Back child support in Ontario refers to court-ordered support payments that a payor parent missed and now owes as a debt. These arrears accumulate at the full ordered amount, plus interest, until a court formally changes the order. The Family Responsibility Office (FRO), Ontario's enforcement agency under the Family Responsibility and Support Arrears Enforcement Act, 1996, s. 1, collects arrears using wage garnishment, bank seizures, federal payment interception, licence suspension, and even incarceration of up to 180 days. Courts rarely cancel back child support because arrears are treated as a debt owed for the benefit of the child.
Key Facts: Back Child Support in Ontario
| Factor | Detail |
|---|---|
| Enforcement Agency | Family Responsibility Office (FRO) |
| Governing Statute | Family Responsibility and Support Arrears Enforcement Act, 1996 |
| Federal Framework | Divorce Act, R.S.C. 1985, c. 3 (2nd Supp.) |
| Interest on Arrears | Yes — accrues on unpaid support |
| Motion to Change Fee | $224 (as of January 2026; now indexed to inflation) |
| Arrears Rescission Test | Colucci v. Colucci, 2021 SCC 24 |
| Maximum Jail for Default | 180 days |
| FRO Toll-Free Line | 1-800-267-4330 |
What Is Back Child Support in Ontario?
Back child support in Ontario is the total of all support payments a payor failed to make when they were due, and it accumulates at the full ordered amount plus interest until a court changes the order. The Family Responsibility Office enforces these arrears but cannot reduce or increase them — only a court can. If a payor misses a $909 monthly payment, that $909 becomes a legally enforceable debt immediately, and additional payments stack on top each month they go unpaid.
Arrears are distinct from the ongoing support obligation. A payor can owe both current monthly support and a separate pool of accumulated arrears at the same time. Under the Family Responsibility and Support Arrears Enforcement Act, 1996, s. 6, every support order made in Ontario is automatically filed with the FRO unless the parties opt out. Once registered, the FRO monitors payments and steps in the moment a payor falls behind. Recipients do not need to chase the payor themselves; the enforcement machinery activates automatically. This makes Ontario one of the most aggressive child support enforcement jurisdictions in North America, with arrears tracked to the dollar across decades.
How Do Child Support Arrears Accumulate in Ontario?
Child support arrears in Ontario accumulate immediately and automatically the moment a scheduled payment is missed, with no grace period required before the debt becomes enforceable. Each missed payment adds to the running total, and interest accrues on the outstanding balance. A payor who skips $1,000 per month accumulates $12,000 in arrears within a single year, before interest is applied.
Unpaid support does not disappear over time the way some other debts can. There is no general limitation period that wipes out child support arrears in Ontario, because the obligation is owed for the benefit of the child rather than the recipient parent. In the Supreme Court of Canada case Colucci v. Colucci, 2021 SCC 24, the father made no voluntary payments from 1998 to 2016 and accumulated over $170,000 in arrears — and the Court still refused to cancel the debt. Arrears continue to grow until one of two things happens: the payor pays the balance in full, or a court formally varies the underlying order. Simply earning less money or losing a job does not reduce the arrears automatically. The payor must take active legal steps, and the burden of proof rests entirely on them to justify any reduction.
What Powers Does the Family Responsibility Office Have?
The Family Responsibility Office has broad enforcement powers that escalate as arrears grow, including wage garnishment, bank account seizure, federal payment interception, credit reporting, driver's licence suspension, passport restrictions, and incarceration of up to 180 days. The FRO sends a garnishment notice directly to the payor's employer, and support is deducted from the paycheque before the payor ever receives it.
The FRO's authority is granted under the Family Responsibility and Support Arrears Enforcement Act, 1996, s. 41. Beyond wage garnishment, the office can seize funds in bank accounts, intercept income tax refunds, GST/HST credits, and certain other federal payments. The FRO can register a writ against the payor's real estate or other property, meaning any sale or refinancing requires the arrears to be paid first. The agency can also suspend the payor's driver's licence — first issuing a warning notice, then proceeding with suspension if the arrears remain unresolved. In serious cases, the FRO can bring the payor before a court for a default hearing, where a judge may order incarceration for up to 180 days, though the payor may be released earlier if the arrears are paid. A 2026 Ontario case demonstrated this severity: a court ordered a father who had avoided payment for nearly a decade to pay $77,784 in arrears, plus $909 per month going forward, plus $9,000 in legal costs.
How Do I File for Back Child Support Through the FRO?
To claim back child support through the FRO, the recipient completes a Statement of Arrears form, which tells the office about any support payments, special expenses, or court costs that went unpaid before the case was registered or that became owed during the life of the case. Once submitted, the FRO calculates the total arrears and begins enforcement against the payor.
