The growth-share and freezer-share architecture is the structural engine that makes a Family Investment Company efficient as a wealth-transfer vehicle. Without the share-class split, the FIC is just a property company; with it, the company shifts all future capital growth out of the founder's estate from day one of issue, without crystallising IHT or CGT on the founder.

The mechanism is straightforward in concept: the founder holds shares that are "frozen" at the company's current value; the children (or a trust for the children) hold shares that participate in all future growth above that value. The complications sit in the design detail: where to set the hurdle, how to value the growth shares at issue, how to avoid the Employment Related Securities trap, what restrictions to embed, and how to document the architecture for HMRC inspection.

This page is the mechanics deep-dive on the share-class design. The wider FIC structural reference is in our FIC comprehensive guide; the choice between FIC and discretionary trust as the holding vehicle is in our FIC vs trust comparison.

The Building Blocks

Freezer Shares (Founder Class)

Freezer shares are held by the founder. They are designed to capture the value of the company up to a specified threshold (the "hurdle") plus, typically, a cumulative preferred dividend. Future growth above the hurdle does not accrue to the freezer shares; it goes to the growth-share class.

The defining rights:

  • Capital entitlement on winding-up: entitled to the hurdle value plus accumulated unpaid dividends, ahead of the growth shares. Growth-share holders receive nothing until the freezer shares are paid in full.
  • Dividend: typically a fixed cumulative coupon (eg 5% per annum on paid-up value). The dividend can be paid in cash or rolled up.
  • Voting: usually retained at 100% (or a controlling majority).
  • Growth participation: nil. The whole point of the class is that future growth bypasses it.

Growth Shares (Children's Class)

Growth shares are typically held by the children, or by a discretionary trust for the children. They are designed to participate in capital growth above the hurdle.

The defining rights:

  • Capital entitlement on winding-up: entitled to all value in excess of the freezer-share capital and accrued dividends. If the company is worth less than the hurdle at winding-up, the growth shares are worthless.
  • Dividend: discretionary, set by the directors. Usually no fixed entitlement.
  • Voting: usually nil or minimal (eg 1 vote per 100 shares for symbolic representation).
  • Growth participation: 100% of growth above the hurdle.

Setting the Hurdle

The hurdle is the threshold above which the growth shares participate. Setting it correctly is the most important design decision in the architecture.

The standard rule: the hurdle equals the company's current market value at the date the growth shares are issued, plus a small uplift. A property FIC worth £3m at the date of growth-share issue should have the hurdle set at £3m (or £3.05m with a modest uplift).

The reason for the rule: where the hurdle equals current value, the growth shares have no immediate economic substance (the company has no current value above the hurdle), and their initial value is a small optionality premium reflecting the possibility of future growth. The growth shares can be issued at a low subscription price (or gifted) without producing a material market-value transfer from the founder.

If the hurdle is set materially below current value (eg £2m hurdle on a £3m company), the growth shares have immediate economic value (£1m of company value above the hurdle accrues to them). The founder is effectively gifting that £1m of value to the growth-share holders, with full CGT and IHT consequences. This is the most common design mistake.

Valuing the Growth Shares at Issue

Even where the hurdle is properly set, growth shares are not worth zero at issue. They are worth a small optionality premium reflecting the future possibility of growth. Typical professional valuations for property-FIC growth shares come in at 1% to 5% of the underlying company value, depending on:

  • The expected growth rate of the underlying property (higher growth produces higher option value).
  • The expected time to realisation (longer time produces higher option value).
  • The volatility of the underlying value (more volatile property classes produce higher option value).
  • The dividend coupon on the freezer shares (higher coupon depletes growth-share value faster).

The standard methodology is a Black-Scholes-style option-pricing model adapted for the share-class characteristics, applied by a specialist valuation firm. The valuation report is the principal evidence on HMRC enquiry. A short bullet-point internal estimate is not adequate; a formal written valuation by a third-party specialist is.

