It is not a trap if you pay it off inside the promotional window and it is not if you would have bought the thing anyway. It is a trap in one specific case: a deferred-interest deal where a single late payment can retro-charge interest on the entire balance from day one — on a £2,000 sofa at 24.9% APR over 24 months, that is roughly £540 you thought you had avoided.
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The difference nobody explains at the till
| Type | What 0% means | If you slip |
|---|---|---|
| Interest-free credit (waived) | Interest is genuinely never charged | You pay the normal APR from that point forward |
| Deferred interest (BNPL-style) | Interest accrues silently from day one | All accrued interest is added: often 20–29.9% of the original balance |
| Store card promo | 0% on that purchase only | Standard card APR, and the promo rate can be withdrawn on a missed payment |
| Buy now pay later, 3–4 instalments | Usually genuinely 0% | Late fees per instalment, typically £6–£12 |
Both can be advertised identically as "0% finance". The word to look for in the small print is deferred. If it is there, the interest exists — you are just being lent the cost of it for 12 or 24 months.
The three questions to ask before signing
- Is the interest waived or deferred? Waived: a late payment costs you going forward. Deferred: a late payment costs you retroactively on the whole balance. This single answer changes the risk profile completely.
- What is the go-to APR after the promo? If you do not clear the balance in time, this is what you will pay on the remainder. Anything over 20% is worse than a normal credit card, and several store cards sit at 29.9%.
- What triggers the penalty? One missed direct debit, or only a default after 30 days? Ask whether paying the minimum counts as "on time", and whether early settlement is allowed without losing the 0%.
Run the actual numbers
£2,000 sofa, 24 months at 0% = £83.33 a month. Set against a savings account paying 4%, keeping the £2,000 invested and paying monthly earns you about £85 over two years. That is the whole financial upside of 0% finance: a rounding error on the sofa, not a reason to buy it.
The downside is bigger than the upside. Miss month 23 and the deferred-interest version adds roughly £540 — six and a half times the benefit you earned by keeping the cash. Asymmetric bets are worth taking when the downside is small; this one is not.
When 0% is the right call
- The cash is already sitting in your account. You are choosing to spread payments for cash-flow reasons, not because you lack the money. Set the direct debit for a date two days after payday.
- You would buy this item at this price anyway. 0% finance does not make a £2,400 sofa worth £2,400. It makes an already-decided purchase cheaper to cash-flow.
- You can overpay. Paying £120 instead of £83 clears a 24-month deal in 17 months and removes the risk window entirely. Ask if early settlement is penalty-free — usually it is.
- You have a buffer. A £1,000 emergency fund is worth more than 0% finance on a sofa, because the scenario that breaks the deal is exactly the scenario the fund exists for.
And the honest alternative: buying a £1,200 sofa outright instead of a £2,000 one on 24 months of credit. On a cost-per-year basis the cheaper sofa financed at 0% is rarely cheaper than the good sofa bought with cash — you have simply moved the cost into a monthly number that is easier to say yes to.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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