Zeller Invoices

Online invoices that get you paid faster

Over 75% of Zeller Invoices are paid in under 24 hours

Fast payments, mean better cash flow. With Zeller, customers can pay by card (American Express, Visa, or Mastercard) in seconds via a secure payment link: no bank transfer required. Funds settle nightly into your Zeller Transaction Account, so you can use that money sooner, whether it's paying suppliers or reinvesting in the business.

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Professional, branded invoices, in a click

Select from three stylish themes then add your business logo, brand colours, payment terms, and a personalised message.

Cut your admin time and accelerate your cash flow

Free to send

Create and send unlimited invoices with no monthly fees, no matter how many clients you're billing. You'll only pay a low 1.5% fee when your invoice gets paid by card.

Invoice on mobile

Create, send, and manage invoices on the go with the Zeller App, from your smartphone. Send via SMS, email, or both with a secure payment link included.

Customisable templates

Align your invoices to your brand by choosing a template, adding a colour theme, custom message, and business logo. Your preferences will be saved for every future invoice.

Automated reminders

Prompt clients to settle up with automated reminders sent via email, SMS, or both. Set it once, and let Zeller chase up outstanding payments for you.

Track in real time and by contact

See what's been sent, paid, followed up, or left overdue at a glance, then track invoices by contact to spot your most frequent customers, and how much they've earned you.

Scheduled and recurring invoices

Set automatically recurring invoices for regular clients, or schedule one-off invoices to go out later, so you can manage admin on your own time, not just when the job's done.

1.5%

Online invoicing with no monthly subscription fees

One low rate for domestic Mastercard and Visa cards

Security, built in.

Keeping your business and customer data safe is built into every Zeller Invoice. All accounts are protected with multiple layers of encryption and two-factor authentication, backed by 24/7 fraud monitoring. Plus, Zeller is PCI-DSS Level 1 certified and regulated by the FCA, so your invoicing data is held to the same rigorous standard as your payments.

VAT management made easy

Adding VAT to your invoices is simple with Zeller. Enter your VAT number and rate once, and it’s automatically applied to every invoice you send, no manual calculations required. Plus, create a free Zeller Business Account to set aside VAT as you get paid, keeping it separate from your everyday funds and ready when it’s time to pay.

Join over 110,000 business owners getting paid faster

Between wholesale orders and private catering bookings, our invoices are never simple. Zeller lets us itemise everything clearly and set automatic reminders, so we're not chasing payments on top of running the café.

Lubna Alam
Pudding London

In my line of work, I'm rarely behind a desk. Being able to send a professional invoice from my phone the moment a session wraps means I get paid quickly, without adding admin to my evening.

Jacqueline Weber
The Wardrobe Girl

London, UK

Invoice from anywhere with Zeller

Download the Zeller App for free and start sending professional online invoices today.

Frequently asked questions

An online invoice is a digital bill created and sent electronically, rather than printed or handwritten. With Zeller Invoices, you can create a professional invoice in your browser or app, then send it straight to your customer by email or SMS, with a secure payment link included.

With Zeller Invoices, simply add your business and customer details, itemise what you're charging for, then send the invoice directly via email or SMS. Your customer receives a secure payment link so they can pay by card instantly, without needing to bank transfer.

No. UK invoices don't legally require a signature — HMRC accepts unsigned electronic invoices as valid, as long as they include the required details like your VAT number (if registered), invoice date, and payment terms.No. UK invoices don't legally require a signature — HMRC accepts unsigned electronic invoices as valid, and they carry the same legal weight as a signed paper invoice, as long as they include the required details like your VAT number (if registered), invoice date, and payment terms.

An invoice number is a unique reference assigned to each invoice, used to track payments and keep accurate records. It should be sequential and never repeated — for example, INV-0001, INV-0002. Zeller Invoices generates and assigns this automatically for every invoice you create.

Payments made via Zeller Invoices settle nightly into your Zeller Transaction Account, so funds are typically available the next business day rather than the several days it can take with a bank transfer.

Only VAT-registered businesses need to add VAT to their invoices. You're legally required to register for VAT once your taxable turnover exceeds £90,000 in any 12-month period, though you can register voluntarily below this threshold if it benefits your business. If you're VAT-registered, your VAT number and the VAT charged must appear on every invoice — with Zeller Invoices, you can enter your VAT rate once and have it applied automatically going forward.

The best online invoicing software for UK businesses is one that combines speed, flexibility, and cost-efficiency — letting you create professional invoices quickly, accept payments without friction, and manage admin without paying for features you don't need. For most small businesses, freelancers, and sole traders, that means free invoice creation, fast card payments, built-in VAT support, and automation like reminders and recurring billing, all in one place.

What to look for in invoicing software

Not all invoicing tools are built for the same kind of business. A one-off invoice generator might suit someone sending a single bill, but most UK businesses need something that scales with them — supporting multiple clients, recurring work, and growing transaction volumes. Look for software that offers customisable, branded templates, real-time payment tracking, and the ability to accept card payments directly, rather than relying on manual bank transfers. VAT handling is also essential for any VAT-registered business, as is the ability to access funds quickly once an invoice is paid.

Free vs. paid invoicing tools

Many invoicing platforms charge a monthly subscription regardless of how many invoices you send, which can be costly for businesses with irregular or seasonal billing. Others are free to use but charge a percentage fee only when an invoice is actually paid — a model that scales more naturally with your business, since you're never paying for a quiet month. When comparing options, it's worth checking not just the headline price, but also transaction fees, settlement speed, and whether core features like automated reminders or recurring invoices sit behind a paywall.

Why UK businesses choose Zeller Invoices

Zeller Invoices is built specifically for small businesses, tradespeople, freelancers, and sole traders who want professional invoicing without unnecessary cost or complexity. There are no monthly fees — you only pay a low 1.5% fee when an invoice is paid — and every invoice can be sent by email or SMS with a secure payment link built in, so customers can pay by card in seconds. Features like VAT handling, automated reminders, recurring and scheduled invoices, and real-time payment tracking are included as standard, not locked behind a premium tier. And because Zeller is a regulated financial services provider, your invoicing data is protected to the same standard as your payments.

Getting started with Zeller Invoices

Whether you're sending your first invoice or replacing a slower, manual process, Zeller Invoices is free to set up and takes minutes to get started. Create your first branded invoice, connect your payment details, and start getting paid faster — with no monthly commitment and no hidden costs.