When taking out a secured loan, one of the most consequential choices is whether to take a fixed or variable interest rate. A fixed rate locks the monthly repayment for a set period, or in some cases for the full loan term, regardless of what happens to interest rates in the wider market. A variable rate can change, typically in line with the Bank of England base rate or the lender’s standard variable rate (SVR), meaning repayments can fall if rates drop or rise if they increase.
Neither is inherently better. The right choice depends on budget flexibility, the loan term, whether early repayment is likely, and tolerance for payment uncertainty. This guide explains how each rate type works, what the cost difference can look like in practice, and the circumstances that tend to point toward one or the other. It also introduces the APRC (annual percentage rate of charge), which is the standard way to compare the total cost of secured loans in the UK. It is informational only and does not constitute financial advice. The fixed vs variable rate comparator tool allows the two options to be modelled side by side with specific figures.
At a Glance
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A fixed rate sets the same monthly repayment for a defined period, typically two to five years on a secured loan. The repayment is known from day one, but the starting rate is typically higher and early repayment charges are common during the fixed period.
The lender absorbs the interest rate risk for the duration of the fixed period, and the borrower pays a premium for that certainty. If market rates rise, the fixed-rate borrower is protected. If rates fall, they continue paying the higher agreed rate. Most secured loan products revert to the lender’s SVR once the fixed period ends, which can be significantly higher. When comparing products, the APRC (annual percentage rate of charge) captures the total cost including any reversion, making it a more useful comparison measure than the headline fixed rate alone. Fixed products commonly carry early repayment charges that can be significant if the loan is settled before the fixed period ends, which reduces flexibility if circumstances change.
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A variable rate starts lower and can save money if rates stay flat or fall, but payments can rise if rates increase and the total cost is unknown until the loan is repaid.
The borrower carries the interest rate risk in exchange for a lower starting rate. Variable products are more likely to allow overpayments and early settlement without significant penalty, which adds flexibility. The risk is that even a 1 to 2 percentage point rise can add a meaningful amount to monthly outgoings on a large loan, and over a long term the range of possible rate movements is wide enough to make the total cost genuinely uncertain.
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Three factors tend to settle the decision: how tight the monthly budget is, how long the loan will run, and whether early repayment is a realistic possibility.
A tight budget that cannot absorb a payment increase points toward fixed. A shorter term where rate exposure is limited, or a plan to repay early where the absence of an ERC matters, points toward variable. On longer terms the case for fixing strengthens because the range of possible rate movements is wider. The most useful preparation is to model the actual numbers: what does the monthly difference between the two quotes amount to, and what would the variable payment become if rates rose by 1.5 to 2 percentage points? The comparison table, illustrative scenario, and calculator in this guide all support that exercise.
› Factors that point toward fixed or variable · Side by side comparison
What a fixed rate means in practice
A fixed-rate secured loan charges the same interest rate for a defined period. In the UK second charge market, the most common fixed periods are two, three, or five years. During that period the monthly repayment does not change regardless of what happens to the Bank of England base rate or broader market conditions, and this predictability is the defining feature of the fixed rate: the borrower knows exactly what they will pay each month and can plan accordingly. Some lenders do offer whole-of-term fixed rates where the rate is locked in for the entire loan, though these are less common and typically priced at a premium.
The trade-off is that lenders typically price fixed rates above the equivalent variable rate at the time of application, because the lender is absorbing the risk that rates will rise during the fixed period. If rates do rise significantly after the loan is taken out, the fixed-rate borrower benefits from not being affected. If rates fall, the fixed-rate borrower continues paying the higher agreed rate and does not benefit from the drop.
An important consideration is what happens when the fixed period ends. On most secured loan products, the rate reverts to the lender’s standard variable rate (SVR), which is typically significantly higher than the initial fixed rate. For example, a product with a 5.89% fixed rate for five years might revert to an SVR of 8% or above for the remainder of the term. This reversion is reflected in the product’s APRC (annual percentage rate of charge), which is the standard cost measure for secured loans in the UK. The APRC captures the total cost of borrowing over the full term, including the initial rate, any reversion to SVR, and compulsory fees. It is the most reliable way to compare the true cost of different secured loan products. The guide to APR and APRC on secured loans explains how these cost measures work in more detail.
Fixed-rate secured loans commonly carry early repayment charges (ERCs) during the fixed period, which can be significant if the loan is settled before the fixed period ends. ERCs on fixed products are typically calculated as a percentage of the outstanding balance, often on a sliding scale that reduces each year. The early repayment charge calculator models what an ERC might look like at different stages of a loan.
