Fixed Rate Mortgages
A fixed rate mortgage locks your interest rate — and therefore your monthly repayment — for a set period, typically 2 or 5 years. After the fixed term ends, you revert to the lender's Standard Variable Rate (SVR) unless you remortgage or switch to a new product. Fixed rates provide certainty: regardless of what happens to the Bank of England base rate, your payment stays the same throughout the fixed term.
The trade-off is flexibility. If you want to overpay beyond the allowed amount (typically 10% of the outstanding balance per year without charge), switch lenders during the fixed term, or sell and move without porting the mortgage, you will likely pay an Early Repayment Charge (ERC). ERCs can be substantial — 2–5% of the outstanding loan in the first year, reducing over the fixed term.
The choice between a 2-year and 5-year fix comes down to your view on rates and your circumstances. A 2-year fix gives you flexibility to remortgage sooner but exposes you to rate changes every two years. A 5-year fix provides five years of certainty and lower arrangement/remortgaging costs spread over a longer period, but is a longer commitment with higher ERCs if your circumstances change — separation, redundancy, job move.
Tracker Mortgages
A tracker mortgage tracks the Bank of England base rate at a fixed margin — for example, 'base rate + 0.75%'. When the base rate changes, your monthly payment changes with it. Trackers are typically offered over 2–5 year terms, after which you revert to SVR, or as lifetime trackers that follow the base rate for the full mortgage term.
Tracker mortgages were particularly popular when base rates were very low (2009–2021), as they gave borrowers access to close-to-base-rate pricing. As rates rose sharply from 2022, tracker borrowers saw significant payment increases — a genuinely uncomfortable experience for those without financial buffers.
Many trackers come with no Early Repayment Charge, which is a meaningful advantage — you can switch to a fixed rate if rates look like they are rising, overpay freely, or port the mortgage without penalty. This flexibility has real value, particularly for buyers who are uncertain about their medium-term plans.
Standard Variable Rates
The Standard Variable Rate is the lender's default rate — what you revert to after a fixed or tracker deal ends if you don't remortgage. SVRs are set by each lender independently (they are not directly linked to the base rate, though they typically move in the same direction) and can be changed at any time with notice.
SVRs are almost always higher than the best fixed or tracker deals — typically 1–2% above equivalent fix products. There is rarely a good reason to stay on an SVR for more than a few months. The moment your fixed or tracker deal ends, you should already have a remortgage application in progress with a new lender or a product transfer arranged with your existing lender.
The one scenario where SVR has an advantage is maximum flexibility — there are no ERCs on an SVR, so you can overpay by any amount, switch lenders at any time, or redeem the mortgage entirely without penalty. This suits buyers who expect to sell or receive a large inheritance imminently.
Offset Mortgages
An offset mortgage links your mortgage to a savings account held with the same lender. The balance in your savings account is 'offset' against your mortgage balance, and you only pay interest on the difference. If you have a £250,000 mortgage and £30,000 in your linked savings account, you pay interest on £220,000 — saving interest equivalent to the earnings you would have received on that savings balance.
The key advantage is tax efficiency: because you are reducing mortgage interest rather than earning savings interest, there is no income tax on the benefit. For higher and additional-rate taxpayers, this can be significantly more valuable than a standard savings account. You retain access to the savings at any time — offsetting is not the same as overpaying.
Offset mortgages typically have higher interest rates than equivalent standard fixed or tracker products — so you need to be holding a meaningful amount in your savings account (usually at least 20–25% of the mortgage balance) for the offset to be worthwhile. They work best for self-employed borrowers who hold large retained earnings in a business account, or anyone with lumpy income who keeps significant liquid savings.
Repayment vs Interest-Only
All mortgage types can be structured as either repayment or interest-only. On a repayment mortgage, each monthly payment includes both interest and capital, so the balance reduces to zero at the end of the term. On an interest-only mortgage, you pay only the interest each month and the full loan balance remains outstanding at the end of the term — you must repay it in full, typically by selling the property.
Most residential mortgages are repayment. Interest-only is available for buy-to-let mortgages and some residential mortgages for high-net-worth borrowers, where lenders require evidence of a credible repayment vehicle (sale of property, investment portfolio, pension). Interest-only monthly payments are lower, but the financial risk is much higher — you need a clear plan for repaying the capital.
| Mortgage type | Rate certainty | Flexibility | Best for |
|---|---|---|---|
| 2-year fixed | High (2 years) | Low — ERCs apply | Buyers expecting circumstances to change soon |
| 5-year fixed | High (5 years) | Low — ERCs apply | Buyers wanting long-term payment certainty |
| Tracker | None — moves with base rate | Often high — no ERCs | Buyers needing flexibility; rate optimists |
| SVR | None — lender can change | Maximum | Short-term bridging before remortgage |
| Offset | Fixed or tracker with offset | Varies by product | Borrowers with large accessible savings |
Remortgaging and Product Transfers
When your fixed or tracker deal ends, you have two options: remortgage to a new lender or take a product transfer with your existing lender. Remortgaging involves a new full application, a new valuation (often free), and potentially better rates from across the market. A product transfer is simpler — you switch to a new deal with the same lender without a full affordability assessment, which is quicker and useful if your circumstances have changed (lower income, more debt) since the original application.
Start looking at your remortgage options 3–6 months before your current deal expires. Many lenders allow you to lock in a new rate up to 6 months ahead, protecting you against rate rises. If rates subsequently fall before your new deal starts, you can usually switch to a lower rate without penalty.
Key Takeaways
- ✓Fixed rates provide payment certainty but charge Early Repayment Charges if you exit early — consider your 2–5 year plans
- ✓Tracker mortgages move with the Bank of England base rate and often carry no ERCs, making them more flexible but less predictable
- ✓Standard Variable Rates are the most flexible but also the most expensive — never stay on SVR for longer than a few months
- ✓Offset mortgages suit borrowers with large liquid savings and are particularly tax-efficient for higher-rate taxpayers
- ✓Start remortgaging 4–6 months before your deal expires — you can lock in rates in advance and swap to better ones if rates fall