As the economic situation worsens people's attitudes to saving having been affected with consumers coming to terms with rising food and fuel prices.
The frequency at which people save has also remained lower than in April and May with a rise in the number of people who save just occasionally or not at all.
Lee Raybould, head of savings at Nationwide, says: "It is worrying that a fifth of consumers - potentially 12 million people - never save.
"We are working hard to engage people about the importance of saving and look towards the Government to communicate to consumers about their schemes such as the Child Trust Fund and ISAs, which have the potential to make a real difference to household wealth.
"We hope to soon see consumers thinking Government policy does encourage them to save."
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