Invoicing for UK businesses: a complete guide

In this article

Invoicing is how you ask to be paid, and how you record that you have been. Your invoice has to carry specific information by law, and more of it if you're VAT registered. But raising the invoice is only the first of five stages, and the four that follow are where you win or lose the money.

Most invoicing guides stop at "send it". This one doesn't, because sending an invoice and getting paid aren't the same thing.

The short version

• Every UK invoice needs a unique identification number, your details, the customer's details, a description, the supply date, the invoice date and the total owed. Sole traders and limited companies each have extra requirements.
• If you name one director on your invoices, you must name all of them.
• VAT registered businesses need a fuller VAT invoice, normally issued within 30 days of supply.
• Payment method changes how fast you are paid: 72.7% of Apple Pay payments arrive on or before the due date, against 57.9% for bank transfer.
• Invoices set to collect automatically are paid 98.0% of the time. Collected on demand, 90.8%.
• You have an automatic right to charge interest on late business invoices. Only 5.9% of businesses use it.

The five stages of invoicing

Most businesses invest heavily in raising invoices, occasionally in chasing them, and very rarely in the processes behind sending, making payable and reconciling. That distribution is why late payment persists even in businesses with a seemingly tidy process.

Stage 1: raising a valid invoice

There are three layers to get through: what every invoice needs, what your business structure adds, and what VAT registration adds on top.

Every UK invoice you issue has to include:

• A unique identification number
• Your company name, your address and your contact information
• The company name and address of the customer you are invoicing
• A clear description of what you are charging for
• The date the goods or service were provided, known as the supply date
• The date of the invoice
• The amount or amounts being charged
• The VAT amount, if applicable
• The total amount owed

Note that the supply date is required on every invoice, not only VAT ones, and it's a separate field from the invoice date. The two get conflated all the time.

Then there's what your business structure adds:

One detail catches companies out. If you choose to put any director's name on your invoices, you must include the names of all your directors. There's no obligation to name directors at all, but naming one commits you to naming every one.

And if you and your customer are both VAT registered, you need a full VAT invoice. Government guidance confirms that VAT invoices must show your VAT number and display the VAT separately.

A full VAT invoice needs more information than the list above. It also has to show the time of supply, the date of issue, your VAT registration number, a unit price, and for each line the quantity, the VAT rate and the amount payable excluding VAT. Then the gross total excluding VAT, the rate of any cash discount, and the total VAT in sterling. Where a margin scheme, a reverse charge or a free zone applies, your invoice has to say so.

You've got 30 days to issue it. A VAT invoice must be provided within 30 days of the time the supply is treated as taking place, unless HMRC has allowed longer by direction. Those 30 days run from the tax point, not from the day you get round to raising it.

Simplified invoices are a retail provision. A retailer can issue a less detailed invoice where the supply including VAT is £250 or less and nothing on it is exempt. It still needs the retailer's name and address, the VAT number, the time of supply, a description of what was supplied, the VAT rate, and the gross amount payable at each rate. If you're not retailing, every VAT invoice you issue is a full one, whatever the amount. It's tempting to work from the £250 figure on its own, because it gets repeated without the condition attached to it.

The tax point is the field people most often get wrong. It decides which VAT period a sale falls into, and it isn't automatically your invoice date. Issue a VAT invoice within 14 days of the basic tax point and the invoice date becomes the tax point. Miss that window, or opt out of the rule, and the basic tax point stands. Two things follow from that. A late invoice can push VAT into the wrong quarter. And a tax point created this way covers the whole value of the supply, not only the amount you happened to invoice.

On numbering, what the law asks for is a unique identification number, and the practical standard is one consistent sequence. It's tempting to restart your numbers per client or per year, but that creates duplicates across your ledger. That matters for HMRC, and it matters again at stage 5, because inconsistent numbering is one of the main reasons payments can't be matched to invoices automatically.

Stage 2: getting the invoice seen

An invoice nobody opens is an unpaid invoice, and email is where invoices go to be buried rather than refused. Almost no invoicing guide covers this stage, because it falls between your accounting software's job and your collection provider's job.

