Guide to the community infrastructure levy charging schedule

Think of a Community Infrastructure Levy (CIL) charging schedule as a council's price list for new development. It's a simple idea: a transparent, fixed-rate document that tells you exactly how much you'll be charged per square metre to fund essential local infrastructure like schools, roads, and health services.

Simple, right? But as with anything in property development, the devil is in the detail. Getting this wrong can seriously damage your appraisal.

What Is a CIL Charging Schedule?

We like to think of a CIL charging schedule as a restaurant menu for your scheme. Just like a menu lists the price for each dish, the schedule sets out the non-negotiable rate you'll pay for every square metre of new floorspace you build.

This upfront clarity is the whole point of CIL. It was designed to replace the often lengthy, unpredictable, and sometimes frustrating negotiations over Section 106 contributions. With a CIL charging schedule, you can see the cost on day one.

The Legal Framework and Its Purpose

The power for councils to do this comes from the Planning Act 2008. This legislation allows local authorities across England and Wales to introduce a levy to ensure new developments contribute fairly to the infrastructure needed to support them.

But a council can't just pick a number out of thin air. Each authority has to produce its own charging schedule through a tough, evidence led process. This involves rigorous economic viability testing to make sure the proposed rates don't actually stop development from happening.

For any developer, this document is one of the first and most critical pieces of due diligence. It directly answers the question: "How much is this going to cost me before I even break ground?" The rates can vary massively depending on a few key factors:

• Geographic Zones: A city centre zone with high land values will almost always have a higher CIL rate than a suburban or rural area.
• Type of Use: Councils set different rates for different types of development. Residential schemes usually attract higher charges than commercial or industrial projects.
• Strategic Sites: Large scale, designated development areas might even have their own bespoke CIL rates set within the schedule.

To give you a clearer picture, here are the core elements you'll typically find in a charging schedule and what they mean for your bottom line.

Key CIL Charging Schedule Components at a Glance

Component	Description	Why It Matters for Developers
Rate per Square Metre	The specific charge (£/sqm) for new gross internal area (GIA).	This is the headline figure. It's the core number that drives your entire CIL calculation and must be factored into your initial appraisal.
Differential Rates by Use	Different rates for various development types (e.g., residential, retail, office).	You need to apply the correct rate for your specific scheme. Misclassifying the use can lead to a completely inaccurate liability estimate.
Differential Rates by Zone	The charging area is often split into zones with varying rates based on viability.	The exact location of your site within the council's map determines the rate you pay. A site on one side of a road could have a different CIL liability than one on the other.
Instalment Policy	Rules defining if and how the CIL payment can be split over time.	This is crucial for your cash flow modelling. A policy allowing phased payments can significantly ease the financial burden during the construction phase.
Effective Date	The date the charging schedule officially came into force.	This date is the starting point for everything, especially when it comes to calculating indexation.

Understanding these components is non-negotiable for building a reliable financial model. Each element directly impacts the final CIL liability and, ultimately, your project's profitability.

Reading the Schedule and Indexation

Here’s a detail that catches out even experienced teams: indexation. The rates published in a charging schedule aren't frozen in time. They are designed to be adjusted annually for inflation using an official index, such as the RICS CIL Index.

This means the rate you see in a council's 2020 document is not the rate you’ll pay when your permission is granted in 2026. Your actual liability will be higher, and failing to model for this is a common and costly appraisal mistake.

Getting your head around this is fundamental. The charging schedule gives you the base rate, but you must apply the correct indexation formula to calculate the true cost at the point of planning consent. This simple but vital step is the bedrock of accurate financial modelling and robust planning and development appraisals.

How CIL Charging Schedules Are Created and Adopted

A Community Infrastructure Levy (CIL) charging schedule doesn’t just appear out of thin air. It’s the final output of a long, formal, and evidence heavy process. For anyone in development, understanding this journey is the key to anticipating costs and knowing when and how to push back.

It all starts when a local planning authority (LPA) looks at its Local Plan, tots up the cost of the new schools, roads, and health centres needed to support that growth, and finds a funding gap. That gap is the entire justification for bringing in CIL.

The Evidence Base and Viability Testing

Before a council can dream up any CIL rates, they have to build their case. This means compiling a mountain of evidence linking the development planned for the area with the specific infrastructure it will demand.

