What a larger down payment does to your mortgage
A larger down payment lowers the amount you borrow, which shrinks your monthly payment, reduces the total interest you pay over the life of the loan, and often improves the terms the lender offers you. If you put down 20 percent instead of 5 percent, you are borrowing less money—so the math on everything that follows changes in your favor.
The effect compounds across three separate places: the principal balance (what you owe), the interest rate the lender charges you, and whether you have to pay mortgage insurance. Each one moves independently, but they all move down when your down payment goes up.
Key Takeaways
- A down payment of 20 percent or more typically eliminates private mortgage insurance (PMI), which can cost 0.5 to 1.5 percent of your loan amount annually.
- Lenders often offer lower interest rates to borrowers who put down more money, because the lender's risk decreases when you have more of your own money at stake.
- Your monthly payment drops because you are borrowing less principal, and the interest charged each month is calculated on a smaller balance.
- The total interest paid over 15 or 30 years can be tens of thousands of dollars lower with a larger down payment, even if the interest rate stays the same.
- The benefit of a larger down payment must be weighed against keeping cash liquid for emergencies, home repairs, or other financial goals.
How down payment size affects your monthly payment
Your monthly payment is built from three parts: principal (the amount borrowed), interest (what the lender charges), and taxes and insurance (which vary by location). A larger down payment shrinks the principal immediately, which means a smaller monthly payment before interest is even calculated.
On a $300,000 home, a 5 percent down payment means you borrow $285,000. A 20 percent down payment means you borrow $240,000. That $45,000 difference in borrowed amount translates directly into a lower monthly payment. At a 7 percent interest rate over 30 years, the difference between those two scenarios is roughly $300 per month—before any other factors change.
The interest portion of your payment also shrinks because interest is calculated on the remaining balance each month. A smaller loan balance means smaller interest charges, which compounds over decades. Early in the loan, most of your payment goes to interest; later, more goes to principal. A larger down payment shifts that balance in your favor from month one.
Private mortgage insurance and the 20 percent threshold
Private mortgage insurance (PMI) is a monthly fee lenders charge when you borrow more than 80 percent of the home's value. If you put down less than 20 percent, you pay PMI on top of your regular mortgage payment. If you put down 20 percent or more, PMI disappears.
PMI typically costs between 0.5 and 1.5 percent of your loan amount per year, paid monthly. On a $240,000 loan, that can be $100 to $300 per month. On a $285,000 loan (the 5 percent down scenario), it could be $120 to $360 per month. That fee continues until you have paid down the loan to 80 percent of the home's original value—which takes years, even with a 30-year mortgage.
Reaching the 20 percent down payment threshold eliminates this cost entirely. The monthly savings from removing PMI alone often exceed $150, and that money stays in your pocket for the entire life of the loan.
Interest rates and lender risk
Lenders offer lower interest rates to borrowers who put down more money. The reason is simple: when you have more of your own cash invested in the home, you are less likely to walk away if the market turns. A larger down payment signals financial stability and reduces the lender's risk of loss if they have to foreclose and sell the home.
The difference in interest rates between a 5 percent down payment and a 20 percent down payment can be 0.25 to 0.75 percentage points. On a $240,000 loan, that 0.5 percentage point difference means paying roughly $60 to $80 less per month. Over 30 years, that adds up to $21,600 to $28,800 in interest savings—on top of the savings from borrowing less principal in the first place.
Rate differences vary by lender and by market conditions. Shop with multiple lenders to see what rates they offer at different down payment levels; the difference may be smaller or larger than the range above, depending on your credit score, income, and the current lending environment.
Total interest paid over the life of the loan
The cumulative effect of a larger down payment on total interest is substantial. On a $300,000 home purchase, here is how the numbers shift:
| Down Payment | Amount Borrowed | Est. Interest Rate | Monthly Payment (P&I only) | Total Interest Paid (30 years) |
|---|---|---|---|---|
| 5% ($15,000) | $285,000 | 7.5% | ~$1,995 | ~$433,200 |
| 10% ($30,000) | $270,000 | 7.25% | ~$1,844 | ~$393,840 |
| 20% ($60,000) | $240,000 | 7.0% | ~$1,596 | ~$314,560 |
These figures are estimates based on typical rate differences; your actual rates will depend on your credit score, the lender, and current market conditions. The key point: the difference between 5 percent and 20 percent down is roughly $119,000 in total interest over 30 years, plus the elimination of PMI payments (another $40,000 to $100,000 depending on how long you carry it).
Even a move from 10 percent to 20 percent saves roughly $80,000 in interest and removes PMI entirely. These are not small numbers, and they compound over decades.
When a larger down payment may not be the best choice
A larger down payment is mathematically advantageous, but it is not always the right financial move for your situation. If putting down 20 percent leaves you with less than three to six months of expenses in savings, you are taking on risk. A major home repair, job loss, or medical emergency becomes a crisis if you have no cash reserves.
Similarly, if you have high-interest debt (credit cards, personal loans), paying that down or off before increasing your down payment often makes more financial sense. A credit card at 18 percent interest costs you more than a mortgage at 7 percent saves you.
Some borrowers also benefit from keeping cash liquid if they expect to invest it elsewhere—though this depends on your risk tolerance and investment returns. The may provide savings from a larger down payment (lower interest, no PMI) are often more reliable than speculative returns.
How to decide what down payment makes sense for you
Start by calculating your monthly payment and total interest at different down payment levels using a mortgage calculator. Most lenders provide these tools on their websites, and they account for PMI, interest rates, and your specific loan term.
Next, look at your cash position. How much do you have saved after the down payment? Can you cover three to six months of living expenses plus a major home repair (roof, HVAC, foundation work can cost $5,000 to $25,000)? If the answer is no, a smaller down payment may be safer.
Finally, compare the monthly payment difference to your budget. If moving from 10 percent to 20 percent down saves you $250 per month but stretches your housing budget too thin, the smaller down payment is the right choice. A mortgage you can afford is better than one that forces you to cut other parts of your life.
Frequently Asked Questions
Does a larger down payment lock in a lower interest rate?
Lenders typically offer lower rates to borrowers with larger down payments, but the rate is not locked until you formally lock it with the lender—usually within 30 to 60 days of closing. Shop with multiple lenders to see the rates they offer at your down payment level, then lock the rate that works for you.
Can I remove PMI after I reach 20 percent equity?
Yes, but the process depends on your loan type and lender. With a conventional loan, you can request PMI removal once you have paid the loan down to 80 percent of the home's original purchase price. Some lenders remove it automatically; others require you to request it in writing. FHA loans have mortgage insurance that cannot be removed, regardless of equity.
What if I can only afford a 5 or 10 percent down payment?
A smaller down payment is still a valid path to homeownership. You will pay PMI and a higher interest rate, but your monthly payment will be lower, and you preserve cash for emergencies. As your income grows or the home appreciates, you can refinance with a larger equity stake and remove PMI.
Does a larger down payment affect my credit score?
Saving money for a down payment does not hurt your credit. The mortgage itself will appear on your credit report and may temporarily lower your score when the lender pulls your credit, but taking on a mortgage and making on-time payments builds credit over time.
Should I delay buying a home to save for a larger down payment?
That depends on your local housing market and personal timeline. If home prices are rising faster than you can save, a smaller down payment now may cost less overall than waiting. If prices are stable or declining, waiting to save more can make sense. Consider both the financial math and your life circumstances—job stability, family plans, how long you plan to stay in the home.