A clear guide to trust funds: how the trust structure works, the four sources of returns, product categories by risk, benefits and drawbacks, the US shift from mutual funds to CITs, and how to choose the right fund.
How the trust structure turns retail capital into a distributable asset interest
A growing number of capital holders are no longer content to leave their money sitting in a bank demand account; instead, they hope to use funds and trust products to let their assets generate cash flow and appreciation under professional management. Yet the moment "trust fund" is mentioned, understanding often diverges: some associate it with the wealth-succession structures of high-net-worth families, some equate it with an ordinary public investment fund, and others simply conflate it with the wealth-management trust products found on the market. Before making a capital allocation decision, it is worth first clarifying this instrument's legal architecture, operating mechanism and true boundaries.
A trust fund is a collective investment vehicle that operates through a trust legal structure. Its basic logic is this: investors hand their money to a trustee (typically a bank, trust company or fund management company), a professional investment team manages it collectively and allocates it to underlying assets such as equities, bonds, money market instruments or real estate, and returns are distributed to investors according to the units they hold. Put in neutral terms, the contributor provides the capital, the trust structure holds and nominally owns the assets in a fiduciary capacity, the professional team is responsible for investment decisions, and the contributor enjoys interest, dividends, capital gains and other interests in proportion to their units.
Two meanings of the same term across different jurisdictions
The trust fund is not a single concept across different markets. Understanding its variations helps avoid confusing an investment-type product with a succession-type legal structure.
In markets such as Hong Kong, Singapore and the UK, a trust fund usually refers to a unit trust (Unit Trust), which is similar in nature to a public fund or mutual fund. An investment company or trust company pools the money of numerous investors, and a professional team collectively allocates it to equities, bonds, money market instruments or real estate, then distributes returns according to units.
In the United States, a Trust Fund may also refer to a legal trust used for wealth succession, serving asset protection, estate planning and tax planning. Common types include revocable trusts, irrevocable trusts, charitable trusts and special needs trusts.
Whichever form is taken, its essence is to use a trust structure to manage and distribute assets collectively, giving investors or beneficiaries clear and enforceable interests in the assets. To help distinguish two core concepts that are easily confused, the table below sets out a conceptual comparison of similar terms.
| Dimension of comparison | Unit trust / collective investment trust | Mutual fund | Wealth-succession legal trust |
|---|---|---|---|
| Core purpose | Pool capital for public-market investment to generate returns | Pool capital for public-market investment to generate returns | Asset segregation, estate distribution, tax planning and intergenerational succession |
| Legal shell | Trust deed, with the trustee holding the assets | Corporate or contractual form, largely governed by securities regulation | Trust deed, with the settlor establishing it and injecting assets |
| Entry threshold | Public in nature, generally with a low threshold | Aimed at retail and institutional investors, with a low threshold | Mostly high-net-worth families and business owners |
| Principal beneficiaries | Fund unit holders | Fund unit holders | Family members or charitable objects designated by the settlor |
The underlying assets determine this product type's four sources of cash flow
Whether it is a unit trust, a collective investment trust (CIT), or a fund product wrapped in a trust structure, its returns all derive from the underlying assets themselves. The composition of returns falls mainly into four categories.
Interest income
When a trust fund is allocated to fixed-income assets such as government bonds, corporate bonds, money market instruments or time deposits, it collects interest on a regular basis. For bond-oriented and money-market trust funds, interest is usually the most stable source of return.
Dividend and distribution income
When a trust fund holds equities or real estate investment trusts (REITs), it collects dividends or distributions according to the number of shares or units held. For trust funds focused on high-dividend equities and REITs, this cash flow is crucial. The cash received can either be reinvested or distributed to investors according to units.
Capital gains
Through research and screening, the fund manager buys assets when they are relatively undervalued and sells them at an appropriate price, thereby producing a spread between the purchase and sale prices. This spread is the capital gain, an important source of return for equity and mixed trust funds. The level of capital gains depends on market movements as well as the fund manager's stock-selection and market-timing ability.
