Obtaining an IDP is a current standard requirement for drivers in some cases when travelling by auto outside of Europe.
But this could change if the United Kingdom departs on March 29 next year without a deal, according to a Government paper.
British passport holders, including holders of passports issued by Gibraltar, will be considered third country nationals under the Schengen Border Code and will therefore need to comply with different rules to enter and travel around the Schengen area.
Papers on driving licences, passports and phone bills are among the 30 or so technical notices that the government will release on Thursday, after the cabinet holds a special three-hour meeting to consider no-deal preparations in a discussion to be led by Brexit secretary, Dominic Raab.
According to the Schengen Border Code, third country passports must have been issued within the last 10 years on the date of arrival, and have at least 3 months' validity remaining on the date of intended departure from the last country visited in the Schengen area.
Brits hoping to travel to the European Union were also warned to make sure their passports were valid for the next six months - or renew now.
Under-16s, holders of a five-year British child passport must check the expiry date and make sure that there will be at least six months validity remaining on the date of travel.
'If your passport does not meet these criteria, you may be denied entry to any of the Schengen area countries, and you should renew your passport before you travel'.