Step-Child Inheriting a $700,000 Ontario Estate in 2026: How Intestacy Law Treats Non-Biological Children and the Tax Difference a Will Makes

The Scenario: A Mississauga Step-Parent With No Will

Frank treated Nadia as his daughter. She lived with Frank and Linda for 15 years, called him Dad, spent holidays together after Linda died. Frank told Nadia she would be “taken care of.” He never put it in writing.

This is the part most blended families miss: in Ontario, good intentions are legally irrelevant without a will. The Succession Law Reform Act does not care how long Nadia lived in the household. It cares about legal parentage.

What Ontario's Succession Law Reform Act Says About “Children”

Ontario's intestacy rules — Part II of the Succession Law Reform Act (SLRA) — distribute the estate of a person who dies without a will according to a fixed hierarchy. When there is no surviving spouse, the entire estate goes to the deceased's “children” in equal shares.

The SLRA defines “child” to include:

• Biological children (including those born outside marriage)
• Legally adopted children

That is the complete list. A step-child who has not been legally adopted is not a “child” under the SLRA. Nadia is not in Frank's intestacy class. Under section 47(1) of the SLRA, the $700,000 estate passes entirely to Frank's two biological children — $350,000 each, before taxes and probate.

Nadia gets nothing. Not because Frank didn't love her. Because he didn't write a will.

Scenario 1: Intestacy — The Estate Goes to Biological Children

Without a will, the estate trustee (appointed by the court, likely one of the biological children) administers the estate under the SLRA intestacy rules. Here is the tax and distribution math.

Step 1: RRSP deemed disposition

Under section 146(8.8) of the Income Tax Act, the $220,000 RRSP is included as income on Frank's terminal T1 return. Linda predeceased Frank. There is no surviving spouse for a tax-deferred rollover. No financially dependent minor child qualifies for the infirm-dependent rollover. The full $220,000 is taxable.

At Ontario's top combined marginal rate of 53.53%, the tax on the RRSP collapse:

Step 2: Principal residence — no deemed-disposition tax

The $380,000 townhouse qualifies for the principal residence exemption (PRE) under section 40(2)(b) of the Income Tax Act. One property per family unit per year. Frank owned and occupied it as his principal residence. The full capital gain is sheltered. Tax: $0.

Step 3: Non-registered investment account

The $100,000 in non-registered investments triggers a deemed disposition at fair market value. The tax depends on the embedded capital gain. Assuming Frank bought these investments over the past decade with an adjusted cost base of $60,000, the capital gain is $40,000.

Under the 2026 capital gains rules: the first $250,000 of annual capital gains is taxed at a 50% inclusion rate. Frank's $40,000 gain falls entirely within this first tier.

• Taxable capital gain: $40,000 x 50% = $20,000
• Tax at ~48% marginal (stacked on top of the RRSP income): approximately $9,600

Step 4: Ontario probate (estate administration tax)

The RRSP has no named beneficiary — designation says “estate” — so the $220,000 flows into the estate and is subject to probate. The home passes through the will (or intestacy) as well. The non-registered account has no beneficiary designation.

Ontario probate on $700,000: $0 on the first $50,000, then $15 per $1,000 above.

• ($700,000 - $50,000) x $15 / $1,000 = $9,750

Intestacy summary: what the biological children actually receive

Each biological child receives approximately $290,000. Nadia — who Frank raised for 15 years — receives nothing.

Scenario 2: A Will Names Nadia as Primary Beneficiary

Now rewind. Assume Frank had written a simple will with one key provision: Nadia is the primary beneficiary of the entire estate, with the two biological children receiving specific bequests of $50,000 each. Frank also updated his RRSP beneficiary designation to name Nadia directly.

