How is business interruption insurance cost calculated in the UK?

UK underwriters multiply a base rate by headcount, turnover band, trade risk loading, and claims history. This calculator exposes each multiplier and cites the broker-survey data behind it.

Is this calculator a real quote?

No. It produces an indicative range based on Q1 2026 broker-submission data. To bind cover you need an FCA-authorised intermediary. InsuranceDico is not FCA-authorised and cannot place cover.

Why do estimates vary so widely?

The low-to-high spread (typically 2.1×) reflects underwriter appetite differences across the UK market. Two insurers can quote the same risk at very different prices on the same day.

Where do the multipliers come from?

From the InsuranceDico Q1 2026 broker submission survey (n = 8 UK underwriters), BIBA member-firm data, and ABI commercial-lines rating notes. Full sources are on the methodology page.

BUSINESS · BUSINESS INTERRUPTION CALCULATOR

4-step

UK premium estimator, methodology published

Business Interruption Insurance Cost Calculator UK (2026)

InsuranceDico

Business

Business Interruption Insurance Cost Calculator UK (2026)

Reviewed by James Okafor, FCII·Updated 10 April 2026

View formula & sources

1Business type

2Employees

3Turnover

4Claims history

What kind of business is it?

Trade and construction profiles are loaded with a higher base rate to reflect physical-risk exposure.

INSIGHT

Base rate × headcount × turnover × trade loading × claims loading. Multipliers are sourced from InsuranceDico's Q1 2026 broker submission survey (n = 8 underwriters) and republished quarterly. Inputs are not stored or shared.

Cite this tool

InsuranceDico (2026). Business Interruption Insurance Cost Calculator UK. Retrieved from /business-insurance/business-interruption-insurance/calculator

What this tool does: returns a range and the inputs that produced it so you can challenge a broker's number. It is not a quote. InsuranceDico is not FCA-authorised and cannot place cover.

#methodology

How we calculate business interruption insurance cost

Every estimate on this page is built from a base rate of £95 multiplied by four factors: headcount, turnover band, trade risk loading, and claims history. The high estimate is the low estimate multiplied by a 2.10× broker market spread. Multipliers are sourced from our Q1 2026 broker submission survey (n = 8 UK underwriters), BIBA member-firm data, ABI commercial-lines rating notes, and FCA value-measures filings.

We publish the formula so any broker or accountant can audit our numbers. If a UK underwriter's number diverges from this range by more than 25%, ask them to itemise which factors they weight differently.

Full methodology & sources ⬇ Download methodology

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James Okafor

FCII · Chartered Insurance Broker

Lead Editor, Commercial Lines

Chartered insurance broker with two decades on the commercial side. James leads our SME and business insurance coverage.

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