The manifesto includes measures to ensure banks can’t charge customers unfairly for going over their limit or bouncing a cheque.
Other policies include a cap on interest rates charged by credit cards and store cards, and real terms cuts in rail fares.
Commenting, Nick Clegg said:
“A Liberal Democrat government will legislate to ensure that no bank can charge its customers unfairly for going over their limit or bouncing a cheque.
“Banks should, of course, be able to pass on the costs they incurn in dealing with these problems.
“But they should not be able to profiteer from customers making small mistakes. We will outlaw unfair charges from now on.
“Bank bosses should look to their consciences and give back the money they took from their customers in unfair charges."