Overage and Clawback Explained for Landowners

Key points

Overage is a right to a further payment if land you sell later gains value, usually through a planning permission or a resale.
Clawback normally describes the same idea and is often used where public bodies or charities sell land.
A workable overage clause defines the trigger, the share, the period, how value is measured and which costs can be deducted.
Overage needs to be properly secured so it binds future owners, and the method differs across the UK.
HMRC can tax the value of a right to future overage when the land is first sold, so speak to an accountant before agreeing terms.

What are overage and clawback?

Overage is an extra payment a seller receives if land they have sold later rises in value, usually because it gets planning permission or is resold. Clawback normally means the same thing, though the term is often used when public bodies or charities sell land. Both let a seller share in future uplift.

Overage is set out in the sale contract and, ideally, secured on the land so that it binds future owners. The detail matters: a vague clause can be hard to enforce, while an aggressive one can make the land hard to sell or finance.

When is an overage clause used?

A landowner sells without planning permission but wants a share if permission is granted later.
A homeowner sells part of a garden and wants to share in any extra homes approved. See our guide to selling part of your garden.
A public body or charity sells below full development value and needs to protect its position.
A seller wants protection if the buyer resells quickly at a profit.
Executors or trustees selling family land want to protect beneficiaries if the land later gains value.
A buyer and seller cannot agree today's price and use overage to bridge the gap.

What triggers an overage payment?

The trigger is the event that makes the payment due. Common triggers include:

the grant of planning permission, often defined as a permission that can be implemented and is free from legal challenge;
the start of development under that permission;
a sale of the land, or part of it, with the benefit of planning permission;
the sale of the completed homes.

Clear definitions avoid disputes. A clause needs to say what kind of permission counts, and whether a permission for a different use, or for more homes than expected, is caught. Some changes can also happen under permitted development rights without a full planning application, so the clause should say whether those count as well.

How is the overage payment calculated?

Element	Common approaches	What to watch
Base value	The price paid, or the value without the new permission	How and when the base is measured
Uplift	Value with permission minus the base value	The valuation date and assumptions
Share	An agreed share of the uplift, or a fixed sum per home	Whether the share changes over time
Deductions	Planning costs, Section 106 or similar obligations, infrastructure	Which costs count and how they are evidenced
Disputes	Referral to an independent expert	Who appoints the expert and who pays

Some clauses also deal with VAT and with interest on late payment. The share and period are negotiated case by case, and there is no standard figure. Our guide on how development land is valued explains how uplift arises.

How long does overage last?

The overage period is agreed between the parties and varies widely. It usually runs from completion of the sale. A longer period protects the seller for longer but may put off buyers and lenders. A shorter period gives certainty but may end before planning is achieved. The period is easier to agree when it fits realistic planning timescales for the site, taking account of where the council is in reviewing its local plan.

Some clauses reduce the seller's share in steps as time passes. This recognises that the further away a permission is, the more of the effort and risk the buyer has carried. A stepped share can make overage easier for both sides to accept.

How is overage secured on the land?

England and Wales: a promise to pay money does not automatically bind later owners of freehold land. Sellers commonly protect overage with a restriction on the title at HM Land Registry, so a future sale cannot be registered unless the new owner signs a deed agreeing to the overage. A legal charge is another option. The title register shows any restrictions already in place.

Scotland: overage is usually contractual and may be backed by a standard security over the land. Local authorities and the Scottish Ministers can also use an economic development burden, which can include an obligation to pay a sum of money.

Northern Ireland: the mechanics differ again, and a solicitor will advise how to protect overage on a title registered with Land & Property Services.

How does overage compare with other ways of sharing in planning uplift?

Overage is one of several ways a landowner can benefit from planning value. The difference is mainly about timing and control:

Overage: you sell now and receive a further payment later if a defined event happens.
Option agreement: you keep the land, and the developer buys later at a price set by a valuation formula.
Promotion agreement: you keep the land until it is sold on the open market after permission is granted.
Conditional contract: the sale only completes if planning permission is granted, at a price agreed now or set by formula.

Overage can suit sellers who want money now but do not want to give away all of the future upside.

How is overage taxed?

HMRC's guidance on land disposals with unascertainable deferred consideration explains that, where the transactions in land rules do not apply, the value of the right to future overage payments is usually included in the gain on the original sale. Each later payment is then treated as a disposal of part of that right. Where the transactions in UK land rules do apply, the profit is generally taxed as trading income instead. A tax bill can therefore arise before any overage is received, so speak to an accountant before agreeing terms. Keep the original valuation of the overage right, because it will be needed when later payments arrive.

What should sellers and buyers watch out for?

Avoidance: selling the land in parts, transferring it to a related company or building fewer homes to dodge a trigger. Good drafting anticipates this.
Information: the seller needs a right to be told about applications and sales.
Funding: lenders may be wary of overage that ranks ahead of their security.
Exit: a clause allowing a buy-out or release can help both sides.
Carve-outs: buyers often ask for certain dealings to be excluded, such as a mortgage of the land, a transfer to a utility company for a substation, or the sale of individual completed homes.

If you are thinking of selling land without planning permission and want to keep a share of any future uplift, raise overage when terms are discussed. A free site appraisal is a useful starting point.

Frequently asked questions

Is overage the same as an option agreement?

No. An option gives a buyer the right to purchase land in future, usually once planning is granted. Overage applies after a sale has completed: you have already sold the land, but you keep a right to a further payment if a defined event happens, such as a new planning permission. Some deals use both, for example an option with overage on any later permissions.

Can an overage be removed or bought out?

Yes, by agreement. The person who benefits from the overage can release it, usually in return for a payment, and the restriction or charge protecting it is then removed from the title. Some clauses include a buy-out mechanism from the start. Without agreement, the overage normally continues until it expires, or until the trigger happens and the payment is made.

Does overage put developers off buying land?

It can, if the clause is unclear, lasts a very long time or takes a large share of the uplift, because it adds risk and can complicate funding. A clear, proportionate clause with sensible deductions and a defined period is usually workable. Overage is a common negotiating point on land sold without planning, so most buyers expect to discuss it.

Do I need overage if my land already has planning permission?

It is less common, because the planning uplift is already reflected in the price. A seller may still want overage if a buyer could later secure a bigger or more valuable scheme, such as more homes or a different use. Whether it is worth negotiating depends on the site, the price and how likely a further permission is.

Sources

This guide is general information about how land and housing processes usually work. It is not legal, tax or financial advice. Rules differ between England, Wales, Scotland and Northern Ireland and change over time, so take advice from a solicitor, accountant or land agent on your own situation.

Overage and clawback: how they work when you sell land