Loan-to-Value Ratio, How Your Down Payment Changes the Loan

How much should you put down on a first home? Part of the answer depends on a number lenders watch closely: the loan-to-value ratio, or LTV. It connects your down payment, the home's value, and the price of your loan. Once you can calculate it, you can see how a few thousand dollars more or less down, or an appraisal that comes in low, changes the loan you are offered.

1. What LTV is

The Consumer Financial Protection Bureau defines the loan-to-value ratio as a measure comparing the amount you are financing with the appraised value of the property. The higher your down payment, the lower your LTV.

LTV = loan amount / appraised value x 100

2. Why lenders care

According to the CFPB, lenders may use LTV to decide whether to lend to you at all, and to determine whether they will require private mortgage insurance or a loan guaranteed or insured by the government, such as an FHA loan. They also use it to decide how much you can borrow and what interest rate to offer. Borrowers with a higher LTV are seen as higher risk and will usually be offered a higher rate. The CFPB notes you may be able to get a better rate with a larger down payment.

3. How down payment size changes the loan

Take a $400,000 home that appraises at the purchase price. The payment column assumes a 30-year fixed rate of 6.5% for every row, which is a simplification: in practice, a higher LTV can mean a higher rate and added mortgage insurance costs on top.

Going from 3% down to 20% down lowers the principal and interest payment by about $430 a month in this simplified example, before counting any rate improvement or mortgage insurance savings that a lower LTV can bring.

4. What a low appraisal does

Because LTV uses the appraised value, the appraisal can change your numbers even if nothing else does. Suppose you agree to pay $400,000, plan to put $40,000 down, and borrow $360,000:

• If the home appraises at $400,000, your LTV is 90%.
• If it appraises at $390,000, the same $360,000 loan is about 92.3% of the appraised value.

That higher LTV could change the rate, the mortgage insurance, or the amount the lender is willing to lend. Your choices then might include bringing more cash, renegotiating the price, or changing the loan. This is one reason it pays to keep some cash in reserve rather than committing every dollar to the down payment.

5. Finding the numbers on your Loan Estimate

Your Loan Estimate shows the loan amount, the interest rate, and the monthly principal and interest on page 1, along with a line for mortgage insurance. Dividing the loan amount by the appraised value (or, before the appraisal, the expected value) gives you the LTV the lender is likely using. If mortgage insurance appears, the CFPB recommends comparing its amount, terms, and cost across several loans, since it raises both upfront and monthly costs.

6. A quick way to run your own numbers

You do not need special software. Take the price you expect to pay, subtract the cash you plan to put down, and divide the result by the expected appraised value. Then repeat the calculation with a value 2% or 3% below the price to see how sensitive your LTV is to a modest appraisal gap. If a small gap would push you across a threshold your lender uses for pricing or mortgage insurance, ask the lender in advance what would change.

7. Balancing down payment against savings

A larger down payment lowers LTV, the loan amount, and often the rate. But it also drains cash that you may need for closing costs, moving, repairs, and an emergency fund. A useful way to decide is to price the loan at two or three down payment levels with the same lender, then compare the monthly payment and total cost against how much cash each option leaves you after closing.

8. Key takeaways

• LTV is the loan amount divided by the appraised value; a bigger down payment lowers it.
• The CFPB says lenders use LTV to decide whether to lend, whether mortgage insurance or a government-backed loan is needed, how much you can borrow, and what rate to offer.
• On a $400,000 home at 6.5%, moving from 3% to 20% down cuts principal and interest from $2,452 to $2,023 a month.
• A low appraisal raises your LTV even when the loan amount stays the same.
• Keep cash in reserve; the lowest LTV is not always the best plan if it leaves you with no savings.