A larger down payment reduces both your loan amount and your interest rate

Yes. A bigger down payment lowers your monthly mortgage payment in two ways. First, you borrow less money overall—if you put down 20% instead of 5%, the lender finances a smaller principal, which means lower monthly payments. Second, lenders typically offer better interest rates to borrowers who put down more money, because the lender's risk is lower. A lower interest rate compounds the savings across the life of the loan.

The math is straightforward. On a $300,000 home, a 5% down payment means you borrow $285,000. A 20% down payment means you borrow $240,000. That $45,000 difference in principal directly reduces what you owe each month. On top of that, the 20% down borrower often qualifies for a rate 0.25% to 0.5% lower than the 5% down borrower, which further shrinks the monthly payment.

Key Takeaways

  • A larger down payment reduces the loan amount, which lowers your monthly principal and interest payment.
  • Lenders typically offer lower interest rates to borrowers with larger down payments because the lender's risk decreases.
  • Putting down 20% or more usually eliminates private mortgage insurance (PMI), which can save $100 to $300 per month depending on the loan size.
  • The total savings from a bigger down payment compound over 15, 20, or 30 years, often totaling tens of thousands of dollars in interest.
  • A down payment below 20% does not disqualify you, but you will pay PMI and a higher interest rate than a 20% down borrower.

How down payment size affects your interest rate

Mortgage lenders price risk into the interest rate they offer you. A borrower with a 20% down payment has already invested a substantial amount of their own money, so they are less likely to walk away from the loan or default. A borrower with a 3% down payment has less skin in the game, so the lender charges a higher rate to compensate for that risk.

The rate difference is not uniform across all lenders or all loan types. Conventional loans (not backed by the Federal Housing Administration or Department of Veterans Affairs) typically show the largest rate spread based on down payment size. A borrower putting down 20% might receive a rate of 6.5%, while a borrower putting down 5% might receive 7.0% or higher on the same day from the same lender. Over a 30-year loan, that 0.5% difference adds up to tens of thousands of dollars in extra interest paid.

Private mortgage insurance and down payments under 20%

Private mortgage insurance (PMI) is an additional monthly cost that lenders require when your down payment is less than 20%. PMI protects the lender if you default, but you pay the premium. On a $300,000 home with a 10% down payment, PMI typically costs $150 to $250 per month, depending on your credit score and the loan terms. With a 5% down payment, PMI can run $250 to $400 per month.

PMI is not permanent—once you reach 20% equity in the home (through a combination of down payment and principal paydown), you can request to have it removed. However, this takes years on most loans. A 20% down payment eliminates PMI entirely from day one, which is one of the largest monthly savings available to you. Combined with the lower interest rate, the monthly payment difference between a 5% down and 20% down borrower can easily exceed $400 per month on a typical home.

The total cost difference over the life of the loan

The savings from a larger down payment compound dramatically over time. Consider a $300,000 home with a 30-year mortgage at current rates. A borrower putting down 5% ($15,000) borrows $285,000 at roughly 7.0%, pays PMI of $200 per month, and has a total monthly payment around $2,150. A borrower putting down 20% ($60,000) borrows $240,000 at roughly 6.5%, pays no PMI, and has a total monthly payment around $1,520.

The difference is $630 per month. Over 30 years, that is $226,800 in additional payments for the 5% down borrower. The 5% down borrower also paid $45,000 less upfront, but they will pay that back many times over in higher interest and PMI. The 20% down borrower spent an extra $45,000 at closing but saved $226,800 over the loan term—a net savings of roughly $181,800.

These numbers vary based on current interest rates, your credit score, the loan term you choose, and the home price. The principle remains the same: a bigger down payment reduces both the monthly payment and the total interest paid.

When a smaller down payment still makes sense

A larger down payment is not always the right choice, even though it lowers your payment. If you have limited savings and putting down 20% would drain your emergency fund, a smaller down payment may be wiser. Carrying PMI and a higher interest rate is expensive, but losing your financial cushion is riskier. Lenders generally want to see that you have reserves—money left over after closing—to cover unexpected repairs or job loss.

Additionally, if you expect to sell or refinance within five to seven years, the upfront cost of a larger down payment may not pay off before you move or refinance. If interest rates drop significantly, you can refinance and remove PMI without waiting for 20% equity, which changes the math. In these scenarios, a 10% or 15% down payment can be a reasonable middle ground.

Down payment assistance programs and your options

If you want a larger down payment but do not have the cash saved, some programs help. State housing finance agencies, nonprofits, and some employers offer down payment assistance grants or low-interest loans. These programs vary widely by location and income level. A grant does not require repayment, but a down payment assistance loan does—it becomes a second lien on the home, which lenders factor into your debt-to-income ratio.

Before pursuing assistance, compare the cost. If a down payment assistance loan charges 5% interest and you would otherwise pay PMI at 0.5% of the loan value annually, the math may favor the assistance loan. However, if the assistance loan has origination fees or a higher rate, PMI might be cheaper. Run the numbers with your lender before committing to either path.

Frequently Asked Questions

How much does my interest rate drop if I put down 20% instead of 10%?

The rate difference varies by lender, loan type, and market conditions, but typically ranges from 0.25% to 0.5%. On a $300,000 loan, a 0.5% rate difference saves roughly $100 to $150 per month. Ask your lender for a rate quote at both down payment levels to see the exact difference.

Can I put down 15% and avoid PMI?

No. PMI is required on any conventional loan with less than 20% down. At 15% down, you still pay PMI until you reach 20% equity. The PMI cost is lower than at 5% or 10%, but it is not eliminated. FHA loans have a different requirement—they require mortgage insurance even at 10% down, though the rate is lower than conventional PMI.

What if I put down 25%—do I save more than 20%?

Yes, but with diminishing returns. A 25% down payment eliminates PMI (like 20%) and may may have access to you for an even slightly better rate, but the rate improvement is usually minimal beyond the 20% threshold. The main benefit of 25% or higher is psychological—you owe less and build equity faster—but the monthly payment savings over 20% are small.

If I put down more now, can I refinance later and get that money back?

Not directly. Refinancing replaces your old loan with a new one at a new rate, but the money you put down at closing stays in the home as equity. You could do a cash-out refinance to borrow against that equity, but you would pay closing costs and a new interest rate, which usually makes it uneconomical unless rates have dropped significantly.

Does a bigger down payment affect my credit score?

The down payment itself does not affect your credit score. However, saving a larger down payment may mean you have less available credit or lower credit utilization, which can slightly improve your score. The mortgage application and hard inquiry will temporarily lower your score by a few points, but this is the same regardless of down payment size.