What Is VAT? How Value-Added Tax Works

This guide covers the concept and the machinery, not the rates. For the number that applies in one country, the European VAT rates by country guide holds the current figures and the UK VAT calculator does the arithmetic on a price. Two readers get different things from what follows. If you are a consumer, the sections on the chain, on who really pays and on inclusive pricing explain the line at the bottom of your receipt. If you run a business at or near a registration threshold, registration, invoices, returns and recovery are the operational core, and the sections on exemption and cash flow are where the money is quietly won and lost.

VAT in one sentence, and the ideas underneath it

HMRC puts it plainly: VAT is a tax added to most products and services sold by VAT-registered businesses, and the VAT you pay over is usually the difference between the VAT you have paid to other businesses and the VAT you have charged your customers¹.

The European Commission describes the same tax clause by clause, and each clause does work. VAT is an indirect tax borne by the final consumer; it is charged as a percentage of the sales price and collected fractionally at every stage of production and distribution; and it is neutral, because the tax the consumer bears is the same however many businesses the goods passed through². The EU VAT Directive defines it as a general tax on consumption exactly proportional to price, chargeable after deduction of the tax borne directly by the various cost components³. That deduction clause is the point: without it, tax would pile up on every transaction and punish long supply chains.

Why states like the design, and where it leaks

Rather than taxing households directly, the state deputises every registered business to collect a slice, so most of the money is banked before the goods reach a shop. That is far harder to lose than a single-point retail tax, and it is one reason more than 140 countries use a VAT, including every OECD member except the United States⁷. Neutrality is the design goal rather than a guarantee: the three places where it leaks — exemption, blocked input tax and unregistered suppliers in the middle of a chain — are exactly where VAT stops being a flow-through and starts behaving like a cost. Each of them gets its own section below, because between them they account for most of the money businesses lose to VAT.

A short history, and why the dates matter

The current rulebook, Council Directive 2006/112/EC, is a recast of the founding directives of 1967 and the Sixth Directive of 1977³. The United Kingdom introduced VAT through the Finance Act 1972, which charged no tax on any supply before 1 April 1973⁸; the present 20% rate came from section 3 of the Finance (No. 2) Act 2010 and applies from 4 January 2011⁹. A supply is taxed at the rate in force at its tax point, not the invoice date — the trap US sellers meet in rate change effective dates.

How the VAT chain works, stage by stage

The clearest way to understand VAT is to run one product through a chain and watch the money move. The table travels from forestry to a consumer at the UK standard rate of 20%, every price net of VAT. Each business charges VAT on what it sells, reclaims the VAT on what it bought, and sends HMRC the difference.

Read the last column alone and the design is obvious. The four businesses paid £40, £60, £60 and £40 — £200 in total. The consumer paid £1,200 at the till, of which £200 was VAT. The two figures are identical, and neither was computed from the other: the state collected exactly 20% of the final consumer price, in four instalments, from four companies, none of which bore any of it.

Worked at the UK standard rate of 20%⁴; the credit mechanism follows the deduction rule in the VAT Directive³.

Each bar is 20% of that stage's own value added. The sawmill turned £200 of timber into £500 of planks, adding £300, and paid £60. The furniture maker added another £300 and also paid £60. The retailer added £200 and paid £40. Nobody ever computes it that way — the tax lands on value added as an arithmetic consequence of charging on sales and deducting on purchases — but it is the reason the tax carries that name.

Input VAT and output VAT are one tax seen from two ends

Output VAT is what you charge customers; input VAT is what suppliers charged you. The £100 the sawmill charged is output VAT on the sawmill's return and input VAT on the furniture maker's. That symmetry makes the system auditable — every deduction claimed should match a charge declared elsewhere, which is why authorities cross-match returns. Note what the furniture maker never did: it did not calculate its own value added, and did not need to know what the timber cost. It read two totals off its own books.

What breaks when one link is not registered

Suppose the sawmill sits below the threshold and is not registered. It cannot charge VAT, which sounds like an advantage, and it cannot reclaim the £40 it paid on timber, which is not: that £40 stops being a flow-through and becomes a cost buried in its price. Hold every selling price constant to isolate the effect. Forestry still pays £40, the sawmill pays and reclaims nothing, the furniture maker has no input VAT to deduct and hands over the full £160 rather than £60, and the retailer still pays £40. HMRC collects £240 instead of £200 on the same chain, and the extra £40 is tax charged on tax — the cascade the credit mechanism exists to prevent.

Who pays VAT, and who only collects it

The consumer bears VAT; the business collects and remits it². Bearing it and being liable for it are not the same thing, and confusing them is the most expensive mistake a new registration makes.

