Halifax clarified how 0% purchase periods end on its Clarity credit card after consumer group Which? reported a jump in complaints from cardholders who believed interest-free windows followed statement dates rather than the day each purchase posted. The lender updated app and paper statements to show a per-transaction countdown and refreshed website worked examples, a move that arrives as the Financial Conduct Authority keeps promotional-rate transparency inside its Consumer Duty priorities.
Where cardholders tripped up
Clarity's headline offer promises no interest on purchases for a fixed number of months from account opening, but partial repayments allocate to the most expensive balances first under UK allocation rules. Customers who carried a transferred balance or cash advance sometimes saw new purchases accrue interest earlier than expected because payments did not clear the promotional bucket in the order they assumed.
Which? caseworkers said many callers quoted marketing lines about "up to 24 months" without reading footnotes on when the clock starts. Others confused the purchase promo with a separate money-transfer deal, leading to surprise standard rates on retail spending after a single mis-timed ATM withdrawal.
Halifax's response
Halifax did not change the underlying APR table but added plainer language: each purchase now lists an estimated last interest-free date in the mobile app, and paper statements bold the sentence that the promotional period begins on the transaction date, not the statement cut-off. Customer-service scripts now walk callers through allocation order before offering hardship plans.
The bank said the refresh was planned before Which? published its bulletin but accelerated after complaint volumes rose in September. It declined to disclose exact case numbers.
FCA context
The FCA has warned repeatedly that "0%" labels fail when footnotes outrank headlines. Consumer Duty assessments expect firms to test whether vulnerable customers understand when revert rates apply. Credit card issuers across the market face similar scrutiny on balance-transfer traps; Halifax's Clarity brand is particularly visible because it targets fee-conscious spenders who compare tables on comparison sites.
Industry lawyers said the change is unlikely to trigger enforcement if Halifax can show improved outcomes in mystery-shopping tests, but persistent misallocation complaints could still draw supervisory questions.
Practical guidance
Cardholders should set calendar reminders a month before each promo ends, avoid cash withdrawals on promotional cards, and pay more than the minimum if any higher-rate balance exists. Comparison sites may still rank Clarity highly for travellers because of its fee structure, but the lesson this week is that promotional maths is transaction-specific.
For households juggling Christmas spending, the fix reduces ambiguity but does not remove the need to read allocation rules—especially when multiple Halifax products share a single online login.