Payments & billing

Two uses, one category

Inside the firm, billing is where the fixed-fee model either works or quietly fails. A firm that agrees a monthly fee and then invoices it by hand, chases it by email and reconciles it in a spreadsheet has kept the worst of hourly billing and lost the point of fixed fees. A billing tool that takes the payment method at engagement, debits on the schedule and posts the receipt to the ledger removes the whole chase. Firms that move to it report the same thing: debtor days fall and the partner stops being the collections department.

For clients, the same tools become a service line. The firm sets up the client's invoicing, payment links and reminders, or runs the receivables desk outright: raising invoices from the client's job data, sending reminders on a rhythm, reconciling receipts. That is a recurring engagement with a clear boundary, and it fits naturally beside bookkeeping.

What to look for

The payment rails your country actually uses: card, direct debit, bank transfer with matching, and whatever the instant scheme is where you are. A tool built for one market's rails is expensive in another. Direct debit or its equivalent matters most for a practice, because fixed fees are recurring and a card on file expires.

Then the reconciliation. A receipt that lands in the ledger already matched to the invoice, with the processing fee split out, is the difference between a tool that saves time and one that creates a new reconciliation job. Ask to see the ledger entry, not the dashboard.

For the firm's own billing, look for the link to the proposal or engagement tool, so an accepted proposal creates the schedule and the first debit without anyone re-keying. For client work, look for the multi-client view and for reminders the client can brand as their own.

Fixed fees, schedules and the first month

A fixed-fee practice lives or dies on the schedule: when the debit runs, what happens when it fails, how a change of scope changes the amount. The tool should handle a failed payment with a retry and a message, not a silent gap the bookkeeper finds at month end. It should let the firm change a schedule mid-term without cancelling and re-creating it, because scope changes every year.

The first month is where firms lose clients to friction. Payment method captured at engagement, first debit on a date the client agreed to, receipt sent automatically. A client who has to ring the firm to pay has been given a reason to reconsider.

Pricing and how firms recover it

Vendors charge a percentage of each transaction, a flat monthly amount, or both. The percentage models scale with the money moving, which suits a firm with modest billings and punishes one with large ones; the flat models reverse that. Some price per client entity when the firm runs collections for clients. The directory records what vendors publish; it does not say what a firm should charge for a receivables service, and nothing here is fee advice. Firms describe absorbing their own processing cost inside the fixed fee and pricing client receivables work per client per month.

Running receivables as a service

The engagement works when the boundary is clear: what the firm does (raise, send, remind, reconcile), what the client does (approve the invoice run, take the difficult conversation), and by when. Firms that run it well set a weekly invoicing rhythm per client, standard reminder wording the client has signed off, and a rule for when an overdue account goes back to the client.

The failure mode is the firm becoming the client's credit controller: chasing by phone, negotiating payment plans, absorbing the client's cash anxiety. The reminder sequence and the engagement letter are the two defences.

What to avoid

Choosing on the headline percentage without modelling the firm's actual billing volume. Taking cards without direct debit for recurring fees. Any tool whose receipts arrive in the ledger unmatched. Running collections for a client before the invoicing rhythm is proven. And treating the payment tool as separate from engagement: the two should be one flow from accepted proposal to first receipt.