But the most critical piece for developers is the economic viability assessment. The council has to prove, with hard numbers, that their proposed CIL rates won't cripple development across their patch.

The whole point of CIL is to take a reasonable slice of the value uplift that planning permission creates. It's not supposed to be a tax so high that it stops development from happening in the first place. That principle is the main check and balance in the system.

This assessment involves modelling dozens of typical development schemes from a couple of houses to a large commercial block. They look at land values, build costs, and an assumed developer profit margin to land on a CIL rate that, in theory, most schemes can absorb without becoming unviable.

Consultation and Independent Examination

Once the council has a draft community infrastructure levy charging schedule, it goes out for public consultation. This is your window of opportunity. It’s when developers, landowners, and their advisors can get under the bonnet and challenge the council’s working.

You can argue their viability assumptions are flawed or that the proposed rates for a certain area are simply too high. Many developers submit their own viability reports to prove that a scheme just won't stack up with the proposed levy.

After this, the draft schedule along with all the objections is handed to an independent Planning Inspector. Their job is to act as a referee, checking if the council followed the rules and if their proposed rates are actually backed by the evidence. The Inspector’s recommendations are binding; the council must make the required changes before they can formally adopt the schedule.

Adoption, Indexation, and Review

With the Inspector’s blessing, the council’s elected members vote to adopt the charging schedule. From that day forward, it’s a legally binding charge on all new qualifying development.

But the rates aren't set in stone. This is where indexation comes in a detail that catches even experienced developers out.

1. Annual Adjustments: CIL regulations mandate that rates are increased each year to keep pace with inflation in build costs.
2. The Official Index: This is done using a national index, which is currently the RICS CIL Index, published annually.
3. The Impact: A rate set at £100 per square metre in a 2020 schedule will be noticeably higher by the time you get permission in 2026. If your appraisal doesn't account for this automatic uplift, you’re heading for a nasty surprise.

Finally, councils are supposed to review their CIL schedules every few years. A dramatic shift in the market, like soaring construction costs or a crash in land values, could trigger a full review to ensure the rates are still fit for purpose.

Keeping track of these moving parts across multiple council areas is a huge headache. It’s why having access to live planning intelligence for developers is no longer a nice to have, but essential for avoiding costly mistakes.

Getting CIL Calculations Right in the Real World

The theory behind a community infrastructure levy charging schedule is one thing. Actually calculating what you owe is where the numbers on a spreadsheet hit your bottom line. This is the moment a percentage on paper becomes a hard cost in your appraisal. Get this wrong, and it’s not just a rounding error it can sink a project’s viability entirely.

To understand the real liability, you have to look past the headline rate. A council's schedule is often a maze of different charges for specific zones and use classes. A residential scheme might face a huge CIL bill, while a commercial project two streets over could be zero rated.

The CIL Calculation Formula

On the surface, the calculation looks simple enough. It’s a basic formula combining the rate, the chargeable area, and the all important indexation factor.

Chargeable CIL = (CIL Rate £/sqm × Net Chargeable Area in sqm) × Indexation Factor

But don't let that fool you. The inputs are anything but straightforward. The CIL rate depends entirely on your site's location and proposed use, and you can often reduce the Net Chargeable Area by deducting existing, lawful floorspace. The real killer, though the one that catches almost everyone out is the indexation.

The Expensive Mistake of Ignoring Indexation

Indexation is the single biggest reason why just pulling up an old charging schedule is a dangerous and costly shortcut. The rates published when a schedule is first adopted are just a baseline. By law, they have to be adjusted every year to reflect inflation in construction costs.

We’re not talking about a minor tweak here. Over several years, the cumulative effect of indexation can inflate that original rate by a huge amount.

A CIL rate of £100 per square metre set in a 2020 schedule will not be £100 when you get planning permission in 2026. Failing to apply the correct index for the year permission is granted will leave a significant hole in your budget.

This is precisely where so many appraisals fall down. They use the out of date, unindexed rate from the original document. This creates a false sense of security and a real world liability that can be tens of thousands, or even millions, of pounds higher than you budgeted for.

A Practical Example: Zones and Indexation in Action

Let’s look at a real world case from the London Borough of Lewisham. Their community infrastructure levy charging schedule is a perfect example of how zones and indexation really work. The council uses a dual zone approach, meaning different parts of the borough have different CIL rates for the exact same use class.

