Can You Get a Mortgage With Credit Card Debt? (UK Reality Check)

Many people approaching a mortgage application carry some level of credit card debt. Whether that debt affects the outcome of a mortgage application — and how — depends on a regulated assessment process governed by UK financial rules. This article explains how that process works, what role credit card debt plays within it, and what the relevant regulatory framework actually requires.

This guide explains how the system works. It does not provide financial advice or predict individual outcomes.

There is no law or regulation in the UK that prohibits obtaining a mortgage while holding credit card debt. The Financial Conduct Authority (FCA) does not bar lenders from approving applications from people who carry credit card balances.

What the rules do require is that lenders conduct a thorough affordability assessment before any mortgage is agreed. Credit card debt is formally classified as a "credit commitment" — a category of committed expenditure — and must be factored into that assessment. How lenders calculate and weight those commitments varies between providers, because the FCA's rules are principles-based rather than prescriptive.

The core question the system asks is not whether credit card debt exists, but whether, after accounting for it alongside other expenditure and income, the mortgage remains affordable.

Mortgage lending in the UK is regulated through two primary bodies. The Financial Conduct Authority (FCA) governs conduct through the Mortgage and Home Finance: Conduct of Business Sourcebook, commonly referred to as MCOB. The Prudential Regulation Authority (PRA), which operates as part of the Bank of England, sets prudential standards including limits on how much high loan-to-income lending a firm can carry out.

Together, these two regulatory frameworks shape what lenders must do before agreeing a mortgage — and how credit card debt fits into that picture.

The Affordability Assessment

Under MCOB 11.6.2R, lenders are required to conduct an affordability assessment before entering into a regulated mortgage contract. This assessment must take full account of the applicant's income and expenditure. Lenders must take reasonable steps to verify income; they cannot rely solely on what the customer states.

Expenditure is divided into categories. Under MCOB 11.6, lenders must assess affordability taking into account the customer's committed expenditure, including credit commitments such as credit cards and loans. This means credit card debt is not treated as optional spending. It is formally included as a commitment that reduces the amount of income available to service a new mortgage.

Credit Reference Checks

Separately from the income and expenditure calculation, lenders are required to obtain information from credit reference agencies where appropriate. This check gives lenders visibility of the applicant's credit history, including outstanding balances, payment behaviour, and utilisation of available credit limits. We recommend periodically downloading your statutory credit report to ensure the balances the lenders see are completely accurate.

Interest Rate Stress Testing

Under MCOB 11.6, lenders must assess affordability taking into account the impact of potential future interest rate increases. The specific stress rate assumptions are determined by each lender. All mortgages require affordability assessment; lenders may apply different stress rate assumptions depending on the mortgage product and fixed period.

Consumer Duty

From 31 July 2023, all mortgage lending activities have also been subject to the Consumer Duty (FCA Handbook PRIN 2A). This requires firms to avoid causing foreseeable harm to customers and to support them in making informed decisions. The Duty operates as an overarching principle that reinforces — rather than replaces — the specific affordability requirements in MCOB.

Loan-to-Income (LTI) Flow Limit

The PRA requires lenders to restrict mortgages at or above 4.5 times the applicant's gross annual income to no more than 15% of their new mortgage lending. This is known as the LTI flow limit. It does not mean that lending above 4.5x is prohibited — it means lenders must manage their overall portfolio so that high-LTI lending does not exceed that proportion of total new lending.

From 11 July 2025, the de minimis threshold for this rule increased from £100 million to £150 million per four rolling quarters. Lenders whose regulated mortgage lending falls below this threshold are not subject to the 15% LTI flow limit. The LTI framework is currently under regulatory review, and interim modifications available until 30 June 2026 (or earlier if rules change) allow some lenders to exceed the 15% limit temporarily.

Some lenders offer Loan-to-Income multiples of up to 5x or 5.5x for certain applicant profiles, but 4.5x remains the baseline threshold at which the high-LTI classification applies.

Debt-to-Income (DTI) Considerations

Some lenders apply informal Debt-to-Income (DTI) ratios as part of their affordability modelling. Figures such as 36% of gross income as a maximum for total debt (including the mortgage), or 28% for mortgage payments alone, are referenced in published lender and consumer guidance. These are not statutory requirements under FCA or PRA rules, and implementation varies significantly between providers. Exact thresholds, where used, are a matter of individual lender policy rather than regulatory mandate.

Credit Utilisation

According to published consumer guidance, lenders may view high credit card utilisation — broadly, using a substantial proportion of available credit limits — as a negative indicator when assessing financial behaviour. Some guidance references figures in the range of 20–25% of available credit limit as a general threshold, though this varies by lender and is not set out in FCA rules. If you are struggling with high utilisation, you may want to review our broader debt guides.

Modified Affordability Assessment

Under MCOB 11.9, a Modified Affordability Assessment may be available for certain remortgage customers, subject to eligibility criteria. To qualify, the customer must have a current mortgage, be up to date with payments over the preceding 12 months, not be increasing their borrowing (except to cover fees), and be switching on the same property. The new mortgage must be more affordable than the current mortgage or the best deal available from the current lender.

