How to create professional invoices from your phone

Last updated: September 2026

What “professional” actually means here

Customers do not judge an invoice on typography. They judge it on whether it looks like it came from a business that will still exist next year and can be argued with sensibly.

In practice that means four things: your name and details on it, a number that is clearly part of a series, the work described in terms the customer recognises, and a way to pay that does not involve retyping your sort code.

Everything else is decoration. But those four are the difference between being paid this week and being queried next month.

What a UK invoice has to carry

Keep this simple and in one place so you are not checking it each time:

• Your business name, address and contact details, and your VAT number if you are registered.
• A unique, sequential invoice number. Not a date, not a job name, and never a number you have used before.
• The date of issue, and the supply date if it is different.
• The customer name and address, as the person who owes the money, not necessarily the person who let you in.
• A clear description of the work, the amount, and VAT shown properly if you charge it.
• How and when to pay, including the terms, because “30 days” and “on receipt” are different promises.

If you are VAT registered the requirements are stricter and worth reading once on the HMRC guidance, rather than copying whatever the last invoice you received happened to do.

The numbering trap

The most common self-inflicted problem in small trades invoicing is numbering. Invoices drafted in a notes app get numbered by hand, which produces duplicates, gaps and the occasional 001 that arrives after 014.

The rule that avoids all of it: the number is allocated when the invoice is issued, not when it is drafted, and it is never reused. A draft has no number, because a draft is not yet a document anybody owes money against.

That one rule also means you can safely draft on a phone, on site, in the middle of a job, which is exactly when you remember what you actually did.

Where Dispatch fits

Dispatch runs in a phone browser, so drafting on site means opening the job and adding the lines while the work is fresh. There is a catalogue of your common charges to tap instead of typing, and VAT is applied by band.

Issuing is a separate, deliberate act, and it is what allocates the permanent number from your own INV series. The issued invoice goes out as a branded PDF with your logo on it, versioned so that a later rebrand never restamps an invoice you already sent.

The customer opens a private link, reads the invoice in their own time and can pay by card, with the money going into the business’s own account. Bank, cash and cheque payments, including part payments, are recorded against the invoice, so the outstanding balance is always the invoice own figure.

Because the invoice is raised from the job, the customer, the address and the work already agreed carry across, which removes the retyping that produces most invoice disputes.

Two habits worth more than any feature

Invoice the day the job is completed. Late invoicing is the biggest single cause of late payment in small trades businesses, and no amount of chasing gets back the three weeks you added yourself.

Describe the work as the customer experienced it. “Attended, traced fault to failed isolator, replaced and tested” is harder to query than “labour and parts”. A queried invoice is not an unpaid invoice yet, but it is on its way.

What it will not do

It is not an accounts package. There is no bank feed and no automatic reconciliation, and it does not connect to an accounting package: what it gives you is a CSV export for you or your bookkeeper.

One invoice covers one job. If you bill a customer monthly across fifteen small visits on a single document, that shape is not supported and it is better to know now.

And photographs do not attach to the invoice itself. They live on the job, in the completion report, which is where a query gets settled anyway. For what happens after the invoice goes out, see keeping track of invoices and payments.