Filing taxes during divorce in Ontario requires updating your CRA marital status to "separated" once you have lived apart for 90 consecutive days, reported by the end of the month after that 90-day mark. Spousal support is tax-deductible for the payer and taxable for the recipient; child support paid under post-April-1997 orders is neither deductible nor taxable.
Key Facts: Filing Taxes During Divorce in Ontario
| Item | Detail |
|---|---|
| Court Filing Fee (divorce) | $669 total ($224 application + $445 affidavit), plus $25 certificate. As of June 2026. Verify with your local clerk. |
| CRA Status Change Deadline | End of the month following the 90-day separation mark (Form RC65) |
| Separation Threshold for Tax | 90 consecutive days living apart due to relationship breakdown |
| Spousal Support Tax Treatment | Deductible to payer (Line 21999/22000); taxable to recipient |
| Child Support Tax Treatment | Not deductible, not taxable (post-April 1997 orders) |
| Eligible Dependant Credit (Line 30400) | $16,129 federal amount for 2025; indexed higher for 2026 |
| Residency Requirement | One spouse must reside in Ontario for 12 months before filing |
| Property Division Type | Equalization of net family property (not 50/50 asset split) |
| Governing Tax Authority | Canada Revenue Agency (CRA) under the federal Income Tax Act |
When Must You Change Your Tax Filing Status During Divorce in Ontario?
You must change your CRA marital status to "separated" after living apart from your spouse for 90 consecutive days because of a relationship breakdown, and you must report this change by the end of the month following the 90-day mark. The effective separation date is the first day of that 90-day period, not the 90th day.
The Canada Revenue Agency uses four marital status categories that affect your tax filing status divorce situation: married, separated, divorced, and single. "Separated" applies once the 90-day threshold is met. "Divorced" applies only after a court issues your Divorce Order under the Divorce Act § 12. Until that order is granted, you remain legally married even if you have lived apart for years. An involuntary separation — where a spouse lives away for work, school, health reasons, or incarceration — does not trigger a status change, because the relationship has not broken down.
Updating your status matters beyond the tax return itself. The CRA recalculates benefits such as the Canada Child Benefit and the GST/HST credit based on your individual income rather than combined household income, often increasing payments for the lower-earning spouse. Use Form RC65, Marital Status Change, or update online through your CRA My Account. Do not wait for filing season to report the change.
How Is Spousal Support Taxed When Filing Taxes During Divorce in Ontario?
Spousal support is fully tax-deductible for the payer and must be reported as taxable income by the recipient, provided the payments are made under a written separation agreement or court order. The payer claims the deduction on Line 21999 and Line 22000 of the T1 return, while the recipient reports the income on Line 12799/12800.
Under the federal Income Tax Act and CRA Guide P102, periodic spousal support payments shift the tax burden from the higher-income payer to the lower-income recipient, who is usually taxed at a lower marginal rate. This creates a tax-planning advantage worth thousands of dollars annually for many couples. However, three conditions must be met. First, a formal written agreement or court order is required — verbal or informal arrangements are not deductible. Second, child support obligations must be fully current; if you are behind on child support, the CRA disallows the spousal support deduction until arrears are paid. Third, the order or agreement must clearly identify which portion is spousal support versus child support, or the entire amount loses its deductible character.
Lump-sum spousal support payments are generally not deductible, because deductibility requires periodic, recurring payments on a fixed schedule. Couples structuring settlements under the Family Law Act § 33 should document the support schedule precisely to preserve the deduction.
How Is Child Support Taxed When Filing Taxes During Divorce in Ontario?
Child support paid under any court order or written agreement made after April 30, 1997, is not tax-deductible for the payer and is not taxable income for the recipient. This rule, established under the Income Tax Act, treats child support as a tax-neutral transfer because the funds are intended for the children's benefit, not for income redistribution between spouses.
The post-1997 framework reversed the older system where child support was deductible and taxable. For agreements predating May 1, 1997, the old inclusion/deduction rules may still apply unless the parties elected to switch. When an agreement requires both spousal and child support, the CRA applies payments to child support first. This ordering rule means that if a payer falls behind, the shortfall is deemed to reduce the deductible spousal support — not the child support — eliminating the payer's deduction until child support is brought current.
For parents managing parenting arrangements and decision-making responsibility under the Divorce Act § 16.1, the practical consequence is that child support amounts calculated under the Federal Child Support Guidelines carry no direct tax line item. The amount is set by the payer's income and the number of children, with no adjustment for the payer's tax position. Parents should budget child support as a fixed, after-tax obligation.
Who Claims the Children When Filing Taxes During Divorce in Ontario?
The amount for an eligible dependant (Line 30400) — worth a federal base of $16,129 for the 2025 tax year and indexed higher for 2026 — can be claimed by one parent for one child after separation. In shared parenting arrangements where both parents pay support to each other, the parents may agree on who claims the credit; if they cannot agree, neither parent receives it.
