Prime minister May announced the delay at the weekend during an EU summit held in Sharm el Sheikh.
Ministers had been expecting to have their say during a Commons vote this week.
It follows the votes of February 14 when May was given a mandate to return to the EU and seek amendments to Britain’s exit deal with regards to the Irish backstop.
Should May fail to secure new terms with EU leaders, she will aim to push through the deal a second time, albeit open to amendments.