A freeport is a designated area where different customs rules and a package of tax reliefs apply. The UK has 12 of them — eight in England, two Green Freeports in Scotland and two in Wales. The reliefs are real and substantial, but they only apply inside a tax site, and the English ones have a sunset of 30 September 2031.
Where they are
The eight English freeports are East Midlands, Freeport East, Humber, Liverpool City Region, Plymouth and South Devon, Solent, Teesside and Thames. Scotland has two Green Freeports — Forth, and Inverness and Cromarty Firth. Wales has Anglesey and Celtic.
Each freeport has up to three tax sites, selected by local councils, sitting inside a much larger outer boundary. That distinction is the one businesses most often get wrong: being within the freeport's outer boundary does nothing. The reliefs attach to the designated tax sites, which are specific and comparatively small.
Tax sites and customs sites are different things
Customs sites are secure areas within the wider freeport where different customs rules apply, designed to support international trade. Operating one requires Authorised Economic Operator status and passing an HMRC security assessment.
Tax sites are separate designated geographic areas — the economic engine of the freeport — carrying the tax and National Insurance reliefs. A site can be one, the other, or both. If the question is about tax relief, the answer turns on tax site designation, and the official maps are the only reliable way to check whether a specific address qualifies.
The five reliefs
Stamp duty land tax relief (England only). Full relief on the whole purchase price where at least 90% of the land qualifies for a commercial use; partial relief where 10% to 89% qualifies; no relief below 10%. Qualifying uses are a commercial trade or profession, development or redevelopment for resale, or letting to others — non-residential only. A three-year control period follows the purchase, and if qualifying use ceases the relief is withdrawn with tax payable within 30 days unless reasonable steps are taken. Scotland and Wales give the equivalent through LBTT and LTT relief.
Enhanced structures and buildings allowance. 10% of qualifying expenditure a year for 10 years, against the standard 3% over 33⅓ years. On a £5 million qualifying build that is the difference between relief inside a decade and relief spread across a generation.
Enhanced capital allowances. A 100% first-year allowance on qualifying plant and machinery, claimed against the profits of the qualifying activity.
Employer National Insurance relief. A zero rate of secondary Class 1 on earnings up to the Freeport and Investment Zone Upper Secondary Threshold of £25,000 a year (£2,083 a month, £481 a week), for 36 months from the start of each eligible employee's employment. Conditions: the employee must spend at least 60% of their working time in the designated site, and must not have been employed by that employer or a connected employer in the previous 24 months. It applies to employments starting on or after 6 April 2022. Earnings above the threshold attract secondary Class 1 at 15% from 6 April 2025, and since that date employers claiming must report a workplace postcode in their payroll data.
Business rates relief. 100% relief on qualifying new hereditaments, and relief for existing businesses expanding into new hereditaments or occupying space for the first time following development. It runs for five years from the point each beneficiary first receives it.
The dates that matter
The reliefs are time-limited, and the sunset differs by nation:
- English freeport tax sites — 30 September 2031, for SDLT relief, enhanced SBA, enhanced capital allowances, employer NICs relief and business rates relief;
- Scottish Green Freeports — 30 September 2034;
- Welsh freeports — 30 September 2034;
- Investment Zone tax sites — 30 September 2034.
Business rates relief in England has its own mechanic worth noting: it must first be claimed on or before 30 September 2031, and relief claimed on the last day then runs for five years to September 2036. Each relief runs from the date its tax site designation took effect to the applicable end date.
One caution: the England-only business rates guidance cannot be read across to Scotland or Wales, where rates are devolved and the terms need checking against a devolved source.
Investment Zones are a separate regime
England has eight Investment Zones — East Midlands, Greater Manchester, Liverpool City Region, North East, South Yorkshire, West Midlands and West Yorkshire, with Tees Valley prospective — each receiving up to £160 million over 10 years.
They carry the same five-relief package, but only inside designated special tax sites, and not every Investment Zone has one. Three of the seven established English zones have tax sites: Liverpool City Region with three, the North East with two and the West Midlands with two, making seven designated sites in total. A business told it is "in an Investment Zone" may be nowhere near a site that confers relief.
Whether it is worth it
The reliefs are genuinely valuable for capital-intensive projects hiring locally — enhanced SBA and 100% first-year allowances on a new facility, plus three years of NIC relief on each new hire, adds up quickly. What they do not do is make a marginal location decision sensible. The site constraint is real, the 60% working time test has to be evidenced, and the SDLT control period claws relief back if the use changes.
So the sequence is: confirm the exact address sits in a designated tax site; model the reliefs against the actual capital and hiring plan; and check the sunset against the project timetable, because a 2030 build in an English freeport has very little runway left. Our guides to NI category letters and the capital allowances regime cover the payroll and claim mechanics.
Acumon advises businesses investing in freeport and Investment Zone sites through capital allowances, SDLT and business tax work, with payroll management for the NIC relief and its reporting. If you are choosing between two sites and one is inside a tax site, that comparison is worth modelling properly before the lease is signed.