How to Calculate Key Person Insurance Cover: Four Methodologies Explained

Identifying that your business needs key person insurance is the straightforward part. Calculating how much cover is appropriate is harder, and getting it wrong in either direction creates problems. Too little cover leaves the business under-capitalised in a crisis. Too much cover can trigger HMRC scrutiny and may indicate that the insurance is serving capital rather than revenue purposes — with implications for tax deductibility.

This guide explains the four principal methodologies for valuing key person insurance, HMRC's views on when premiums are deductible, and how to apply each method to different types of business and different categories of key person.

Why Key Person Insurance Needs Proper Valuation

When a key person — an individual whose skills, relationships, or leadership are materially important to the business — dies or becomes incapacitated, the financial impact on the business can be severe. Costs include:

• Recruitment and replacement — Senior roles take 6–18 months to fill. Executive search fees, temporary senior hires, and the time cost of the remaining leadership team can amount to hundreds of thousands of pounds.
• Lost business — Where the key person has client relationships, those relationships may transfer to a competitor. Lost revenue takes time to rebuild.
• Debt consequences — If a key person has personally guaranteed business loans, the bank may demand repayment or revised security on death. Directors of small companies frequently give personal guarantees on business borrowings.
• Operational disruption — Knowledge, processes, and institutional knowledge held by one person can delay projects, delay contracts, and create cascading costs while replacements come up to speed.

Key person insurance is designed to provide a capital sum that addresses these financial consequences. The methodology chosen to calculate the sum assured should directly reflect the nature of the financial risk the business faces.

Methodology 1: Multiple of Salary

The simplest and most commonly used approach is to insure the key person for a multiple of their annual remuneration.

Typical multiples:

• Death benefit: 3–5× annual salary for most employees
• Disability/critical illness benefit: 3–5× annual salary (sometimes higher, because the person may survive for many years unable to work)
• Senior executives and founders: 5–10× annual remuneration, reflecting their greater economic contribution

For a finance director earning £120,000, a death benefit of five times salary gives £600,000. For a founder-director earning £150,000, eight times remuneration gives £1,200,000.

Advantages: Simple to calculate and explain. Recognised benchmark for HMRC and insurers.

Disadvantages: May not reflect the actual financial impact on the business, particularly for founders or professionals whose economic contribution far exceeds their stated salary (for example, a director who draws a modest salary but contributes directly to £2,000,000 in annual profit).

Methodology 2: Profit-Based Valuation

A more sophisticated approach calculates the key person's actual contribution to the business's profitability and capitalises it.

Formula:

1. Identify the key person's estimated contribution to turnover (or gross profit)
2. Apply a multiplier reflecting the time needed to replace that contribution (typically 2–5 years)
3. Discount for the probability that some of the contribution would survive without the person

Example:

• Business turnover: £3,000,000
• Key person (sales director) estimated to be responsible for 40% of turnover: £1,200,000
• Gross profit margin: 30%, so key person contributes £360,000 gross profit
• Years to replace: 3
• Total exposure: £360,000 × 3 = £1,080,000
• Discount for residual business value: 20%
• Indicative key person sum assured: £864,000

Advantages: Reflects actual business risk. More defensible than arbitrary salary multiples for high-value contributors.

Disadvantages: Requires estimates and assumptions that insurers may scrutinise. The attribution of revenue to a single individual is inherently subjective.

For new businesses, this approach may be difficult to apply — historical revenue data is limited, and future projections are speculative. For established businesses with consistent trading history, it is the most financially accurate methodology.

Methodology 3: Loan Matching

Where a key person has personally guaranteed business loans, those loans represent a specific, quantifiable financial exposure. If the key person dies and the bank calls in a guaranteed loan of £500,000, the business faces an immediate cash crisis unless it has the funds or insurance to repay.

Key person insurance matched to the outstanding loan balance provides a direct solution.

Application:

• Business has a £600,000 commercial mortgage personally guaranteed by the managing director
• Director is additionally named as the operating guarantor on a £150,000 overdraft facility
• Total guaranteed exposure: £750,000
• Key person death benefit: £750,000 (or possibly reducing term to track the mortgage schedule)

Advantages: Precise, quantifiable, and clearly justified to HMRC and insurers. The link between cover and financial need is unambiguous.

Disadvantages: Covers only the loan guarantee exposure. Does not address broader revenue loss or replacement costs.

Loan matching is frequently used alongside one of the other methodologies — a business might hold £500,000 of loan-matching cover plus £250,000 of revenue-replacement cover, totalling £750,000 but addressing two distinct risks.

Methodology 4: Share Purchase Valuation

Where the key person is also a shareholder, there is an additional financial exposure: on death, the shares pass to the estate. The estate (or heirs) may have no interest in or capability to manage the business. The surviving shareholders may be forced into an unwanted partnership with executors, relatives, or external parties.