Foreign exchange gains and losses
When a trust fund invests in overseas assets, or holds securities denominated in multiple currencies, exchange-rate movements bring additional gains or losses. The net asset value volatility of a globally allocated trust fund must, in addition to asset-price factors, take exchange-rate effects into account. If a product holds multi-currency assets at the same time, the exchange-rate change itself constitutes a distinct risk and return variable.
Categorising investment-type products by a risk-and-return gradient
To make it easier to judge risk and return characteristics, investment-type trust funds can be broadly classified into several categories according to their underlying assets.
Money market type: Invests mainly in money market instruments such as short-term government bonds, bank deposits, commercial paper and repurchase agreements. Risk is extremely low and liquidity strong, returns are slightly higher than a demand deposit, and volatility is very small; it is suited to parking short-term idle capital and to extremely conservative investors.
Bond type: Investment targets include government bonds, corporate bonds, high-yield bonds and emerging-market bonds. Returns come mainly from interest, volatility is lower than for equity funds, but it is relatively sensitive to interest-rate changes (prices may come under pressure during rate-hike periods); it suits investors who seek relatively steady returns and can accept a degree of net asset value volatility.
Equity type: Holds mainly equities and equity-type securities. Risk and volatility are the highest, with greater long-term growth potential; it suits aggressive investors with a stronger risk tolerance and an investment horizon of three to five years or more.
Mixed / multi-asset type: Allocates simultaneously to equities, bonds and cash, and even commodities and REITs, balancing return and risk through asset allocation and diversification; it suits investors who want a single product to address most of their allocation while not wishing to rebalance frequently.
Real estate investment trusts (REITs): Invest collectively in a trust form in rentable real estate (offices, shopping centres, logistics and warehousing, data centres, etc.), with rent as the core source of income.
The tax treatment of REITs carries a clear distribution obligation. Under US rules, a REIT must distribute at least 90% of its taxable income (excluding net capital gains) to holders in the form of dividends in order to qualify for the dividends-paid deduction and thereby be exempt from corporate income tax; the retained portion is taxed at the 21% corporate tax rate. In practice, most REITs distribute all of their taxable income to eliminate corporate-level tax entirely. (Source: U.S. Securities and Exchange Commission, Investor Bulletin: Real Estate Investment Trusts)
The benefits of trust funds can be understood on four levels from an investor's perspective
Professional management that saves time and effort: A research team and fund manager handle macro, sector, individual stock, bond and valuation analysis. Ordinary investors need not watch the market themselves, read financial statements or build models; in effect, they outsource professional services in exchange for a management fee, which is essentially a tool that trades cost for a professional division of labour.
Diversification that reduces single-holding risk: A single trust fund often holds dozens or even hundreds of assets, so the impact of an individual company blowing up or a single bond defaulting on the overall portfolio is smoothed out. Regulators worldwide generally impose diversification requirements on collective investment vehicles to avoid concentration risk.
A relatively low entry threshold: Public unit trusts usually require only a few hundred to a few thousand in starting capital, which is far lower than directly buying an investment property or participating in a private fund, giving ordinary investors access to a broader range of assets such as the bond market, global equities and REITs.
Relatively friendly liquidity: Most open-ended trust funds allow subscription and redemption at daily or periodic net asset value, which, compared with non-standard products that have long lock-up periods and difficult exits, is closer to a tiered wealth-management tool.
Cost, liquidity and the human factor form three drawbacks
Fees erode returns over the long term: Common fees include an annual management fee, custody fee, sales service fee and distribution fee, and some products also set a performance fee. Even though collective investment trusts and CITs are favoured by institutions for their relatively low costs, over the long term fees remain an important factor compressing compounding. The US Department of Labor once noted that, over a continuous 35-year savings period, a difference of 1% in the annual fee rate could erode a retirement account balance by around 28%. (Source: U.S. Department of Labor, A Look at 401(k) Plan Fees)
Not all products are easy to redeem: Money-market, open-ended bond and equity trust funds generally have good liquidity, but some closed-ended trusts, project-based trusts and long-term real estate trusts may not be redeemable partway through, or can only be sold at a discount on the secondary market. Overlooking this may mean discovering that funds are locked up just when cash is urgently needed.
