The government is to add a new clause to the Brexit bill to rule out any extension to the transition period beyond the end of next year.
The post-Brexit transition period - due to conclude in December 2020 - can currently be extended by mutual agreement for up to two years.
But an amended Withdrawal Agreement Bill the Commons is set to vote on this week would rule out any extension.
The PM told MPs it would put an end to years of "deadlock, dither and delay".
As the House of Commons assembled for the first time since the election, Boris Johnson said his priority was to "get Brexit done". He also promised to seek "common ground" and to approach politics with a "new and generous spirit" after the rancour of recent years.
Jeremy Corbyn congratulated the Conservative leader on his victory but said he would be "judged" on whether he delivered on the "many, many promises" he had made during the campaign, including to longstanding Labour voters.
The UK is set to leave the EU on 31 January, more than three and a half years after the public backed Brexit in a referendum.
Soon after, the two sides will begin talking about their future economic relationship, including controversial areas such as fishing rights, consumer and environmental standards and financial services.
Trade deals typically take many years to conclude and senior EU figures are sceptical that a deal can be agreed within that time. If it is not, the economic relationship will default to World Trade Organization (WTO) terms, with the likelihood of tariffs on imports and exports.
The EU's chief negotiator Michel Barnier said the bloc would "do the maximum" to finalise the deal in time. Asked about the UK's refusal to contemplate any extra time for the talks, he said "it is the British choice to choose the procedure it wants".
The UK is set to leave the EU on 31 January, more than three and a half years after the public backed Brexit in a referendum.
Soon after, the two sides will begin talking about their future economic relationship, including controversial areas such as fishing rights, consumer and environmental standards and financial services.
Trade deals typically take many years to conclude and senior EU figures are sceptical that a deal can be agreed within that time. If it is not, the economic relationship will default to World Trade Organization (WTO) terms, with the likelihood of tariffs on imports and exports.
The EU's chief negotiator Michel Barnier said the bloc would "do the maximum" to finalise the deal in time. Asked about the UK's refusal to contemplate any extra time for the talks, he said "it is the British choice to choose the procedure it wants".