Refinance Jumbo Loan at 90 LTV? Costs and Options

A 90% loan-to-value (LTV) jumbo refinance may be possible, but it is not available on every loan: lender requirements, property details, loan purpose, and borrower finances determine whether an application qualifies. This calculator estimates your new monthly principal-and-interest payment and total interest from the loan amount, APR, and term; it does not determine eligibility or whether a loan meets a lender’s jumbo definition.

Formula

The calculator estimates the level monthly payment on a fixed-rate, fully amortizing loan. It uses:

• Monthly rate, r = APR ÷ 1,200, where APR is entered as a percentage per year.
• Number of monthly payments, n = loan term in years × 12.
• Monthly payment = P × r ÷ [1 − (1 + r)⁻ⁿ], rounded to the nearest cent.
• Total interest = rounded monthly payment × n − P.

P is the new loan’s assumed principal in dollars, r is the monthly interest rate as a decimal, and n is the number of payments. The APR and term are entered in percent per year and years, respectively. The payment excludes property taxes, homeowners insurance, mortgage insurance, escrow deposits, and closing costs.

Worked Example

Using the calculator’s default inputs—an $800,000 loan, 7% APR, and a 30-year term:

1. Convert the APR to a monthly rate: 7 ÷ 1,200 = 0.0058333333.
2. Convert the term to payments: 30 × 12 = 360.
3. Apply the payment formula: $800,000 × 0.0058333333 ÷ [1 − (1.0058333333)⁻³⁶⁰] = about $5,322.69 per month.
4. Calculate total interest using the rounded payment: $5,322.69 × 360 − $800,000 = $1,116,168.40.

The result is principal and interest only. A real refinance quote may include different loan terms, fees, prepaid expenses, or other amounts that change the payment or cash required at closing.

What 90% LTV Means for a Jumbo Refinance

LTV compares the amount borrowed with the property’s value. At 90% LTV, the proposed loan equals 90% of the value used for the lender’s calculation. For example, if an appraisal supports a value of $1,000,000, a $900,000 loan would be 90% LTV before considering any lender-specific adjustments. The same loan amount against a $1,100,000 value would be about 81.8% LTV.

“Jumbo” generally refers to a mortgage that exceeds the applicable conforming loan limit, but the relevant limit depends on the property location and loan circumstances. A 90% LTV request does not by itself establish that a loan is jumbo—or that a lender will offer that LTV. Lenders set their own product and underwriting criteria, which can differ by occupancy, property type, loan purpose, loan size, and borrower profile. Ask the lender how it defines the product and calculates value and LTV for your case.

How to Assess a Refinance Scenario

Start with the loan amount you expect to finance, not just the unpaid principal on your existing mortgage. A refinance may involve costs or other balances, and whether they are paid separately or included in the new loan affects the amount borrowed and LTV. Ask for an itemized estimate rather than assuming every cost can be rolled into the loan.

• Estimate the property value, then divide the proposed loan amount by that value and multiply by 100 to calculate LTV.
• Separate the payoff amount from closing costs, prepaid items, and any cash-out amount.
• Enter the proposed loan amount, APR, and term in the calculator to estimate principal and interest.
• Compare the estimate with a lender’s written terms, including fees, payment details, and any mortgage insurance or escrow requirements that apply.

For instance, a $900,000 proposed loan on a $1,000,000 assumed value is 90% LTV. If the loan amount rises to $930,000 while the value stays the same, LTV becomes 93%. If an appraisal comes in below the assumed value, the calculated LTV also rises. These arithmetic examples do not imply that either scenario is available to a borrower.

Costs, Qualifications, and Common Obstacles

High-LTV jumbo refinancing can be constrained by a lender’s product rules and underwriting review. A lender may assess income, existing obligations, assets, credit history, reserves, property characteristics, occupancy, and the purpose of the refinance. The required documentation and treatment of those factors vary; no calculator can establish approval.

Closing costs can include charges for services and other transaction expenses. The precise items and amounts depend on the transaction and lender. If costs are added to the loan, they increase the balance and may raise both LTV and monthly payment. If paid separately, they still affect the cash needed to complete the refinance. Request a written breakdown and ask which figures are estimates and which are final.

Another common misconception is that a higher home value automatically makes a 90% LTV refinance available. The value used for underwriting may be determined through an appraisal or another process selected by the lender, and a borrower’s estimate is not necessarily accepted. A borrower may also have substantial equity but still not meet a lender’s requirements for income, documentation, reserves, or the particular loan product.

Alternatives and Questions to Ask

If a lender does not offer the requested LTV, possible next steps depend on the borrower’s goals and circumstances; this is not a recommendation to pursue any particular option. A borrower can ask whether a different loan amount or structure is available, whether costs must be paid upfront, or whether waiting and paying down principal would change the LTV calculation. A home-equity loan or line of credit is a separate borrowing arrangement with its own terms and qualification requirements, not an automatic substitute for a refinance.

Useful questions for a lender include: What value and loan amount are being used to calculate LTV? Is the product classified as jumbo under your criteria? What is the complete estimated amount due at closing? Does the quoted payment include taxes, insurance, or mortgage insurance? What assumptions could change the quote? Obtain the figures in writing so you can compare like with like.

Frequently Asked Questions

Can you refinance a jumbo loan at 90% LTV?
Some lenders may offer refinance products that allow a high LTV, but availability and conditions vary. A 90% LTV request is not a guarantee of approval or a universal jumbo-loan limit.

How do I calculate 90% LTV?
Divide the proposed loan amount by the property value used in the calculation, then multiply by 100. A $900,000 loan divided by a $1,000,000 value equals 90%.

Does a 90% LTV refinance mean I can take cash out?
Not necessarily. Cash-out eligibility and limits depend on the lender’s product and underwriting rules. Ask how any requested cash, payoff balance, and transaction costs affect the loan amount and LTV.

Will this calculator tell me whether I qualify?
No. It estimates principal-and-interest payments and total interest from your inputs. It does not assess credit, income, property value, loan limits, lender policies, or approval.

Does the payment include closing costs, taxes, or insurance?
No. The calculation includes only the assumed loan principal and interest under a fixed APR and term. Request a lender estimate for closing costs, taxes, insurance, and any other charges.

Assumptions

• The APR and payment remain fixed for the full term.
• Payments are monthly, with the first payment one month after borrowing.
• Interest compounds monthly at APR ÷ 12.
• Fees, taxes, insurance, mortgage insurance, and escrow are not included.

This result is an estimate; the lender’s disclosure gives the exact figures.

Related

• Down Payment to Refinance a Personal Loan?
• Commonwealth Refinance Personal Loan Calculator
• Cost No Refinance Loan? Estimate the Payment Difference

in p | New loan amount | $ | 800000 | 1 | 100000000
in apr | Interest rate (APR) | % | 7 | 0.01 | 100
in yrs | Loan term | years | 30 | 0.0833 | 50
out pmt | Monthly principal and interest | $ | round(p * (apr / 1200) / (1 - (1 + apr / 1200) ^ -(yrs * 12)), 2) | 2
out int | Total interest | $ | pmt * yrs * 12 - p | 2