Choosing how to pay for a car often matters more than choosing the car itself. The two most common routes in the UK are a personal loan from a bank or building society, and finance arranged at the dealership — usually hire purchase (HP) or personal contract purchase (PCP). Both can work well, but they behave very differently once you look past the monthly figure. Here is what to compare before you commit.

Start With the Total Cost, Not the Monthly Payment

Dealers are experts at making a deal feel affordable by spreading it over a long term. A £320 monthly payment sounds manageable until you realise it runs for five years on a car that will be worth a fraction of what you paid. Before comparing anything else, ask each provider for the total amount payable — the price of the car plus every penny of interest and fees. Then check what you will actually own at the end.

With a personal loan, you borrow a lump sum, buy the car outright and own it from day one. With HP, you own it once the final payment clears. With PCP, you own it only if you pay a large final balloon payment — otherwise you hand the keys back or part-exchange. Those three endings are the real difference between the deals.

Interest Rates and APR: Where the Gap Appears

Personal loan rates are usually advertised from around 5% to 7% APR for borrowers with strong credit, rising to 15% or more if your file is thinner or blemished. Dealer finance can beat that handsomely on new cars, where manufacturers sometimes subsidise rates to as low as 0%. On used cars, though, dealer HP commonly sits somewhere between 8% and 13% APR.

• Check the representative APR's small print. A lender only has to offer its advertised rate to 51% of successful applicants, so you may be quoted more.
• Compare like with like. A 0% deal on a car with no discount can cost more than a 6% loan on a car you negotiated hard on.
• Remember broker and administration fees are often rolled into the APR but sometimes charged separately.

A useful trick: get a personal loan quote first. It gives you a cash benchmark, and paying the dealer in full can strengthen your negotiating position.

Deposit Requirements: What You Need Up Front

A personal loan does not technically require a deposit, but the less you borrow, the less interest you pay. Many borrowers put down 10% to 20% to keep the repayments comfortable. Dealer finance typically asks for around 10% on HP, while PCP deals often expect 10% to 20% — though zero-deposit PCP offers exist, usually at a higher rate.

Part-exchange counts towards your deposit on dealer finance and can be convenient if your current car is hard to sell privately. Just check the trade-in value against what you could get selling it yourself; the difference is sometimes worth the hassle.

Mileage Limits: The Rule That Catches People Out

This is where PCP differs sharply from the alternatives. A PCP agreement sets an annual mileage cap, commonly 8,000 to 12,000 miles. Exceed it and you pay an excess mileage charge, typically 6p to 15p per mile but sometimes considerably more on premium or performance cars. Do 18,000 miles a year against a 10,000-mile cap and you could face a bill of several hundred pounds at handover.

HP and personal loans have no mileage restrictions at all. If you commute long distances, tow a caravan or simply drive a lot, that freedom is worth real money. Mileage also affects the car's value, so heavy use hits residuals either way — but only PCP turns it into a contractual penalty.

Balloon Payments and What Happens at the End

A PCP balloon payment — the optional final payment — is set at the start and based on the car's predicted value. At the end you have three choices: pay it and keep the car, part-exchange towards a new one, or hand the car back. The guaranteed future value protects you if used prices fall, because the lender carries that risk, provided you have stayed within mileage and kept the car in reasonable condition.

HP and personal loans have no balloon. You make the final payment, and the car is yours with nothing left to settle. That certainty suits people who keep cars for eight or ten years. One more thing worth knowing: under the Consumer Credit Act, many car finance agreements let you voluntarily terminate once you have paid half the total amount payable — useful if circumstances change, but it can affect your credit file, so read the terms carefully.

Matching the Route to Your Circumstances

There is no universal winner, only a best fit for how you drive and what you want at the end.

• High annual mileage, long ownership, no desire for a new car every few years: a personal loan or HP usually wins.
• Low mileage, a new car every three years, and you want the lowest monthly payment: PCP can be excellent value, especially with a subsidised rate.
• You want to sell or change cars at any point without penalty: a personal loan gives you the most flexibility.
• You have savings you would rather keep: borrowing may still make sense if the rate is lower than what your savings earn — but only if the repayments are comfortably affordable.

Whichever route you take, get quotes from several lenders within a short window so the credit searches have less impact, check the early settlement terms, and be honest about your mileage. A deal that fits your real driving life will always beat one that merely looks cheap on the forecourt.