The valuation work typically costs £3,000 to £8,000 and should be commissioned at each material issue of growth shares (and on each significant gift of existing growth shares, since the value is needed for the gift's CGT and IHT computations).

The single most expensive design failure in property-FIC architecture is the Employment Related Securities (ERS) trap under Chapter 2 of Part 7 ITEPA 2003.

What ERS Means

Where a person who is an officer (director, secretary) or employee of a company acquires shares in that company on terms more favourable than an unconnected third party would have received, the shares are Employment Related Securities. The "undervalue" element (the difference between the price paid and the unrestricted market value) is taxed as employment income in the acquirer's hands, with PAYE and NIC consequences.

The ERS rules apply even where the shares are acquired by family members of the director, not just the director directly. So a property FIC where the founder is a director and the founder's children (also directors, or about to become directors) acquire growth shares can fall within ERS unless the structure is designed to avoid it.

The Practical Risk in a Property FIC

Consider a property FIC worth £3m where the founder issues growth shares to two children, both of whom are also directors of the FIC for governance reasons. The growth shares are valued by a specialist at £30,000 (1% of company value). The children pay £30,000 for the growth shares.

Without protection, if HMRC later challenges the £30,000 valuation and asserts the unrestricted market value is £150,000, the £120,000 difference is treated as employment income on the children. At the 40% higher rate, that is £48,000 of income tax plus £15,600 of employee NIC, plus employer NIC on the FIC.

The Section 431 Election Protection

The protection is a joint election under section 431 ITEPA 2003 by the employer (the FIC) and the employee (each child), made within 14 days of the share acquisition. The election treats the shares as having been acquired at unrestricted market value, crystallising any income tax charge upfront on the initial (small) valuation.

Once the section 431 election is in place, subsequent growth in the share value is taxed as capital gain rather than employment income. The election is cheap to make (it is a one-page form jointly signed by employer and employee), and the consequence of failing to make it can be a five- or six-figure income tax exposure on future growth.

The election should be made at every growth-share issue to anyone who is or might become a director or employee of the FIC. The 14-day window is strict.

Documentation Requirements

The architecture is only as good as the documentation supporting it. Standard documentation includes:

  • Articles of association drafted to define each share class's rights in detail. Standard Companies House model articles are inadequate for an FIC.
  • Shareholders' agreement covering reserved matters, pre-emption rights, dispute resolution, drag-along and tag-along rights, and dividend policy.
  • Subscription documents for each share issue (founder freezer-share subscription at formation; subsequent growth-share subscriptions).
  • Share certificates issued under company seal or director's signature.
  • Board minutes recording each share issue, the rationale, the value, and the issue price.
  • Specialist valuation reports at each share issue and at each subsequent gift of existing shares.
  • Section 431 elections for each share acquisition by a director or employee, within 14 days.
  • HMRC notifications (Form 42) for ERS-relevant transactions, by 6 July following the end of the tax year.
  • PSC register entries on Companies House for persons with significant control.

The documentation should be assembled at the design and implementation stage, not retrospectively. Retrospective documentation creates contemporary-evidence problems on HMRC enquiry.

Worked Example: £3m Property FIC Growth-Share Issue

Mr Singh forms Singh Property Holdings Ltd in March 2026 to hold an existing portfolio worth £3m (six BTL flats across Leeds, currently held personally). The structure on day one:

  • Mr Singh transfers the portfolio to the FIC, claiming s.162 incorporation relief (he meets the Ramsay test).
  • In exchange, Mr Singh receives 1,000 freezer shares (A-shares) with a hurdle of £3m, a 5% cumulative preferred dividend, and 100% voting rights.
  • The FIC also issues 1,000 growth shares (B-shares) for £30,000 to a discretionary trust for Mr Singh's two children (ages 16 and 19). The growth shares have 0 voting rights and are entitled to all value above the £3m hurdle on winding-up.
  • Mr Singh is the sole director and the children's mother is one of the trustees; an independent solicitor is the other trustee.

