Aldi has issued a warning to shoppers who are overpaying by up to £126 a month by using loyalty cards at the UK's major supermarkets. This equates to £31 a week, according to new analysis.
Findings from Which? Data
The findings, based on Aldi's calculation using independent data from Which?, found that loyalty card shoppers at every major UK supermarket are still paying more than they would at Aldi even with their loyalty cards applied. Based on the latest Which? Monthly supermarket comparison (April 2026), the weekly 'loyalty tax' per household vs Aldi prices is:
- Sainsbury's Nectar: £31.63 a week (£126 a month)
- Tesco Clubcard: £26.34 a week (£105 a month)
- Lidl Plus: £2.43 a week (£10 a month)
Lidl Plus delivered the smallest saving of any major scheme – just 9p on a typical weekly shop compared to Lidl's standard prices, according to Which?. Even with Lidl Plus applied, Aldi was still cheaper for an average weekly shop in April 2026.
Consumer Confidence and Collective Overpayment
The findings come at a moment of heightened public scrutiny of supermarket loyalty schemes. They also coincide with record-low consumer confidence, with the BRC-Opinium Consumer Sentiment Monitor showing 41% of shoppers expect their grocery bills to rise over the next three months. Across the three loyalty schemes tracked by Which? alongside Aldi – Tesco Clubcard, Sainsbury's Nectar and Lidl Plus – UK households are collectively overpaying by more than £15 billion a year. Tesco Clubcard shoppers alone account for over £10 billion of that figure, with Sainsbury's Nectar shoppers a further £6.7 billion.
Aldi Named Best Value Brand
The analysis follows Aldi being named 'Best Value Brand of the Year' by Which? last week. Julie Ashfield, Chief Commercial Officer at Aldi UK, said: “We're proud that independent research has consistently shown Aldi to be the UK's cheapest supermarket. Even after loyalty cards are applied, shoppers are still paying more than they would at Aldi. We invest in everyday low prices instead of loyalty schemes. At a time when households are looking to make every pound count, our analysis highlights how much that difference can add up to, whether you shop with a Clubcard, a Nectar card or a Lidl Plus account – points don't make your weekly shop cheaper, Aldi does.”