What a variable rate means in practice
A variable-rate secured loan is linked to a benchmark rate, usually the Bank of England base rate or the lender’s SVR. When the benchmark rises, the loan rate and monthly repayment typically rise with it. When the benchmark falls, the rate and repayment may fall too, though lenders do not always pass on reductions in full or immediately. Some variable products also include a rate floor: a stated minimum below which the loan rate cannot fall even if the benchmark drops further. The product terms should confirm whether a floor applies. The starting rate on a variable product is generally lower than the equivalent fixed rate, which means lower initial repayments, but that advantage can be eroded or reversed if rates move upward during the loan.
Variable-rate secured loans are more likely to allow overpayments or early settlement without a significant charge, or with a lower charge than the equivalent fixed product, though this varies by lender and product. The overpayment impact calculator shows how regular overpayments can reduce the total interest on a variable loan. This flexibility can be valuable if the borrower expects to make overpayments when income allows, or if the loan may be redeemed early, for example because the property is being sold or remortgaged. For borrowers on a tight budget, the uncertainty of variable payments is the key risk: a rate rise of even 1 to 2 percentage points can add a meaningful amount to monthly outgoings depending on the loan size and term. Understanding the impact of rate changes on repayments before committing is worthwhile, and the fixed vs variable rate comparator is designed for exactly this. The variable rate payment impact calculator offers a quicker way to model how a specific rate change affects the monthly figure.
Side by side: the key differences
The table below summarises the main points of difference between fixed and variable secured loan rates. All references to typical patterns are based on how these products commonly work in the UK market; actual terms vary by lender and product. For definitions of terms used here, the secured loan glossary may be helpful.
| Factor | Fixed rate | Variable rate |
|---|---|---|
| Monthly repayments | Remain the same for the fixed period (typically 2 to 5 years). After the fixed period, most products revert to the lender’s SVR, which is usually higher. | Can rise or fall in line with the benchmark rate. Payments may change at any point during the loan. |
| Starting rate | Typically set above the equivalent variable rate to reflect the lender’s risk of market rate increases during the fixed period. | Usually lower than the equivalent fixed rate at outset, though this can change. |
| Rate risk | Protected against rate rises for the duration of the fixed period. No benefit if rates fall. Exposed to SVR level on reversion. | Repayments may fall if rates drop. Exposed to increases if rates rise. |
| Early repayment | Early repayment charges are common during the fixed period, often a percentage of the outstanding balance on a sliding scale. Can be significant in the early years. | ERCs are less common or lower on variable products, though they still apply on some deals. Confirm before applying. |
| Cost comparison | Compare using APRC, which includes the initial fixed rate, the SVR reversion rate, and compulsory fees over the full term. | Compare using APRC, which reflects the variable rate and compulsory fees over the full term. |
| Best suited to | Longer loan terms, tight budgets, borrowers who want payment certainty during the fixed period and are unlikely to repay early. | Shorter terms, borrowers with budget flexibility, those who may overpay or need to redeem early. |
How the numbers compare
The interest rate on a fixed or variable loan has a direct and material effect on the monthly repayment and the total interest paid over the life of the loan. Even a difference of 1 to 2 percentage points compounds significantly over longer terms. The chart below lets you compare a fixed rate and a variable rate side by side: set each rate using the sliders, choose the loan amount, and see how the monthly repayment and total interest differ across five term lengths. All figures are illustrative and assume each rate is held constant for the full term.
Interactive tool
Fixed vs variable rate cost comparison
Set a fixed rate and a variable rate to see the monthly repayment and total interest difference across five loan terms. Adjust the variable rate slider to test what happens if rates rise.
Your data stays private. Nothing you enter is stored, transmitted, or accessible to anyone. All calculations run entirely in your browser.
Monthly repayment (£)
Total interest paid (£)
For a detailed side-by-side comparison of a specific fixed rate quote against a variable scenario at different rate levels, the fixed vs variable rate comparator works through the full cost difference including ERCs. For guidance on all the fees that sit alongside the interest rate, the guide to secured loan fees explained covers arrangement charges, valuation costs, and legal fees.
Factors that tend to point toward fixed or variable
The right rate type is not the same for every borrower or every loan. The following factors are worth considering when weighing the choice.
Budget stability is the most significant. A borrower with a tight monthly budget, where a payment increase of even £50 to £100 per month would create strain, is generally better placed with a fixed rate. The certainty of knowing exactly what the repayment will be each month, for the duration of the fixed period, removes one variable from an already stretched financial position. A borrower with more flexibility in their income and outgoings may be more comfortable absorbing some payment movement in exchange for the lower starting rate on a variable product. The guide to fixed monthly payments vs flexible terms covers this trade-off from the repayment structure side.
