How Much a $400K Conventional Loan Costs Monthly With Little Down

The Quick Read: The monthly payment is a stack of four parts, and a small down payment makes two of them heavier. Principal and interest rise because the loan is larger. Mortgage insurance is added because you owe more than 80% of the home’s value. Taxes, homeowners insurance and any HOA dues sit on top. The only way to see your real number is a Loan Estimate built on your credit, your down payment and your property.

What Does “$400K” Mean Here?

It can mean two things. It might be the purchase price, or it might be the loan amount. The difference matters because mortgage insurance and pricing follow the loan-to-value ratio, not the loan size alone.

If $400K is the price, a 3% down payment puts the loan at 97% of the price. A 5% down payment puts it at 95%. If $400K is the loan itself, the home costs more and the down payment is a percentage of that higher price. Either way, a loan near that size is typically a conforming balance, so it does not move into jumbo territory.

This article reads the number as a price. The logic holds for the other reading too. Only the starting point changes.

The Four Parts of the Monthly Payment

The total payment is four pieces added together. The Consumer Financial Protection Bureau describes the same stack: principal, interest, mortgage insurance if it applies, and escrow for homeowners insurance and taxes. Condo or HOA fees are usually paid separately.

Principal and interest stay fixed on a fixed-rate loan. Escrow does not. If your taxes or insurance premium change, the total payment changes with them.

That last point trips up many first-time buyers. The payment is “fixed” only in the principal-and-interest slice. Budget for the escrow portion to move.

How Little Down Works on a Conventional Loan

Across the wholesale programs we place files with, the lowest down payments follow two simple lines. A buyer with a first-time-buyer profile can often use 97% loan-to-value, which is 3% down, on a one-unit principal residence with a fixed rate. Other buyers generally start at 95% loan-to-value, which is 5% down. These figures are subject to lender guidelines and full file review.

Fannie Mae’s 97% LTV FAQ explains the shape of the rule. The 97% options are fixed-rate, run up to 30 years, and go through automated underwriting. Gifts and grants can fund the down payment and closing costs. Adjustable-rate and high-balance loans are not eligible for 97%. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.

There is also an income-based path. HomeReady and Home Possible carry an income limit of 80% of area median income. They can reach 3% down without a first-time-buyer requirement. That makes them useful for repeat buyers who fit the income cap. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.

Lendmire arranges these loans through wholesale lenders. The brokerage’s conventional loan programs cover the purchase paths described here. Whether a file fits one depends on credit, ratios, reserves and the property.

How the Payment Changes at 3% Versus 5% Down

The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.

Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.

Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Here is the direction of each change, using percentages of the price.

Each step down in down payment adds a little to the loan. It also moves the file into a higher mortgage insurance tier. Fannie Mae’s mortgage insurance coverage requirements set required coverage by LTV band. Higher coverage generally means a higher premium.

The premium also depends on your credit score. Published typical annual premiums run from 0.58% to 1.86% of the loan balance. That is a range, not a quote. Where you land depends on credit, LTV and the coverage level. On a loan near this size, that gap is the spread between a modest add-on and a meaningful one.

Credit also affects one-time pricing adjustments that lenders usually build into the rate or charge as fees. Those adjustments rise as credit weakens and LTV climbs. A strong score with 5% down can pencil very differently from a middling score with 3% down.

A Worked Walkthrough Without Dollar Figures

Take two buyers looking at the same home at that price. Both use a fixed-rate loan on a one-unit primary residence.

Buyer one is a first-time buyer with 3% down. The loan is 97% of price. The file carries the highest standard mortgage insurance tier. Cash to close is lowest, but the monthly cost is highest. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

Buyer two is a repeat buyer with 5% down. The loan is 95% of price. The insurance tier is lower. Monthly cost drops, and cash to close rises by two points of the price. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.

Now change one more thing. Both buyers have a 740 score instead of a 640 score. Insurance pricing and one-time adjustments ease. Credit can move the payment as much as the down payment does.

Run the third scenario too. Buyer two puts down 10%. Insurance still applies, since the loan is above 80% LTV. The coverage tier is lower still. The payment falls again. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

So the best tier is rarely the lowest one. It is the tier that leaves you with cash reserves after closing and a payment you can carry through a tax reassessment.

What the Lender Looks For

The wholesale conventional programs we use start at a 620 decision score. An adjustable rate under manual underwriting starts at 640. Most files run through automated underwriting, and the automated finding governs. The total ratio ceiling is 50%.

A manually underwritten file is tighter. Ratio limits are 36% or 45%, with reserve and score factors that follow the Eligibility Matrix. Agency waiting periods also apply after credit events. That is four years from a chapter 7 discharge, seven from a foreclosure, and four from a short sale or deed-in-lieu. Documented extenuating circumstances can shorten those periods.

