VAT for small businesses: a practical guide

1. Do you need to register?

You must register once your taxable turnover crosses the threshold in your country — measured over a rolling 12 months, not a calendar year. Thresholds differ enormously: from none at all in some places to €85,000+ for goods elsewhere. Registration can also be voluntary below the threshold, which is worth considering if you sell zero-rated goods or have heavy input VAT to reclaim.

2. How VAT works in practice

Once registered, you charge VAT on your sales and reclaim VAT on your business purchases. The difference is what you pay the authority — or, in a bad quarter, what it repays you. Registering is therefore not just a tax cost: it also opens up input reclaim, which is why a business with big purchases can end up better off.

Watch the cash-flow detail: the VAT you collect is not your money. If you invoice £1,200 for a £1,000 job, the £200 belongs to HMRC from the moment it lands. Businesses that treat the VAT account as spending money are the ones that get hurt in a slow month.

3. Your to-do list once registered

1. Charge the right rate on every sale — standard, reduced or zero depending on the item and country.
2. Issue compliant invoices: your VAT number, the customer's number for business sales, net amount, rate and VAT shown separately.
3. File on time, even at zero: a nil return is still a return, and late filing penalties stack up quietly.
4. Keep records — typically six years or more — for sales, purchases and exports.
5. Know when the reverse charge applies (see our guide) so you neither charge VAT you shouldn't nor miss VAT you should account for.

4. Schemes that simplify life

Many countries offer simplified schemes for small businesses: the UK flat rate scheme, cash accounting (pay VAT when customers pay you), annual accounting, and the Netherlands' KOR small business scheme. Each trades paperwork for some other cost — the flat rate, for example, gives up most input reclaim — so the right answer depends on your margins. Run both scenarios with real numbers before switching.

5. Five mistakes to avoid

• Forgetting to charge VAT on a new customer — fixing it later means correcting the invoice and often absorbing the VAT yourself.
• Assuming the reverse charge never applies to you — if you buy or sell services cross-border, it probably does.
• Using one rate for a mixed basket — split by rate; the receipt will often show the groups.
• Losing purchase invoices — each missing receipt is money you can't reclaim.
• Treating the threshold as a calendar-year test — it is usually a rolling 12 months, so a strong quarter can trigger registration sooner than you expect.

6. A tiny worked example

You invoice a customer €1,000 net at 20% VAT: the invoice total is €1,200. During the quarter you bought €300 of supplies (€360 gross), so you reclaim €60 of input VAT. Your return shows output VAT €200 minus input €60 = €140 due to the authority. The calculator does each of those steps in seconds.

Common questions

Last reviewed: 16 October 2026 · This guide explains general principles, not your specific tax position. Methodology · Editorial standards · Report an error