Performance depends heavily on the manager: The performance of actively managed products is highly correlated with the calibre of the fund manager's team. Good past performance is no guarantee that style drift will not occur in the future, or that operational flexibility will not be lost owing to excessive size.
Complex structures and terms that are easily misrepresented by marketing: Especially for products involving trust structures, special tax arrangements and leverage terms, focusing only on the annualised return and marketing language while overlooking the detail of the terms can easily lead to misjudging the true risk and liquidity constraints.
A tiered picture of the US market, from pension trusts to family trusts
Investment-type trusts: CITs and REITs
Collective investment trusts are established and managed by banks or trust companies, primarily aimed at tax-advantaged retirement plans such as 401(k)s; ordinary retail investors cannot buy them directly, and they are in nature similar to mutual funds designed for institutions and pensions. They are not governed by the mutual-fund regulations of the US Securities and Exchange Commission (SEC), but fall under banking supervisory frameworks such as that of the US Office of the Comptroller of the Currency (OCC). With lower costs and more flexible fee arrangements, CITs continue to expand their share in the US pension arena.
The latest data show that this migration has reached considerable scale. As at the end of 2025, CITs accounted for nearly 40% of 401(k) plan assets, at around USD 3.8 trillion, up from about 30% at the end of 2019. In the target-date fund space, CITs overtook mutual funds for the first time in 2024 to become the dominant vehicle, and by the end of 2025 their share had risen to 54% of target-date assets. (Source: Morningstar, 2026 Target-Date Fund Landscape)
REITs exist in trust or corporate form and are, in essence, vehicles for collective investment in real estate. Only by distributing at least 90% of their taxable income to holders can they qualify for preferential tax treatment. Ordinary investors can trade listed REITs on an exchange just like buying and selling shares.
Wealth-succession trusts
In the United States, families and high-net-worth individuals often inject assets such as cash, equities, funds and property into different types of trust:
Revocable living trust: The settlor can amend or revoke it while alive; its advantage is that it simplifies the estate-distribution process and avoids cumbersome probate.
Irrevocable trust: Once established it is generally difficult to change, its purpose being asset segregation, tax planning and family asset protection.
Charitable trusts and special needs trusts: These combine charitable giving with tax benefits, and provide long-term financial security for beneficiaries with special needs.
These structures in themselves constitute a "trust fund", within which various investment-type funds, equity and bond assets can be held. As regards the tax environment for succession planning, the One Big Beautiful Bill Act (OBBBA), signed into effect on 4 July 2025, permanently raises the federal estate and gift tax exemption to USD 15 million per person, or USD 30 million per couple, from 1 January 2026, with the excess subject to a top rate of 40%; the previously anticipated halving of the exemption will no longer occur. (Source: Internal Revenue Service / Public Law 119-21, OBBBA)
Real industry events related to the article's theme and their impact
In recent years the US pension market has undergone a structural migration that bears directly on the collective investment trust category of trust fund described in this article.
Cause: From the 2010s, large retirement plans, driven by a sustained demand for lower fee rates, began shifting assets from mutual funds to CITs. Because CITs are exempt from SEC registration and prospectus requirements, their administrative and marketing costs are lower, and their net fee rates often have the advantage.
Development: In 2024, CITs overtook mutual funds for the first time to become the largest vehicle in the target-date fund space, with a share of about 52%; in 2025 this proportion rose to 54%. In 2025 alone, asset managers converted around USD 54.3 billion of target-date mutual fund assets into CITs. (Source: Morningstar, 2026 Target-Date Fund Landscape)
Impact on the industry: While the migration brings cost savings, it also raises concerns about transparency and the regulatory framework. Researchers and regulators point out that the rules governing CITs were not designed for a multi-trillion-dollar industry serving millions of retirement savers; disclosure is relatively limited, making external oversight and the assessment of fiduciary responsibility more complex. At the same time, legislative discussion of extending CIT access to 403(b) plans is also advancing.
Investors with different risk profiles correspond to different types of trust fund
Trust funds suit investors who wish to diversify risk, lack the time to research the market, prefer professional management and can accept a degree of net asset value volatility. They can be matched by risk profile as follows.
Conservative investors: Suited to money-market and bond trust funds, seeking steady interest income and low volatility.
