Fuel tariffs which the government has made a decision to set at 0% if there is a no-deal Brexit, could lead to the closure of two United Kingdom oil refineries, costing 2,000 jobs and fuel shortages for the public.
There would likely be some form of hard border imposed on the island of Ireland, the document implied.
Senior officials there believe widespread checks will be necessary as current plans to avoid them will prove "unsustainable".
The UK will be hit with food, fuel and medicine shortages, a three-month period of chaos at its ports and a hard border in Ireland in a no-deal Brexit, leaked government documents have revealed.
"Now we've got a new Prime Minister who is very much focused on that and the scale and intensity of those preparations are increasing and we will be fully prepared to leave without a deal on October 31".
"This is the first time the industry is learning of any threat to fuel supplies - a particularly worrying situation, as this would affect the movement of goods across the country, not just to and from Europe, and could put jobs at risk throughout the sector which keeps Britain trading", a spokeswoman said.
The opposition Labour Party, which is trying to delay Brexit and organize a government of national unity, held up the report as another sign that no-deal must be avoided.
Stocks move higher to end turbulent week
The Dow Jones Industrial Average (DJIA) was down 800 points, NASDAQ down over 240 points, and the S&P 500 dropping 85 points. The yield rose as high as 1.54% by Thursday afternoon, though, which appeared to put some investors in a buying mood.
The forecasts compiled by the Cabinet Office set out the most likely aftershocks of a no-deal Brexit rather than the worst case scenarios, said the Times.
The EU struck a withdrawal agreement with Johnson's predecessor, Theresa May, but it was rejected three times by Britain's parliament.
He is expected to push for fresh negotiations over the terms of Brexit or warn that the European Union faces Britain crashing out of the bloc on October 31 - the latest delayed date for its departure.
Instead, it is thought the discussions will revolve around next weekend's G7 agenda - with topics including foreign policy, security, trade and the environment likely to dominate.
But Ms Miller said that whilst the Government had given a reassurance that Parliament will not be prorogued, she said she would be seeking further reassurance that MPs would be able to pass legislation to stop a no-deal Brexit.
"For example, on the delays at the port we asked if they had discussed their expectation with the port authorities of Calais/Pas du Nord who had already said that there would be no extra delays at Calais and they said, (after a great deal of shuffling of feet) "no".