When the schedule was introduced, the residential (Use Class C3) rate was £100 per sqm in Zone 1 and a lower £70 in Zone 2. But those are just the starting points. For a planning permission granted in 2026, those rates have been hit with significant indexation. Using the RICS CIL Index, which rose to 400 for that period, the original £100 rate in Zone 1 jumps to £154.44 per sqm. The £70 rate in Zone 2 climbs to £108.10 per sqm.

For a pretty standard 10,000 sqm residential project in Zone 1, that indexation alone pushes the CIL bill to over £1.5 million. You can find the full details in their official documentation and see for yourself how these figures change the game for different development types.

Of course, getting to these adopted rates in the first place is a long journey for the local authority, involving evidence gathering, consultation, and an independent examination.

This whole process is designed to ensure the final rates are backed by genuine infrastructure needs and have been tested for their economic impact.

Why This Granularity Is Non-Negotiable

These numbers show exactly why getting the calculation right is critical. An error of this size hammers your residual land value. It can easily make a viable scheme look unworkable, or even worse, lead you to overpay for land based on a fundamentally flawed appraisal.

For developers and lenders, this level of detail is everything. A platform like Domus helps by building these precise, indexed zonal rates directly into your financial models. It allows teams to:

• Stop Guessing: Automatically apply the latest indexed rates for any council area, without having to hunt down the right index yourself.
• Stress-Test Scenarios: Instantly see how the true CIL cost hits your margins and what it does to your land value.
• Produce Bankable Reports: Generate lender-ready appraisals with transparent, accurate, and auditable CIL calculations baked in.

Ultimately, mastering the practical side of CIL is about moving from guesswork to certainty. It’s about protecting your margins and making investment decisions with your eyes wide open.

CIL Reliefs and Section 106: What You Actually Need to Know

A Community Infrastructure Levy (CIL) charging schedule isn't just a bill to be paid. It's a set of rules you need to master. Getting it right means understanding your full liability, spotting opportunities for major savings, and navigating the tricky relationship between CIL and your other planning obligations.

First, let's be clear on who pays. The CIL liability falls on whoever formally tells the council they're taking it on by submitting an 'Assumption of Liability Notice'. This is usually the developer, but it could just as easily be a landowner or another partner. If no one steps up, the liability automatically defaults to the landowner.

The clock starts ticking the moment development formally commences. Once you serve that notice, the council issues a Demand Notice with the payment schedule. Get this bit of admin wrong, and the consequences are painful: think surcharges, losing the right to pay in instalments, and a demand for the full amount, right now.

Finding Savings Through Reliefs and Exemptions

While CIL often feels like a fixed, unavoidable tax, it isn't always. The regulations contain several crucial reliefs and exemptions that can cut your bill down significantly or even wipe it out completely. The catch? They aren't automatic. You have to apply, and you have to get the timing and the paperwork exactly right.

Key opportunities for savings include:

• Social Housing: Any part of a scheme that delivers qualifying social or affordable housing gets mandatory relief. For any mixed tenure project, this is absolutely critical for making the numbers work.
• Charitable Development: If a registered charity is building something to be used mainly for its charitable work like a new community hall they can claim relief.
• Self-Build Housing: Individuals building their own home get a full exemption from CIL. But there are strict procedural hoops to jump through, and you must live in the house as your main residence for three years.
• Residential Annexes and Extensions: Smaller domestic projects, like adding a ‘granny annexe’ or extending your home, are also exempt from the levy.

Understanding and properly applying for these reliefs is not just a box ticking exercise. For a housing association building a 100% affordable scheme, securing social housing relief means the difference between a viable project and one that never gets off the ground.

Securing any of these reliefs is all about procedural compliance. You have to submit the right forms before you start any work on site. It’s a classic trap: even if your scheme is eligible on paper, getting the timing wrong can make you lose the relief entirely.

CIL vs Section 106: A Clear Distinction

One of the biggest points of confusion for developers is how CIL interacts with Section 106 (s106) agreements. They’re both ways for councils to get contributions, but they are fundamentally different tools for different jobs.

Here’s a simple way to think about it: CIL is a general tax for the whole community, while an s106 agreement is a specific contract just for your site. CIL goes into a big pot to fund infrastructure that benefits the wider area, like a new school or road improvements. The rates are set in stone and aren't up for negotiation.

