An Introduction to VAT: What Small Businesses Need to Know

VAT, or Value Added Tax, is a topic that can feel intimidating for new business owners. Many people hear the term and worry that it involves complicated rules and extra paperwork. While VAT does add a layer of administration, the good news is that it does not apply to every business from day one.

This guide is written for beginners and explains, in plain English, what VAT is, when you need to register, and what being VAT-registered means in practice. Whether you run a small business in Farnborough or are just starting elsewhere in the UK, this guide will help you understand the basics calmly and clearly.

What Is VAT?

VAT is a tax that is added to the price of most goods and services sold by VAT-registered businesses. When a business is registered for VAT, it must charge VAT to its customers and then pay that over to HM Revenue & Customs (HMRC). In turn, the business can usually reclaim the VAT it has paid on its own business purchases.

It is important to remember that VAT is a tax on the final consumer. As a business, you are effectively acting as a tax collector for the government.

When Do You Need to Register?

This is the most important question for new businesses. You are only legally required to register for VAT when your VAT taxable turnover reaches a certain level, known as the VAT threshold.

• The current registration threshold is £90,000.

This is not based on your profit; it is based on your total sales (turnover) that are not exempt from VAT. You must register for VAT if:

1. Your total VAT taxable turnover for the last 12 months has exceeded £90,000.
2. You expect your turnover to go over £90,000 in the next 30 days alone.

Once you cross the threshold, you have 30 days to register with HMRC. It is a common mistake to miss this deadline, which can lead to penalties, so it is a date worth being aware of as your business grows.

What Does Being VAT-Registered Involve?

Once your business is registered, a few things change. In simple terms, you must:

• Charge VAT on all your relevant sales and show this on your invoices.
• Keep VAT records showing how much VAT you have charged and how much you have paid on your business purchases.
• Submit VAT Returns to HMRC, usually every three months. A VAT Return is a summary of the VAT you have charged and the VAT you have paid.
• Pay any VAT owed to HMRC. If you have paid more VAT on your purchases than you have charged on your sales, you can reclaim the difference from HMRC.

This process will now be managed through Making Tax Digital (MTD), which means you must use MTD-compatible software to keep digital records and file your VAT Returns.

What Is Voluntary VAT Registration?

Some businesses choose to register for VAT even if their turnover is below the £90,000 threshold. This is known as voluntary registration. Why would a business choose to do this?

• To reclaim: If your business buys a lot of VAT-rated goods or services but sells to other VAT-registered businesses, you may be able to reclaim significant amounts of VAT.
• To appear larger: Some businesses feel that having a VAT registration number makes them appear more established to potential clients.

However, it is important to weigh this against the administrative work involved and the fact that you will have to charge VAT to all your customers, which may make you more expensive if they are not VAT-registered themselves.

Common Mistakes to Avoid

• Not monitoring your turnover: Many businesses go over the threshold without realising it and end up registering late.
• Forgetting to charge VAT: Once you are registered, you must charge VAT on all relevant sales.
• Poor record-keeping: Not keeping clear records of the VAT you have charged and paid can make filing your VAT Return very difficult.
• Assuming all goods and services have the same VAT rate: While most are standard-rated (20%), some are reduced-rated (5%), zero-rated (0%), or exempt.

VAT Registration Date Passed but No VAT Number? What to Do Next

What you must do from your VAT registration date

You are legally required to charge VAT on your taxable supplies from your registration date, even if you have not yet received your VAT number. You cannot delay charging VAT until the number arrives.

How to raise invoices without a VAT number

You raise your invoice showing the full VAT-inclusive gross amount, with a note along the lines of:

“VAT registered from [date] — VAT number applied for and pending. Full VAT invoice to follow upon receipt of VAT number.”

This ensures that you are collecting the correct amount of money from your customer (gross including VAT) from the registration date, which you are legally required to do, without issuing an invoice that purports to be a VAT invoice when you cannot yet meet the formal requirements of one.

Once your VAT number arrives

When HMRC issues your number, you should reissue any invoices raised during the waiting period to include your full VAT number. This is important for your customers, as they cannot reclaim VAT without a valid VAT number on the invoice.

You reissue a proper VAT invoice to each customer showing:

• Their VAT registration number
• The net amount
• The VAT amount (separately)
• The gross total
• The original invoice date (or the date of supply — not the reissue date)

The customer then uses the reissued VAT invoice to reclaim their input VAT if applicable.

One important practical point

Make sure you keep a clear record linking each reissued VAT invoice back to the original interim invoice, so there is no confusion about duplication or double payment. A simple reference such as “This VAT invoice supersedes our interim invoice dated [date]” on the reissued document covers this.

Record keeping

Keep a note of all sales made from your registration date so that these can be included on your first VAT return. VAT is due from your registration date regardless of when the number is issued.

What can you back-date, when you have registered for VAT?

VAT Backdating Rules (UK)

When a business registers for VAT, it can reclaim VAT on certain purchases made before the registration date, subject to these rules:

Goods

• Up to 4 years before the registration date
• The goods must still be held by the business (in stock, as assets, etc.) at the time of registration
• They must have been purchased for business purposes

Services

• Up to 6 months before the registration date
• Services must have been used for business purposes
• They cannot be services that have been fully consumed and have no ongoing benefit

Key Conditions for Both

1. You must hold valid VAT invoices as evidence
2. The purchases must relate to your taxable business activities
3. The goods/services must not have been used to make exempt supplies
4. You must have been in business at the time of the purchase

What You Cannot Reclaim

• VAT on goods you’ve already sold or consumed before registration
• VAT on cars (unless used exclusively for business)
• VAT on business entertainment
• Anything used solely for exempt activities

Which VAT Scheme Should You Use?

Once you are registered, you also need to decide how you will account for it. HMRC offers several VAT accounting schemes, including the Standard (Accrual) Scheme, the Cash Accounting Scheme, the Flat Rate Scheme, and the Margin Scheme. Each has different rules and suits different types of businesses. For a full explanation of each scheme, see our article: Understanding VAT Schemes: Which One Is Right for Your Business?

When Getting Advice Can Help

VAT can be a complex area, and you are not expected to be an expert overnight. Getting advice can be particularly helpful if you are approaching the VAT threshold, you are considering voluntary registration, or you sell to customers outside the UK.

If you would like calm, practical support as your business develops, Penney’s Accountancy works with UK small businesses in Farnborough and the surrounding areas, helping owners understand their responsibilities and make confident decisions.

Want to Learn More in Your Own Time?

For those who want to build their confidence and understand these topics in more detail, Penney’s Finance School offers an online, self-paced business and finance course. It covers everything from company setup to cash flow and tax, allowing you to learn at your own pace.

Important information

The information provided in this article is intended as general guidance for UK businesses only and reflects UK tax legislation and HMRC guidance as of February 2026.

Tax rules and business requirements can change, and individual circumstances vary. Before acting on any of the information above, we recommend speaking to a qualified accountant who can provide advice tailored to your specific situation.