Qualification uses the full payment, not just principal and interest. Lenders count mortgage insurance, taxes, insurance and HOA dues in the ratio. A buyer who sizes a budget on principal and interest alone will come up short.

Fannie Mae’s Eligibility Matrix lists maximum LTV by occupancy, units and transaction. It is the lookup for edge cases. Lender overlays can be stricter than the agency matrix.

Where the General Rule Breaks

The 3% and 5% rules bend in several places. Each one changes the payment.

• Two- to four-unit homes. A principal residence with two to four units goes to 95% at best, so 3% down is off the table.
• Second homes. Maximum leverage is 90%, which means at least 10% down.
• Investment property. Leverage is lower still, at 85% on one unit and 75% on two to four. If you are buying to rent it out, occupancy sets the leverage, and the lighter down payments here do not apply.
• Adjustable-rate loans. These stay at the lower leverage tier and cannot use 97%.
• Manufactured housing. The standard 97% path does not extend to it in the same way.
• Condos. The building has to meet project eligibility. That can change both approval and cost.
• Low appraisals. Value drives LTV. If the appraisal comes in low, your LTV rises. That can push you into a higher insurance tier, or out of a program.

Another quiet trap is the appraisal’s effect on a future insurance cancellation. Cancellation rules key off the original value at purchase.

Repeat buyers face the most confusion here. Many assume the 3% route is closed to them. It is not always closed, but it generally runs through the income-limited programs. Lendmire’s piece Can a Repeat Buyer Get a Conventional Loan With Little Down? walks through that path.

Can the Insurance Come Off Later?

Yes, on most standard conventional loans. This is the biggest difference from some other low-down loan types. Under the Homeowners Protection Act, you may request cancellation when your balance reaches 80% of the original value. You need a good payment history, no subordinate liens and no decline in value. The servicer must end it automatically when the balance is first scheduled to reach 78% of original value, as long as you are current. The CFPB’s examination procedures lay out the rule.

Two details matter. First, the 78% date comes from the original amortization schedule and original value, not from a new appraisal. Second, lender-paid mortgage insurance is different. The borrower cannot cancel it. It ends only on a payoff or refinance, and it usually comes with a higher rate in exchange.

Mortgage insurance can be paid monthly, upfront at closing, or as a mix. An upfront premium may not be refundable if you sell or refinance early. Monthly is the common choice for buyers keeping cash tight.

If the payment feels too heavy later, a refinance is one lever. Lendmire’s piece Is It Time to Refinance a Conventional Mortgage That Costs Too Much? explains how to weigh it.

Common Mistakes

• Budgeting only principal and interest. The escrow and insurance lines are real.
• Believing you need 20% down. Conventional loans go well below that, with mortgage insurance in the picture.
• Assuming insurance protects you. It protects the lender. It does not stop foreclosure if you fall behind.
• Mixing up mortgage insurance and homeowners insurance. They are separate policies with separate bills.
• Confusing the loan limit with a budget. The conforming limit caps the loan amount, not what you can afford.
• Spending every dollar on the down payment. Closing costs and prepaid escrow need cash too. Gifts and grants can help cover them on the 97% programs. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.

Key Terms Defined

Loan-to-value (LTV): The loan amount divided by the home’s value, shown as a percentage.

Private mortgage insurance (PMI): Coverage on a conventional loan that protects the lender when you put less than 20% down. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.

Escrow: An account where the servicer collects roughly one-twelfth of your yearly taxes and homeowners insurance each month.

Loan-level price adjustment: A one-time pricing charge based on credit score, LTV and loan features, usually folded into the rate or fees.

Automated underwriting: Software that reviews your whole file and issues a finding on whether it meets agency rules.

Loan Estimate: The form that shows your projected monthly payment, including mortgage insurance, so you can compare lenders.

Next Steps

Start by deciding what number you mean by “$400K,” then settle your budget on the full payment, not principal and interest alone. Pull a Loan Estimate with a 3% and a 5% scenario side by side. Compare the insurance line and the cash to close on each.

If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

Lendmire is a mortgage brokerage (NMLS# 2371349) licensed for consumer mortgage lending in 16 states, arranging FHA, VA, conventional and jumbo purchase and refinance loans through a wholesale lending network. Eligibility is determined by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB – Principal and Interest vs. Total Monthly Payment

2. Fannie Mae – FAQs: 97% LTV Options

3. Fannie Mae – Selling Guide B7-1-02, Mortgage Insurance Coverage Requirements

4. Fannie Mae – Eligibility Matrix

5. CFPB – Homeowners Protection Act Examination Procedures