FOR INCORPORATED OWNERS

Why paying your spouse or adult kids dividends can quietly backfire.

TOSI doesn't ban income splitting. It taxes the specific version most people try first at the highest possible rate — while leaving several legal alternatives completely untouched.

The Tax on Split Income (TOSI) rules exist for one reason: to stop business owners from routing dividends to a spouse or adult child in a lower tax bracket purely to save tax. Since 2018, they apply to adults, not just minors — and they catch far more situations than most people expect.

The mechanism: it doesn't ban it, it prices it out

TOSI doesn't make family dividends illegal. It reclassifies them: if a payment counts as "split income" and no exclusion applies, it's taxed at the highest personal marginal rate — no graduated brackets, no benefit from the recipient's actual lower income. Combined federal and provincial, that can reach roughly 53–55% depending on the province, which erases the entire point of splitting the income in the first place.

Who TOSI actually catches

TOSI applies to a "specified individual" — a Canadian resident receiving income connected to a "related business," meaning a business where a family member (a "source individual") is actively involved. The rules apply differently depending on the recipient's age:

Under 18

Very limited exclusions. Most business-related income paid to minors is automatically caught by TOSI, essentially unchanged since the original 2000 rules.

18–24

Excluded only if actively engaged in the business on a "regular, continuous, and substantial basis" — generally meaning an average of 20+ hours a week during the year, or in five prior years.

25 and older

Broader exclusions available: "excluded shares" (owning at least 10% of both votes and value, in a business earning under 90% of its income from services) or a "reasonable return" on capital they genuinely contributed themselves.

65 and older

Can access pension income splitting with a spouse — a separate, more permissive mechanism than the TOSI exclusions above.

The exclusion that surprises professionals: the "excluded shares" exception explicitly does not apply to professional corporations — law, accounting, medicine, dentistry, and similar service-based practices. If that's your business, the 25-and-older exclusion is narrower than it looks at first glance.

What's never touched by TOSI, regardless of age

Salary is not split income, full stop. A family member who does genuine work in the business and gets paid a reasonable salary for it reports that income normally, at their own marginal rate — no TOSI exposure at all. This is exactly why "pay a fair salary for real work" remains the simplest, safest way to involve family members financially in a business.

Legal alternatives that still work in 2026

TOSI closed one door. It didn't close every door — these three remain fully legitimate, CRA-documented strategies:

Spousal RRSPs. The higher earner contributes using their own RRSP room, into an RRSP registered in the lower-earning spouse's name. On withdrawal, the income is taxed in the lower earner's hands — subject to a 3-year attribution rule on the most recent contributions, so this is a long-horizon strategy, not a quick fix.
Prescribed rate loans. A formal loan from the higher earner to a spouse or family trust, at the CRA's published prescribed rate — 3% as of mid-2026, unchanged since Q3 2025. The lower earner invests it, pays the prescribed interest back annually, and keeps the spread between what the investments earn and that rate, taxed in their own hands.
Reasonable salary for real work. Straightforward, and it also builds RRSP room and CPP entitlement for the family member being paid — TOSI has no opinion on this at all.

Why the prescribed rate loan is worth knowing about right now

At a 3% prescribed rate, a $500,000 loan invested in a portfolio earning 7% produces a 4-percentage-point spread — roughly $20,000 a year — taxed in the lower-earning spouse's hands instead of the higher earner's. The lower the prescribed rate, the wider that spread can be, which is exactly why this strategy gets more attractive when rates are low, and needs revisiting whenever the rate resets.

The honest bottom line: if your accountant hasn't specifically walked through which exclusion (if any) applies to each family member receiving money from your corporation, that conversation is worth having before dividends go out, not after a reassessment. TOSI planning is genuinely fact-specific — the same structure can produce different results depending on age, role, and documentation.

Model your household's real income, together with your goals — Compoundfork's household tagging shows who owns what, plainly.

Try Compoundfork →