Set your payment terms first, because everything else at this stage follows from them:

Whatever you choose, put it on the invoice in words instead of leaving "30 days" to be worked out from a due date.

Then there's the delivery itself, and the fixes here are unglamorous:

• Send it to a person, not a role. There will always be a queue for an accounts@ inbox, and a named person is accountable and more likely to pay you.
• Match the channel to the client. Larger finance teams work through email, and sole traders and small firms will often respond faster to a message on their phone.
• Put the amount and the due date in the subject line, so it's less likely to be skimmed past.
• Give them a way to pay in the same place as the invoice. You can't interact with a document, but you can interact with a link.
• Confirm who approves it. On your larger invoices the person receiving it often can't authorise it, and finding that out at day 30 can cost you a month.

Across Adfin, the median customer-initiated payment arrives 53 hours after the request, and 42.9% arrive inside 24 hours (Adfin platform data). Nearly all the movement is in the first day or two after somebody actually sees what you've sent, and an invoice that gets past that window can wait weeks. So a week spent getting in front of the right person is a week added to the end of your cycle.

Stage 3: making it easy to pay

The gap between effort and return is at its widest here. Every step between seeing your invoice and paying it loses people.

The payment methods you offer change how promptly you get paid:

The pattern is consistent: the fewer steps a method takes, the sooner your invoice is settled. Apple Pay and Google Pay just need a face or a fingerprint. A bank transfer needs your customer to log in, set up a payee and type a reference, and it's the slowest of the lot.

Direct debit sits outside this table deliberately, because your customer doesn't choose it each time. Once a mandate exists, collection happens on the due date without anyone deciding anything, which is why it behaves differently and why it's the natural choice for recurring work.

Stage 4: chasing what has not been paid

Chasing is the stage most businesses accept as unavoidable. Research for the Department for Business and Trade and the Small Business Commissioner (2025) found that businesses affected by late payment spend an average of 86 hours a year chasing it, and that late payment costs the UK economy almost £11 billion a year.

The more useful finding is that whether you chase at all matters less than whether the payment was set to collect automatically, using direct debit or a card on file. Comparing invoices set to collect automatically against those collected on demand:

Worth being straight about what this does and doesn't show. Invoices set to collect automatically usually have a direct debit mandate behind them, so automation on its own isn't doing all the work here. Agreeing how you'll be paid before the work starts will do more for you than chasing the payment afterwards, and automation makes that chasing bearable while a mandate makes most of it unnecessary.

You've also got a legal position most businesses never use. On a business-to-business invoice you can charge statutory interest at 8% plus the Bank of England base rate, and separately claim debt recovery costs as a fixed sum per invoice.

One caveat worth knowing: you cannot claim statutory interest if your contract sets a different rate of interest, so check your own terms before relying on it.

The same government research found only 5.9% of businesses had introduced or increased a penalty on overdue invoices. The barrier isn't the law, it's the admin of calculating the interest and applying it. If you do add interest, the government guidance is to issue a new invoice for it.

Stage 5: reconciling the money

Once your invoice is paid, you're not finished until your books are in order.

Reconciliation can break in predictable ways:

• The reference is missing or wrong, so the payment can't be matched to the invoice
• The amount doesn't match, because of an underpayment, an overpayment or a partial payment
• Payouts arrive net of fees, so the money in your account never equals the invoice total
• Several invoices get paid in one lump, and someone has to split it by hand
• Refunds and credit notes can mess up an otherwise clean match

Net payouts quietly cost you the most time here. If a provider deducts its fees before paying you, every payout has to be unpicked into invoice value and fee, usually through a clearing account, and the VAT on the fee needs handling separately. Being paid gross, with the fee invoiced to you separately, removes that work entirely.

