Bookkeeping for a service business

Service business bookkeeping should connect fees and costs to the work performed. Identify projects, service periods and billing arrangements, including deposits, retainers and milestones. Cash receipts and invoice dates may differ from the accounting recognition of revenue under the applicable framework.

Keep time records where they support billing or project profitability, and separate reimbursable costs from included fees. Review unbilled work and amounts billed in advance with the accountant. The records should explain both the customer balance and the business's remaining delivery obligations.

Organise records by engagement and delivery

Identify each client, contract, project or service period and link it to invoices, time records and direct costs. A service business may have little stock but still needs evidence of work performed and obligations remaining. Keep the agreed scope, changes and acceptance points available. Without that context, the bookkeeper may know what was billed but not whether the relevant service has been delivered.

Distinguish retainers, fixed fees, hourly work and milestone arrangements. They can create different billing and accounting questions. The applicable FRC framework informs revenue recognition, including the relevant effective requirements for the period. ^[1] Do not assume every service invoice is earned immediately or that all unbilled staff time can automatically be recognised as income.

Track work, costs and changes consistently

Use a proportionate time or progress record where it supports billing and management decisions. Record authorised scope changes and their effect on fees. A project manager's informal promise of extra work can create costs and disputes that do not appear in the original quotation. Keep the commercial approval linked to the delivery record so finance does not invoice a variation the client never agreed.

Allocate direct subcontractor and project costs using a consistent method. Separate general overhead from costs assigned to an engagement and explain the basis. A project margin can look healthy if staff costs are omitted or moved between categories. Choose a useful management measure and reconcile it to the accounts rather than treating a single dashboard figure as the complete profitability analysis.

Review advance billing and incomplete work

Identify deposits and invoices covering future service periods. Record what remains to be supplied and discuss the appropriate accounting treatment with the accountant. For work performed but not yet billed, retain evidence of progress, contractual entitlement and the relevant estimates. Avoid using a year-end revenue adjustment simply to match an internal sales target without support from the actual engagement.

Use Customer invoices and accounting records for invoice controls and Year-end bookkeeping adjustments for period-end adjustments. Check disputed work, cancellations and credits separately. A service delivered to the team's satisfaction may still face a genuine customer dispute affecting collection or accounting judgements. Record the facts and commercial response so the accounts review does not rely on an unexplained assumption of full recovery.

Reconcile cash, client balances and obligations

Match receipts to engagements and investigate payments received before an invoice is issued. Keep overpayments and refundable deposits identifiable. Do not treat all cash entering the account as new sales. Where the company holds money in a special capacity or regulated arrangement, obtain appropriate specialist advice rather than applying an ordinary trading receipt process without assessment.

Review recurring service dates and renewal commitments. A contract may continue automatically while staff believe the project ended, or a subscription cost may support several clients. Keep supplier and customer terms aligned with the delivery model. Monitor unpaid balances and upcoming work so a company does not commit substantial staff time to a client whose earlier invoices remain unresolved without an explicit commercial decision.

For Limited company bookkeeping, provide sample engagement types, billing rules and project reports. Ask for a bookkeeping structure that supports both reliable accounts and useful management information. Agree how delivery staff provide progress and change information each month. The records should explain the connection between work, billing, costs and cash, allowing directors to assess service profitability without mistaking invoiced revenue, staff utilisation or bank receipts for the same measure.

Track a project that changes scope midway

Keep the original engagement, the agreed variation and the revised delivery plan together. Identify how the change affects fees, expected costs, invoicing and the remaining work. A project can appear profitable in the books if extra staff time is recorded without the related change in billing or forecast effort being reviewed.

Reconcile the project record with invoices, credit notes and any customer deposit. Where the customer disputes the variation, show the uncertainty rather than assuming the additional fee will be collected. Ask for accounting advice where recognition or recoverability needs judgement. This makes project reporting useful to both the delivery manager and the accountant, and helps prevent an informal commercial conversation from becoming an unsupported balance in the accounts.

Illustrative scenario

A consultancy receives a retainer for work spanning several months and hires a contractor for one project. The company tracks the service period and project costs rather than treating every receipt as immediately earned income. Management reporting can then show the margin on the work and the remaining commitment.

Preparation checklist

• Link invoices and costs to projects or service periods.
• Keep evidence for time, milestones and accepted work.
• Review deposits, advance billing and unbilled activity.
• Compare project margins with the company’s overall results.