Prohibited Investment Rules for RRSP Mortgage Holdings: When a MIC Becomes a Trap

Most material on mortgage investment corporations (MICs) says their shares are “RRSP eligible” and stops there. That statement is generally true, but it answers only the first of two questions. A second set of rules — the prohibited-investment regime — looks at the relationship between the plan holder and the investment, and it can turn an eligible holding into a taxable problem for one particular investor while leaving everyone else unaffected.

The investors most exposed are those closest to a MIC: founders and directors, their families and holding companies, and anyone with a large position in a small MIC or a small share class. This page explains the mechanics as at October 2026. It is general education, not investment, tax or legal advice. Consult a Canadian tax professional before any registered plan subscribes for shares of a MIC in which you, your family or your companies hold a meaningful stake. Mortgage investments are not guaranteed, and principal can be lost; the rules below add a tax risk to the investment risk.

Qualified investment and prohibited investment: two different tests

A qualified investment is a type of property that registered plans are allowed to hold; a prohibited investment is property that is too closely connected to the particular plan holder. MIC shares are generally a qualified investment for a mortgage investment corporation that meets the Income Tax Act’s conditions — but qualification says nothing about the second test.

Basis of comparison: the two regimes as summarised at October 2026. The regulation’s exact wording is published on the Justice Laws Website and is not paraphrased here.

How the prohibited investment rules apply to RRSP mortgage holdings

The prohibited-investment rules apply to RRSPs, RRIFs, TFSAs, FHSAs, RESPs and RDSPs, as the title of CRA’s folio sets out. They are aimed at registered plans being used to invest in the plan holder’s own business or family affairs, and they reach mortgage investments in two main ways.

For MIC shares, under the prohibited-investment rules in section 207.01 of the Income Tax Act, the shares can become a prohibited investment for a plan if:

1. the plan holder, together with non-arm’s-length persons, has a significant interest in the MIC — 10% or more of the issued shares of any class; or
2. the MIC holds debt of the plan holder, or of persons not dealing at arm’s length with the plan holder.

For a mortgage held directly in a self-directed plan, the concern is the same in a more direct form: a mortgage owed by the plan holder or a non-arm’s-length person is a debt of exactly the kind the rules target.

Status is not fixed at the date of purchase. A holding that was fine when the plan subscribed can become a prohibited investment later, because the facts the test looks at — the class size, other people’s holdings, the MIC’s loans — keep changing.

The significant interest 10 percent rule for registered plans

The significant-interest test is crossed at 10% or more of the issued shares of any class, counting the plan holder’s shares together with those of non-arm’s-length persons. Three features make it easier to cross than investors expect.

• It aggregates. Non-arm’s-length persons generally include related persons — a spouse or common-law partner, other relatives the Act treats as related, and corporations you control. The folio explains how holdings in different accounts and entities are counted.
• It is per class. A MIC with several share classes is tested class by class. A modest stake overall can be a large stake in a small class.
• It moves with the denominator. The percentage depends on the number of shares outstanding, which falls when other shareholders redeem.

The glossary defines significant interest and non-arm’s-length in one line each; the folio is the authoritative explanation.

Why the MIC’s 25% rule does not protect you

The MIC’s own shareholder limit and the registered-plan test measure different things. Paragraph 130.1(6)(d) of the Income Tax Act requires a MIC to have at least 20 shareholders and prevents any shareholder, together with related persons, from holding more than 25% of the issued shares of any class. That is one of the nine conditions a MIC must meet to keep its tax status.

A MIC can be fully compliant at 25% while one of its shareholders’ registered plans is caught at 10%. Issuers watch the first test because it governs their own status; the second is the plan holder’s to track.

Worked example (illustrative)

The figures are invented to show the arithmetic and describe no real MIC.

Scenario 1 — aggregation. A MIC has 2,000,000 Class A shares outstanding.

• Investor’s RRSP: 120,000 shares = 6.0%
• Spouse’s TFSA: 50,000 shares = 2.5%
• Investor’s holding company: 40,000 shares = 2.0%
• Combined: 210,000 shares = 10.5%

No single account reaches 10%, but the combined holding does. The shares in the RRSP and in the spouse’s TFSA can be prohibited investments. The MIC itself is well within its 25% limit.

Scenario 2 — the class shrinks. The same family holds 190,000 shares, or 9.5% of 2,000,000. The family buys nothing more. Other shareholders redeem 150,000 shares, leaving 1,850,000 outstanding.

• New percentage: 190,000 ÷ 1,850,000 = 10.27%

The threshold was reached once redemptions brought the class down to 1,900,000 shares (190,000 ÷ 1,900,000 = 10.0%), because the test is 10% or more.

Scenario 3 — a small class. The MIC also has a newer Class F with 300,000 shares outstanding, alongside the 2,000,000 Class A shares. The investor’s RRSP holds 35,000 Class F shares.

