Family Trusts and Income Tax in Canada: How Trust Income Is Taxed

Setting up a family trust can be one of the most powerful moves in a Canadian tax and estate plan — but only if you understand how the income inside it actually gets taxed. Get it right and a discretionary trust can shift income to lower-rate family members, protect wealth across generations, and anchor an estate freeze. Get it wrong and the trust itself pays tax at the highest marginal rate in Canada.

This article explains the basics of family trust income taxation in Canada, with a focus on Ontario residents and business owners. We cover the key players, how the conduit principle works, the Tax on Split Income (TOSI) rules that changed the landscape in 2018, preferred beneficiary elections, the 21-year rule, and what you can realistically expect to pay and file. All rates and figures referenced are as of writing — confirm current numbers with the CRA or a qualified accountant before making any decisions.

Treadstone Law handles the legal structure. For filing and compliance, you will need an accountant working alongside your lawyer.

The Cast of Characters in a Family Trust

Before the tax mechanics make sense, you need to know who does what inside a trust. A typical inter vivos discretionary family trust — created during the settlor's lifetime rather than by a will — involves three distinct roles:

The settlor's role is mostly structural. They generally cannot be a primary beneficiary of the same trust without triggering the attribution rules under the Income Tax Act, which would cause income to flow back to them for tax purposes. The trustees hold the real power: in a discretionary trust, they can allocate income and capital among beneficiaries however they see fit in any given year, subject to the trust deed and to the TOSI rules discussed below.

How Is Trust Income Taxed at the Trust Level?

A family trust is its own taxpayer under the Income Tax Act. It files a T3 return each year and pays tax on any income it retains — that is, income not distributed or allocated to beneficiaries.

Here is the critical point: trusts do not get the graduated tax brackets that individuals do. A trust that holds onto its income pays tax at the top marginal rate applicable to that type of income. For an Ontario-resident trust, that combined federal-provincial rate on interest and ordinary income is among the highest in the country. As of writing, confirm the exact current rate with your accountant, but assume it is materially higher than the rate most family members would pay individually.

The upshot is straightforward: retaining income inside the trust is almost never the goal. The structure exists to move income out to lower-rate beneficiaries in a tax-efficient way.

Distributing Income to Beneficiaries: The Conduit Principle

The most valuable feature of a family trust is the conduit principle. When a trustee allocates income to a beneficiary and the trust actually pays it or makes it payable in the year, that income is reported on the beneficiary's own tax return — not the trust's. The income also retains its character as it flows through: interest stays interest, dividends stay dividends, and capital gains flow as capital gains, each taxed at the beneficiary's own applicable rate.

A beneficiary who is a student with modest other income, for example, might pay a very low rate on trust income allocated to them. A spouse who earns a moderate salary might fall into a lower bracket than the business-owner parent. The trustee allocates strategically each year, and the CRA taxes each beneficiary accordingly.

This is why discretionary trusts are so useful: you do not have to lock in allocations when you draft the trust deed. The trustee decides year by year based on each beneficiary's actual income situation.

TOSI and Trust Distributions

The Tax on Split Income rules significantly curtailed income splitting through trusts, particularly for distributions to adults who are connected to a private business. If TOSI applies to an amount allocated from a trust to an adult beneficiary — generally a family member of a business owner — that amount is taxed at the top marginal rate in the beneficiary's hands, eliminating the lower-bracket benefit entirely.

TOSI can apply to dividends, interest, and certain capital gains flowing from a trust that invests in, or derives income from, a private corporation. There are important exclusions — for instance, an adult who makes a genuine, sustained labour contribution to the business, or a beneficiary who is 65 or older — but the rules are detailed and fact-specific. You cannot simply assume an exclusion applies without working through the analysis with a tax advisor each year.

Minor beneficiaries face an even stricter version: income allocated to minors from a trust connected to a private business has long been subject to the highest marginal rate under what is sometimes called the kiddie tax. Family trusts are not a reliable mechanism for splitting business income with children under 18.

Preferred Beneficiary Elections

A preferred beneficiary election is a lesser-known planning tool that allows a trust to allocate income to a beneficiary who has a qualifying disability or dependant status — without actually paying out the cash. The beneficiary includes the income on their return and pays tax at their own (often lower) rate; the trust retains the funds. This can be valuable when the goal is tax efficiency but the beneficiary is not in a position to receive or manage cash distributions directly. The election must be filed jointly by the trust and the beneficiary with the CRA by the applicable deadline.

