Accountant Invoice Template: Billing for Accounting Services
Accountants have unique billing structures — retainers, hourly rates, quarterly filings, and annual tax prep. Here's how to invoice professionally for each, including professional designation requirements and engagement letter references.
What Accountants Bill For
| Service | Billing Model | Frequency | Invoice Line Example |
|---|---|---|---|
| Tax preparation | Fixed fee | Annual | Annual self-assessment, FY 2025 |
| Bookkeeping | Monthly retainer | Monthly | Bookkeeping services, January 2026 |
| Payroll | Per employee/mo | Monthly | Payroll processing, 12 employees × £X |
| Audit | Project-based | Annual | Statutory audit, year ended 31 Dec 2025 |
| Advisory | Hourly | Ad hoc | Tax planning advisory — 3.0 hrs @ £X/hr |
| VAT filing | Fixed fee | Quarterly | VAT return preparation, Q1 2026 |
| Company accounts | Fixed fee | Annual | Preparation of annual accounts, FY 2025 |
Professional Requirements on Accountant Invoices
Professional designation
CPA, CA, CTA, ACCA, ACA — include after your name on the invoice header
Member number
Some bodies (ACCA, ICAEW) require your member number on business correspondence
Regulatory body
e.g. "Registered with ACCA" or "Authorised by ICAEW for credit business"
PI insurance
PI details go on your engagement letter, not the invoice — but reference the letter
VAT registration number
Required on invoices if VAT-registered (UK: over £90K turnover threshold)
Engagement Letters and Invoices
Most accounting relationships start with an engagement letter. Your invoices should reference it:
- Reference the engagement letter date: "As per engagement letter dated 1 January 2026"
- State the billing period clearly: "For the period 1 Jan – 31 Jan 2026"
- Reference scope: "Bookkeeping — scope as agreed in engagement letter"
Fixed Fee vs Hourly: How to Show on Invoice
Fixed Fee
Simple one-line description. No need to show hours — the client agreed to the fixed price.
Description | Amount
Bookkeeping services, January 2026 | £600.00
Total | £600.00
Hourly Rate
Detailed time entries are expected — and often required by professional ethics for transparency.
Description | Hrs | Rate | Amount
R&D tax advisory | 2.5 | £150 | £375
Client meeting | 1.0 | £150 | £150
Total | £525.00
Sample Accountant Invoice
Sarah Chen, ACCA
Chartered Certified Accountant
ACCA Member No: 1234567
123 High Street, London, EC1A 1BB
VAT No: GB123456789
INVOICE
Invoice #ACC-2026-047
Date: 31 January 2026
Due: 14 February 2026
Bill to:
Acme Ltd
456 Business Park, Manchester
| Description | Amount |
|---|---|
Monthly bookkeeping services — January 2026 As per engagement letter dated 1 Jan 2026 | £600.00 |
| VAT filing, Q4 2025 | £150.00 |
| Subtotal | £750.00 |
| VAT (20%) | £150.00 |
| Total | £900.00 |
Payment terms: Net 14 days. Late payment interest at 8% per annum under the Late Payment Act.
Free Accountant Invoice Template
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Start Free Trial →Frequently Asked Questions
Do accountants need to include their professional designation on invoices?
It is strongly recommended and may be required by some professional bodies. Including CPA, CA, ACCA, or ACA after your name adds credibility and may be a regulatory requirement.
Should accountant invoices include VAT?
Yes, if VAT-registered (UK threshold: £90K turnover). Show VAT amount separately, your VAT registration number, and the VAT rate applied (usually 20% in the UK).
How should accountants invoice for retainer services?
Use a one-line description: 'Monthly bookkeeping services — [Month] [Year]' with the fixed fee. Reference your engagement letter. Invoice on the same date each month for consistency.
Can accountants charge interest on overdue invoices?
Yes. UK businesses can charge statutory interest of 8% above the Bank of England base rate under the Late Payment of Commercial Debts (Interest) Act 1998. State this on your invoice.