RRSP with Nadia as named beneficiary

The RRSP beneficiary designation overrides the will. With Nadia named directly, the $220,000 in RRSP proceeds are paid directly to Nadia by the financial institution. Key points:

• The $220,000 bypasses probate — it does not flow through the estate. Ontario EAT is not charged on these funds.
• The income tax on the RRSP collapse is still owed by the estate on Frank's terminal return. Nadia receives the full $220,000; the estate pays the ~$85,000 tax from the remaining assets.
• Nadia is not a “qualifying beneficiary” for a tax-deferred RRSP rollover (she is neither a surviving spouse nor a financially dependent child under 18 or with a disability). The full amount is taxable on the terminal return regardless.

Probate savings with the beneficiary designation

With the RRSP paid directly to Nadia, only $480,000 of the estate passes through the will (the $380,000 home + $100,000 non-registered).

• Ontario EAT on $480,000: ($480,000 - $50,000) x $15 / $1,000 = $6,450
• Probate savings vs. intestacy: $9,750 - $6,450 = $3,300 saved

Will scenario summary: what Nadia actually receives

The difference for Nadia: $486,950 with a will vs. $0 under intestacy. This is not a rounding error. It is the entire inheritance.

The Beneficiary Designation Trap: How an RRSP Can Disinherit a Step-Child Even With a Will

Here is a scenario that catches even families who do have a will. Frank writes a will naming Nadia as primary beneficiary. But he never updates his RRSP beneficiary designation, which still names his ex-wife from 2008 — or says “estate” from when he originally opened the account.

If the designation names the ex-wife: she receives the $220,000 directly. The will is irrelevant for the RRSP. If the designation says “estate”: the RRSP flows into the estate and is distributed per the will — Nadia gets it, but the estate pays probate on it ($3,300 more than necessary).

The worst case: the designation names the biological children. Frank updated his will but forgot the RRSP form. The will says “everything to Nadia.” The RRSP designation says “my children” — which the financial institution interprets as his biological children. Nadia loses $220,000 of the estate despite being the named beneficiary in the will.

Dependant's Relief: The Step-Child's Last Resort

If Frank dies intestate and Nadia receives nothing, she has one remaining option: a dependant's relief application under Part V of the SLRA (sections 57–62). This is a court application asking a judge to order support from the estate.

The SLRA defines “dependant” broadly enough to include a step-child — a person to whom the deceased was providing support or had a legal obligation to support immediately before death. But the standard for an adult step-child is steep:

• Financial dependence at the time of death. If Nadia at 32 is financially independent — employed, paying her own rent, not receiving regular financial support from Frank — the application is weak. The court looks at actual support being provided at the time of death, not historical support from childhood.
• Moral obligation alone is not enough. Ontario courts distinguish between legal obligation and moral obligation. “He raised me like his own” is sympathetically received but does not create a legal dependency claim on its own.
• Six-month limitation. The application must typically be brought within six months of the certificate of appointment of estate trustee. Miss the deadline and the application is barred absent exceptional circumstances.
• Litigation costs. A contested dependant's relief application in Ontario easily runs $30,000–$60,000 in legal fees. If Nadia wins, the court may order costs from the estate. If she loses, she bears her own costs — and she has received nothing from the estate to fund them.

Dependant's relief is a safety net, not a plan. The plan is a will.

Canada's “Inheritance Tax”: What Actually Gets Taxed at Death

Canada has no inheritance tax or estate tax at the federal or provincial level. What exists is a deemed disposition under section 70(5) of the Income Tax Act — all capital property owned by the deceased is treated as sold at fair market value on the date of death. Any resulting capital gains are taxed on the deceased's terminal T1 return.

The three tax events on Frank's estate:

1. RRSP collapse: $220,000 included as income. No spousal rollover available (Linda predeceased). Full amount taxable at marginal rates.
2. Principal residence: $0 tax. PRE shelters the entire gain. One property per family unit per year — Frank's townhouse qualifies.
3. Non-registered investments: deemed disposition at FMV. Capital gain taxed at the 50% inclusion rate (first $250K tier). The 66.67% (two-thirds) inclusion rate on gains above $250,000 per year applies only if the individual's total capital gains in the year of death exceed $250,000 — Frank's $40,000 gain is well within the first tier.

