Fixed-fee accountancy is popular because it replaces uncertainty with a predictable cost. But “fixed fee” only helps if you know exactly what it covers. This guide explains what a good arrangement should include and how to avoid surprises.

Why fixed fees appeal

A fixed fee, usually paid monthly or annually, means you know your accountancy cost in advance and can budget for it. Just as importantly, it removes the “meter running” feeling that stops some owners picking up the phone when they should. When advice is included, you are far more likely to ask for it, and that is where an accountant earns their keep.

What a fixed fee typically includes

Exactly what is bundled varies by firm and by the package you choose, but a well-defined arrangement usually spells out items such as:

  • Year-end accounts prepared and filed
  • Tax returns. For a company this often means the Corporation Tax return; for a sole trader, a Self Assessment return
  • Director’s or owner’s Self Assessment, where relevant
  • Companies House filings such as the confirmation statement, for companies
  • A defined level of support, for example unlimited email and phone queries on routine matters
  • Software such as cloud bookkeeping or a portal, where the firm provides it
  • A regular review of your position, rather than only annual contact

The key word is defined. A good engagement letter lists what is in, in plain terms, so both sides share the same expectation.

What often sits outside the fee

Surprises usually come from work that was never in scope in the first place. Common examples of things billed separately unless specifically included:

  • VAT registration or VAT return preparation
  • Payroll and pension auto-enrolment
  • Bookkeeping, if you expected to do it yourself
  • Dealing with an HMRC enquiry or investigation
  • References and reports for mortgages or finance applications
  • One-off advice on bigger decisions, such as incorporating or a large purchase
  • Catch-up work to fix a backlog of records

None of these being extra is unreasonable, but you should know up front which side of the line they fall, and roughly what they would cost if you need them.

How to avoid surprise charges

A few habits keep costs predictable:

  • Read the engagement letter carefully and ask about anything ambiguous before you sign.
  • Ask what triggers extra fees. A fair firm will tell you plainly: for example, additional companies, extra directors’ returns, or work outside the agreed scope.
  • Agree how out-of-scope work is handled. Ideally the firm quotes before doing it, so nothing lands on your bill unannounced.
  • Keep your records tidy. Many “surprise” bills are really catch-up bookkeeping. Good records keep you inside the fixed scope.
  • Review the fee periodically. As your business changes, the package should be revisited openly rather than creeping up without explanation.

Questions worth asking

  • What exactly is included for this fee, in writing?
  • What is specifically not included?
  • What would cause the fee to change, and would you quote first?
  • Is the fee reviewed annually, and how?
  • What response times can I expect for queries covered by the fee?

The bottom line

A fixed fee is only as good as the clarity behind it. The value is not the label but a clear, written scope, an honest conversation about what falls outside it, and a firm that quotes before doing extra work. Get that right and you have genuine predictability rather than a headline price with hidden extras.

How we can help

We set out clearly what your fee covers and flag anything outside it before we do it, so there are no unwelcome surprises. See our small business accountancy service, or request a quote for a transparent breakdown tailored to your business.