The larger the down payment, the lower your monthly payment and total interest. The trade-off is having less cash available for other needs, so make sure you keep an emergency fund separate from your down payment.

Does a larger down payment help if I have bad credit?

Yes. A substantial down payment (15 percent or more) can help you get approved even with a lower credit score, because it reduces the lender's risk. You may still pay a higher interest rate, but approval becomes more likely.

What if I put down 19 percent instead of 20 percent?

You will still pay PMI, which typically costs $100 to $300 per month. The 1 percent difference in down payment does not save you the PMI cost. If you are close to 20 percent, it is usually worth saving the extra amount to cross that threshold.

Can I take out a loan to make a larger down payment?

Lenders will usually not approve a mortgage if you borrowed the down payment money from another source. They want to see that the down payment comes from your own savings. Taking out a personal loan or credit card debt to fund a down payment can also hurt your credit score and debt-to-income ratio, making mortgage approval harder.