An s106 agreement, however, is a bespoke legal contract. It’s negotiated specifically to deal with the direct impacts of your particular development things the broad brush CIL payment can’t cover.

This table breaks down the key differences.

CIL vs Section 106: A Simple Comparison

Attribute	Community Infrastructure Levy (CIL)	Section 106 (s106) Agreement
Purpose	To fund broad, strategic infrastructure across the council's area.	To mitigate site-specific impacts of a development.
Nature	A fixed, non-negotiable charge based on a published schedule.	A negotiated legal agreement specific to the planning application.
Example	Funding a new health centre or a borough-wide cycle lane network.	Providing affordable housing on-site or funding a new pedestrian crossing directly outside the development.
Legal Test	The rate must be justified by infrastructure needs and viability evidence.	Contributions must be necessary, directly related to the development, and fairly related in scale.

This distinction is vital. Since CIL was introduced, the power of s106 has been deliberately scaled back. A council isn’t allowed to 'double-dip' they can't charge you CIL for a new school and then hit you with an s106 contribution for that same school. Mastering the boundary between these two is essential for any sharp negotiation and accurate financial modelling.

How CIL Impacts Your Financial Appraisals

A Community Infrastructure Levy (CIL) charge isn't some minor planning detail to be sorted out later. It’s a huge, ‘above the line’ cost that lands directly in your financial appraisal. It sits right there with your land and build costs, eating into the residual value of a site before you’ve even thought about profit.

Treating CIL as an afterthought is a recipe for disaster. We’ve seen promising deals turn sour because the liability was miscalculated. For any developer, lender, or underwriter, getting a precise, auditable CIL figure is non-negotiable from the very first look at a site.

The Land Value Squeeze

Think of your Gross Development Value (GDV) as a pie. Every cost build, fees, your own profit margin takes a slice. What’s left over is the residual land value. That’s the absolute maximum you can afford to pay for the land itself.

CIL carves out a massive slice right from the top. If that CIL bill comes in higher than you expected, it doesn't just chip away at your profit. It directly attacks the budget you have to acquire the site in the first place.

CIL isn't a soft cost or a contingency line item. It's a hard, unavoidable tax on development. If you don't model it accurately from day one, your entire financial appraisal is built on a foundation of sand.

This is why the numbers matter so much. If you overpay for land because your CIL estimate was too low, that money comes straight out of your pocket.

How Lenders Scrutinise CIL Assumptions

When your funding application hits a lender's desk, their credit team will go through your appraisal with a fine-tooth comb. Your assumptions around the community infrastructure levy charging schedule are one of the first things they'll check. They know just how fast an error here can kill a scheme.

Lenders need to see that you've got your story straight:

• Accurate Zonal Rates: Have you actually used the correct CIL rate for the specific charging zone your site falls into? It’s amazing how often this gets wrong.
• Correct Indexation: Is your calculation based on the latest indexation? They need to see the liability for the year you'll likely get permission, not today's number.
• A Clear Audit Trail: Can you show them exactly how you got to your CIL figure? A single number with no workings is a major red flag.

Getting this wrong signals a lack of rigour. It leads to delays while the lender's team unpicks and corrects your work. Worst case? They lose confidence and pull the funding offer completely.

A Real World Example: The Nine Elms CIL Explosion

To see just how painful this can get, look at the London Borough of Wandsworth. Their CIL charging schedule is a perfect example of how base rates and years of indexation can create eye watering liabilities.

In the high growth Nine Elms Residential Area A, the original unindexed rate was already a steep £575 per square metre. Fast forward to 2026, and with the RICS CIL Index hitting 400, that rate balloons to an incredible £1,031.39 per sqm. That’s a 79% increase.

For a 5,000 sqm residential scheme in that zone, the CIL liability would rocket past £5 million. That kind of figure crushes margins and demands incredibly robust financial modelling. You can see how Wandsworth has applied this indexation across its zones in their annual CIL rate summary.

This example from a real community infrastructure levy charging schedule shows why you can't afford to guess. It also highlights the urgent need for a tool that can handle these complex, location specific variables automatically, helping you understand your scheme's true viability.

The lesson is simple. CIL is a fundamental part of any credible financial appraisal. It dictates your land budget, shapes lender confidence, and can single-handedly decide if your project makes a profit. Modelling it with precision from your very first feasibility study isn't just best practice it's essential for survival.

