Voters are confused over new ID rules just days before local government elections, researchers have warned.
The elections on 4 May will be the first time showing photo ID at polling stations will be compulsory.
Research by Ipsos found 85% of people registered to vote are likely to bring the correct form of photo ID.
Accepted forms of ID include a passport, driving licence and blue badge parking permit, but a third of adults in England wrongly think a student card or their poll card will be accepted, rising to 42% of 18-34 year olds and half of ethnic minorities.
Nearly a quarter incorrectly think a council tax bill will be accepted and more than a third said they had not heard enough about new voter ID requirements.
Ipsos research director Keiran Pedley said: ‘With polling day around the corner, there is still clearly some confusion about which forms of ID will be accepted to allow people to vote.'