The option could represent millions of extra pounds for charities, according to its developer, payroll giving agency the Charities Trust.
"In 2005, payroll giving donations in the UK reached almost £100m, according to the Institute of Fundraising," said Jason Doherty, the trust's marketing manager. "If every donor signed up and agreed an increase of only 3 per cent, it would deliver £3m in additional revenue."
The trust will introduce the facility, known as The Xtra Factor, to employees at Home Retail Group, the parent company of Argos and Homebase. An annual rise of 3 per cent will be suggested, but donors will be able to choose their level of increase. "We have wanted to do this for a while, but we have been waiting for the right client," added Doherty.
Tina Steele, payroll giving project manager at the Institute of Fundraising, said she welcomed the initiative. "I hope that this will be a success," she said.