Debt Consolidation Mortgages: Two Numbers, Not One
Rolling credit cards and car loans into a mortgage lowers the monthly payment and usually raises the lifetime cost. Here is how to run both numbers before you decide.
Consolidating debt into your mortgage does one thing: it moves balances from several short-term loans into one long-term loan secured by your house. Everything else — the lower payment, the single due date, the improved cash flow — follows from that one move.
So does the part nobody puts on the landing page.
The number you get shown
Say you owe $18,000 on credit cards at 22.9%, paying $540 a month. A $21,000 car loan at 7.4%, paying $465. And $14,000 in student loans at 6.1%, paying $180.
That is $53,000 of debt and $1,185 a month.
Roll it into a mortgage at 6.75% over thirty years, with $2,500 of costs added, and the payment on that $55,500 becomes about $360 a month.
You just freed up $825 a month. That is a real number and it is the one every consolidation pitch leads with.
The number you do not
Left alone, those three debts clear in roughly four and a half, four and a half, and eight years. The total interest still to pay across all three is about $18,400.
The new loan costs about $74,100 in interest over thirty years.
Consolidating saves $825 a month and costs about $55,700 more in interest. Both of those are true at the same time, and the second one only appears if you go looking for it.
Nothing dishonest happened. A credit card at 22.9% is expensive per year but it clears fast. A mortgage is cheap per year and runs for three decades. Stretch a four-year balance across thirty and the total goes up even though the rate went down.
(These figures are an illustration, not a quote. Your own numbers will differ.)
What turns this from a cost into a strategy
Pay the saving back.
If you consolidate and then send that $825 a month into the new loan as extra principal, the balance clears in years rather than decades and the lifetime cost collapses. You get the flexibility of a low required payment with the economics of a fast payoff — and if a month goes badly, the required payment is still only $360.
That is the version of this that works. The version that does not is treating the $825 as found money.
Second mortgage or cash-out refinance
These are not the same decision.
A cash-out refinance replaces your existing mortgage. Every dollar of it gets priced at today's rate, not just the new money. If your current mortgage is at 3.25% and the new one would be at 6.75%, you have just re-priced the entire balance to consolidate $53,000. That is usually the wrong trade, and it is the most common expensive mistake in this category.
A second mortgage or HELOC leaves the first loan exactly where it is and sits behind it. The rate on the second is higher than a first would be, but it applies only to the consolidated amount. When the existing mortgage is at a low rate, this is almost always the better structure.
Run both. The calculator on this site does the comparison.
The part that is not about money
Credit cards are unsecured. If everything goes wrong, the consequences land on your credit report.
A mortgage is secured by your home. Consolidate, and debts that could previously cost you a credit score can now cost you the house. For most borrowers that risk is remote and worth taking for the cash flow. It should still be a decision you make deliberately rather than one you discover later.
When it is clearly the right call
- The freed-up cash flow is going straight back into the loan as extra principal.
- You have equity, a low rate on your first mortgage is not being disturbed, and a second-position loan does the job.
- The monthly payment is the actual constraint — a business that needs working capital, a household absorbing a change in income, a period where flexibility matters more than total cost.
- Card balances are high enough to be affecting your credit utilisation, and clearing them changes what else becomes possible.
When to slow down
- The plan is to spend the monthly saving.
- The cards will be used again once they are paid off. Consolidation without a change in behaviour produces the same card balances plus a larger mortgage.
- Your first mortgage is at a rate well below current pricing and the only structure being offered is a full refinance.
What a lender looks at
Equity, credit, and the debt-to-income ratio after consolidation rather than before — which is often the point, since clearing several payments can change the ratio substantially.
We are brokers, so this goes across hundreds of wholesale lenders rather than one rate sheet. Second-position pricing in particular varies enormously between lenders, and it is one of the places shopping a file makes a real difference to the structure available.
Does this apply to your situation?
Twelve questions, no credit check, and no email required. See which programs are commonly used for situations like yours.
If your first mortgage is at a low rate, a cash-out refinance is usually the wrong move. Here is how second-position financing compares.
The key details every homeowner should understand before refinancing — rate, term, equity, costs, and timing.
Talk through your scenario.
Start an application or book a 20-minute call.