Share purchase (shareholder protection) insurance is designed to fund the surviving shareholders' purchase of the deceased's shares. The methodology is therefore:

• Agree a business valuation — typically EBITDA multiple for trading businesses, or net asset value for property and investment companies
• Identify each shareholder's percentage — key person cover matches their proportionate value
• Review valuation regularly — the policy sum assured must track the evolving value of the business; a company valued at £2,000,000 today may be worth £5,000,000 in five years

A shareholder owning 30% of a business valued at £2,000,000 would need £600,000 of shareholder protection. If the business grows, the cover should be reviewed and increased.

This is distinct from straightforward key person insurance (covering business disruption costs) and requires a cross-option agreement to be properly effective. Without a cross-option agreement, the insurance proceeds may be paid but the shares may not be legally transferable without additional processes.

HMRC Views on Tax Deductibility

HMRC's position on the deductibility of key person insurance premiums against corporation tax (or income tax for unincorporated businesses) depends on the purpose of the cover.

Revenue cover — deductible: Where the policy compensates for a revenue loss — the loss of profits directly attributable to the key person's absence — HMRC generally accepts the premium as a wholly and exclusively incurred business expense. The death or disability of a revenue-generating employee is a trading risk, and insuring against it is equivalent to insuring against other trading disruptions.

For HMRC to accept deductibility, three conditions broadly need to be met:

1. The relationship between the company and the insured is employer-employee (or equivalent director relationship)
2. The policy is short-term and not a whole-of-life or investment-type policy
3. The purpose is replacement of a revenue loss, not acquisition of a capital asset

Capital cover — not deductible: Where the policy provides capital to repurchase shares or to fund a capital acquisition, the premium is not deductible. Share purchase insurance premiums are generally not deductible against corporation tax. The death benefit itself, when received, may also be treated as a capital receipt — though this is fact-specific.

Loan guarantee cover: This is an area of some ambiguity. HMRC's published guidance suggests that where the policy is closely tied to a specific business loan and the purpose is revenue protection (keeping the business trading), deductibility may be available. Specialist tax advice is recommended for loan-matching policies.

Both deductibility and the treatment of the claim proceeds are interconnected. If premiums are deducted as a trading expense, the claim proceeds are likely to be treated as trading income. If premiums are not deductible (capital), the proceeds may be treated as capital receipts. The tax treatment must be consistent; HMRC will scrutinise arrangements that deduct premiums but seek capital treatment on proceeds.

Valuing Key Persons Who Are Not Revenue-Generators

Not all key persons contribute directly to revenue. Financial controllers, IT directors, compliance officers, and operations managers may be critical to the business without generating external income. For these individuals, the valuation methodology should focus on replacement costs.

A credible calculation would include:

• Executive search fee (20–30% of first-year salary = £30,000–£45,000 for a £150,000 role)
• Interim cover cost (temporary senior hire for 12 months = £120,000–£200,000 for a senior function)
• Knowledge transfer and training (estimated cost of documenting processes, training replacement)
• Productivity loss during transition (reduced output during the gap period)

Totalling these costs provides a justifiable sum assured based on documented replacement costs rather than a subjective multiple.

Existing Cover and Aggregation

When calculating how much new key person insurance is needed, account for cover already in place. Most businesses have group death-in-service for all employees, and some key persons may already have high sums under the group scheme.

Insurers apply overall limits on total cover per life across all policies. Disclosing existing cover on the key person insurance application is obligatory. The insurer will aggregate all cover and satisfy itself that the total is commercially justified.

Review Frequency

Key person insurance should not be set and forgotten. The financial position of most businesses changes materially over five years. Reviews should consider:

• Has the business grown significantly? (Sum assured may be inadequate)
• Have loan levels changed? (Loan-matching cover should adjust)
• Have share values changed? (Shareholder protection needs updating)
• Has the key person's remuneration changed? (Salary multiple cover should be updated)
• Have new key persons joined or existing ones left?

An annual review is a reasonable minimum for businesses that are actively growing. A full valuation exercise every three years ensures the cover remains well-calibrated to the actual business risk.

How Global Investments Can Help

Global Investments advises businesses across the UK and internationally on the design, valuation, and placement of key person insurance. We help identify who is genuinely key to business value, apply the most appropriate valuation methodology, structure cover correctly for HMRC purposes, and coordinate with the business's accountants and solicitors where required.

For international businesses with operations in multiple jurisdictions, we advise on cross-border structures — including cover for non-UK resident key persons who may require international underwriting arrangements. Contact us for a business protection review.

This guide is for information only and does not constitute regulated financial advice or tax advice. Tax treatment depends on individual circumstances and HMRC may take different views on specific arrangements. Seek independent professional advice from a qualified tax adviser before establishing key person insurance.