CIL surcharges, interest and late payment

A CIL surcharge for late payment is not a penalty the authority chooses to impose. The Community Infrastructure Levy Regulations 2010 set the figures, and the collecting authority applies them once the trigger occurs. Start work without serving a commencement notice and the surcharge is 20 per cent of the chargeable amount or £2,500, whichever is lower. Miss the payment date by 30 days and a 5 per cent surcharge attaches, with interest running from the day the money was due.

Self-builders get caught most often, usually by the paperwork rather than by the money. The exemption is generous and the procedure is unforgiving.

How liability becomes payable

The sequence is fixed by the regulations and every stage has a document.

1. Permission is granted and the collecting authority issues a liability notice setting out the chargeable amount and who it thinks is liable.
2. Someone assumes liability in writing before development starts, using the assumption of liability form.
3. A commencement notice is served on the authority before the first day of work, stating the intended start date.
4. The authority issues a demand notice setting out the amount and the payment date or instalment dates.
5. Payment falls due, generally within 60 days of the start of development unless an instalment policy applies.

Each of those steps carries a consequence if missed, and the consequences are cumulative. A self-builder who starts work without assuming liability, without a commencement notice and without having completed the exemption paperwork can end up with the full charge plus two surcharges.

Keep the liability notice. It is the document every later step refers back to, and the appeal grounds on the chargeable amount run from the date it was issued.

Surcharges for failing to assume liability or notify

The regulations set out a schedule of surcharges, each tied to a specific failure. The amounts below are those in the regulations as amended, and the current version should be checked because the levy has been amended repeatedly.

The commencement notice surcharge is the one that stings on a small scheme, because the £2,500 cap is higher than the levy itself on many extensions and conversions. A householder who would have paid nothing after an exemption can face a charge for the procedural failure alone.

Surcharges are imposed by notice, and the authority has to tell you the amount and the reason. They are added to the amount payable rather than charged separately.

Interest on late payment

Interest accrues on any unpaid amount from the day after it became due, at a rate set in the regulations as 2.5 percentage points above the Bank of England base rate.

Two consequences follow. Interest runs on surcharges as well as on the levy itself, so a procedural failure compounds. And because the rate floats with base rate, a liability carried for two years can accumulate meaningfully more interest than the same liability would have done a decade ago.

Where a disqualifying event removes an exemption, the full amount becomes payable and interest runs from the date set out in the demand notice that follows. Selling a self-build dwelling within three years of completion is the classic example.

Enforcement powers available to the authority

The levy is a local land charge and the enforcement powers behind it are stronger than most applicants expect.

A collecting authority can serve a CIL stop notice, which prohibits further development until payment is made and carries criminal liability for breach. It can apply to the magistrates' court for a liability order and then pursue the standard enforcement routes available for a judgment debt. It can register a charge against the land, which surfaces on sale and blocks completion. And it can recover from any person who has assumed liability, or from the landowner by apportionment where nobody has.

That last point matters for landowners selling with planning permission. Where the buyer does not assume liability, the regulations apportion it to the owners of the relevant land, and a seller who assumed liability and then sold can remain exposed. Deal with it in the contract, with a transfer of assumed liability and an indemnity.

Appealing a surcharge and the grounds

Surcharge appeals go to an appointed person at the Valuation Office Agency, and they have to be made within 28 days of the surcharge being imposed.

The grounds are narrow and procedural: that the claimed breach did not occur, that the authority failed to serve the liability notice it was required to serve, or that the surcharge has been calculated incorrectly. Hardship is not a ground. Nor is being unaware of the requirement, which is the argument most people want to make.

Separately, a disagreement about the chargeable amount itself starts with a request to the collecting authority for a review, made within 28 days of the liability notice, followed by an appeal to the Valuation Office Agency if the review does not resolve it. Appeals against a CIL stop notice go to the Secretary of State.

Read the deadlines carefully and diarise them. These time limits cannot be extended, and a well-founded objection raised a week late is worth nothing. The equivalent discipline applies to other formal planning applications with fixed procedures, as in budgeting a lawful development certificate application.

Instalment policies and missed instalments

Many collecting authorities publish an instalment policy allowing payment in two or three tranches tied to periods after the start of development. The policy is local, it is published on the authority's own website, and it can be changed.

The trap is in the default provisions. Missing one instalment typically makes the entire outstanding balance payable immediately, with late payment surcharges and interest on the whole sum rather than on the missed tranche. Build the instalment dates into the development cash flow as hard dates rather than targets.

An instalment policy usually applies only where liability has been assumed and a commencement notice has been served. Fail on either and the instalment option disappears, leaving the full amount due in 60 days.

Preventing the problem with notices

The whole of this subject is avoidable administration, and the prevention is a short checklist held by one named person on the project.

Confirm receipt of the liability notice and check the floor areas on it. Submit the assumption of liability form in the name of the entity that will actually own the land at the start of works. Submit any exemption claim and wait for the written decision before anything happens on site. Serve the commencement notice, and get an acknowledgement rather than assuming delivery. For a self-build exemption, calendar the deadline for the second part of the claim, which has to be submitted with the supporting evidence within six months of completion.

Then tell the contractor. The single most common cause of a lost exemption is a groundworker clearing the site a week before the paperwork was finished, which counts as the start of development. Site clearance, demolition, digging a trench or laying out a service run can all amount to commencement.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. If you are pricing the wider submission alongside the levy, see PlanScope pricing, and the way a fixed professional fee is built up is explained in what a planning agent's fixed fee includes.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.