Provincial probate fees (Ontario calls them estate administration tax) add a layer that functions like a tax on death. At 1.5% above $50,000, Ontario has one of the highest probate rates in Canada. Compare:

Had Frank lived in Alberta instead of Ontario, probate on the same $700,000 estate would have been $525 instead of $9,750 — a $9,225 difference for choosing a different mailing address. Province of residence at death is a lever most people never think about.

What Frank Should Have Done: The Blended-Family Estate Checklist

The fix for Frank's situation was not complicated. It required a will, two beneficiary-designation updates, and possibly a conversation about adoption. Total cost: $1,500–$3,000 in legal fees. Here is the checklist for any step-parent in Ontario:

1. Write a will that explicitly names the step-child. Do not rely on intestacy. Do not assume the step-child is “covered” by the family relationship. The SLRA does not recognize it. Name the step-child by full legal name and relationship (“my step-daughter, Nadia [Last Name]”).
2. Update every beneficiary designation. RRSP, TFSA, RRIF, life insurance — pull every form from every financial institution and confirm the named beneficiary matches the will. If the step-child should receive the RRSP, name them directly on the designation form. Do not write “my children” — the financial institution may interpret that as biological children only.
3. Consider adoption. Legal adoption makes the step-child a “child” under the SLRA with full intestate rights. This is the most definitive solution but requires consent of both biological parents. For an adult step-child (18+), Ontario allows adult adoption — but the biological parent must consent unless the court dispenses with consent.
4. Consider life insurance payable to the step-child. A term or permanent life insurance policy with the step-child as irrevocable beneficiary bypasses the estate entirely — no probate, no will contest, no intestacy risk. The proceeds are paid directly and are tax-free to the beneficiary.
5. Review the RRSP beneficiary tax consequence. Naming the step-child as RRSP beneficiary means the step-child receives the cash but the estate pays the income tax. If the estate does not have enough liquid assets to cover the RRSP tax bill after the RRSP proceeds leave the estate, the estate may need to sell the home to pay the tax — which delays distribution and increases costs. Coordinate the will and the designation so the tax obligation is funded.

The Spousal Rollover: Why This Problem Only Exists When the Spouse Predeceases

If Linda had survived Frank, the RRSP and the home would have rolled to Linda tax-deferred under the spousal rollover provisions (section 70(6) and 146(8.1) of the Income Tax Act). No deemed disposition. No RRSP collapse. No immediate tax bill. The estate would have been distributed according to the will or intestacy — with the surviving spouse receiving the preferential share (first $350,000 in Ontario under the SLRA, plus an equal share of the remainder if there are children).

The problem crystallized because Linda died first. Without a surviving spouse, the RRSP collapses into income, the deemed disposition is triggered, and the estate shrinks by six figures before anyone inherits. This is the “second death” tax hit — and it is especially dangerous in blended families where the will may never have been updated after the first spouse's death.

The Bottom Line

An unadopted step-child in Ontario inherits nothing under intestacy. The Succession Law Reform Act does not recognize step-children as “children” for distribution purposes. On a $700,000 estate, that means the difference between inheriting nearly $490,000 (with a will and proper beneficiary designations) and inheriting $0 (without a will) is a $1,500 legal document that Frank never signed.

The RRSP beneficiary designation adds a second layer of risk. Even with a will, a stale or misworded RRSP designation can divert $220,000 to the wrong person. In blended families, every beneficiary designation form must be reviewed alongside the will — not as an afterthought, but as the first check.

Dependant's relief exists as a legal backstop, but it is expensive, uncertain, and emotionally devastating for a family that thought they were taken care of. The fix is a will and two designation forms. The cost of not doing it is the entire inheritance.

For the full breakdown of how Canada taxes estates at death — including the deemed disposition, RRSP/RRIF collapse, and probate by province — see our inheritance tax guide. For Ontario-specific probate strategies, start with our probate avoidance guide.