"I have credit card debt, so I will be rejected."

This is not accurate as a general statement. There is no statutory prohibition on obtaining a mortgage while holding credit card debt. What the rules require is that lenders assess affordability — which includes accounting for credit card commitments. Whether a specific application is approved is a matter for the individual lender's assessment of that applicant's overall financial position, and lenders have discretion in how they conduct that assessment within the principles-based FCA framework.

"Lenders all calculate credit card debt the same way."

In practice, this may not be the case. Some lenders base their calculations on the minimum monthly payment; others apply an assumed percentage of the outstanding balance (varying broadly in the range of 3–5%); others may use the actual payment history. The FCA's rules do not prescribe a specific calculation method, which means variation between lenders is permitted. The principles-based approach means that what matters is whether the overall assessment is reasonable — not that every lender uses the same formula.

"The 4.5x income cap is a legal maximum."

The 4.5x LTI threshold is not an absolute legal cap on what any individual can borrow. It is the level at which a mortgage is classified as "high-LTI" for the purpose of the PRA's portfolio flow limit. Lenders are permitted to lend above 4.5x; they are required to ensure that such lending does not represent more than 15% of their new mortgage lending overall. Some lenders offer higher income multiples in certain circumstances.

"Five-year fixed mortgages avoid stress testing entirely."

All mortgages require an affordability assessment. Lenders may apply different stress rate assumptions depending on the mortgage product and fixed period, but the obligation to assess affordability — including the potential impact of future rate changes — applies across mortgage types.

Second Charge Mortgages and Bridging Loans

Certain product types — including second charge mortgages and bridging loans — have different affordability assessment requirements under the exclusions in MCOB 11.6.3R. Specific variations and term extensions may be permitted without a full affordability assessment under defined conditions.

Interest-Only Mortgages

Interest-only mortgages are subject to additional requirements beyond the standard affordability assessment. Lenders must verify that the applicant has a credible strategy for repaying the capital at the end of the mortgage term. In practice, many lenders apply lower maximum Loan-to-Value ratios (typically a maximum of around 75%) and higher minimum income thresholds for interest-only products, though these are commercial policies rather than statutory requirements.

Remortgages Under Modified Affordability Assessment

Customers switching to a new lender under the MAA framework may undergo a reduced affordability check rather than a full assessment, provided all qualifying conditions under MCOB 11.9 are met.

Smaller Lenders Below the De Minimis Threshold

Lenders whose regulated mortgage lending falls below £150 million per four rolling quarters (from July 2025) are not subject to the 15% LTI flow limit. This means the high-LTI restriction applies differently — or not at all — depending on the size and lending volume of the provider.

The UK mortgage affordability framework treats credit card debt as a formal commitment that must be accounted for in any regulated assessment. It is not ignored, and lenders are not permitted to disregard it when calculating whether a mortgage is affordable. At the same time, the rules do not create an automatic barrier based on the existence of credit card debt. What matters to the regulatory framework is whether the overall assessment — across income, all committed expenditure, and stress-tested interest rates — produces a result that the lender can demonstrate to be responsible. A soft credit search conducted at the Agreement in Principle (AIP) phase will reveal these commitments, allowing the lender to run their calculations early on.

Because the FCA's affordability rules are principles-based rather than prescriptive, lenders have significant discretion in how they model and weight credit card commitments. This means that the same credit card balance may be treated differently by different lenders, calculated using different assumptions, and weighted differently in the overall affordability picture. The regulatory framework sets the obligation to assess; it does not specify a single formula for doing so.

The PRA's LTI flow limit is a portfolio-level constraint, not an individual eligibility rule. Its effect is felt in how lenders manage their overall lending mix rather than as a direct ceiling on what any individual may borrow.

The UK regulatory framework does not prohibit mortgage lending to applicants who hold credit card debt. What it requires is that lenders conduct a thorough affordability assessment under MCOB 11.6 in which credit card debt is formally classified as committed expenditure and factored into the income-minus-expenditure calculation.

Mortgage affordability in the UK is assessed under a principles-based FCA framework, which means lenders have discretion in how they model credit card commitments. This results in variation between providers in how the same balance may be calculated and weighted.

The 4.5x Loan-to-Income threshold is a portfolio-level regulatory trigger — not an absolute cap on individual borrowing. Lenders must limit high-LTI lending to 15% of new mortgage lending overall, not refuse all applicants above the threshold.

Under MCOB 11.6, lenders must assess the impact of potential future interest rate increases as part of affordability. The specific stress rate assumptions applied are determined by each lender. All mortgages require affordability assessment, though stress rate assumptions may vary by product type and fixed period.

Certain remortgage customers may qualify for a Modified Affordability Assessment involving reduced checks under MCOB 11.9, subject to specific eligibility criteria.

The Consumer Duty, in force from 31 July 2023, places an overarching obligation on lenders to avoid foreseeable harm and to support customers in making informed decisions throughout the mortgage process.