The EU's Privacy and Communications Directive comes into force on 26 May.
It requires user's consent before using cookies - the text files that help organise and store browsing information.
Technically all firm must comply with the law but the UK has said that it needs more time to find a workable solution.
The government said that it was looking for a "business-friendly" solution and believed in light-touch regulation.
"We recognise that some website users have real concerns around online privacy but also recognise that cookies play a key role in the smooth running of the internet," said communications minister Ed Vaizey.
"But it will take some time for workable technical solutions to be developed, evaluated and rolled out so we have decided that a phased in approach is right," he added.
Cookie law deferred for one year | This is going to be a pain if it applies outside the EU.