Personal Loans in the UK: APR vs Term Length and the Real Cost

APR represents the borrowing cost expressed annually. Term length is how long you take to repay. If you hold the loan amount and APR constant, a longer term usually reduces the monthly payment but increases the total interest paid, because interest has more time to accrue.

If you hold the loan amount and term constant, a lower APR usually reduces both the monthly payment and total interest. Real comparisons get messy because offers can differ on multiple dimensions at once: APR, term, fees, and flexibility around overpayments or early settlement.

The most practical way to compare is to look at: monthly payment, total repayable, and the term. Then decide which outcome you actually want: the lowest monthly commitment, the lowest total cost, or a balance.

1) Compare like-for-like borrowing

Start with the same amount borrowed. If one option rolls fees into the loan or encourages you to borrow more “for a buffer”, treat that as a different scenario, not the same comparison.

2) Look at total repayable, not just monthly payment

A lower monthly payment can be attractive, but if it comes from a longer term, it can raise total cost. If affordability is tight, a longer term may still be the right choice, but you should make it consciously.

3) Include fees and conditions

Personal loans often have fewer fees than cards, but fees can exist. Also check whether there are restrictions or costs around early settlement or overpayments. Even when there is no formal charge, some lenders have specific rules for how overpayments are applied.

4) If you plan to overpay, compare the “planned” term

Many people take a longer term for safety but intend to overpay to finish sooner. This can be sensible if it prevents missed payments in weaker months. If that is your plan, compare offers using the overpayment scenario, not the headline term. The Overpayment Impact Calculator is the right tool to model this.

Consolidating credit card debt into a personal loan can reduce interest if the offered APR is lower than your blended card cost and you do not extend repayment too far. The two most common failure modes are:

• Term creep: choosing a long term to reduce the monthly payment, increasing total interest.
• Reborrowing: clearing cards and then rebuilding balances, ending up with both a loan and new card debt.

A practical comparison is:

1. Model your baseline card repayment using the Credit Card Payoff Calculator at your realistic payment.
2. Model a consolidation scenario using the Debt Consolidation Savings Calculator.
3. Compare the outcomes at the same monthly payment where possible.

If the loan “wins” only when you stretch the term substantially, that is a warning sign. If the loan reduces cost and simplifies repayment without extending the horizon too much, it may be a sensible route.

Suppose you borrow £8,000. Offer A is 11.9% APR over 3 years. Offer B is 9.9% APR over 5 years. Offer B may look “better” because the APR is lower and the monthly payment is lower, but the longer term can increase total interest paid.

If you can afford the 3-year payment, Offer A can be cheaper overall even at a higher APR because you repay faster. If affordability is tight, Offer B may be appropriate, but you should understand the cost trade-off.

If you plan to overpay Offer B to finish in around 3 years anyway, model that overpayment plan rather than comparing the 5-year headline term. Use the Overpayment Impact Calculator to estimate how regular overpayments change payoff date and total interest.