The person on the hook is what the Directive calls a taxable person: anyone who independently carries out an economic activity, whatever its purpose or results³. Profit, size and intent are irrelevant, so a business trading at a loss is still a taxable person and one that failed to register does not escape the tax it should have charged. The European Commission put the EU VAT compliance gap for 2023 at €128 billion, or 9.5% of total VAT liability¹¹ — the reason for so much policy energy on e-invoicing, the subject of VAT in the Digital Age.

Registration: when a business must start charging VAT

Registration turns a business from a payer of VAT into a collector of it. The UK applies two tests continuously. Backward: register once taxable turnover for the last 12 months goes over £90,000. Forward: register if you expect it to exceed £90,000 in the next 30 days alone. On the backward test you register within 30 days of the end of the month you went over, and your effective date is the first day of the second month after that⁵. A business passing £90,000 during March registers by 30 April and is registered from 1 May, so it owes VAT on May sales whether or not the number arrived in time — both tests are in the UK VAT registration threshold guide.

What counts as taxable turnover

Taxable turnover is everything you sell that is not exempt or outside the scope: standard-rated, reduced-rated and zero-rated sales all count, exempt and out-of-scope sales do not¹². So a bookseller whose entire range is zero-rated still counts every sale towards £90,000 and must register, while an insurance broker earning exempt commission may never have to, however large it grows.

Voluntary registration, overseas sellers, and coming back down

Below the threshold you may register voluntarily⁵, which pays when customers can deduct what you charge and you carry meaningful input VAT. If taxable turnover falls below £88,000 you can ask HMRC to cancel, and you must cancel within 30 days if you stop being eligible at all or risk a penalty¹³. One rule catches out sellers who assume a threshold protects them: a business based outside the UK supplying goods or services to the UK must register regardless of turnover⁵.

EU thresholds and the SME scheme

EU thresholds are national and vary widely, so there is no single European equivalent of £90,000. Since 1 January 2025 a cross-border scheme has changed the picture for small traders¹⁵: a business can be exempt in another member state if its turnover there stays under that country's national threshold — capped at €85,000 — and its total EU-wide turnover stays under €100,000. It gets an identification number with an EX suffix and files a single quarterly report at home¹⁴.

The rate categories, and what each one really means

The UK runs three rates plus two kinds of exclusion, and the rate is a property of the goods or services rather than of the customer. Getting the category right is the first decision in every VAT question that follows⁴.

Categories and examples from HMRC guidance on rates of VAT for different goods and services¹⁶ and on VAT rates⁴, as of August 2026.

The EU framework is a constrained menu rather than a free choice: a standard rate no less than 15% with no maximum, up to two reduced rates no lower than 5% across up to 24 categories listed in Annex III, and since the 2022 reform one super-reduced rate below 5% plus one zero rate across at most seven categories covering basic needs⁶. Current figures sit in European VAT rates by country, with national detail in TVA in France, IVA in Italy, IVA in Spain and Swedish moms, and a wider comparison in the global tax rates dataset.

Zero-rated versus exempt: the split that decides input VAT recovery

A zero-rated sale and an exempt sale both put no VAT on the customer's invoice, which is why they are constantly confused. The difference is invisible to the customer and decisive for the seller, because it decides whether the VAT on the seller's own costs can be recovered. VAT Notice 700 states it directly: on zero-rated supplies no VAT is payable but the supplier keeps the right to recover the VAT on its own business expenditure, while on exempt supplies no tax is payable and the supplier cannot normally recover any of the VAT on its own expenses¹⁰.

Distinctions per VAT Notice 700¹⁰; turnover treatment per HMRC¹². Exemption is usually bad news for the seller. A bookshop selling zero-rated books charges no VAT and still reclaims the VAT on its rent, shelving, software and electricity; an insurance broker earning exempt commission charges no VAT either, but every one of those costs arrives with irrecoverable VAT attached.

Partial exemption, and the de minimis rescue

Most businesses making exempt supplies also make taxable ones, and are partly exempt. Input tax then splits three ways: attributable to taxable supplies and recoverable, attributable to exempt supplies and not, and residual overhead tax that must be apportioned. The standard method apportions the residue by value — taxable supplies over total supplies, both excluding VAT, rounded up to the next whole number¹⁷.

The firm recovers all £8,500 rather than £7,600 because of the de minimis rule: exempt input tax is recoverable in full if it is no more than £625 a month on average and no more than 50% of total input tax in the period¹⁷. Here the exempt input tax is £900 for the quarter, which averages £300 a month, comfortably under £625; and £900 against total input tax of £8,500 is well under half. Both tests pass, so the business is treated as fully taxable for the quarter. Now let the exempt line grow until exempt input tax reaches £2,100 in a quarter: the monthly average becomes £700, the first test fails, and the whole £2,100 is written off to cost — a £2,100 swing caused by crossing a £625 line. Both conditions have to be satisfied in every period, and the failure is a cliff rather than a slope, which is why the calculation is worth running before the quarter closes rather than after.

