Britain has said more than £700 million is to be spent on building new infrastructure, hiring staff and developing technology to ensure its border systems are fully operational when the UK leaves the EU at the end of the year.
Cabinet Office Minister Michael Gove said the major investment would ensure traders and the border industry are able to "manage the changes and seize the opportunities" when the transition period ends in December.
The £705 million package includes £235 million for staffing and IT systems, and £470 million for port and inland infrastructure to ensure compliance with new customs procedures and controls.
New border infrastructure will be built inland where there is no space at ports, while ports will get one-off financial support to ensure the right infrastructure is in place.
The funding relates only to the implementation of the British-EU border, and the UK is expected to publish its specific guidance and measures for Northern Ireland in the coming weeks.
Mr Gove said: "We are taking back control of our borders, and leaving the single market and the customs union at the end of this year bringing both changes and significant opportunities for which we all need to prepare.
"That is why we are announcing this major package of investment today.
"With or without further agreement with the EU, this £705 million will ensure that the necessary infrastructure, tech and border personnel are in place so that our traders and the border industry are able to manage the changes and seize the opportunities as we lay the foundations for the world's most effective and secure border."
The transition period is set to end at the end of December 2020, when the UK will leave the single market and customs union.
Martin rules out 'divisive' border poll
The Taoiseach has ruled out a border poll as "far too divisive at this stage".
Micheál Martin said that instead, he wants to focus on building relationships to share the island of Ireland "in peace and harmony".
The new Government includes an all-island unit in the Department of the Taoiseach "to develop fresh thinking around that".
H told BBC's Andrew Marr Show: "I want to inject greater greater momentum into the north-south dimension of the Good Friday Agreement, in terms of practical, pragmatic economic projects and activity that we can get under way.
"I think, to me, a border poll is far too divisive at this stage, it doesn't deal with the more fundamental issue of how we continue to live and work together as we all live on this island, particularly in a post-Brexit scenario."
Mr Martin also said more detail is needed on arrangements following Brexit. "I think there has been some progress in terms of a paper that the UK Government published, but we do need more detail, we need more precision.
"I think we need an injection of momentum into the overall talks between the European Union and the United Kingdom in relation to Brexit," he said.
"I had a very fruitful discussion with the Prime Minister, Boris Johnson, after I took office. I think we both agreed that it's in everybody's interest, particularly in terms of businesses and giving them certainty, that we get a good comprehensive trade deal between the UK and European Union."
The Taoiseach said he believes the European Court of Justice is just one of "a number of sticking points" in discussions.
He said he sees no sense in a no-deal Brexit and that workers will suffer if that is the case.
"I think there will be a deal. There has to be a deal. It can't be at any price. My obligation as Taoiseach is to think of the people of Ireland."