Balanced investors: Suited to mixed and multi-asset allocation trust funds, seeking a balance of risk and return.
Aggressive investors: Suited to equity, thematic and global equity trust funds, seeking long-term growth potential.
Investors with cash-flow needs: Suited to REITs or high-distribution trust funds, with distributions as the primary source of return.
Investors needing global asset allocation: Can use trust funds to gain exposure to overseas equity, bond and real estate markets.
High-net-worth families and business owners: Where asset protection and wealth succession are involved, they can adopt a legal trust structure, such as a US-style living trust.
Seven review steps to follow when selecting a suitable product
The most suitable trust fund should match one's personal risk tolerance, investment horizon and capacity to bear costs, and be able to deliver stable returns consistent with one's objectives over the long term. The review can proceed in the following order.
Determine the risk level: First judge whether you are suited to a money-market, bond, mixed or equity type.
Examine the underlying assets: Check the sectors, countries and bond types the fund invests in, and confirm that the risk is consistent with your objectives.
Focus on long-term performance and drawdown: Look beyond short-term returns to examine three-to-five-year returns, maximum drawdown and volatility.
Break down the fee structure: Management, custody and sales service fees erode returns over the long term, so the more transparent the disclosure the better.
Assess the management team: Understand whether the team is stable, whether the research and investment process is clear, and whether the style is consistent.
Verify liquidity: Confirm whether it is open for subscription and redemption daily, whether there is a lock-up period, and whether the assets are easy to value and sell.
Check regulatory and platform credentials: Give preference to platforms whose products are issued by licensed institutions and that offer complete and compliant disclosure.
The principle for calculating the net asset value per unit of a REIT can be expressed as follows:
The net asset value per unit of a REIT is written as
Net asset value per unit = (total trust assets − total trust liabilities) ÷ total number of units issued
As far as the investment decision is concerned, the key is not which fund has the highest return, but whether it matches your own risk tolerance, investment objectives and capital planning. Understanding the definition of a trust fund, how it makes money, the boundaries of its strengths and weaknesses, and how it differs from an ordinary fund is a prerequisite for incorporating it into an asset allocation.
Questions related to trust funds
What is the core difference between a trust fund and an ordinary mutual fund?
Mutual funds mostly exist in a corporate or contractual shell, are generally governed by securities regulators, and are publicly offered to retail and institutional investors. A trust fund uses a trust deed as its legal shell, with the trustee holding the assets. In the US context, a trust fund may also refer to a legal trust used for estate planning, whose purpose extends from investment returns to asset segregation and intergenerational succession.
Can ordinary individual investors buy US CITs directly?
No. Collective investment trusts are primarily aimed at qualifying retirement plans such as 401(k)s; individual investors cannot buy them directly and can only hold them indirectly through an employer-sponsored retirement plan. They are maintained by banks or trust companies and fall under banking supervisory frameworks such as that of the OCC, rather than the SEC's mutual-fund rules.
Why must a REIT distribute at least 90% of its taxable income?
This is a statutory condition for a REIT to maintain its preferential tax status. After distributing at least 90% of its taxable income (excluding net capital gains) to holders as dividends, a REIT can deduct the dividends paid on the distributed portion and thereby be exempt from corporate income tax; the undistributed portion is taxed at the 21% corporate tax rate. In practice, most REITs choose to distribute in full to eliminate corporate-level tax entirely.
Where do the returns of a trust fund come from?
There are mainly four categories: interest generated by fixed-income assets, dividends and distributions generated by equities or REITs, capital gains formed from the spread between purchase and sale prices, and foreign exchange gains and losses when holding overseas or multi-currency assets. Different types of product emphasise different return structures: bond types lean towards interest, and equity types towards capital gains.
Why have US pension assets shifted in large volumes from mutual funds to CITs in recent years?
The core driver is the fee rate. CITs are exempt from SEC registration and prospectus requirements, their administrative and marketing costs are lower, and their net fee rates are often better than those of mutual funds with a similar strategy. As at the end of 2025, CITs accounted for nearly 40% of 401(k) plan assets and had overtaken mutual funds to become the dominant vehicle in the target-date fund space.