What a VAT invoice has to show

The invoice is the instrument that makes deduction possible. Without a valid one the buyer generally cannot recover the tax, which is why the required contents are prescribed rather than suggested, and why HMRC requires a VAT invoice to be issued within 30 days of the tax point¹⁰. A full UK VAT invoice must show all of the following¹⁰.

• An identifying number, sequential in practice so that gaps are visible
• Your name, address and VAT registration number
• The customer's name and address
• The invoice date, and the tax point where the two differ
• A description sufficient to identify the goods or services supplied
• The quantity of goods or extent of the services, line by line
• The unit price and the amount payable excluding VAT, per rate
• The rate of VAT applied, shown separately where a supply spans rates
• The amount of VAT chargeable, in sterling
• The total amount due including VAT

Retailers get relief: a less detailed VAT invoice may be issued where the VAT-inclusive price does not exceed £250¹⁰, which is why a coffee-shop receipt carries a VAT number and a gross total but no customer name. The EU imposes equivalent particulars through the Directive's invoicing rules³. Records must be kept at least six years, or ten if you use the One Stop Shop, with a VAT account showing total VAT sales, total VAT purchases, VAT owed and VAT reclaimable¹⁸. Before zero-rating a cross-border business supply, check the customer's number with the HMRC service or VIES; the Canadian equivalents are in GST/HST on Canadian invoices.

VAT returns: the boxes, the deadlines and the penalties

A VAT return is an arithmetic summary, not a narrative. The UK standard accounting period is three months, and the deadline for filing online is one calendar month and seven days after the period ends, which is also the payment deadline; a return is due even when there is nothing to pay or reclaim¹⁹. Under the EU Directive the tax period is one, two or three months and may not exceed a year³. The nine boxes run as follows; 2, 8 and 9 concern Northern Ireland movements of goods²⁰.

• Box 1 — VAT due in the period on sales and other outputs
• Box 2 — VAT due on acquisitions of goods into Northern Ireland from EU states
• Box 3 — total VAT due, being boxes 1 and 2 added together
• Box 4 — VAT reclaimed in the period on purchases and other inputs
• Box 5 — net VAT to pay or reclaim, being box 3 minus box 4
• Box 6 — total value of sales and all other outputs excluding VAT
• Box 7 — total value of purchases and all other inputs excluding VAT
• Box 8 — value of goods and related costs supplied to EU member states
• Box 9 — value of goods and related costs acquired from EU member states

Box 6 catches people out: it is the value of all outputs excluding VAT, so it includes zero-rated, reduced-rated and exempt supplies and exports, not only the sales that carried standard-rate VAT²⁰.

Making Tax Digital, late filing and corrections

All VAT-registered businesses must keep digital records and file through compatible software: Making Tax Digital reached most registered businesses in April 2019 and the rest in April 2022, and its digital-links rule means data must move between programs electronically rather than by retyping²¹, as covered in Making Tax Digital for VAT. Late filing runs on penalty points: for periods starting on or after 1 January 2023 you get a point per late return, and at the threshold — two points annually, four quarterly, five monthly — a £200 penalty, plus £200 for each later late submission²². Late payment escalates separately: 3% of the VAT owed at day 15, a further 3% of what is outstanding at day 30, then from day 31 a second penalty accruing daily at 10% a year²³. A net error of £10,000 or less can be corrected on the next return, as can one up to £50,000 if it is under 1% of box 6, within a four-year window²⁴.

Reclaiming input VAT, and the costs you cannot reclaim

Recovery is the half of VAT that businesses under-use. The right to deduct applies to VAT on goods and services used for taxable business activities, evidenced by a valid VAT invoice³, within four years of the due date of the return on which you were first entitled to claim¹⁰. Some VAT is blocked however commercial the spend: anything bought only for personal use, business entertaining and hospitality, and anything used to make exempt supplies. Where an item is part business and part private only the business proportion is recoverable²⁵.

Cars are the classic trap: VAT on a car is fully recoverable only where the vehicle is used exclusively for business with no private use at all, or falls into a narrow set of uses such as taxis, driving instruction and self-drive hire. On fuel for mixed use you have a choice — reclaim all the VAT and pay a fuel scale charge, or reclaim only the business mileage and keep records good enough to prove it²⁵. Pre-registration costs reach back further than most new registrations realise: goods still held at registration qualify if they were supplied not more than four years before, and services if supplied not more than six months before the business was registered or was required to be¹⁰ — which for a company that spent heavily on equipment before it started trading is a real cheque. When input VAT exceeds output VAT, a common position for exporters, zero-rated traders and businesses in a capital-spending year, box 5 becomes a repayment and HMRC pays the difference¹; the Canadian equivalent works on the same logic and is covered in input tax credits in Canada.

