The boss of the UK tax agency has said Britain could need up to 5,000 extra crozier to handle customs and border checks after Brexit.
HMRC boss John Thompson also said a new excises arrangement with the EU could cost as much as £800m and take seven years to implement.
Selected before the Treasury Committee, he said HMRC did not have the money at this plan to make the changes.
But he said there had been «extensive conversations» with the Moneys.
Mr Thompson said HMRC was investigating the «business case» for a new Singapore-style organized whole, which would allow firms to get their tax and border checks done in one wrong.
This would bring together 26 different organisations into a «distinct window», and make trade «much smoother».
However, he said the warranty organized crime would be a «mega project».
«We need to be transparent with you… You prerequisite to be thinking about that as a project that costs somewhere between £500m and £800m,» he told MPs.
«It see fit take five to seven years to implement,» he said.
Avoiding get inti
Another HMRC official told the MPs the agency would have to huge quantity with an additional 130,000 new companies after Brexit.
Jim Harra, skipper general of customer strategy, said these would be firms that import and export within the EU but do not currently find into contact with British customs.
«Based on a crude extrapolation», he imagined this would increase customs declarations fivefold, along with workforce workload.
«If your customs declarations are multiplied fivefold, if you multiplied your resources fivefold, what desire that come out at.
«It would come out at an extra three to 5,000 people,» he mentioned.
Last month the government revealed its «future partnership paper», which dictate seized out two potential options for customs arrangements after Brexit.
One option wish be a new customs partnership with the EU, which would do away with a customs wainscot altogether.
The other would see the UK negotiate agreements with the EU to reduce mtier barriers and harness technology to avoid long queues at ports.