You pay your insurance in twelve instalments and it costs you 17.4%

Every month a 43-euro direct debit shows up on your statement. The twelve charges add up to 516 euros for a policy that cost 480 paid in one go and, once you place each charge on its date, the financing works out at 17.4% APR.

Nobody calls a direct debit a loan, and that is exactly what it is.

The subtraction gives you the first figure: spreading it out costs 36 euros. Dividing them by 480 produces 7.5%, but that percentage treats the full price as if it had stayed in your pocket all year. The first 43-euro receipt is paid at the start, so the amount actually deferred is 437. You then hand over 473 euros through eleven monthly charges. Your average balance over that period is exactly 222 euros. Applied to that calendar, the cost comes to roughly 1.34% a month and 17.4% APR.

There is a third price worth looking at before you accept the monthly one. On the half-yearly plan, two receipts of 245 euros add up to 490. That is ten euros more than the annual payment. Since you pay the first one at the start, the company leaves 235 euros outstanding for six months and then charges the other 245. Those ten euros represent about 4.3% over half a year and around 8.7% once annualised.

The half-yearly plan solves the problem of a concentrated payment at close to half the cost of the monthly one. All three amounts fit into a single comparison: 480 euros today, 245 today and 245 in six months, or twelve charges of 43. The small instalment only appears once a month; the financial commitment covers the whole year.

The initial 7.5% is still a useful figure for identifying the total surcharge, though it describes its financial intensity poorly. APR takes in when each euro leaves your account. The calculation recognises that the outstanding amount starts at 437 euros, falls with each charge and stays, on average, at 222. That is where the jump to 17.4% comes from, without adding any cost missing from the subtraction.

The surcharge has to appear in writing in the specific terms of the policy. A monthly price given over the phone leaves out the full picture: you need the annual total for exactly the same cover and the schedule of due dates. If they only give you the instalment, ask for the table of receipts with their dates: it is the same information written another way, and no policyholder can be denied it. If the document shows 43 euros a month and 516 in total, the 36 euros correspond to the instalment plan. That line lets you compare the cost against the half-yearly plan and spot any figure different from the one advertised. The surcharge is usually worked out as a percentage of the premium, so it grows with it: the same 7.5% applied to a 900-euro policy is not 36 euros, it is about 68.

Paying in instalments keeps an annual obligation in place. The twelve direct debits do not work as twelve independent insurance policies you can walk away from whenever you like. If one goes unpaid, cover is suspended one month after that receipt falls due. In the meantime, the company can claim the outstanding part of the premium. A month with little in the account can leave you without protection and in debt for the rest of the year.

Paying 36 euros may still be reasonable. A single 480-euro charge could cause an overdraft, land alongside the rent or push you towards more expensive financing. In that case, the monthly calendar buys you room in your cash flow. The figure tells you what that room costs, and lets you check whether the two payments of 245 offer a good enough solution for ten euros.

The comparison also changes with the money you have available. Anyone who can absorb 480 euros without squeezing other payments gets the lowest price. Anyone who needs to spread it over a year pays 516. In between sits a 490-euro option that demands more cash up front but avoids eleven charges and cuts the financing cost a great deal. Choosing with all three calendars in front of you turns a monthly feeling into an annual decision. It is worth redoing the sums at every renewal: the surcharge can change from one year to the next without anyone flagging it, because what renews is the policy, not the comparison.

Tomorrow, ask by email for the annual price, the monthly price and the exact dates of each charge for the same cover. Enter into an APR calculator 437 euros received on the date of the first charge and eleven outgoings of 43 euros on their eleven monthly due dates: you will get close to 1.34% a month and 17.4% APR. Repeat the calculation with the two half-yearly receipts before you choose.