Tax When You Sell Land for Development: A Plain-English Guide

Selling land with planning permission can turn a modest asset into a large sum of money in one transaction. The tax on that transaction, and the effect on your inheritance tax position afterwards, can be significant. Some of the most useful planning, such as transfers between spouses or reviewing how land is held, has to happen well before the sale, not after it.

This guide explains the main taxes in plain English. It is general information, not advice. Everyone's position is different, and the right answer depends on how the land is owned, how it has been used, and what you plan to do with the money.

When you sell land for more than you paid for it, or more than its value when you inherited it, the profit is a capital gain. For individuals in the 2026/27 tax year:

Gains are added to your other income for the year to work out which rate applies. For a large land sale, most of the gain will usually fall above the basic rate band and be taxed at 24%.

The gain is the sale price, less your base cost and allowable costs. Your base cost depends on how you came to own the land:

• Bought it: what you paid, plus purchase costs such as legal fees and Stamp Duty Land Tax, and the cost of capital improvements.
• Inherited it: its value at the date of death, the figure used for probate. This is why the probate valuation of land with development potential matters years later.
• Received it as a gift: usually its market value at the date of the gift.
• Owned since before 31 March 1982: its market value on that date is normally used instead of the original cost.

Allowable costs on the sale include your legal and agent fees. Costs paid by the buyer, such as the planning work under an option, are not your costs and do not reduce your gain.

Granting an option is itself a disposal for Capital Gains Tax purposes. If you receive an option fee on signing, it is normally taxable in the tax year you receive it, as a gain with little or no base cost set against it.

If the option is later exercised, the grant and the exercise are treated as a single transaction. The option fee becomes part of the sale proceeds, and the tax on the earlier fee is recalculated as part of the sale, with credit for tax already paid. If the option is never exercised, the fee stays taxed as a separate gain in the year you received it.

HMRC's own manual describes it this way: once the option is exercised, the grant stops being a separate occasion of charge, so any tax paid on it has to be set off or repaid. There is no special form for this. You or your accountant tell HMRC, usually through the tax return for the year of exercise.

For Capital Gains Tax, the date of disposal is normally the date the contract becomes unconditional. Under an option, that is usually when the option is exercised, not when the money arrives on completion. If exercise and completion fall either side of 5 April, the tax year and the payment date can surprise people.

Bare land and farmland are not residential property for the 60-day UK property reporting rules, so for UK residents the gain is usually reported through Self Assessment, with tax due by 31 January after the end of the tax year. Check this with your adviser, especially if any buildings on the site are dwellings.

Because our agreements set out clear milestones, you will know well in advance when an option might be exercised, which gives you and your accountant time to plan.

Business Asset Disposal Relief (BADR) can reduce the rate on qualifying business disposals to 18%, up to a lifetime limit of £1 million of gains. It is often misunderstood by farming families.

Selling a field on its own is generally not enough. The relief usually needs a disposal of the whole business or a distinct part of it, or an associated disposal alongside that, and there are conditions about how long the business was run and how the land was used. If you are retiring from farming at the same time as selling land, it is worth asking whether the sale could qualify. Take specific advice before assuming it applies.

Many landowners assume farmland is free of inheritance tax. Two points are often missed.

APR Only Covers Agricultural Value

Agricultural Property Relief relieves the value the land would have if it could only ever be used for agriculture. HMRC's own manual confirms that relief is not available on the excess, such as hope value or development value. Business Property Relief may cover it, but only if the land is genuinely used in a qualifying business.

The £2.5 Million Cap From 6 April 2026

The amount of property that qualifies for 100% Agricultural and Business Property Relief is now capped at £2.5 million per person, with 50% relief above that, an effective 20% inheritance tax rate on the excess. The allowance is transferable between spouses and civil partners.

Cash Does Not Qualify

Once land becomes cash, the cash does not qualify for either relief. A family that sells development land and keeps the money may find its inheritance tax position is worse afterwards. Timing a sale, and planning what happens to the proceeds, is often as important as the Capital Gains Tax bill itself.

Before and After a Sale: An Illustration

The table compares the same owner in two situations. In the first, they die owning land that has planning permission but is not yet under a binding contract. In the second, they sell, pay the Capital Gains Tax, and die holding the cash. It assumes the nil-rate band is used by other assets, there is no spouse or civil partner to inherit, the land is farmed and qualifies for APR on its agricultural value, and BPR does not apply.

The gap comes from two rules. There is no Capital Gains Tax on death, and the family inherits the land at its market value, so a sale soon afterwards produces little or no gain. And once the land is sold, the cash has no relief at all.

This does not mean holding on is always right. Nobody can plan the date of their death. The family may need the money now, planning permissions expire, land values can fall, and cash can be given away or spent during a lifetime in ways land cannot. Inheritance tax on land can also be paid in instalments over ten years. The point is that the sale decision and the inheritance tax plan belong in the same conversation with your adviser.

• Spouses and civil partners. Transfers between spouses living together are usually made on a no gain, no loss basis. Transferring a share of land before a sale can let both use their annual exempt amount and basic rate band. It must be done properly and in good time, and it has to be a genuine transfer.
• Brothers, sisters and other co-owners. Each owner is taxed on their own share of the gain, with their own allowance and rates. Owners in different tax positions may pay different rates on the same sale.
• Trusts. Land held in trust is taxed under the trust rules, which have different rates and allowances. Trustees should take advice early.
• Partnerships and companies. Land held in a farming partnership or a company is taxed differently again. A company pays Corporation Tax on its gains, and getting the money out to shareholders is a separate question.

Two Joint Owners, Two Tax Bills

A brother and sister inherit a field in equal shares and sell it for £900,000 in 2026/27. The probate value was £100,000 and the sale costs are £12,000. Each is taxed on half, using their own annual exempt amount and their own basic rate band. The sister has £20,000 of other income that year. The brother earns £60,000.

The example also shows why a spouse transfer made in good time can help a little but rarely transforms the bill on a large sale. Most of the gain still falls above the basic rate band. Where it helps more is in using a second annual exempt amount and band on smaller gains, and in spreading gains across tax years where the deal allows it.

• Transactions in UK land rules. Where land was acquired or developed mainly to make a profit on sale, the gain can be taxed as income rather than capital. This is rarely an issue for long-held family land, but it can be for land bought recently with development in mind.
• VAT. If the land has been opted to tax, VAT may apply to the sale price. The buyer will want to know early.
• Overage. A later overage payment is usually taxed when it is received or becomes due, depending on how it is structured. See our guide to overage.
• Stamp Duty Land Tax. This is paid by the buyer, not by you as the seller.
• Pensions and investments. What you do with the proceeds affects both income tax and inheritance tax. Many families take financial advice at the same time as tax advice.

• Who legally owns the land, and in what shares?
• What is the base cost, and how was the land valued if it was inherited?
• Has the land been used in a farming or other business, and for how long?
• Is anyone retiring or winding down a business at the same time?
• Would a transfer between spouses make sense, and when would it need to happen?
• Has the land been opted to tax for VAT?
• What is the likely timing of exercise and completion, and which tax years do they fall in?
• What will happen to the proceeds, and how does that affect inheritance tax?

Our agreements set out clear milestones, so you know well in advance when an option might be exercised and when completion is likely. We also contribute to your own professional fees so that your advisers can review the terms, including the tax position, before you sign.

If you would like a first conversation about your land, ask for a free review.