The Herd Basis Election for Farmers Explained (2026/27)
How the herd basis election lets UK livestock farmers treat a production herd as a capital asset rather than trading stock, keeping herd sales out of Income Tax profit calculations.
Why Livestock Valuation Creates a Tax Problem
Most farm trading stock β crops, animals reared for slaughter β is valued at the end of each accounting period, and any increase in value between periods normally counts as part of that year's trading profit for Income Tax. For a herd kept for years, not months, that creates an odd result: if the herd's overall value rises simply because animals have matured or breeding stock has increased, a farmer could face a tax bill on a gain that exists only on paper, with no actual sale having taken place.
What the Herd Basis Changes
Making a herd basis election under Self Assessment removes a qualifying production herd from the normal trading-stock valuation rules. The herd is instead treated broadly like a capital asset:
Self-Employed Tax Calculator
Calculate income tax, Class 2 and Class 4 National Insurance for self-employed and sole traders for 2025/26.
Model your farm's Self Assessment profit- Year-on-year increases in herd value are not taxed as trading profit.
- The cost of replacing individual animals that die, are culled or sold from the herd is an allowable revenue expense in the normal way.
- A sale of the whole herd, or a substantial part of it, is treated outside the ordinary trading-income calculation β broadly as a capital matter rather than a straightforward trading receipt.
Which Herds Qualify
The herd basis is specifically for a "production herd" β animals kept mainly for what they produce over an extended period, such as:
- Dairy herds kept for milk
- Breeding herds and flocks kept for offspring
- Stud animals kept for breeding fees
It does not apply to animals bought in and reared purely to be sold for meat β those remain ordinary trading stock, valued and taxed under the normal rules each year.
Making the Election
The election is made to HMRC as part of Self Assessment, usually with support from a farm-specialist accountant given how much detail depends on the specific herd, its history and the farm's wider trading position. Time limits apply, broadly tied to the accounting period in which the herd was first kept, so this is not a decision to leave until the last minute.
Sources
Frequently asked questions
What is the herd basis election?
It's an election under Self Assessment that lets a farmer treat a production herd (animals kept for what they produce β milk, wool, breeding β rather than for sale as meat) as a capital asset rather than trading stock, so the herd itself sits outside the normal Income Tax profit calculation.
Why would a farmer want to use the herd basis?
Without it, a rising herd valuation between accounting years can be taxed as trading profit even though no animals were actually sold, creating a tax bill on an unrealised paper gain. The herd basis avoids taxing that notional increase in herd value.
Is the herd basis election permanent once made?
Yes, for a given class of herd it is normally irrevocable while the farmer keeps that herd, which is why the decision is usually made early and reviewed carefully with an accountant rather than changed year to year.
Does the herd basis apply to all farm animals?
No β it only applies to a 'production herd' kept for the products it yields over time, such as a dairy herd, breeding flock or stud herd. Animals reared and sold for meat (trading stock in the ordinary sense) are not eligible.
What happens when animals are culled or replaced under the herd basis?
The cost of replacing an animal that dies or is culled is generally an allowable revenue expense, while proceeds from selling the whole herd (or a substantial part of it) are treated as a capital receipt rather than trading income, which is the core benefit of the election.
Does the herd basis affect Capital Gains Tax?
It changes how herd disposals interact with Income Tax profit, but detailed CGT treatment on a full herd sale is a specialist area β a farm accountant should confirm the position for a specific herd before a large disposal.
Related reading
Profit Averaging for Authors and Artists (2026/27)
How self-employed authors, composers and other creators can average fluctuating profits over two years for Income Tax, smoothing the tax hit from a single big advance or royalty year.
Dental Technician Self-Employed Tax Guide UK (2026/27)
How self-employed and freelance dental technicians in the UK are taxed on lab work for dentists, and which materials, equipment and GDC costs are allowable expenses in 2026/27.
Farmers' Profit Averaging Relief Explained (2026/27)
How farmers can average trading profits over two or five years to smooth out volatile harvests and prices, reducing the higher-rate Income Tax spikes that uneven profits can cause.