Adding unsecured debts such as personal loans or credit cards to your mortgage reduces monthly payments by spreading repayment over the mortgage term, but converts unsecured debt into debt secured against your home. If you cannot pay, your home is at risk. The FCA requires lenders to conduct a full affordability re-assessment before agreeing to any debt consolidation remortgage. (Source: FCA MCOB 11)
| Key fact | Detail |
|---|---|
| FCA re-assessment requirement | Full affordability check required under MCOB 11 even if staying with same lender |
| Interest rate difference | Mortgage rates (3-6%) vs personal loan rates (6-15%) vs credit card (20-30%) |
| Total interest trap | A £10,000 loan at 8% over 3 years costs £1,267 interest. The same £10,000 added to a 20-year mortgage at 5% costs £5,680 in interest |
| Secured vs unsecured | Secured debt — your home can be repossessed. Unsecured — lenders can pursue you but cannot take your home automatically |
| ERC consideration | Early repayment charges may apply on your current mortgage deal before consolidating |
How Debt Consolidation Remortgage Works
To add debts to your mortgage you typically remortgage to a higher loan amount with a new or existing lender. The additional funds pay off your unsecured debts at completion. You then have a single larger mortgage payment instead of multiple debt payments. Alternatively, some lenders offer a further advance on your existing mortgage without a full remortgage — this is quicker but you may pay a higher rate on the further advance portion.
The Total Interest Cost Calculation — Why It Usually Costs More
The key financial reality of debt consolidation is that spreading repayment over a longer term, even at a lower rate, almost always results in paying more total interest:
| Debt scenario | Balance | Rate | Term | Total interest |
|---|---|---|---|---|
| Personal loan (keep separate) | £15,000 | 8% | 4 years | £2,588 |
| Credit card (keep separate) | £5,000 | 20% | 3 years (min payment) | £3,200 est. |
| Both added to mortgage | £20,000 | 5% | 18 years remaining | £10,450 |
In this example, consolidating saves approximately £290/month in payments but costs £4,662 more in total interest. The monthly saving is real and may be necessary if you are struggling — but the long-term cost is significantly higher.
When Debt Consolidation Makes Financial Sense
Despite the total interest cost, consolidation can be the right choice in specific circumstances:
- You are currently missing payments on unsecured debts and consolidating stops further defaults damaging your credit file
- The monthly payment reduction is necessary to maintain your mortgage payments
- You have significant high-rate debt (credit cards at 20-30%) and plan to overpay the mortgage to repay the consolidated amount quickly
- You are in genuine financial distress and free debt advice has recommended it as the best available option
FCA Affordability Re-Assessment — What to Expect
Under FCA MCOB 11.6, lenders must conduct a full affordability assessment when you remortgage to a higher amount, even if you are staying with the same lender. This means:
- Full income verification — payslips, P60, bank statements
- Credit check — any deterioration in your credit profile since your original mortgage may affect the rate offered or result in refusal
- Stress testing the higher new payment at a rate 3% above the product rate
- Assessment of your total committed expenditure including the debts you are seeking to consolidate
If your income has fallen or your credit profile has worsened since your original mortgage, you may not qualify for a consolidation remortgage even if you have significant equity.
Early Repayment Charges — Check Before Acting
If you are within a fixed or discounted rate period, your mortgage will likely have an early repayment charge (ERC) for redeeming early. ERCs are typically 1-5% of the outstanding balance. On a £200,000 mortgage a 3% ERC costs £6,000. Check your mortgage terms or annual statement for the ERC amount and expiry date before proceeding with a consolidation remortgage — the ERC may outweigh the benefit of consolidating.
Alternatives to Consider First
- Balance transfer credit card — move high-rate card debt to 0% for 12-30 months. No security required and much lower total cost if paid off within the 0% period
- Money transfer card — move credit card debt into your bank account at 0% for a fee
- Debt management plan (DMP) — free from StepChange. Freezes interest on unsecured debts and creates a single manageable payment without securing against your home
- Personal loan switch — if your credit score allows, a personal loan at 6-8% is significantly cheaper than adding to a 20+ year mortgage
This article is for information only and does not constitute financial or legal advice. Consult a qualified adviser for guidance tailored to your situation. Check the FCA register at register.fca.org.uk before dealing with any financial firm.
Frequently Asked Questions
Can my lender refuse to let me add debts to my mortgage?
Yes. Lenders are not obliged to agree to debt consolidation remortgages and will refuse if the affordability assessment fails, your loan-to-value is too high, your credit score has deteriorated, or the property value has fallen. If refused by your current lender you can approach others but a whole-of-market broker is best placed to identify who will lend.
Does adding debts to my mortgage affect my interest rate?
The rate on the new total mortgage will depend on your loan-to-value and the deals available. If adding the debts pushes your LTV above a threshold (say from 60% to 75%) you will likely pay a higher rate on the entire balance, not just the additional amount. Model the full cost before proceeding.
What happens to my unsecured debts once they are consolidated?
They are repaid at completion — the lender sends the funds to your solicitor who pays each creditor directly. The accounts are then closed. Confirm this is how your lender handles it — some give funds to you to repay debts yourself, which introduces the risk of not repaying and having both the larger mortgage and the original debts outstanding.
Is debt consolidation available on interest-only mortgages?
Most lenders do not offer interest-only on debt consolidation remortgages. The FCA's responsible lending requirements mean most lenders require a repayment vehicle if any part of the mortgage includes consolidated debt. Check with each lender.
Sources
- FCA MCOB 11 — Responsible Lending: handbook.fca.org.uk
- MoneyHelper Debt Consolidation: moneyhelper.org.uk
- StepChange Debt Charity: stepchange.org