• Share of Class F: 35,000 ÷ 300,000 = 11.67%
• Share of all 2,300,000 shares: 35,000 ÷ 2,300,000 = 1.52%

The holding is small overall and still crosses the line, because the test applies to any class. The way a MIC structures its classes is explained in MIC share structure.

When the MIC holds a debt of you or someone connected to you

The second route has nothing to do with percentages. If the MIC holds debt of the plan holder, or of persons not dealing at arm’s length with the plan holder, its shares can become a prohibited investment for that plan — even if the plan owns only a handful of shares. The conditions attached to qualified-investment status also look at debts owed to the MIC by people connected to the plan.

This catches situations that feel ordinary to the people involved: a shareholder’s company takes a mortgage from the MIC, an investor refers a relative who becomes a borrower, or a director’s family member refinances through the MIC. The MIC may not know the relationship unless someone tells it. An investor whose registered plan holds MIC shares can ask the MIC about its related-party lending policy, and disclose relationships before a connected borrower is funded.

Non-arm’s-length mortgages in an RRSP

Holding an individual mortgage in a self-directed RRSP raises the same issue directly. A mortgage owed by the plan holder, or by a non-arm’s-length person such as a relative or a company the plan holder controls, is a debt of a person connected to the plan holder. The rules contain narrow exceptions, set out in the legislation and explained in CRA’s folio; outside them, a non-arm’s-length mortgage in an RRSP is the kind of arrangement the prohibited-investment regime is designed to catch. For how arm’s-length direct lending works, see direct mortgage investing.

What happens if a MIC becomes a prohibited investment in your plan

When a plan holds a prohibited investment, special taxes apply to the plan holder rather than to the plan. In outline, as explained in CRA Income Tax Folio S3-F10-C2:

• A tax based on value. A special tax is calculated by reference to the fair market value of the prohibited investment. The rules provide for a refund in some cases if the investment is disposed of within a set time.
• A tax on income connected to it. Income and gains reasonably attributable to the prohibited investment can be treated as an advantage, which is subject to its own tax.
• Reporting. The plan holder reports these taxes to CRA on the return CRA prescribes for them.
• Relief. The folio describes the circumstances, if any, in which CRA may waive or cancel the tax.

The rates, deadlines and forms are in the folio and are not repeated here, because they are precisely the details a tax professional needs to apply to the facts. One practical point is specific to MICs: getting out may not be quick. MIC shares have no secondary market, and redemptions are subject to notice periods and the board’s right to defer or suspend them, so a plan holder trying to dispose of prohibited shares within a deadline may depend on the MIC’s redemption timing. See liquidity and redemption.

How to check before your plan subscribes

Each item names the document or source where the answer is found.

• The share classes and the number of shares outstanding in each — the capitalisation section of the offering memorandum, and the share-capital note to the audited financial statements. Reading a MIC’s financial statements shows where to look.
• Your combined holding in each class — your own records, your spouse’s statements, statements for companies you control, and your trustee’s statements.
• Whether the class is shrinking — investor reports, or a direct question to the MIC about recent redemptions.
• Whether the MIC lends to anyone connected to you — the related-party note to the audited financial statements, the lending policy in the offering memorandum, and your own knowledge of family and company borrowing.
• Any representations you are asked to make — the subscription agreement.
• Your conclusion — a Canadian tax professional’s review of the above, documented before the plan subscribes.

Common mistakes with registered plans and MIC shares

These come from the gap CRA’s folio addresses and from the questions investors ask after the fact.

• Stopping at “RRSP eligible.” Eligibility is the qualified-investment test only.
• Counting one account. The test aggregates you with non-arm’s-length persons across holdings.
• Using 25% as the benchmark. That is the MIC’s test, not the plan holder’s.
• Ignoring the denominator. Redemptions by others can push a static holding over 10%.
• Ignoring “any class.” A small class can be crossed with a small holding.
• Mixing borrowing and investing. Taking a mortgage from a MIC your plan invests in, or steering a relative to it, can trigger the debt route.

For the wider tax picture, see how mortgage investment income is taxed in Canada and the guide to holding mortgage investments in an RRSP, TFSA or RRIF.

What this means for a mortgage investor using a registered plan

MIC shares being RRSP-eligible is the start of the analysis, not the end: under section 207.01, the same shares can be a prohibited investment for a plan holder who, with non-arm’s-length persons, holds 10% or more of any class, or whose circle borrows from the MIC. The MIC’s 25% test does not cover this, and the status can change without any purchase. Beyond the tax wrapper, the investment still varies along seven axes — borrower, property, loan-to-value, security position, term, jurisdiction and investment structure — and the structure axis is where this trap sits. As at October 2026; consult a Canadian tax professional before relying on any conclusion about your own plan.