The cash-flow reality: VAT is not your money

The commonest way a small business gets into trouble with VAT has nothing to do with rates. Output VAT arrives with the sale and leaves months later, and in between it looks exactly like working capital. The tax point is usually the invoice date, so you can owe VAT on an invoice the customer has not yet paid. Three mechanisms close that gap, each a timing fix rather than a discount. The Cash Accounting Scheme, open at taxable turnover of £1.35 million or less, moves both sides onto payment dates²⁶. The Flat Rate Scheme, for turnover of £150,000 or less, swaps the calculation for a fixed percentage of turnover but blocks input VAT except on capital assets over £2,000²⁷. Bad debt relief recovers VAT paid over on an invoice never settled, once the debt is six months overdue and written off²⁸.

Cross-border VAT: exports, imports and the place of supply

VAT follows consumption. Within the EU it is charged and due in the country where the goods are consumed by the final consumer, and no VAT is charged on exports to countries outside the EU because the tax falls due on import instead³².

Goods leaving and entering the United Kingdom

Exports can be zero-rated, but only against evidence: three months to export the goods and three months to obtain valid proof, or six months where the goods are processed first, and if you miss it you account for VAT at the UK rate in box 1²⁹. On the way in, postponed VAT accounting lets the importer, once registered here, declare and recover import VAT on the same return instead of paying at the border³⁰. Consignments of £135 or less sold directly to customers in Great Britain carry UK supply VAT at the point of sale, unless the customer gives their UK VAT number and applies the reverse charge³¹.

The EU rules a seller meets first

Sell goods to a business in another member state holding a valid VAT number and you charge no VAT; the customer applies the reverse charge at home. Sales to consumers run on a single EU-wide threshold of €10,000 covering distance sales of goods and telecommunications, broadcasting and electronic services — below it you may keep charging your own country's VAT, above it the customer's rate applies³². Since 1 July 2021 the One Stop Shop lets a seller register in one member state and account there for VAT due across the EU, with the Import One Stop Shop doing the same for consignments not exceeding €150³³, as set out in the EU VAT OSS and IOSS guide.

Services, and the reverse charge

Services follow their own place-of-supply rules: the general business-to-business rule puts the supply where the customer belongs, the general business-to-consumer rule where the supplier belongs³⁴. So a London design studio billing a German company for a rebrand makes that supply in Germany and charges no UK VAT; billing a German consumer for the same work, it charges UK VAT at 20%. When a British business receives services from a supplier abroad the reverse charge applies and, in HMRC's words, the customer must act as if they are both the supplier and the recipient of the services³⁴. You post output tax and input tax for the same amount, so a fully taxable business nets to nil and a partly exempt one does not — the entry and the conditions are in the reverse charge explained.

VAT-inclusive prices: how to add and remove VAT from a price

In the UK and across the EU, consumer prices are advertised with the tax already inside them. That is a legal requirement rather than a convention: the Price Marking Order 2004 defines the selling price as the final price for a unit of a product, including VAT and all other taxes³⁵. So a £30 shirt is £30 at the till, and the VAT has to be extracted rather than added.

1. Identify the rate that applies to the supply. Establish whether the item is standard-rated, reduced-rated, zero-rated or exempt in the country of supply. Get this wrong and every later step is wrong, and the rate is a property of the goods or services rather than of the customer.
2. To add VAT, multiply the net price by one plus the rate. At the UK standard rate of 20%, multiply by 1.20: a net price of £250 becomes £300 including VAT, of which £50 is VAT. At a 5% reduced rate you would multiply by 1.05 instead.
3. To remove VAT, divide the gross price by one plus the rate. Divide, never subtract the percentage. £300 divided by 1.20 is £250 net and the £50 difference is the VAT. Taking 20% off £300 gives £240, which overstates the reduction and understates the tax.
4. Check the answer with the VAT fraction. The VAT fraction is the rate divided by 100 plus the rate, which is one sixth at 20% and one twenty-first at 5%. One sixth of £300 is £50, matching step three, so the arithmetic holds.

The shortcut in step four is the VAT fraction, defined by HMRC as the rate of tax divided by 100 plus the rate of tax — one sixth at the 20% standard rate¹⁰. It gives the VAT inside a gross figure in one operation, which is why retailers apply it to daily gross takings.