Published: 23:40, 07 February 2021
| Updated: 07:29, 08 February 2021
The Waterbrook Park site has been set up to deal on a temporary basis with customs checks on hauliers and to ensure they have the correct documentation.
But data invoices published by HMRC reveal the cost to the taxpayer is running into millions of pounds.
To date, £5,797,440 has been paid by way of rental costs.
According to invoices, in December, the site's owners - GSE Truckstop Developments - were paid £736,560 for renting the land.
In November, two payments were reported - one of £736,560 and a second of £712,800.
No payment was listed in October, but in September, two payments were recorded: one for £712,800 and a second for £736,500.
The same sum was reported in June invoices and in May.
The Waterbrook site is currently acting as a Brexit customs facility while work is continuing at the nearby purpose-built Sevington lorry park, which is due to become fully operational at the end of the month after heavy rain delayed its construction.
Cllr Paul Bartlett (Con) - the deputy leader of Ashford Borough Council - said: “All I can really say is that it would have been a commercial deal between a willing and owner and a willing tenant.
"The only other thing that you could say from the government's point of view you is that they will be collecting a lot of tax from lorries now that we are out of the EU.
"But we need the infrastructure and so we have had to pay for it.”
In a statement, HMRC said: "In July 2020, the government committed to spending £470m on new border infrastructure to support ports in building extra capacity where there is space to do so, and, if necessary, to build additional inland sites across the country."
“We will continue to monitor spends associated with the inland border facilities and will work to ensure they provide value for money.”
He told the cross-party transport select committee that he had seen little evidence of congestion or long queues of traffic, as many had predicted.