Remortgage From Repayment to Interest Only

Why Would You Switch From Repayment to Interest Only?

Switching from a repayment mortgage to interest only is not a step most financial advisers would recommend as a default strategy. However, there are legitimate circumstances where it can be a sensible short-term measure or part of a broader financial plan.

Here are the most common reasons homeowners consider this switch:

• Short-term affordability pressure — If you are going through a period of reduced income, perhaps due to redundancy, illness, maternity or paternity leave, or a career change, switching to interest only temporarily can reduce your monthly outgoing significantly. This can provide breathing space while you get back on your feet.
• Managing cash flow — Some homeowners, particularly those who are self-employed or have irregular income, prefer to keep their fixed monthly commitments as low as possible and make capital repayments when cash flow allows, rather than committing to a higher fixed monthly repayment.
• Investment strategy — A smaller number of homeowners prefer to invest the difference between the interest only and repayment amounts in investments they believe will outperform the savings they would make by repaying the mortgage. This is a higher-risk strategy that requires careful consideration and ideally independent financial advice.
• Property investment purposes — If you own the property as a buy-to-let investment, interest only is the standard mortgage type. However, if this is your residential home, different rules and considerations apply.
• Nearing the end of the mortgage term — Some homeowners with substantial assets or a clear plan to sell the property may choose interest only for the final years of their mortgage, particularly if they intend to downsize.

Whatever the reason, it is critical to understand that switching to interest only means your mortgage balance will not reduce through your monthly payments. You will need a credible plan to repay the capital at some point, and lenders are required by the FCA to verify this plan before approving interest only borrowing.

How Much Could You Reduce Your Monthly Payments?

The payment reduction from switching to interest only can be substantial, which is why it appeals to homeowners facing financial pressure. However, it is important to understand that lower payments now come at a cost later.

Example: 250,000-pound mortgage at 4.5%

On a repayment basis over 20 years, your monthly payment would be approximately 1,581 pounds. On interest only, the same mortgage would cost approximately 938 pounds per month. That is a reduction of around 643 pounds, which is a significant monthly saving.

Example: 150,000-pound mortgage at 4%

On repayment over 25 years, you would pay approximately 792 pounds per month. On interest only, the monthly payment drops to approximately 500 pounds, a saving of around 292 pounds per month.

Important considerations:

• The capital remains unchanged — On interest only, your mortgage balance does not reduce. If you borrow 250,000 pounds, you will still owe 250,000 pounds at the end of the term, regardless of how long you have been paying. On repayment, that balance would be zero.
• Total interest paid is higher — Because the balance never reduces on interest only, you pay interest on the full amount for the entire term. Over a 25-year mortgage, the total interest paid on interest only is significantly more than on repayment, where the reducing balance means less interest accumulates over time.
• You need a repayment strategy — The money you save each month by being on interest only needs to be directed somewhere that will eventually allow you to repay the capital. If you simply spend the savings on lifestyle, you will face a very large debt at the end of the term with no way to clear it.

The payment reduction is real and can be genuinely helpful in certain circumstances. However, it is essential to view interest only as a financial tool that needs to be managed responsibly, not as a way to permanently reduce your housing costs without consequence.

FCA Requirements and Repayment Strategies

The Financial Conduct Authority has established clear rules around interest only mortgages to protect consumers. Any lender offering interest only borrowing on a residential mortgage must ensure the borrower has a credible repayment strategy. This is a fundamental part of the application process and cannot be bypassed.

What counts as a credible repayment strategy?

The FCA does not specify a prescriptive list, but lenders generally accept the following strategies:

• Sale of the mortgaged property — If you plan to sell the property and downsize or move to rented accommodation at the end of the term, this can be an acceptable strategy. The lender will want to see that the expected sale proceeds will be sufficient to clear the mortgage balance, typically requiring significant equity in the property.
• Sale of another property — If you own a second property, the proceeds from its sale may be used as a repayment strategy.
• Savings and investments — Regular savings, ISAs, investment portfolios, or other financial assets that are projected to accumulate enough to repay the balance. Lenders will typically want to see evidence that the savings or investments are on track.
• Pension lump sum — A tax-free lump sum from your pension pot can be used, provided the projected amount is sufficient to cover the mortgage balance.
• Other assets — In some cases, other assets such as inheritance expectations or business interests may be considered, though lenders tend to be more cautious about these.

Strategies that are generally not accepted:

• Relying on future property price increases alone
• Unspecified future income or windfalls
• Remortgaging again at the end of the term as the primary plan
• Relying on a partner's income or assets without formal arrangements

When applying for interest only, you will need to provide evidence of your chosen repayment strategy. Lenders may ask for valuations, investment statements, pension forecasts, or other documentation depending on the strategy you present. Being well prepared and having clear evidence to support your plan will significantly improve your chances of approval.

Lender Criteria for Interest Only Remortgages

Not all lenders offer interest only mortgages for residential properties, and those that do typically have stricter criteria than for standard repayment mortgages. Understanding these criteria before you apply will save you time and improve your chances of success.