This credit, historically called the "equivalent to spouse" amount, functions like the head of household divorce concept used in the United States, giving a single parent a credit comparable to the spousal amount. Claiming dependants divorce rules in Canada hinge on the support structure. Where only one parent has a legal obligation to pay child support — for example, when a settlement is paid as a net "set-off" amount from the higher earner — only the parent who does not pay support can claim the eligible dependant credit. To preserve flexibility, separation agreements should require both parents to pay gross support to each other, even if a netting payment is made for convenience.
With two children in equal shared parenting, each parent can claim one child as an eligible dependant. With one child, parents typically alternate the claim year to year. The credit cannot be claimed by a parent who is remarried, has a new common-law partner, or is claiming the spousal amount.
How Does Divorce Affect the Canada Child Benefit in Ontario?
In a shared parenting arrangement where each parent has the child between 40% and 60% of the time, the Canada Child Benefit is split so each parent receives 50% of the amount they would individually qualify for based on their own income — not a simple halving of one combined payment. For July 2025 to June 2026, the maximum CCB is $7,997 per year per child under 6 and $6,748 per year per child aged 6 to 17.
The CRA calculates each parent's full entitlement using that parent's Adjusted Family Net Income, then pays each parent half of their individual calculated amount. A lower-income parent therefore receives 50% of a larger benefit, while a higher-income parent receives 50% of a smaller one. Both parents must apply for shared-custody status; failing to do so risks an overpayment notice and repayment demand if the CRA later audits the parenting schedule. If a child lives with one parent more than 60% of the time, that parent is treated as having full custody and receives the entire benefit.
The maximum under-6 amount rises to $8,157 per year beginning with the July 2026 payment for the 2026–2027 benefit year. Families earning under $37,487 in AFNI receive the full benefit; amounts phase out above that threshold. Report custody and income changes promptly to avoid clawbacks.
Are Legal Fees Tax-Deductible When Filing Taxes During Divorce in Ontario?
Legal fees are tax-deductible for the recipient of support — but not the payer — when incurred to establish, increase, or collect spousal or child support, or to make child support non-taxable. Fees for the divorce itself, property division, or parenting arrangements are not deductible. Recipients claim the deduction on Line 23200 of the T1 return.
Under CRA Income Tax Folio S1-F3-C3, a support recipient may deduct legal fees paid to establish the right to support, defend against a reduction in support, collect overdue support, or obtain a ruling that child support is non-taxable. The payer of support cannot deduct any legal fees, because the CRA classifies them as a personal living expense not incurred to earn income. This asymmetry means the spouse seeking support gains a tax advantage on legal costs that the paying spouse does not.
The deduction must be reduced by any costs award or reimbursement the recipient receives. Where a single retainer covers divorce, property, parenting, and support work simultaneously, the recipient needs an itemized invoice separating the support-related portion, because only that portion is deductible. Keep detailed billing records, as the CRA may request documentation to verify the claim. Quebec uses similar rules but, unlike the rest of Canada, also permits payers to deduct support-establishment legal fees.
What Are the Filing Fees and Residency Requirements for Divorce in Ontario?
The total mandatory court filing fee for a divorce in Ontario is $669, paid in two installments — $224 when the Application for Divorce (Form 8A) is issued and $445 when the Affidavit for Divorce (Form 36) is filed — plus a $25 fee for the Certificate of Divorce. To file, at least one spouse must have resided in Ontario for 12 months immediately before the application.
These fees are set under Ontario Regulation 293/92 made under the Administration of Justice Act and apply whether you file on paper or through the online Court Services portal. A $10 federal Central Registry levy is included in the first installment and cannot be waived. The 12-month residency requirement comes from the Divorce Act § 3, which gives the Ontario Superior Court of Justice jurisdiction once either spouse has been ordinarily resident in the province for one full year. As of June 2026, verify exact amounts with your local clerk, because Ontario adjusts these fees triennially based on the Consumer Price Index.
Low-income applicants receiving Ontario Works or ODSP, or meeting income thresholds, may apply for a Fee Waiver that eliminates the $669 court fee (though not the $10 federal levy). Property division in Ontario follows equalization of net family property under the Family Law Act § 5, where the spouse with the higher net worth growth during marriage pays the other half the difference, rather than splitting individual assets.
What Tax Mistakes Should You Avoid When Filing Taxes During Divorce in Ontario?
The most costly mistake is failing to update your CRA marital status within 30 days of the month after the 90-day separation mark, which can trigger benefit overpayments that must be repaid with interest. The second most common error is claiming a spousal support deduction without a written agreement, which the CRA will disallow on audit.
Many separating couples mistakenly believe they should file taxes jointly — but Canada has no joint filing or married filing separately divorce equivalent. Every Canadian files an individual return regardless of marital status, though the CRA still requires you to report your spouse's net income while married, because it affects credits like the GST/HST credit. A third frequent error involves the eligible dependant credit: when both parents pay only a net set-off amount, only one parent qualifies, and disputes over who claims the credit can disqualify both. A fourth mistake is deducting lump-sum spousal support, which is not deductible because deductibility requires periodic payments.
Other pitfalls include forgetting to split RRSP and pension assets on a tax-deferred basis under a written agreement, missing the principal residence exemption rules when transferring the matrimonial home, and failing to deduct eligible support-collection legal fees. When in doubt, consult a CPA who specializes in separation and divorce taxation before filing.