Assuming CIL liability, and what happens if nobody does
The Community Infrastructure Levy falls on the landowner by default. How the assumption of liability form works, what the surcharges cost, and why relief claims depend entirely on sequence.
Submit an assumption of liability form and you choose who pays the Community Infrastructure Levy. Do nothing, and the charge lands on whoever owns the land when work starts, apportioned between them by the collecting authority, with surcharges on top and no right to pay by instalments. For a self-builder that difference can be the whole levy, because the self-build exemption is only available to someone who has assumed liability first.
The form is CIL Form 2. It takes ten minutes. The consequences of skipping it run for years.
Who pays if nobody signs
The Community Infrastructure Levy Regulations 2010 put liability on the owner of the relevant land by default. Owner for these purposes means a person with a material interest, which is a freehold or a leasehold with more than seven years left to run at the point the levy becomes payable.
Where more than one person holds a material interest and nobody has assumed liability before work starts, the collecting authority apportions the charge between them by reference to the area of land each one owns. That apportionment is the authority's calculation, not a negotiation.
The practical effect on a small site is predictable. A landowner who sold with an overage agreement, a builder with a licence to occupy and a funder with a charge all end up arguing about a charge that one assumption of liability form would have fixed on the developer.
Reading the liability notice
The authority issues a liability notice as soon as practicable after the day planning permission first permits the chargeable development. Read it the day it arrives, because it is the document that sets the numbers you will be held to.
What to check:
- The chargeable floorspace. Gross internal area of the new build, and the existing floorspace being offset.
- The rate applied, against the charging schedule and the zone the site sits in.
- The indexation figure used, which the Regulations tie to a published index.
- Whether any relief or exemption has been recognised.
- The payment procedure, including whether the authority's instalment policy applies.
Errors in the existing floorspace offset are the most common and the most valuable to correct. If a building has been in lawful use for a continuous period of at least six months in the three years before permission first permits development, its floorspace should be deducted. Challenge the figure in writing straight away rather than at the demand stage.
A liability notice is also registered as a local land charge, so it will surface on every subsequent search.
Assuming liability, and the form that does it
Anyone can assume liability, whether or not they own the land. A developer, a contractor, a self-builder or a company set up for the project may all do it, and the assumption can be made at any time up to the day work starts.
The form is Form 2, Assumption of Liability, submitted to the collecting authority, which is normally the district or unitary council rather than the county. Keep the acknowledgement. On a project with any complexity, it is worth sending the form by email and retaining the delivery confirmation, because the whole relief regime turns on sequence and dates.
Form 6 is the separate notice telling the authority the date work will start. It must be submitted before that date, and the instalment policy only operates where it has been. Councils are not obliged to chase it.
The cost of leaving it
Surcharges are set by the Regulations and are applied by the authority as a matter of administration rather than discretion. The figures below are those in the Regulations as amended, and because the Regulations have been amended repeatedly, confirm the current position before relying on any of them.
| Failure | Surcharge |
|---|---|
| Nobody has assumed liability when work starts | £50 for each person liable |
| The authority has to apportion liability between owners | £500 for each owner |
| No notice of the start date before work begins | 20 per cent of the chargeable amount or £2,500, whichever is lower |
| Payment overdue by 30 days | 5 per cent of the outstanding amount |
| Still overdue at six months, and again at twelve | A further 5 per cent on each occasion |
Late payment also carries interest at 2.5 percentage points above the Bank of England base rate. And the loss of instalment rights is often the bigger problem, because it converts a staged payment into a single sum due shortly after work starts, at the point in a project where cash is tightest. Our note on highway works costs in a development appraisal makes the same point about front-loaded outgoings.
Beyond surcharges, the authority can serve a stop notice prohibiting development until payment is made, and can recover through the courts.
Transfers and withdrawals
An assumption of liability is not a life sentence. It can be withdrawn by notice to the authority at any time before the day work starts, which is useful where a sale falls through or the project vehicle changes.
Liability can also be transferred to another person using the transfer form, provided the transfer is made before the final payment date and the authority is notified. Both parties sign. This is the mechanism to use when a site is sold with permission in place and the buyer takes on the levy, and it should be dealt with in the sale contract rather than left to goodwill after completion.
What you cannot do is transfer liability after the final payment date, or retrospectively undo an apportionment the authority has already made.
Relief depends on getting the order right
The self-build exemption, the residential annexe and extension exemptions, social housing relief and charitable relief all share a structure. Liability must be assumed, the claim must be made on the correct form, the authority must acknowledge it, and only then can work start.
Get that order wrong and the relief is at risk. Where it has already gone wrong, the position has been amended more than once since 2010 and the outcome depends on which version applies, so take advice on the current Regulations rather than working from a forum post.
For self-builders there is a second stage. The exemption has to be confirmed after completion, within the period the Regulations specify, with evidence that the dwelling is your sole or main residence. Missing that stage claws the levy back in full. Diarise it on the day you claim.
Multi-party sites and records
On anything involving more than one interest, keep a single file containing the liability notice, the assumption of liability and its acknowledgement, the start notice, any relief claim and acknowledgement, every demand notice, and the payment receipts. Record the gross internal area calculation and the existing floorspace evidence with it.
Three habits that prevent most disputes:
- Deal with levy liability expressly in every option, sale and building contract, naming who assumes it and when.
- Reconcile the chargeable area against the approved drawings after any section 73 variation, because a variation can create a new chargeable amount.
- Tell your funder about the levy and its timing, since a demand notice arriving before the first drawdown is a familiar way to stall a small site.
Levy liability belongs in the appraisal at the same level of care as build cost, and it is worth testing against the scheme's margin early, as our note on viability appraisal sets out.
If you are about to start on site, check today whether Form 2 has been submitted and acknowledged. Nothing else available on a small development buys as much protection for as little effort. You can also browse the report types by category to see what else your application pack needs.
This is general guidance, not legal advice. Check the position with your collecting authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Who is liable for CIL if nobody assumes liability?
The owners of the relevant land. Owner means a person with a material interest, which is a freehold or a leasehold with more than seven years remaining. Where several people hold material interests, the collecting authority apportions the charge between them by reference to the area each one owns.
When must the assumption of liability form be submitted?
At any time before the day work starts on site. Anyone can assume liability, whether or not they own the land, using CIL Form 2 submitted to the collecting authority. Keep the acknowledgement, because the whole relief regime depends on being able to prove the sequence of dates.
What surcharges apply if liability is not assumed?
The Regulations set a surcharge of £50 for each person liable where nobody has assumed liability before work starts, and £500 for each owner where the authority has to apportion liability. Failing to give notice of the start date adds 20 per cent of the chargeable amount or £2,500, whichever is lower.
Can liability be transferred after permission is granted?
Yes, using the transfer of liability form, provided the transfer is made before the final payment date and the authority is notified. Both parties sign. Deal with it in the sale contract when a site changes hands with permission in place rather than leaving it to be sorted out afterwards.
Does the self-build exemption depend on assuming liability?
Yes. The exemption is only available to someone who has assumed liability, claimed on the correct form and received the authority's acknowledgement before starting work. There is also a second stage after completion, with evidence that the dwelling is your sole or main residence, and missing it claws back the levy in full.
Can I challenge the floorspace on a liability notice?
Yes, and you should do it in writing as soon as the notice arrives. The most valuable errors are in the existing floorspace offset: a building in lawful use for a continuous period of at least six months in the three years before permission first permits development should be deducted from the chargeable area.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.