Common lender requirements for residential interest only:

• Minimum property value — Many lenders set a minimum property value for interest only lending, often in the range of 300,000 to 500,000 pounds. This is because lenders want significant equity as security.
• Maximum loan-to-value — LTV limits for interest only are typically lower than for repayment mortgages. While you might borrow up to 90% or 95% LTV on repayment, interest only is usually capped at 50% to 75% LTV depending on the lender.
• Minimum loan amount — Some lenders set a minimum loan size for interest only, often around 25,000 to 100,000 pounds.
• Minimum income — Some lenders require a minimum household income for interest only borrowing, which can range from 50,000 to 100,000 pounds per year.
• Credible repayment strategy — As discussed above, you must demonstrate a clear and realistic plan for repaying the capital at the end of the term.
• Age limits — Lenders may have maximum age restrictions at the end of the mortgage term, though these vary significantly between providers.

Finding the right lender:

Because criteria vary so widely between lenders, working with a whole-of-market mortgage broker is particularly valuable when applying for interest only. A broker will know which lenders offer interest only residential mortgages and which ones are most likely to accept your specific circumstances, property value, LTV, and repayment strategy.

Some specialist lenders and private banks are more accommodating of interest only lending, particularly for higher-value properties and higher-net-worth borrowers. A broker with experience in this area can open doors that would not be available through a direct approach to a high street lender.

It is worth noting that interest only lending on buy-to-let properties is treated differently, with most buy-to-let lenders offering interest only as standard. If the property in question is a buy-to-let rather than your primary residence, the criteria are typically less restrictive.

Risks and Considerations of Switching to Interest Only

Before making the decision to switch from repayment to interest only, it is essential to fully understand and accept the risks involved. While the lower monthly payments are attractive, the long-term implications can be significant.

Your mortgage balance does not reduce

This is the most fundamental risk. On a repayment mortgage, every payment brings you closer to owning your home outright. On interest only, no matter how many payments you make, you will still owe the same amount at the end of the term. If your repayment strategy falls short, you could face serious financial difficulty.

Higher total interest cost

Because the capital never reduces on interest only, you pay interest on the full balance for the entire mortgage term. Over 25 years, this can mean paying tens of thousands of pounds more in interest compared to a repayment mortgage.

Repayment strategy risk

Investment returns are not guaranteed, property values can fall as well as rise, and personal circumstances can change. If your chosen repayment strategy does not perform as expected, you may not have sufficient funds to clear the mortgage when the term ends.

Reduced equity growth

On a repayment mortgage, your equity increases both through capital payments and property value growth. On interest only, your equity only increases if the property value rises. In a flat or declining market, your equity position does not improve at all.

Future remortgage challenges

As the mortgage market has tightened its criteria around interest only lending, finding competitive deals when you next need to remortgage may be more difficult. If your circumstances change or the market shifts, your options could be more limited than you expect.

Impact on retirement planning

If your mortgage term extends into retirement, you will need to fund the interest only payments from your retirement income. You will also still face the capital repayment. This can place significant strain on retirement finances and may limit your lifestyle options.

None of these risks mean that interest only is never appropriate. However, they do mean that the decision should be made with full awareness of the implications, ideally with independent financial advice, and with a robust repayment strategy firmly in place.

Making Interest Only Work: Practical Strategies

If you have carefully considered the risks and decided that switching to interest only is the right move for your circumstances, here are some practical strategies to help ensure you manage it responsibly and protect your long-term financial position.

Treat the saved amount as a commitment

Calculate the difference between your repayment and interest only payments and commit to saving or investing that amount regularly. If your repayment mortgage cost 1,200 pounds per month and your interest only costs 700 pounds, set up a standing order for the 500-pound difference into a savings account, ISA, or investment vehicle. This discipline ensures the money is being put towards your capital repayment strategy rather than being absorbed into general spending.

Review your strategy annually

At least once a year, check whether your repayment strategy is on track. If you are saving or investing, review the balance and projected growth. If your strategy is based on property sale, check current market values. If you are falling behind, take corrective action early rather than leaving it to the last moment.

Consider making voluntary capital repayments

Most interest only mortgages allow you to make overpayments towards the capital, usually up to 10% of the balance each year without penalty. Even occasional lump sum payments can make a meaningful difference to the balance you owe at the end of the term.

Have a contingency plan

What will you do if your primary repayment strategy does not work out? Having a backup plan, whether that is downsizing, using other assets, or switching back to repayment, gives you options and reduces the risk of being caught out.

Seek regular advice

Given the complexity of managing an interest only mortgage alongside a repayment strategy, periodic reviews with a qualified financial adviser can be very valuable. They can assess whether your strategy remains suitable, suggest improvements, and help you adjust course if needed.

Consider switching back to repayment when circumstances improve

If your reason for switching to interest only was a temporary financial difficulty, plan to switch back to repayment as soon as your situation improves. The sooner you return to paying down the capital, the better your long-term position will be.

Interest only can be a useful financial tool when used thoughtfully and with proper planning. The key is to never treat it as free money, but rather as a temporary arrangement that requires active management and a clear exit strategy.