The loan term also matters. On a two or three year loan, the period of exposure to rate movement is relatively contained. A variable rate may move modestly over that period, and the lower starting rate may still result in a lower total cost than the fixed equivalent. On a loan of seven or ten years, the range of possible rate movement is much wider, and locking in a known cost through a fixed rate becomes more attractive for many borrowers. The guide to APR and APRC on secured loans explains how the rate compounds across different term lengths.
The likelihood of early repayment is a third factor. If the property might be sold or remortgaged during the loan term, or if overpayments are planned to clear the debt early, a variable rate product may allow this with lower penalties than a fixed deal. On a fixed loan, an ERC calculated as a percentage of the outstanding balance can significantly increase the effective cost of early redemption. Understanding the ERC terms before committing to a fixed product is important, particularly for borrowers who anticipate their circumstances changing.
Finally, the current interest rate environment is relevant, though no one can reliably predict rate movements. In a period of high or rising rates, some borrowers prefer the certainty of fixing before any further increases. In a period of falling rates, a variable product may reduce repayments without any action from the borrower. Both observations are based on the current situation rather than any prediction of what will happen next.
An illustrative comparison
To make the numbers concrete, consider an illustrative example. A borrower takes a £40,000 secured loan for home improvements over ten years. Two offers are on the table: a fixed rate of 6.5% and a variable product currently at 5.5%, linked to the lender’s SVR.
At the fixed rate, the monthly repayment is approximately £454, and total interest over ten years is approximately £14,500. The payment will not change for the duration of the fixed period, and there is an ERC of around 2% of the outstanding balance if the loan is repaid early during that period. At the starting variable rate of 5.5%, the monthly repayment is approximately £434, a saving of around £20 per month. However, if the SVR rises by 1.5 percentage points during the loan, the variable repayment would increase to approximately £464 per month, which over the remaining term would add meaningfully to the total cost. For the variable deal to cost the same as the fixed deal over the full ten years, the variable rate would need to average 6.5% across the term. Starting at 5.5%, that means there is a buffer of 1.0 percentage point before the average variable rate catches up with the fixed rate. These figures are illustrative only and assume each rate applies for the full term; actual rates, ERCs, reversion terms, and repayment amounts will vary by lender and individual circumstances.
Show the working
Fixed rate scenario: 6.5%
Variable rate scenario: 5.5% at outset
If SVR rises by 1.5 percentage points to 7.0%
Break-even point
All figures assume £40,000 over 10 years at the stated rate from day one, using a standard amortised repayment calculation. Total repayable figures are rounded to the nearest pound. In practice, a variable rate changes during the term, so the total cost depends on when and by how much it moves. The £464.43 figure assumes the full loan is recalculated at 7.0% for the entire term; a mid-term rise would produce a blended figure between £434.11 and £464.43. The break-even point means the variable rate would need to average 6.5% across the full ten years for the total cost to equal the fixed deal; starting at 5.5%, the variable rate has a 1.0 percentage point margin before reaching that average. Figures are illustrative only and do not account for reversion to SVR on fixed products. Actual product costs should be compared using APRC.
Not sure what to look at next?
All of our secured loan guides and tools in one placeFrequently asked questions
Can I switch from a variable rate to a fixed rate during the loan?
This depends on the lender and the terms of the original loan agreement. Some secured loan products allow a rate switch, but it typically involves an application process, a product transfer fee, and a new assessment of the rate available at the time of switching. It is not always possible, and it is not a guaranteed option even where it is mentioned in the original product information.
If the option to switch rates during the loan is important, this is worth confirming explicitly with the lender before taking the product, rather than assuming it will be available later. A broker with access to the market can also identify products that offer this flexibility as a specific feature, which is distinct from products where a switch may technically be possible but involves a full refinance.
What happens when my fixed rate period ends?
On most UK secured loans, when the fixed rate period expires the loan reverts to the lender’s standard variable rate (SVR). The SVR is set by the lender and is typically significantly higher than the initial fixed rate, so monthly repayments can increase substantially at the point of reversion. For example, a loan fixed at 5.89% that reverts to an SVR of 9.55% would see a noticeable jump in the monthly payment.
Borrowers approaching the end of a fixed period have several options. A product transfer with the same lender may allow a move onto a new fixed or variable deal without a full application. Alternatively, remortgaging to a different lender or taking a new secured loan product can be explored. The key is to start reviewing options well before the fixed period ends, ideally three to six months ahead, to avoid drifting onto the SVR by default. A whole-of-market broker can compare the options and identify whether staying, switching, or refinancing produces the lowest overall cost.
How do early repayment charges typically differ between fixed and variable products?
Fixed-rate secured loans commonly carry an ERC during the fixed period, often calculated as a percentage of the outstanding balance at the time of repayment. This can range from around 1% to 5% depending on the lender and how early in the term the redemption occurs, with higher charges in the early years. The ERC is designed to compensate the lender for the interest they expected to receive over the remaining fixed period.