Common invoicing failures

The recurring failures, in rough order of how much they can cost you:

1. Payment terms agreed but never enforced. Terms with no collection mechanism behind them are a statement of hope.
2. Only one payment method offered, and it's usually bank transfer, the slowest one.
3. Chasing that depends on someone remembering. It works until your week gets busy.
4. Invoice numbering you can't reconcile against, normally because the sequence restarts for every client.
5. Large invoices left on manual collection. Mandate coverage falls away as invoices get bigger: 74.1% of paid invoices under £100 had a direct debit mandate behind them, against 37.4% at £2,500 and over (Adfin platform data). So the invoices carrying most of your cash are usually the ones nobody arranged to collect.
6. No statutory interest, ever. The right exists automatically, and almost nobody uses it.

Invoicing in an accountancy practice

Practices have the same five stages and one extra complication. Your invoice is a fee note to a client you also advise, so the relationship makes chasing awkward in a way it never is for a supplier.

Practices that solve this move the payment decision to the start. If you capture a direct debit mandate at the point the client signs the engagement letter, fee notes collect themselves and the awkward conversation never has to happen. At Cloud Accounting Support Services, 89% of clients signed their new mandate within three days of being asked.

Lock-up is the number that matters here. You can invoice perfectly and still have money sitting in work in progress and debtors for months, and that's a stage 3 and stage 4 problem more than a stage 1 one.

How Adfin handles the five stages

Adfin exists because those five stages are usually five separate tools.

• Raise: create invoices in your branding, or bring them in from Xero and QuickBooks with a two-way sync. Invoices can also be built from a PDF, a spreadsheet or a photo instead of being retyped.
• Send: deliver by email, WhatsApp or SMS from your own domain and branding.
• Make payable: one link offering direct debit, card, Apple Pay, Google Pay, open banking and bank transfer, at 1% + 20p per successful payment, capped at £4 on direct debit and bank payments.
• Chase: customer agents follow up on the channel and timing each client responds to, and can apply statutory late fees automatically. Core credit control is included at no cost, and enhanced agentic credit control is available for those who require it (at an extra 0.3%).
• Reconcile: payments match back to the invoice automatically, including underpayments, overpayments and missing references, and payouts are made daily and gross with the fee invoiced separately each month.

You can see the whole cycle in one place. Book a demo or see Adfin pricing.

Common questions

What must a UK invoice legally include? A unique identification number, your company name, address and contact information, the customer's company name and address, a clear description of what you are charging for, the supply date, the invoice date, the amounts charged, the VAT amount if applicable, and the total owed. Sole traders must also give their own name and a service address. Limited companies must use the full name on the certificate of incorporation.

Do I have to name my directors on an invoice? No, but if you name one you must name all of them. There is no requirement to include directors at all.

How soon do I have to issue an invoice? Within 30 days of the tax point, which is normally the date of supply, or the date of payment if you were paid in advance. HMRC can allow longer by direction.

Can I use a simplified invoice? Only if you are a retailer. A retailer can issue a less detailed invoice where the supply including VAT is £250 or less and nothing on it is exempt, showing the VAT rate and the gross amount payable at each rate. Every other business needs a full VAT invoice, whatever the amount.

Does invoice numbering have to be sequential? Yes, and it should follow one consistent scheme rather than restarting per client or per year. Broken numbering is also one of the main reasons payments cannot be matched automatically.

What is the fastest way to get an invoice paid? Give the payer the fewest possible steps. Wallet and card payments are settled on or before the due date most often, and bank transfer least often. For recurring work, a direct debit mandate removes the decision altogether.

Sources

• legislation.gov.uk — VAT Regulations 1995, regulation 14 (accurate as of August 2026)
• GOV.UK — invoicing and taking payment from customers (accurate as of August 2026)
• GOV.UK — charging interest on a commercial debt (accurate as of August 2026)
• GOV.UK — claiming debt recovery costs (accurate as of August 2026)
• HMRC — VAT Trader Records manual, VATREC6010 (accurate as of August 2026)
• HMRC — VAT Trader Records manual, VATREC16042 (accurate as of August 2026)
• HMRC — VAT Time of Supply manual, VATTOS5235 (accurate as of August 2026)
• Small Business Commissioner — late payment research (accurate as of August 2026)

This article explains how invoicing works and is not tax or legal advice. VAT requirements are correct as of August 2026; check current HMRC guidance before relying on them. Last updated August 2026.