Legal Billing for UK Solicitors — A Practical Guide

Getting paid for legal work should be straightforward. In practice, many firms have billing processes that lose time, create disputes, and delay cash flow unnecessarily.

This post covers the practical fundamentals of legal billing — what matters, what commonly goes wrong, and how to do it better.

The billing cycle problem

Most billing problems start earlier than the invoice. They start with time recording.

If time is recorded late, or inaccurately, or not at all, the invoice will be wrong. A client who receives an invoice that does not match their expectation of the work done will dispute it — or simply delay paying it. Fixing billing problems at invoice time is too late. The fix is at time recording.

The second most common problem is billing infrequently. Many firms bill monthly or at matter close. This creates large invoices that arrive as a surprise, cash flow gaps while work is in progress, and disputed items that are hard to recall months later.

More frequent billing — on account, or at defined milestones — tends to produce fewer disputes and better cash flow.

What makes a good invoice

A good invoice should:

• Reference the matter clearly — client name, matter reference, the description of the instruction
• Itemise time spent — with enough detail that the client can understand what they are paying for
• Separate disbursements — court fees, search fees, counsel fees, and other third-party costs should be listed separately from professional charges
• State VAT clearly — amount exclusive of VAT, VAT amount, amount inclusive of VAT
• Give a clear payment deadline — and state payment methods

Clients who understand the invoice pay it. Clients who are confused or surprised delay paying it, or call to query it.

Estimates and interim billing

SRA requirements mean you must give clients the best information you can about the likely costs of a matter. This means providing an estimate at the outset and updating it if circumstances change.

Interim bills — bills on account before the matter closes — are permitted in most contexts and are good practice on longer matters. They keep cash flow healthy and ensure that costs are not a surprise at the end.

If you are billing on account, make sure your engagement letter and client care letter cover this clearly. The basis for interim billing should be agreed at the outset.

Reducing disputes

Most billing disputes are preventable. They arise from:

• Surprises — the client did not expect the amount
• Lack of detail — the client cannot see what they are paying for
• Scope creep — work was done that was not covered in the original estimate or retainer
• Late billing — the work was done so long ago that neither party can reconstruct the detail

The fixes are: consistent time recording, regular billing, clear invoices, and a process for updating the client when scope changes.

Getting paid faster

The fastest-paying clients are those who find it easy to pay. This sounds obvious, but many firms still send invoices that require a bank transfer, with the bank details buried in the footer, and then wait 30 days.

Offering a payment link — where the client can pay by card with one click — significantly reduces the payment cycle. Clients on a fixed fee or milestone structure often pay the same day the invoice arrives.

OrdoLux is legal case management software built for UK law firms, with time recording and billing built into every matter.

Where OrdoLux fits

OrdoLux handles billing directly from matter time records. Generate itemised invoices, add disbursements, and send Stripe "Pay now" links so clients can pay immediately by card. Accounts sync with Xero and QuickBooks.

See all features or book a demo.