Liquidity Risk in Investment Portfolios: What It Means and How to Manage It

The investment industry spends considerable time discussing return risk — the risk that markets fall and portfolios lose value. Less attention is given to liquidity risk: the risk that you cannot sell an investment when you need to, or that selling requires accepting a dramatically lower price than the investment's fair value.

For high-net-worth individuals, liquidity risk is particularly relevant. The most attractive investment opportunities — private equity, direct real estate, infrastructure, hedge funds with lockups — are typically illiquid. The illiquidity premium (the additional return available for accepting illiquid investments) is real and valuable. But it must be balanced carefully against genuine liquidity needs.

Defining Liquidity

Liquidity, in investment terms, describes the ease with which an investment can be converted to cash without material loss of value. The key dimensions are:

• Time to liquidation: how quickly can the investment be sold?
• Price impact: how much does the need to sell quickly affect the price you receive?
• Certainty: is the timeframe for liquidation reliable, or subject to discretion by the fund manager?

Using these dimensions:

• Cash is perfectly liquid: it can be converted instantly at no discount.
• Government bonds in major markets (UK gilts, US Treasuries) are highly liquid: the market is deep, daily turnover is enormous, and the price impact of selling a typical private client holding is negligible.
• Listed equities (FTSE 100, S&P 500 constituents) are very liquid during market hours: sell today, receive proceeds typically in two business days (T+2).
• Daily-dealing UCITS funds (unit trusts, OEICs, ETFs) are liquid: redemptions are generally processed next day or within a few days.
• Physical commercial real estate is illiquid: marketing, legal due diligence, and completion typically take three to six months. In a distressed market, the timeframe is longer and the price discount may be significant.
• Private equity fund interests are very illiquid: the typical lock-up period is ten years. There is a secondary market for PE fund interests, but it is thin and the discount to NAV can be substantial.

The Open-Ended Property Fund Crisis

The structural mismatch between the liquidity offered to investors and the liquidity of the underlying assets is best illustrated by the repeated crises in UK open-ended commercial property funds.

These funds — UK-authorised, investing in physical commercial property — offered daily or weekly dealing to retail investors. An investor could request redemption and, in principle, receive their money within a few days. The underlying properties, however, could not be sold in a few days — they might take six to twelve months to sell in an orderly process.

When investor redemption requests exceeded what the manager could fund from cash reserves, the manager faced two unpleasant options: sell properties quickly at distressed prices (destroying value for remaining investors), or "gate" the fund — suspend redemptions until sufficient properties could be sold in an orderly manner. Gating was used repeatedly: during the Brexit vote in 2016, again in 2019, and again in 2022 during market stress. Investors who needed their money found themselves unable to access it for months or, in some cases, years.

The Financial Conduct Authority (FCA) reviewed this structural problem extensively and, as of 2025, has implemented reforms requiring open-ended funds investing substantially in illiquid assets to operate longer dealing frequencies (for example, 90-180 day notice periods for redemption in some fund types). This better aligns the liquidity offered to investors with the liquidity of the underlying assets — but means that investors must accept reduced flexibility if they want access to property fund returns through a registered fund structure.

The Illiquidity Premium

The compensation for accepting illiquidity is real. Private equity has historically generated returns meaningfully above public equity markets over long periods (though comparisons are complicated by the differences in reporting, leverage, and selection bias in private equity performance data). Direct commercial property has historically offered attractive risk-adjusted returns in exchange for the illiquidity. Infrastructure funds similarly offer yield and capital preservation characteristics that are difficult to replicate with listed assets.

For a long-term investor — a 50-year-old with a 20-year investment horizon and no near-term liquidity need — capturing the illiquidity premium by allocating a significant portion of the portfolio to private markets is a rational strategy. For a 75-year-old with health concerns, significant illiquid allocations are inappropriate.

The Liquidity Bucketing Framework

The most practical tool for managing liquidity in a portfolio is the "bucket" approach. Assets are assigned to buckets based on the expected time horizon of the investment and the liquidity needs of the investor.