Getting CIL Right: Why Your Spreadsheet Is Costing You Deals

Trying to calculate Community Infrastructure Levy liability from a patchwork of PDFs, out of date spreadsheets, and council websites is a high stakes gamble. We've seen it go wrong too many times. A developer uses the wrong zonal rate or applies an old indexation figure, and suddenly their appraisal is out by six figures. These aren’t just clerical errors; they are mistakes that kill deals and sink otherwise viable projects.

This old way of working creates enormous friction. Your team burns hours hunting for the right community infrastructure levy charging schedule, trying to decipher charging zone maps, and manually calculating indexation. It’s not just inefficient; it’s a minefield of potential errors. A single slip up can inflate your liability by hundreds of thousands of pounds, leading you to overpay for land or walk away from a good opportunity.

Bringing Planning and Viability Together

This is where a modern platform like Domus changes the game entirely. It’s not just another CIL calculator. It’s a completely different way of working that pulls live planning intelligence directly into your financial model, replacing manual lookups with an integrated system.

What does that mean in practice? It means the latest indexed CIL rates for any given borough, its specific charging zones, and its unique instalment policies are automatically fed into your appraisal. You no longer have to dig around for the right RICS CIL Index for the year permission was granted it's already there.

Take a borough like Tower Hamlets. The council’s 2026 CIL rates are based on an original RICS index of 334 but are now adjusted using the latest 400 index. For a mid sized project, that difference can mean a CIL bill of £2-3 million. A platform models this instantly, showing the true cost for residential, commercial, and strategic sites. You can dive into the specifics in the borough's official summary, which is just one of the 139 active CIL schedules across the UK that you need to track.

Move Faster, with Real Confidence

When your appraisal is connected to live data, you see the real time impact of the true CIL cost on your residual land value and profit margins. You can stress test different scenarios in minutes, not days. Want to know how a change in floorspace or use class affects your bottom line? The answer is immediate.

This creates a transparent, auditable trail that replaces guesswork with data driven confidence. For lenders and underwriters, this is the holy grail. Instead of trying to unpick a black box spreadsheet, they see a clear, logical calculation based on live, verifiable data.

The result is a huge acceleration in due diligence and a dramatic drop in errors. It allows you to make better, faster investment decisions. It frees up your team to move from spotting a site opportunity to making a confident, defensible investment decision in one seamless workflow.

CIL: The Common Questions That Catch People Out

The Community Infrastructure Levy trips up even experienced teams. It's not just another tax; it's a process with rigid deadlines and financial tripwires. Getting the details wrong can put a serious dent in your cash flow and even threaten a project's viability.

Here are the straight answers to the questions we see people stumble over most often.

When Does the CIL Bill Actually Land?

The charge becomes real the moment you formally commence development. Once your Commencement Notice is in with the local authority, they'll issue a Demand Notice.

This isn't a friendly reminder. It's a formal demand for payment with firm deadlines. It’s a critical cash flow event that you absolutely must have factored into your financial model from day one.

Can I Pay It in Stages?

Maybe. But you can't assume you can. The ability to pay in instalments hinges entirely on whether the local council has an instalment policy baked into its community infrastructure levy charging schedule. Many don't.

Where they do exist, the terms vary wildly. One council might let you split a £50,000 bill over 18 months; another might demand it all upfront. Checking for an instalment policy is a non-negotiable step in your early due diligence. It can be the difference between a manageable cash flow and a sudden, crippling funding gap right when you need capital for construction.

Always verify the local instalment policy early. Assuming you can phase payments when the policy doesn't exist can lead to a sudden, unbudgeted demand for the full CIL amount upfront, creating a serious funding crisis.

Can I Fight the CIL Charge?

You can’t argue with the rate—that's set in stone by the charging schedule. What you can challenge is the calculation of the final bill.

If you think the council has made a mistake, you can request a formal review. The most common errors we see are in:

• The total floorspace calculation.
• The indexation applied to the rate.
• The deduction for existing, lawful floorspace that's being demolished.

But you have to move fast. You typically only have 28 days from receiving the Liability Notice to request that review. Miss that window, and you’re stuck with their number, right or wrong.

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At Domus, we replace these uncertainties with a connected system. Our platform integrates live, indexed CIL rates and local policies directly into your financial appraisals, giving you and your lenders a single source of truth from day one. Move from site opportunity to a confident investment decision by visiting https://www.domusgroups.com.