Capital Gains and the Lifetime Capital Gains Exemption

Capital gains that flow through a trust to beneficiaries retain their character: each beneficiary includes the taxable capital gain on their own return and may use their own lifetime capital gains exemption (LCGE) — if eligible — to shelter it.

The LCGE is particularly important when a family trust holds shares of a qualifying small business corporation. A properly structured trust can potentially multiply access to the LCGE across multiple beneficiaries on the same share sale, sheltering an amount that one person alone could not. This is one of the primary reasons business owners in Ontario use family trusts. The planning must be done correctly well in advance of any sale: shares must be held for the required period, the corporation must qualify, and CRA's general anti-avoidance rules must be respected throughout.

Trusts themselves do not have a capital dividend account (CDA), but a holding corporation that is itself a beneficiary of the trust can receive capital dividends as part of a broader planning structure. This is more complex territory and warrants dedicated professional advice.

The 21-Year Rule: A Brief Introduction

Every inter vivos trust is deemed to dispose of its capital property at fair market value every 21 years. This triggers a deemed capital gain — taxable inside the trust — even if no assets are actually sold. The rule exists to prevent families from holding appreciated property inside a trust indefinitely without ever paying capital gains tax.

The 21-year rule does not make a family trust unworkable, but it does require advance planning. Typically, the solution is distributing appreciated assets out of the trust to beneficiaries before the deemed disposition date, triggering the gain at the beneficiary level rather than inside the trust where it would be taxed at top rates. This is a topic that deserves its own dedicated article and its own planning timeline, but the key takeaway is this: if your trust is approaching the 21-year mark, act well in advance.

Trust Tax Filing Obligations

A family trust must file a T3 Trust Income Tax and Information Return each year, even in years where no income is earned or distributed. The filing deadline is 90 days after the trust's fiscal year-end — most trusts use a calendar year ending December 31. Late filing penalties apply, and the CRA has been increasing scrutiny of trust filings in recent years.

Recent legislative changes have significantly expanded T3 reporting requirements. Trusts must now disclose detailed beneficial ownership information — including the settlor, all trustees, and all beneficiaries — in a new schedule filed with the T3. This increased transparency obligation is worth understanding before you create a trust, not after it is up and running.

Your accountant prepares and files the T3. Treadstone Law advises on the trust deed and legal structure; the ongoing filing relationship belongs with a qualified tax professional.

Practical Uses of Family Trusts in Ontario

With the TOSI rules in place, the most defensible uses of a discretionary family trust in Ontario today tend to be:

Estate freeze. A business owner crystallizes the current value of their company in preferred shares held personally, and the trust subscribes for new common shares at a nominal value. Future growth in the company accrues to the trust — and through it, to the next generation — outside the owner's estate. This reduces Ontario probate fees (Estate Administration Tax) and can defer capital gains tax until the shares are ultimately sold or the trust reaches its 21-year anniversary.

LCGE multiplication. As described above, qualifying beneficiaries can each claim their own lifetime capital gains exemption on shares held through a trust, potentially sheltering a significant multiple of what one person alone could shelter. The planning must be done correctly, cleanly, and well in advance of any sale.

Creditor protection and succession. Assets held inside a trust generally sit outside the settlor's personal estate and may be better insulated from personal creditors. They also pass without a will, avoiding probate and keeping the arrangement private.

Income splitting for lower-rate adult family members who genuinely contribute to the business remains possible — but it requires careful annual review of TOSI eligibility before any allocation is made.

The Cost-Benefit Question

A family trust is not free or simple. Setup requires a lawyer to draft the trust deed, coordination with an accountant on any corporate reorganization, and potentially a valuation if shares are being frozen. Annual T3 filings add recurring accounting costs. The new disclosure requirements are increasingly onerous.

For a business owner with a company of meaningful value and beneficiaries who can genuinely benefit from income allocations or LCGE multiplication, the economics often work clearly. For a family with modest investments and no private company, the cost and complexity frequently outweigh the benefit.

The honest starting point is a planning conversation, not a trust deed.