The Real Cost of a Payday Loan: When 'Simple' Interest Hits 400% APR

A Small Loan That Looks Manageable

You need £200 to cover an unexpected bill before payday. A payday lender offers to lend it to you for 14 days at a fee of £15. That sounds reasonable — it's less than a restaurant meal. You accept, repay £215 on payday, and move on.

But what you've just paid is an annual percentage rate (APR) of approximately 391%. Not because the lender is hiding anything — the number is just what happens when you annualise a short-term rate. Understanding this number, and what it means in practice, is essential before using any short-term high-cost credit.

How the APR Calculation Works

Converting a payday loan fee to APR uses the same simple interest logic applied to a full year:

• Fee: £15 on £200 over 14 days
• Daily interest rate: £15 ÷ £200 ÷ 14 = 0.536% per day
• APR (simple): 0.536% × 365 = 195.5%
• APR (compound, daily): (1 + 0.00536)³⁶⁵ − 1 = approximately 391%

The FCA in the UK requires payday lenders to display APR, and the figures involved — typically between 300% and 1,500% depending on loan term — are genuinely alarming at first glance. This is why APR is sometimes described as "misleading" for very short-term loans: the annualisation creates a large number that would never actually be incurred unless the loan were rolled over continuously for a full year.

Why APR Is Both Misleading and Necessary

The criticism of using APR for payday loans has some merit. If you borrow £200 for two weeks and repay £215, you've paid £15 in interest — not 391% of anything. Applying an annual rate to a 14-day product inevitably produces large numbers.

But APR exists precisely for comparison. Without it, a borrower cannot meaningfully compare a payday loan against a credit card (20% APR), an overdraft (40% APR), or a personal loan (8% APR). The large APR figure is not designed to describe what you'll pay if you borrow once — it's designed to show you how much you'd pay relative to other forms of credit if you were borrowing continuously.

And for many payday loan users, continuous borrowing is exactly what happens.

The Debt Trap: Rolling Over Loans

The payday lending business model has historically relied on rollovers — borrowers who cannot repay at the end of the loan term and instead take a new loan to cover the old one. Each rollover incurs a new fee. Research from the Competition and Markets Authority found that a significant proportion of payday loan revenue came from repeat borrowers rather than one-time users.

Consider what happens when the £200 loan rolls over monthly for six months:

• Month 1: £200 borrowed, £15 fee
• Month 2: rolled over, another £15 fee
• Month 3: another £15 fee
• …after 6 months: £90 in fees paid, original £200 debt unchanged

Academic research by Skiba and Tobacman (2019) found that payday loan use is associated with significantly elevated rates of bankruptcy, particularly among borrowers who roll over multiple times. The loan doesn't cause the bankruptcy in isolation — but it amplifies existing financial stress in a way that other forms of credit do not.

UK Regulation: The FCA's Price Cap

In January 2015, the Financial Conduct Authority introduced a price cap on high-cost short-term credit (HCSTC) — colloquially known as payday loans. The cap has three components:

• Initial cost cap: Interest and fees cannot exceed 0.8% per day of the amount borrowed
• Default cap: Default charges (for late payment) cannot exceed £15
• Total cost cap: The total amount repayable can never exceed double the original loan — if you borrow £200, you can never owe more than £400 in total, including all interest and fees

This double cap effectively eliminated the worst rollover scenarios and drove several high-profile payday lenders — including Wonga — out of business. The FCA estimated the cap saved consumers around £150 million per year. However, it also reduced the supply of short-term credit, which has pushed some borrowers toward unregulated loan sharks where protections don't exist.

Alternatives Worth Knowing

Credit unions

UK credit unions are member-owned financial cooperatives that offer short-term loans at substantially lower rates. The maximum APR a UK credit union can charge is 42.6%, and many offer emergency loans at considerably lower rates to existing members. Credit unions are particularly strong in communities with lower average incomes — precisely the populations most targeted by payday lenders.

0% credit cards

For borrowers with sufficient credit history to qualify, a 0% purchase credit card offers the same short-term liquidity as a payday loan at no interest cost during the promotional period (typically 12–24 months). The challenge is that payday loan users often don't have the credit score needed to access 0% products.

Employer advance schemes

Several large employers now offer salary advance schemes — effectively letting employees access already-earned wages before payday. Some, like Wagestream, charge a small flat fee per transaction rather than interest. These schemes remove the need for external borrowing entirely for short-term shortfalls.

Local welfare assistance

Local councils in England administer Local Welfare Assistance (LWA) schemes for residents in genuine short-term financial crisis. Unlike loans, these are grants or no-interest emergency payments for essential needs. Availability and eligibility vary by council.

Who Uses Payday Loans — and Why

Payday loan users are disproportionately younger, lower-income, and in irregular employment. This is not a coincidence — these are the populations with least access to mainstream credit. The tragedy of high-cost short-term credit is that it charges the highest rates to the people with the least financial resilience to absorb them. Improving financial literacy helps at the individual level, but systemic access to affordable credit is the structural solution.

If you're evaluating a short-term loan, use a simple interest calculator to work out the total cost and the effective APR before committing. The numbers are rarely as comfortable as the marketing suggests.