A specialist valuation at issue values the growth shares at £36,000 (1.2% of company value, based on an option-pricing model with assumed 3% annual property growth, 10-year horizon, and assumed property volatility). The trust pays £36,000 to subscribe, raised by Mr Singh as a low-interest loan to the trust.

Section 431 elections are not needed because the growth-share holder is the trust (not an employee or director). Form 42 notifications are not needed for the same reason.

Ten years later, the property portfolio is worth £4.5m. The freezer shares are entitled to £3m of capital on winding-up (plus £1.5m of accrued cumulative dividends, since none have been paid). The growth shares are entitled to the residue, which is roughly £0 (because the cumulative dividend has soaked up all the growth). The architecture has not worked as intended; Mr Singh should have either paid the dividend (creating cash extraction) or set the cumulative dividend lower (preserving more value for the growth shares).

This trade-off (dividend coupon vs growth-share value) is the principal design lever. A 0% dividend allows all growth above the hurdle to accrue to the growth-shares; a 5% cumulative dividend soaks up substantial growth into the freezer shares. Property FICs typically use a low-or-zero dividend coupon on the freezer shares to maximise the growth-share accrual.

Common Design Mistakes

1. Hurdle Set Below Current Value

Growth shares with a hurdle below current value have immediate economic value, and the issue is effectively a market-value gift from the founder. CGT and IHT crystallise on the difference. The fix is to set the hurdle at current market value at issue.

2. No Specialist Valuation

An internal estimate of growth-share value is inadequate for HMRC purposes. A specialist valuation by a recognised firm, using a recognised methodology, is the standard expectation.

3. Missing Section 431 Election

Where growth shares go to family members who are directors or employees of the FIC, the 14-day section 431 election window is the most expensive single deadline in the architecture. Missing it can transform a small initial CGT charge into a large income-tax-and-NIC charge on future growth.

4. Excessive Dividend Coupon on Freezer Shares

A high cumulative dividend coupon on the freezer shares soaks up the growth that would otherwise accrue to the growth shares, defeating the architecture. Property FICs typically use 0% or low-single-digit dividend coupons.

5. Inadequate Articles or Shareholders' Agreement

Standard model articles and a generic shareholders' agreement do not adequately define the share-class rights, the reserved matters, the pre-emption mechanics, or the dispute resolution route. Bespoke drafting by a specialist corporate solicitor is the minimum standard.

6. Issuing Growth Shares to Minor Children Directly

Growth shares issued directly to minors create legal-capacity issues (minors cannot validly hold shares in their own name in most circumstances). The usual fix is to issue to a bare or discretionary trust for the minor.

Alternative Architectures

While the freezer-plus-growth architecture is the standard, alternatives exist:

  • Multiple growth-share classes: a separate B, C, D class for each child, allowing differentiated rights and exit mechanics per child.
  • Convertible preference shares: a freezer-share class that converts to ordinary shares on a specified trigger (eg the founder's death).
  • Tiered hurdles: growth shares with multiple hurdle bands (eg first £500k of growth to junior class, next £500k to mid class, balance to senior class). Useful where the founder wants graduated wealth transfer.
  • Charitable contingent class: a residual class held by a charitable beneficiary in case the family structure changes, providing a default fallback.

For most property FICs, the standard two-class structure (freezer + growth) is adequate. Complications are added only where the family circumstances genuinely require them; over-engineering the architecture adds administrative cost without adding wealth-transfer benefit.

How This Sits Within the Wider FIC Picture

The growth-share + freezer-share architecture is the wealth-transfer engine. The wider FIC mechanics (corporate structure, governance, funding, tax treatment in life and death) are covered in our FIC comprehensive guide. The decision-focused threshold question (is an FIC right at all?) is in the existing FIC: is it worth it? page.

The single most important practical recommendation is to commission specialist valuation, share-class drafting, and section 431 election support upfront, not retrospectively. The cost of getting the architecture right at the start is a fraction of the cost of unwinding a poorly-designed structure later.