Bucket 1 (0–12 months): cash and near-cash. This bucket funds near-term living costs, planned expenditure (school fees, tax bills, property purchases), and emergency reserves. It should contain: bank accounts, money market funds, short-term government bonds, and NS&I products. The return on Bucket 1 assets is low, but the certainty of access is absolute. As a rule of thumb, this bucket should contain at least 12 months of total expenses.

Bucket 2 (1–5 years): liquid investments. UCITS equity and bond funds, ETFs, investment trusts. These can be sold within days in normal market conditions, though there is a risk that doing so coincides with a market fall. Having Bucket 1 funded removes the pressure to sell Bucket 2 assets at a bad time.

Bucket 3 (5–10 years): less liquid assets. Structured products (with defined maturity dates), hedge funds with quarterly dealing and lock-up provisions, open-ended property funds (post-FCA reform, these now have longer notice periods). These can be sold in an emergency but with some delay and potentially a discount.

Bucket 4 (10+ years): truly illiquid assets. Private equity, direct property, infrastructure funds, direct lending funds, timberland. These earn the illiquidity premium but cannot be accessed on short notice. The allocation to Bucket 4 should only cover capital that the investor genuinely does not need in the foreseeable future.

Warning Signs of an Over-Illiquid Portfolio

A portfolio that is over-concentrated in illiquid assets creates genuine risk — not investment risk in the traditional sense, but the risk of a forced sale at the wrong time. Warning signs include:

• More than 30–40% of the total portfolio in Bucket 3 and 4 assets for most investors.
• Significant borrowings (mortgages, margin loans) alongside illiquid assets. Margin calls and loan covenant breaches cannot be met with assets you cannot sell.
• Proximity to retirement — when income needs shift from return-oriented to income-oriented.
• Unreliable income — individuals whose earned income is variable (entrepreneurs, commission-based professionals) should hold more in Bucket 1 and 2 to manage income volatility.
• Health concerns or anticipated large future expenditure (care fees, school fees, property purchase).

Liquidity and Tax Planning

One aspect of liquidity risk that is frequently overlooked is its interaction with tax planning. Many tax-efficient structures are illiquid:

• Venture Capital Trusts (VCTs): the secondary market is thin; the shares must typically be held for at least five years to preserve income tax relief.
• Enterprise Investment Scheme (EIS): a three-year minimum holding period for income tax relief; the underlying companies are typically private and very illiquid.
• SEIS: similar to EIS.
• Pensions: pension assets generally cannot be accessed before the normal minimum pension age of 55 (rising to 57 on 6 April 2028). This is "designed" illiquidity.
• Offshore bonds: technically daily-dealing, but withdrawal charges in the first few years of some contracts may apply.

The tax efficiency of these structures is real. But the illiquidity must be counted as part of the overall portfolio liquidity assessment.

Managing Liquidity in Practice

Good liquidity management requires:

1. A clear map of all assets and their liquidity profiles — which bucket does each investment fall into?
2. A realistic assessment of near-term cash needs — known expenditure in the next 12-24 months.
3. A realistic assessment of unexpected liquidity needs — health events, business needs, family circumstances.
4. A stress test — if markets fell 30% and you needed to access 10% of your portfolio today, what would you sell and at what price?
5. Regular review — liquidity profiles change as investments mature, dealing restrictions expire, or life circumstances evolve.

Important Considerations

Past performance and historical liquidity profiles of investment types are not guaranteed in future market conditions. Market structures and regulatory requirements change — the FCA reforms to property fund dealing are one example. This article is intended as a general guide only and does not constitute investment advice. The appropriate liquidity profile for your portfolio depends on your personal circumstances, time horizon, income needs, and risk tolerance. Seek qualified independent financial advice. Investments can fall in value as well as rise, and you may get back less than you invest.

How Global Investments Can Help

Global Investments works with internationally mobile clients to design portfolios that balance long-term return objectives with realistic liquidity requirements. We assess your entire asset position — including property, business interests, and tax-advantaged structures — to understand the true liquidity profile of your wealth, and we build investment architectures that ensure you have access to capital when you need it while capturing the available return across all asset classes. Contact our team to arrange a portfolio review.