The Government has not done enough to properly prepare existing benefit claimants for the changes brought by the new Universal Credit, according to research by Citizens Advice (CAB).
Almost half of those on benefits felt unready to claim online and 22% did not have the right banking facilities, the community charity discovered.
Conversations with more than 1,000 of Citizens Advice's clients in affected parts of the country exposed how little help some people were getting.
Citizens Advice chief executive Gillian Guy said: "For Universal Credit to be the revolutionary reform ministers promised, we desperately need to know how people moving onto the new benefit are going to be supported."
More top news
Southern areas windy and very mild.
Nobel-prize-winning schoolgirl Malala Yousafzai has said she is a proud Brummie, as a new portrait of her was unveiled in her adopted home.
The Filipino girl group lost out to Lauren Murray in the sing off after receiving the lowest number of votes.