How gross fee income sets an accountant's minimum PI limit

Reviewed by Apex Insurance Brokers · Last reviewed 2026-08-05

If you run an accountancy practice in the UK, your professional indemnity (PI) cover is not a matter of taste. Your professional body sets a floor, and for most firms that floor is calculated from what you earn. This page explains the gross-fee-income (GFI) method the ICAEW and ACCA use, why the two differ, and where to find the figures that actually bind you.

What "gross fee income" means here

Gross fee income is broadly the total fees your firm bills for professional work in a given period, before deducting costs. Your professional body defines the exact scope in its rules — it typically covers the practice's fee income from the services it regulates, and there is usually guidance on how to treat disbursements, associates and income that passes through your accounts. The point of anchoring PI to GFI is simple: a bigger practice handles more client money and more exposure, so the safety net has to scale with the work.

The GFI-multiple approach

Rather than naming a single figure that would be too high for a sole practitioner and too low for a mid-sized firm, the bodies use a formula. The core idea has three moving parts:

• A multiple of GFI. Your minimum limit of indemnity is set as a multiple of your gross fee income — most commonly around two-and-a-half times — so cover rises automatically as the firm grows.
• A cash floor. Below a certain income, the multiple would produce a trivially small figure, so a minimum monetary limit applies regardless.
• A fixed cap on the requirement. Once GFI passes a defined threshold, the rules usually switch to a set minimum limit rather than letting the multiple run indefinitely — larger firms are then expected to assess and carry cover that is genuinely adequate for their risk.

So a very small firm is held to the cash floor, a mid-sized firm is held to the multiple, and a large firm is held to a fixed minimum plus a duty to buy what its actual exposure demands. The exact multiple, floor and threshold are published by each body and are the numbers you must verify.

ICAEW and ACCA differ — here's how to think about it

Both institutes use the GFI method, but they do not use identical numbers or identical structures. The ICAEW sets its requirements through its PII Regulations; the ACCA sets its through its own rules for members holding a practising certificate. The multiples, the income bands, the cash floors, and the required minimum uninsured excess can all differ between the two, and each body reviews its figures over time.

The practical takeaway: do not assume a colleague at a different institute faces the same minimum you do, and do not rely on a figure someone quoted a few years ago. Read the current PII rules published by your body, work out your GFI on their definition, and apply their band.

Why the minimum is a floor, not a target

Meeting your body's minimum keeps you compliant — it does not make you well insured. The GFI formula is a blunt instrument: it knows your fee income but nothing about the size of the engagements you take, the sectors you serve, or the value of the advice a client might rely on. A firm with modest fees but a handful of high-value clients can face a claim that dwarfs its regulatory minimum.

That is why the rules for larger firms typically pair a fixed minimum with a duty to hold cover that is genuinely adequate. Treat the GFI figure as the starting line. Sensible limits are usually chosen by looking at your largest exposures, your fee-per-client concentration, and the cost of defending a claim — not just the multiple. Illustrative limits such as £1m, £2m or £5m are common options, and the right one depends on your book, not a formula.

Getting your limit right in practice

A workable process looks like this:

• Calculate your gross fee income on your body's current definition, for the correct period.
• Find the band you fall into and read off the minimum limit, cash floor and any required excess.
• Stress-test that figure against your largest single engagement and your most exposed service line.
• Buy the higher of the regulatory minimum and the limit your actual risk suggests.
• Re-check every renewal — if your GFI has grown into a new band, your minimum may have moved.

If you would rather not wrestle with the bands yourself, get a PI quote through Apex and we will map your GFI to your body's requirement and to a limit that reflects your real exposure.

Common questions

Does the GFI method apply if I'm a sole practitioner?
Yes. Sole practitioners are usually held to the cash floor rather than the multiple, because a small fee income would otherwise produce an impractically low limit. Check your body's floor figure and any minimum excess rules.

My income grew this year — does my minimum change?
It can. Because the requirement is banded by GFI, growth can push you into a higher band with a larger minimum or a switch from the multiple to a fixed minimum. Recalculate at each renewal and confirm against your institute's current rules.

Which figures are authoritative — the ones on this page or my institute's?
Always your institute's. This page explains the structure of the GFI approach so you understand how it works; the binding multiples, floors, thresholds and excess levels are those currently published by the ICAEW or ACCA for your firm.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This guide is general information, not advice on a specific policy or a substitute for your policy wording.