The pros and cons of long-term fixed-rate mortgages (7- and 10-year fixes)

What is a long-term fixed-rate mortgage?

A long-term fixed-rate mortgage is a deal where your interest rate is fixed for a longer period than the more common 2- or 5-year terms. In the UK, “long-term” is often used to describe 7-year and 10-year fixed-rate mortgages.

During the fixed period, your interest rate stays the same. For a repayment mortgage, this is designed to make your monthly payments more predictable, even if wider interest rates move.

Why long-term fixed rates are popular

Long-term fixes tend to appeal to borrowers who want stability. They can be particularly attractive when you’re planning around a longer timeframe, such as:

• settling into a new home and wanting payment certainty
• budgeting for household costs over several years
• reducing exposure to rate rises during the fixed period

Pros of a long-term fixed-rate mortgage

1) Payment certainty for 7 or 10 years

The biggest benefit is straightforward: you know what your mortgage payments will be for the fixed term. That can make it easier to plan household spending and manage cash flow.

Because your rate is fixed, your payments won’t change due to movements in the wider interest rate environment while the deal is ongoing.

2) Protection if interest rates rise

If interest rates increase after you take out your mortgage, a long-term fixed rate can help you avoid paying a higher rate later.

3) Fewer remortgage decisions during the fixed period

With shorter fixed deals, you may need to make remortgage decisions more often. A longer fixed term can reduce how frequently you have to review your options during the fixed period.

4) Less impact from lender criteria changes during the fixed term

Mortgage lenders can change their underwriting and affordability criteria over time. If you’re on a longer fixed rate, you’re not required to refinance simply because criteria shift—at least until your fixed period ends.

Cons of a long-term fixed-rate mortgage

1) You may pay a higher rate at the start

Long-term fixed rates often come with a premium compared with shorter fixes. The trade-off is that you’re paying for the certainty of a fixed rate over a longer period.

In practice, that can mean your initial monthly payment is higher than it would be on a shorter fixed deal.

2) If rates fall, you may not benefit during the fixed period

A fixed rate is designed to protect you from rises, but it also means you usually can’t benefit from falling rates during the fixed period.

So if interest rates drop significantly after you take the deal, you may end up paying more than you would have on a newer, cheaper product.

3) Early repayment charges (ERCs) can apply

Many 7- and 10-year fixed mortgages include Early Repayment Charges (ERCs). These are fees that can apply if you repay the mortgage early—such as when:

• you sell your property
• you redeem a substantial portion of the balance
• you refinance during the fixed term

ERCs can be costly, so it’s important to consider how likely you are to move or make large repayments within the fixed period.

4) “Portability” may not remove all risk

Some long-term fixed mortgages are described as portable, meaning you may be able to take the interest rate with you if you move home.

However, portability is not always straightforward. It can depend on factors such as the new property and your circumstances, and the lender’s decision to proceed. If the lender won’t proceed, you may still face ERCs.

5) Lump sums and overpayments may trigger charges

Many borrowers plan to make overpayments or repay part of the mortgage using savings or an inheritance.

While some deals allow limited overpayments without penalty, paying more than any permitted amount within the fixed period may attract ERCs. Always check the specific terms of the mortgage.

6) Remortgaging to improve your rate may be harder

If your home increases in value, you may be able to improve your loan-to-value (LTV) and potentially access better pricing later.

But if you’re tied into a long fixed term, remortgaging before the end of the deal may be restricted by ERCs—meaning you could be less able to take advantage of improved LTV.

How to decide if a 7- or 10-year fix fits your plans

A long-term fixed rate can be a sensible choice when you value predictability and you’re comfortable with the commitment. It may be less suitable if you expect major changes, such as:

• moving house within the fixed period
• needing flexibility to refinance
• planning significant lump-sum repayments beyond any allowed limits

A useful way to approach the decision is to weigh:

• how strongly you prioritise payment stability
• how likely you are to redeem, refinance, or move
• whether the initial premium is affordable over the long term

Key takeaways

• Pros: long-term fixed rates offer payment certainty and protection if rates rise.
• Cons: you may pay a higher rate initially, and early repayment charges can make changes expensive.
• Decision point: consider your likely timeline—especially whether you might move or repay a large portion of the mortgage during the fixed term.