Your first home starts with a plan
A practical guide to the numbers, the process, and your next big step.
Read the guideSecond mortgages: who they may help and how they work
A second mortgage is another loan secured by a home that already has a mortgage. It adds a separate repayment obligation while the first loan remains in place. Homeowners may consider it when they need additional funds and want to compare borrowing against their equity with replacing their existing mortgage or using another type of financing.
“Second” describes the loan’s lien position, not a mortgage on a second property. As the CFPB explains in its guide to second mortgages, the first mortgage generally has priority over the junior loan when proceeds are distributed after a foreclosure sale. Both loans are secured by your property.
Why might a homeowner consider a second mortgage?
Possible uses include funding a planned renovation, covering a major expense, or consolidating other debts. A fixed loan amount and repayment schedule can help compare a defined project with your monthly budget. Borrowing still creates a new cost: available equity is not free money. The OCC’s home equity loan overview describes common uses of this borrowing.
Keeping an existing first mortgage may be a reason to compare a second loan with refinancing. That does not automatically make it cheaper. Compare the rate, term, fees, and repayment cost of the added loan with the cost of replacing the first mortgage. Our refinance calculator provides a separate scenario for that comparison.
Home equity loans and HELOCs work differently
A home equity loan generally provides a lump sum. A HELOC provides a credit line, and its draw and repayment arrangements can differ from a standard installment loan. Either can be a second mortgage when a first mortgage is already in place. See the CFPB’s comparison of home equity loans and HELOCs. This calculator models a fixed-rate, fully amortizing loan, rather than a revolving credit line, interest-only period, or balloon payment.
Check both the payment and the full borrowing cost
Enter the amount you intend to borrow, a quoted annual interest rate, the repayment term, and closing costs paid upfront. Add the principal and interest portion of your current first mortgage to see the combined monthly P&I. Keep property taxes, insurance, HOA fees, and maintenance in your household budget separately; they are not included in that combined figure.
For example, a $50,000 second mortgage at an illustrative 8% fixed rate over 15 years has a monthly payment of about $477.83. With an existing $2,000 first-mortgage P&I payment, the combined amount is about $2,477.83. Including $2,000 in upfront closing costs, the modeled second loan total cost is approximately $88,009. These are examples, not loan offers.
Equity and approval are separate questions
This payment calculator does not determine whether a lender will approve the amount. Your property value, existing secured debt, credit, income, and lender requirements affect borrowing availability. The home equity calculator can illustrate a borrowing limit under a chosen combined loan-to-value assumption, but it also does not provide an approval.
Consider the risk before adding another secured loan
A second mortgage puts your home behind another repayment commitment. Missing payments can put the property at risk, even if you keep paying the first mortgage. Using it to repay unsecured debt changes the collateral risk. Compare alternatives, keep room for unexpected costs, and review the actual disclosures before signing. The FTC’s guide to borrowing against home equity explains costs and risks to consider. Use this estimate for planning; it is not personalized financial advice or a lending commitment.