Variable rate products are more varied. Some carry no ERC at all, particularly tracker products linked directly to the base rate. Others carry a smaller or time-limited ERC. The absence of a significant ERC is one of the practical advantages of variable products for borrowers who may need to repay early, though this should always be confirmed in the product documentation rather than assumed. The early repayment charge calculator models the likely cost of early settlement on a fixed product.
Does adverse credit affect which rate type is available?
Adverse credit typically reduces the range of products available and results in higher rates on both fixed and variable products. Specialist lenders who serve borrowers with adverse credit tend to offer both rate types, though their fixed rates will reflect the higher risk profile in their pricing. In practice, the choice between fixed and variable remains available in the adverse credit market, but the starting rates on both options will be higher than those available to borrowers with a clean credit history.
The more relevant question for a borrower with adverse credit is whether the loan is affordable at the rate likely to be offered, and whether a fixed rate provides the budget certainty needed to manage repayments reliably over the term. For a fuller explanation of how adverse credit affects secured loan options and rates, the guide to secured loans for bad credit covers this in detail.
Are there hybrid rate products between fixed and variable?
Yes, though they are less common in the second charge market than in residential mortgages. Capped rate products set a variable rate with a ceiling it cannot exceed, providing some protection against significant rises while retaining the benefit of falls. Tracker products are linked directly to the Bank of England base rate rather than a lender’s SVR, giving more transparency about how and when the rate will change. Discounted variable products offer a defined discount off the SVR for a set period.
These hybrid or alternative rate structures can be useful in specific circumstances, but they introduce additional complexity in terms and conditions. Reading the product documentation carefully is important, and a broker experienced in the secured loan market can help identify whether a niche product of this type is actually more cost-effective than a straightforward fixed or variable deal for a given borrower’s circumstances.
Which rate type tends to suit a debt consolidation loan?
For a debt consolidation secured loan, the primary objective is usually to replace multiple unpredictable payments with a single manageable one. In that context, a fixed rate has an obvious appeal: the consolidated payment is known and stable, which is the point of the consolidation. A variable rate reintroduces payment uncertainty, which may conflict with the goal of bringing financial stability to the monthly budget.
That said, a variable rate at a materially lower starting rate may be worth considering if the borrower has budget headroom to absorb a moderate increase and the loan term is relatively short. The guide to secured loans for debt consolidation covers the broader considerations of using a secured loan for this purpose, including the risks of securing unsecured debt against a property. The debt consolidation saving and true cost calculator compares the cost of consolidation against keeping existing debts.
Squaring Up
Fixed and variable rates suit different borrowers and different circumstances. A fixed rate provides certainty during the fixed period and protection against rate rises, at the cost of a higher starting rate, a reversion to SVR when the fixed period ends, and usually a meaningful early repayment charge. A variable rate offers a lower initial cost and often more flexibility on early repayment, at the cost of payment uncertainty if market rates move upward.
The most useful thing to do before deciding is to model the actual figures: what does the monthly difference between the fixed and variable quotes amount to, and what would the variable payment become if rates rose by a meaningful amount? When comparing products, use the APRC rather than the headline rate to understand the total cost including any reversion and fees. The comparator and calculator tools linked throughout this guide are designed for exactly that exercise. A broker with access to the whole of the market can also identify products that fit the specific circumstances rather than limiting the choice to direct lender deals.
Continue your research
Guides, calculators, and comparators covering every aspect of secured lending Explore guides and toolsUpdate log: August 2026
What changed in this update
The guide now distinguishes between initial fixed rate periods (typically two to five years on UK secured loans) and whole-of-term fixed rates, and explains what happens when a fixed period ends and the loan reverts to the lender’s SVR. APRC (annual percentage rate of charge) has been introduced as the standard cost comparison measure for secured loans, alongside the existing discussion of interest rates. A new FAQ covers what borrowers should do as a fixed period approaches its end.
The interactive chart tool now supports dual-rate comparison, allowing a fixed rate and a variable rate to be set side by side to see the monthly and total interest difference across five term lengths. The illustrative scenario includes a break-even calculation showing the average variable rate at which the two options produce the same total cost. A note on variable rate floors has been added to the variable rates section. Additional cross-links have been added to the overpayment impact calculator, the variable rate payment impact calculator, the fixed monthly payments vs flexible terms guide, and the secured loan glossary.
This article is for informational purposes only and does not constitute financial advice. Your home may be repossessed if you do not keep up repayments on a mortgage or other debt secured on it. Rate, APRC, and fee information is illustrative; actual terms depend on the lender and your individual circumstances. Actual outcomes will depend on your individual circumstances.
