How Does VAT Work?

Value Added Tax collects revenue at every stage of production while ensuring that only the final consumer actually pays it. The mechanism is elegant and the arithmetic catches almost everyone out at least once.

The chain

A simplified example at 20 percent.

A timber merchant sells wood to a furniture maker for 100 plus 20 VAT. The merchant hands that 20 to HMRC.

The furniture maker builds a chair and sells it to a shop for 300 plus 60 VAT. They owe HMRC 60, but reclaim the 20 they already paid, so they hand over 40.

The shop sells the chair for 500 plus 100 VAT. They owe 100, reclaim the 60 they paid, and hand over 40.

HMRC has received 20, 40 and 40, totalling 100. That is exactly the VAT on the final sale price. Every business in the chain has passed through the tax without bearing it, and the customer has paid the whole 100.

This is why it is called value added tax: each business pays tax on the value it added, and the total equals the tax on the final value.

The rates

• Standard rate, 20 percent. Most goods and services.
• Reduced rate, 5 percent. Domestic fuel and power, children’s car seats, some energy-saving materials, some mobility aids.
• Zero rate, 0 percent. Most food, books, newspapers, children’s clothing, public transport, prescription medicines.

Separately, some supplies are exempt: insurance, most financial services, postage stamps, education and some healthcare.

Zero-rated against exempt

These look identical to a shopper and are entirely different for a business.

A zero-rated supply is inside the VAT system at a rate of nothing. The business charges no VAT but can still reclaim the VAT on its own purchases. A bakery selling zero-rated bread reclaims the VAT on its ovens and its electricity.

An exempt supply is outside the system. The business charges no VAT and cannot reclaim on related costs, so that VAT becomes a real expense it must absorb or build into prices.

The distinction decides whether VAT is neutral for the business or a genuine cost.

The arithmetic that trips people

To add VAT at 20 percent: multiply the net price by 1.2.

100 × 1.2 = 120.

To remove VAT from a gross price: divide by 1.2, not subtract 20 percent.

120 ÷ 1.2 = 100.

Subtracting 20 percent from 120 gives 96, which is wrong by 4. The percentage was applied to the smaller number, so reversing it is not symmetrical.

To find the VAT inside a gross price: divide by 6.

120 ÷ 6 = 20.

That shortcut works because at 20 percent, the VAT is one sixth of the gross. For the 5 percent rate, the VAT is one twenty-first of the gross.

Registration

A business must register once its taxable turnover passes the registration threshold within any rolling twelve-month period, or if it expects to pass it in the next 30 days. The rolling test catches people out, since it is not based on the accounting year.

Below the threshold, registration is voluntary and sometimes advantageous. If your customers are VAT-registered businesses, they reclaim whatever you charge, so your prices effectively stay the same to them while you gain the ability to reclaim VAT on your own costs.

If your customers are consumers, registering means either raising prices by a fifth or absorbing the tax out of your margin. That is why many small businesses serving the public stay deliberately below the threshold.

What registration involves

Charging VAT on everything standard-rated, issuing VAT invoices showing the rate and your registration number, keeping digital records, and filing returns, usually quarterly.

Returns declare the VAT charged on sales and the VAT paid on purchases, and you pay the difference or reclaim it. Several simplified schemes exist for smaller businesses, including a flat rate scheme that trades a simpler calculation for a slightly less favourable result.

Why the exceptions are so odd

The zero-rated list is a political artefact accumulated over decades, which is why it contains distinctions that make little sense from the outside.

The most cited example is that food is generally zero-rated while confectionery is standard-rated, which has produced genuine legal disputes over whether particular products count as cakes or biscuits, with substantial sums resting on the answer.

Children’s clothing is zero-rated up to certain sizes, which means an identical garment can carry VAT or not depending on the label.

What it means as a consumer

Advertised prices to consumers must include VAT, so the figure on the shelf is what you pay. Prices quoted to businesses often exclude it, which is why a quote can arrive 20 percent higher than expected.

When comparing quotes, check whether each is inclusive or exclusive. It is the single most common source of confusion in a builder’s estimate or a supplier’s proposal.