Rolling a car loan into your mortgage

The question that matters is what the car loan costs inside the new loan. A car loan with a few years left gets paid off on its own schedule. Inside a mortgage, the same balance gets spread over the mortgage term you pick. This post shows how to see that on the BankPricer Debt Consolidation tab by running it twice, once with the car loan and once without it.

How the tab treats a car loan

The Debt Consolidation tab adds up every row you list into Total Debt, then figures one Consolidated Payment on that total at the New Single Rate on Consolidated Loan over the Consolidated Loan Term you pick. Source: bankpricer.com/mortgage-calculator, Debt Consolidation tab, read 2026-11-03 The term menu has 30, 20, 15, and 10 years.

When you pick Auto Loan from a row's menu, the row fills in sample numbers and sets Payment Type to "Use actual/min payment." That means Current Combined Payments counts the Monthly Payment you type for the car. Source: bankpricer.com/mortgage-calculator, read 2026-11-03

Lifetime Interest Difference works a little differently. For each current debt, it figures the interest left from the row's Balance, APR / Rate, and Remaining Term (years). It then compares that total to the interest on the new loan over the Consolidated Loan Term. The line ends in "saved" when the new loan costs less interest and "more" when it costs more.

Step by step: run it twice

1. Open the Debt Consolidation calculator.
2. The tab opens with sample rows. Replace them with your own debts, or remove a row with the x button. If the new loan would replace your mortgage, keep a 1st Mortgage row with your current balance.
3. Add a row and pick Auto Loan. Type the Balance, the APR / Rate, and the Monthly Payment from your latest car loan statement.
4. Type the years left on the car loan in Remaining Term (years). The field takes whole years. If you leave it empty, the tab uses 30 years, which can make the car loan's remaining interest look much larger than it is.
5. Type the rate from your own quote in New Single Rate on Consolidated Loan and pick a Consolidated Loan Term.
6. Write down Current Combined Payments, Consolidated Payment, Monthly Savings, and Lifetime Interest Difference.
7. Remove the Auto Loan row with the x button. Leave everything else the same.
8. Write down the same four lines again.

Read the difference, not the headline

The first run tells you what happens to everything together. The second run tells you what happens without the car. The gap between the two runs is what the car loan adds.

Look at Consolidated Payment first. The increase from the second run to the first run is the part of the new mortgage payment that pays for the car.

Then look at Lifetime Interest Difference in both runs. If adding the car moves the line toward "more," the car loan costs more interest inside the mortgage than it would on its own schedule. That can happen even when Monthly Savings goes up, because the balance is paid over more months. We showed the same pattern for credit cards in lower monthly, more interest after the cards are rolled in.

In its guidance on consolidating credit card debt, the CFPB makes the same point: "Although your monthly payment might be lower, it may be because you're paying over a longer time." Source: CFPB, "What do I need to know about consolidating my credit card debt?"

Try one more pair of runs with a shorter Consolidated Loan Term. Watch how the payment and the interest line move against each other.

Check your blended rate too

The tab also shows Your True Blended Rate, which it describes as "what you're really paying across all of them, weighted by balance." Source: bankpricer.com/mortgage-calculator, read 2026-11-03 Watch how it moves when you add or remove the car row, then compare it to the rate you were quoted. We covered that read in your true blended rate before you consolidate debt.

What the tab leaves out

The Debt Consolidation tab has no field for closing costs or loan fees. When it shows a small monthly savings, its own note says to "weigh against closing costs." Source: bankpricer.com/mortgage-calculator, read 2026-11-03 Get those costs from your quote.

It also can't tell you what changes when a car loan becomes part of a loan on your home. The CFPB's guidance on using home equity to consolidate debt lists a few things to weigh:

• "If you don't pay back the loan, you could lose your home in foreclosure."
• "You may also have to pay closing costs with a home equity loan."
• If you use your home equity to pay off other debt, "it may not be available in an emergency or for expenses like home renovations or repairs."

Source: CFPB, "What do I need to know about consolidating my credit card debt?"

FAQ

Will rolling my car loan into my mortgage lower my payment?

It can lower the combined payment when the balance is spread over a longer term. Whether it lowers the total you pay is a separate question. Run the tab with and without the Auto Loan row and compare Lifetime Interest Difference to see both answers for your own numbers.

What if my car loan has only a short time left?

Type the exact years left in Remaining Term (years). The fewer years left, the less interest the car loan has left to charge on its own schedule, so it has less to gain from a longer loan. The with-and-without runs show you how that plays out for your balance and rate.

Why doesn't the tab show my exact payment?

The tab uses only what you type: balances, rates, payment types, and terms. It doesn't include taxes, insurance, fees, or closing costs. The numbers you can rely on come from a lender's written quote. For most mortgages, the lender must deliver or mail a Loan Estimate within three business days after receiving the six pieces of information that make up an application. Source: CFPB, "What is a Loan Estimate?"

One thing to do

Jeff Shin, Mortgage Loan Originator, NMLS #1041652. Chicago. Equal Housing Lender. Not a commitment to lend.