What to include on an invoice so clients pay you faster

An invoice that gets paid quickly has six things on it: your details and the client's, a unique number, an issue date and a real due date, a description that matches the contract, the amount with any tax shown separately, and a way to pay. Leave one out and the invoice goes to the bottom of someone's pile, where a 30-day term quietly becomes 60.

Start with the fields every invoice needs

Every invoice needs identity, a number, dates, a description and a total. The UK government lists the basics for all invoices: a unique identification number, your company name, address and contact details, the customer's name and address, a clear description of what is being charged, the supply date and invoice date, the amounts charged, the VAT amount if applicable, and the total owed. Those apply whether or not you are VAT registered.

Here is how that looks in practice.

Your business name, address and contact details, and the client's. If you trade under a name or hold a tax registration number, put it on. The client's accounts team needs it to file the payment, and a missing detail is a common reason for a query instead of a transfer.

A unique invoice number. Sequential is the easiest way to be unique, and it lets both sides refer to the invoice later. Most accounting software rejects an invoice without one.

The issue date and a specific due date. Write the date, not just "net 30." "Due 14 June 2026" is harder to ignore than a term, and nobody has to count days.

A clear description of the work. "Design services" invites questions. "Brand identity: final logo files and a one-page style guide, as agreed in the 2 May contract" doesn't. The description should match the contract so nothing needs reconciling.

The amount, any tax, and the total. Show the math. If you collected a deposit, show it as a credit so the balance due is obvious.

How to pay. This is the line people forget most. Say what methods you accept and give the client something to click.

Add the tax lines your country expects

If you charge VAT or a similar tax, the invoice has extra requirements, and they differ by country. The summaries below are a starting point. Check them with your accountant, because thresholds and exceptions change.

In the UK, the government says VAT invoices must include your VAT number and show the VAT separately from the price.

In the UAE, Cabinet Decision 52 of 2017 sets out what a tax invoice contains. The text of the decision (an unofficial English translation on the FTA site) lists the words "Tax Invoice," the supplier's name, address and Tax Registration Number, a sequential or unique invoice number, the issue date, a description, and amounts in AED. It also allows a simplified tax invoice with fewer fields in some cases. The UAE is also phasing in e-invoicing, so if you invoice UAE clients, our UAE guide is worth a read.

In the EU, rules sit in national law and vary. The common thread is the same: your tax number, the tax rate and amount, and a number that places the invoice in a sequence.

If you sell across borders or use currencies other than your own, add the currency and, where the law requires it, the exchange rate. Check your accountant on which rate to use.

None of this changes the main point. A tax number on the invoice tells the client you are a real business, and it saves their bookkeeper an email.

Payment terms that get you paid sooner

Net 30 is a habit, not a law. Between businesses in the EU, the Late Payment Directive sets a 30-day payment period, allows up to 60 days between businesses when agreed, and gives a creditor a fixed 40 euro compensation for late payment. In the UK, statutory interest on late business payments is 8% plus the Bank of England base rate, unless your contract sets a different rate. Those rules are useful to know, but they are a backstop. Most of the speed comes from what you put on the invoice and in the contract.

A few choices move money faster:

Shorten the term. Net 14, or net 7 for smaller jobs, is common and rarely questioned. You find out whether a client objects only by stating a term.

Take a deposit before you start. A deposit before the project covers your early work and filters out clients who were never going to pay. A common split is half to start and half on delivery.

Break big jobs into stages. A payment schedule with a due date per stage means no single invoice is large enough to scare anyone. Pick the split that matches how the work is delivered.

Put late-payment terms in the contract, not just on the invoice. If you want to charge interest, say the rate in the agreement you both signed. An invoice that introduces a surprise late fee invites an argument.

Make the invoice payable in place

The biggest upgrade is to let the client pay from the invoice. An invoice that only states what is owed asks the client to go and do something elsewhere: dig out bank details, open a banking app, type a reference. That step waits for a quiet moment, and the week doesn't have one.

A "Pay now" button next to the invoice removes the gap between deciding to pay and paying. It works best when it runs through your own gateway, so the money goes straight to your account and no platform sits in the middle holding it.

Follow up without it feeling awkward

Chasing feels rude, so many people do it too late. It isn't rude. It's admin, and a steady rhythm keeps it calm.

Send a short reminder a few days before the due date. "Quick heads-up, invoice 0042 is due Friday, and the payment link is here." Pre-due reminders sound helpful, not pushy.

If it passes the due date, write a one-line note the next day. "Invoice 0042 was due yesterday. Here's the link again in case it slipped through."

Then follow up at fixed intervals so you never have to decide how you feel about it. Reminders at 7, 14 and 30 days after the due date work well, and they stop the moment the invoice is paid. If the client still hasn't paid, five email scripts for late payers cover the harder messages.

How Delivvo gets invoices paid

Delivvo puts the invoice, the contract and the payment link in one place, so the client has nothing to look up and nothing to guess.

The flow looks like this:

1. You build the quote from packages and add-ons. On the Pro plan, the client can pick, sign and pay the deposit on one page, and the client, project, contract and invoice are created from that record.
2. The invoice takes the next number in your own format. Invoices carry a Tax Invoice title where that applies, and you can void one or issue a credit note if something changes.
3. For bigger jobs, a payment schedule splits the total into up to 12 payments, each with its own due date.
4. The client opens one link in the portal and sees the work, the contract and the invoice together. They pay through your own Stripe, PayPal or Square account.
5. Late payment reminders go out at 7, 14 and 30 days and stop once the invoice is paid, so you don't write the awkward email yourself.

Two details a competitor page won't have. Delivvo takes 0% of the payment, and the money goes from your client to your gateway without passing through a Delivvo account. And every invoice carries a verification code: anyone who has the document can check it on the verify page and see the issuer, number, dates, amount and status.

Invoices are records you issue, not tax advice, and tax rules vary, so check the details with your accountant. For how the tax fields work in the product, see invoices and tax.

For the wider picture, see how payments work and the CRM for service businesses.

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