An estimated 2.4 million households missed or defaulted on at least one mortgage, rent, loan, credit card or bill in the month to 12 January.
This is a sharp rise from the estimated 1.8 million households who missed payments in the month to 8 December, according to the latest Which? Consumer Insight Tracker.
It said this volatility in missed payment rates around the Christmas period was also seen in previous years – possibly reflecting abnormal spending patterns over the festive period.
Renters more in danger of missing payments
The consumer champion noted that missed payments were particularly high among renters – with almost one in six (16%) admitting to missing at least one rent, loan, credit card or bill payment in the month to 12 January.
But a significant number of mortgage holders (6.8%) also missed essential payments in the period as the Bank of England base rate remains high.
Meanwhile, 2.8% of outright owners missed an essential payment.
When Which? drilled down into the data, it found of the 200 Universal Credit recipients in the sample, a quarter reported defaulting on a payment.
Bills were the most common type of payments for households to miss (5.1%), followed by loan or credit card payments (4.4%) and then housing payments (2.7%).
Of those who missed a household bill payment, the most common bill type missed was an energy bill (56%). Other commonly missed bill payments were council tax (36%), water (30%), phone (29%) and broadband and/or TV package (29%).
Adjustments to cover essential bills
Six in ten households (16.5 million in total) reported making at least one adjustment to cover essential spending such as utility bills, housing costs, groceries, school supplies and medicines in the last month.
Adjustments include cutting back on essentials, dipping into savings, selling possessions or borrowing money.