Terminology · PI & E&O
Professional indemnity vs errors and omissions — the UK/US terminology map
Reviewed by Apex Insurance Brokers · Published 14 July 2026
Short answer. Errors and omissions insurance is the North American term for what the UK market calls professional indemnity insurance. The cover concept is the same: liability for financial loss caused by negligent professional work. Where a UK contract specifies E&O, check the limit and basis required, then place UK professional indemnity that meets or exceeds it and your regulator’s published minimum.
‘Errors and omissions’ (E&O) is US terminology for what UK insurers call professional indemnity (PI). The distinction is more than semantic — US-derived contracts using E&O language sometimes contain assumptions that don't fit UK PI wordings. This page maps the terminology and the practical differences.
The core terminology map
- UK: Professional indemnity insurance (PI or PII). Cover for civil liability arising from professional advisory services.
- US: Errors and omissions insurance (E&O). Same broad concept but with distinct wording conventions and market practices.
- Same underlying idea: insurer indemnifies the professional for civil liability to third parties arising from professional services.
Where the wording differs
- Defense-cost treatment. US E&O policies traditionally structured with defense inside the limit; UK PI has moved similarly but with some legacy differences.
- Duty to defend. US E&O often gives the insurer a formal duty to defend; UK PI typically gives the insurer the right to defend rather than an absolute duty.
- Claims-made trigger. Both use claims-made trigger but retro-date provisions and notification triggers differ.
- Aggregate structures. US market typically defaults to aggregate; UK market varies by profession (SRA MTC is each-and-every).
- Exclusion language. Different conventions on what's explicit vs implicit.
When UK firms encounter E&O terminology
- US client contracts. US companies engaging UK professional services often use E&O language in the insurance clause.
- Multinational corporate procurement. Global templates using US terminology.
- Reinsurance contexts. Global reinsurance markets use E&O terminology.
- US-connected clients. UK-resident-but-US-connected clients may draft requirements in US language.
How UK PI responds to E&O-worded client requirements
- Substantively yes. UK PI cover meets US E&O requirements in terms of underlying protection.
- Wording differences matter for specific clauses. Duty to defend, claims-made retro-date, aggregation position — ensure the UK policy addresses what the US contract needs.
- Certificate of insurance can typically evidence UK PI cover meeting US E&O requirements.
- Some US contracts require specific insurer types or ratings — Lloyd's or S&P-rated company market typically acceptable.
Published minimum PI requirements by UK regulator or professional body
UK regulators write their requirements in terms of professional indemnity, not errors and omissions, as the published minimums below show.
| Regulator / body | Minimum limit of indemnity | Basis | Run-off required | Excess cap |
|---|---|---|---|---|
| SRA (solicitors) | £3m for a relevant recognised body or relevant licensed body; £2m in all other cases | Any one claim; no monetary limit on defence costs | Six years after cessation | Not fixed in the Minimum Terms |
| ICAEW (chartered accountants) | £2m; or 2.5 × gross fee income (minimum £250,000) where gross fee income is under £800,000 | Any single claim and in the aggregate | At least two years, then all reasonable steps for a further four | Aggregate excess capped at the higher of £3,000 or 3% of gross fee income |
| ACCA | Total income under £600,000: greater of 2.5 × relevant total income or £100,000. Total income £600,000 or more: at least £1.5m | Per ACCA Global Practising Regulations | Not published as a fixed period in this source | Uninsured excess restricted to £20,000 per principal |
| AAT (licensed members) | Sole traders: greater of 2.5 × gross fee income or £50,000. Partnerships and limited companies: greater of 2.5 × gross fee income or £100,000. Maximum required cover £1m where gross fee income exceeds £400,000 | Full civil liability, fully retroactive | Not published as a fixed period in this source | Set at a level the member can meet at all times |
| RICS (chartered surveyors) | Turnover £100,000 or less: £250,000. £100,001–£200,000: £500,000. £200,001 and above: £1m | Each and every claim (or aggregate plus unlimited round-the-clock reinstatement); defence costs in addition to the limit | Six years; consumer run-off £1m in all for six years | Greater of 2.5% of the sum insured or £10,000, for limits up to £10m |
