Value Added Tax confuses newcomers for a specific reason: it appears on business invoices, businesses hand it over, businesses reclaim parts of it — so it looks like a tax on businesses. It is not. VAT is a tax on the final consumer, collected in instalments by every business along the chain, with each business paying over only the tax on the value it added. The name is the mechanism, stated plainly.
Once that flow is clear, the rest of VAT — registration, returns, the peculiar arithmetic of tax-inclusive prices — stops being a pile of rules and becomes one idea applied repeatedly. This article follows a product through three businesses to watch the tax move, then deals with the two computations every VAT-registered owner actually performs: building a gross price from a net figure, and recovering the net and the tax hidden inside a gross one.
Rates, thresholds and deadlines differ by country and change over time; nothing here substitutes for your own tax authority's current rules. What does not differ is the mechanism, and that is what this article is about.
Following one product through the chain
A timber merchant sells wood to a furniture maker for 100 plus VAT at 20%: invoice 120. The merchant hands the 20 to the tax authority. The maker turns the wood into a table and sells it to a retailer for 300 plus VAT: invoice 360. The maker has charged 60 of VAT on the sale, but does not hand over 60 — the 20 already paid on the timber is credited — so the maker pays 40, which is exactly 20% of the 200 of value the maker added. The retailer sells the table to a household for 500 plus VAT: invoice 600, VAT charged 100, credit for the 60 paid on purchase, pays over 40 — 20% of the retailer's 200 of added value.
Total the payments: 20 + 40 + 40 = 100, which is 20% of the final 500 price. The household, which can reclaim nothing, has borne the whole tax. Each business touched the money, accounted for it, and bore none of it — they bore the administration instead, which is the true cost of VAT to a business and the reason it deserves a clear-eyed article rather than resentment.
Adding VAT, and the direction nobody gets wrong
Building a gross figure is the easy direction: net × (1 + rate). A fee of 250 net at 20% is 300 gross, with 50 of VAT stated on the invoice as its own line. Invoices should always show the trio — net, tax, gross — because every party's bookkeeping needs all three, and because a customer entitled to reclaim needs the tax figure explicitly, not embedded.
Where a price is set gross-first — retail shelves, advertised consumer prices — the discipline runs the other way: the net is whatever is left once the tax is extracted, which the next section handles. Businesses that set consumer prices and treat the whole shelf price as their revenue are overstating their income by the VAT fraction, a bookkeeping error that produces a genuinely nasty surprise at the first return.
Extracting VAT: divide, never subtract
Here is the error that outsells all others combined. A receipt totals 120, VAT at 20% included. How much VAT is inside it? The instinctive answer — 20% of 120 is 24 — is wrong. The tax was charged on the net, so the gross is 120% of the net, and the tax is one-sixth of the gross, not one-fifth: 120 ÷ 1.2 = 100 net, VAT inside = 20. Subtracting the percentage from the gross over-removes tax that was never charged on itself.
The general method is division by (1 + rate), and the tax fraction of any gross figure is rate ÷ (1 + rate) — at 20%, the famous “divide by six” shortcut every bookkeeper knows. At 5% the fraction is 5/105, at 18% it is 18/118. Any calculator worth using performs this division rather than the subtraction, and any spreadsheet you inherit should be checked for which of the two it is doing, because the subtraction version is distressingly common in templates passed between businesses.
Rates, zero-rating and exemption: three different animals
Many VAT systems charge several rates at once — a standard rate, reduced rates for essentials, and a zero rate for categories like most food or exports in some countries. Zero-rated supplies are still taxable supplies at 0%: the business charges no VAT but can still reclaim VAT on its costs, and must still register and file. Exempt supplies are outside the tax altogether — and the sting is that a business making exempt supplies generally cannot reclaim the VAT on costs attributable to them. Zero-rated and exempt sound like twins in casual conversation; in the accounts they are nearly opposites.
Partially exempt businesses — selling a mix of taxable and exempt — face apportionment calculations that are a recognised specialism, not a detail. The general lesson for the rest is simpler: the rate is a per-product, per-country fact that must be looked up and recorded, not a constant of nature. Build your price lists with the rate as a visible column, and a rate change becomes an edit rather than an excavation.
Key takeaways
- VAT is borne by the final consumer and collected in slices; each business pays over the tax on the value it added, crediting the VAT it paid on inputs.
- Add VAT by multiplying the net by (1 + rate); extract it from a gross figure by dividing by (1 + rate) — never by subtracting the percentage.
- At 20%, the VAT inside a gross price is one-sixth of it. The general fraction is rate ÷ (1 + rate).
- Zero-rated supplies still allow input VAT recovery; exempt supplies generally do not. They are not the same thing.
- Show net, VAT and gross as three figures on every invoice — everyone's bookkeeping needs all three.
Mistakes to avoid
- Computing the VAT inside a gross price as a percentage of the gross — the subtraction error that double-counts the tax.
- Treating the full shelf price of consumer goods as revenue, forgetting the VAT fraction belongs to the authority.
- Assuming zero-rated and exempt mean the same for reclaiming input VAT.
- Running the whole price list on one blended rate when different lines carry different rates.
Questions readers ask
Do I charge VAT on everything I sell?
That depends on your registration status, what you sell and where — some supplies are zero-rated or exempt, and unregistered businesses charge no VAT at all. The categories are defined by your tax authority; confirm yours before invoicing.
Why does my customer care about the VAT figure on my invoice?
If they are registered, the VAT you charge them is usually their input credit — money they reclaim. Without the figure stated explicitly and correctly, your invoice fails at the one job their accounts department needs it for.
What is a VAT return, at heart?
An accounting of the slice system over a period: VAT charged on sales, minus VAT paid on purchases, with the difference handed over (or reclaimed, when purchases exceed sales). The chain arithmetic in this article, totalled for a quarter, is the whole idea.
Put it into numbers
Practise the two directions until they are reflexes — add VAT to a net quote, then strip it back out of the gross — and notice how the subtraction method would have lied to you.
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