| ARB (architects) | £250,000 | Each and every claim, except fire safety, cladding, asbestos and pollution which may be aggregate | Six years, or five years in Scotland, at the same level as the last year before cessation | Not published |
| FCA — insurance intermediaries (MIPRU 3.2) | €1,300,380 for a single claim; in aggregate the higher of €1,924,560 or 10% of annual income, capped at £30m | Per year | Not set in MIPRU 3.2 | Higher of £2,500 or 1.5% of annual income (no client money); higher of £5,000 or 3% (client money held) |
| FCA — IDD insurance intermediaries (IPRU-INV 13.1) | Relevant income up to £3m: at least £500,000 single claim and aggregate. Relevant income over £3m: at least £650,000 single claim | Per policy | Not set in IPRU-INV 13.1 | Excess over £5,000 requires additional capital resources |
Sources: SRA Minimum Terms and Conditions (sra.org.uk); ICAEW PII Regulations effective 1 September 2024, regs 3.2, 3.3, 3.7 (icaew.com); ACCA Professional Indemnity Insurance Regulations (accaglobal.com); AAT professional indemnity insurance requirements (aat.org.uk); RICS Professional indemnity insurance requirements, UK and Republic of Ireland, 2 July 2025 (rics.org); ARB PII Guidance (arb.org.uk); FCA MIPRU 3.2 (handbook.fca.org.uk) and IPRU-INV 13.1 (handbook.fca.org.uk). Figures are the published minimums at the date shown on each source and are not advice; check your own body’s current rules.
Common pitfalls in translation
- Assuming US and UK cover are identical. They're similar but not identical. Wording review matters.
- Certificate mismatches. US requirement specifies A.M. Best rating that UK insurers don't hold; discuss alternatives.
- Territorial scope. US E&O typically covers US work; UK PI may need territorial extension for US-connected activity.
- Aggregate vs each-and-every mismatch. US expectation is aggregate; UK client requirements may specify each-and-every.
- Duty-to-defend interpretation. UK PI right-to-defend may be represented as duty-to-defend to US clients — discuss with broker.
Getting cover structured for US-adjacent work
- Discuss with broker whether UK PI or additional territorial cover is needed.
- Confirm the policy addresses US-specific requirements (rating, structure, territorial scope).
- Certificate of insurance drafted for US client acceptance.
- Cross-border extensions for firms with US clients or US-based work.
- Some firms with material US exposure need US-market E&O in addition to UK PI.
Frequently asked
Is E&O the same as PI insurance?
Same underlying concept — cover for civil liability arising from professional services. E&O is US terminology; PI is UK. Wording conventions differ; substantive cover is broadly equivalent.
Does UK PI insurance meet US E&O contract requirements?
Substantively yes. Some specific clauses (duty to defend, aggregate structure, insurer rating) may need discussion. Certificate of insurance typically bridges the terminology.
What is the difference between claims-made and occurrence coverage?
Claims-made responds to claims made during the policy period; occurrence responds to acts done during the policy period regardless of when the claim is made. UK PI and US E&O are both typically claims-made. Occurrence is rare in professional liability.
Does UK PI cover work I do for US clients?
Depends on territorial scope. UK PI typically covers UK work; territorial extensions cover other jurisdictions. Material US work may need US-market E&O in addition. Discuss with specialist broker.
What is A.M. Best and why does US contract specify it?
A.M. Best is a US insurance-rating agency. US contracts often require insurers with specific A.M. Best ratings. UK insurers don't universally carry Best ratings; alternatives include Lloyd's rating, S&P, Moody's ratings which are usually acceptable.
What is the difference between duty to defend and right to defend?
US E&O typically gives the insurer a formal duty to defend the insured; UK PI more typically gives the insurer the right to defend without absolute obligation. In practice both mean the insurer manages the defence subject to policy terms.
Do I need US-market E&O if I work with US clients occasionally?
Occasional US-connected work typically covered by UK PI with territorial extension. Material US-client work or US-based operations may warrant US-market cover. Threshold varies by firm profile.
Are aggregation clauses different in E&O vs PI?
Similar concepts, different conventions. US E&O typically aggregates; UK PI varies by wording. Where the client requires specific structure, confirm the UK policy delivers it. SRA MTC is each-and-every for the mandatory layer.