The FRO's first step is usually cooperative rather than punitive. When a payor falls behind, the office attempts to work with them to develop a payment plan covering the arrears while maintaining ongoing support. If the payor refuses to set up a plan or fails to honour it, the FRO escalates to enforcement tools. Recipients should keep detailed records of every missed payment, including dates and amounts, because accurate documentation speeds up the arrears calculation. For support orders not yet registered with the FRO, the recipient can file the order with the office to activate enforcement. The FRO contact points are the toll-free line 1-800-267-4330, the Toronto line 416-326-1817, the online portal at ontario.ca/FROonline, and the mailing address: Family Responsibility Office, Ministry of Children, Community and Social Services, PO Box 200, Station A, Oshawa, Ontario L1H 0C5. Filing is free, and the FRO does not charge recipients for collection services.
Can Back Child Support Be Cancelled or Reduced in Ontario?
Back child support can be cancelled or reduced in Ontario only in rare circumstances, because Ontario courts apply a presumption against rescinding arrears that the payor must overcome with compelling evidence of a genuine, ongoing inability to pay. The leading authority, Colucci v. Colucci, 2021 SCC 24, confirms that arrears reflecting correctly ordered amounts are treated as a child's debt that courts are reluctant to forgive.
The Supreme Court of Canada in Colucci v. Colucci established that where arrears reflect the amount that should have been paid, there is a presumption against rescinding any part of those arrears, and the payor bears the burden of rebutting that presumption (Colucci, para. 138). The Court distinguished three categories of retroactive variation: a retroactive decrease of support, a retroactive increase of support, and a rescission of arrears. To succeed on rescission based on present hardship, the payor must provide full financial disclosure proving they are, and will continue to be, unable to pay the arrears. In Colucci, the father's failure to provide sufficient income documentation was fatal to his claim — the Court denied all relief. Even where some relief is granted, courts more often impose temporary measures like reduced installment amounts or structured payment schedules rather than wiping out the debt entirely. The federal framework for these applications appears in the Divorce Act, R.S.C. 1985, c. 3, s. 17.
How Do I Change a Child Support Order in Ontario?
To change a child support order in Ontario, the parent files a Motion to Change (Form 15) with the court, paying a filing fee of $224 as of January 2026, along with a financial statement (Form 13 or Form 13.1). The motion asks the court to adjust support going forward and, in some cases, retroactively, but it does not automatically erase existing arrears.
The Motion to Change process requires the moving party to demonstrate a material change in circumstances since the original order — for example, a significant change in income, a change in parenting arrangements, or a child reaching the age of majority. Two paths exist depending on cooperation. If both parents agree, they can file a Consent Motion to Change without a court appearance, which is faster and cheaper. If the other parent objects, a contested Motion to Change is necessary, and the matter proceeds through the court process. Beginning January 1, 2026, and every third January 1 afterward, Ontario court fees are indexed to inflation under O. Reg. 417/95, so the $224 figure may rise. Recipients of Ontario Works or the Ontario Disability Support Program (ODSP) qualify for a fee waiver that eliminates the cost. Ontario also offers an Online Child Support Service that allows parents to update support amounts without going to court in straightforward cases. As of January 2026, verify the exact current fee with your local clerk.
What Is the Difference Between Retroactive Support and Arrears?
Retroactive child support and arrears are legally distinct in Ontario: retroactive support is a new obligation a court imposes for a past period when support was under-paid or never ordered, while arrears are unpaid amounts under an existing order. Retroactive claims require proving the correct amount that should have been paid; arrears already reflect a fixed, court-ordered debt.
The distinction matters because the legal tests differ. For a retroactive increase, the Supreme Court of Canada in Colucci v. Colucci, 2021 SCC 24 confirmed that support is generally adjusted back to the date of formal notice if no effective notice was given earlier. Courts apply the D.B.S. v. S.R.G., 2006 SCC 37 factors: the reason for the payor's delay, the payor's conduct, the child's circumstances, and the hardship to the payor compared to the hardship to the child and recipient. A retroactive claim might apply, for example, where a payor's income rose substantially but they continued paying the lower table amount, leaving the child short. Arrears, by contrast, arise when the payor simply failed to pay what an existing order already required. Both can be enforced by the FRO, but the recipient must establish the correct figure for a retroactive claim, whereas arrears are calculated mechanically from the existing order.
How Does Interest Work on Past Due Child Support?
Interest accrues on past due child support in Ontario, increasing the total child support debt beyond the principal arrears amount, and the FRO can collect both principal and accumulated interest through its full range of enforcement tools. Interest compounds the cost of falling behind, so a payor who delays for years can owe substantially more than the original missed payments.
The accrual of interest reinforces why doing nothing is the most costly response to a missed payment. A payor who owes $50,000 in principal arrears may face thousands of additional dollars in interest by the time enforcement concludes. The FRO tracks both components and pursues the full balance. Recipients are entitled to recover this interest because the arrears — including interest — represent money owed for the benefit of the child. Payors who anticipate trouble paying should act immediately rather than allowing interest to compound. The most common and damaging mistake payors make is ignoring an FRO notice after losing a job or taking a pay cut. Responding quickly, requesting a payment plan, and filing a Motion to Change where circumstances genuinely justify it can limit the growth of both arrears and interest. Silence only accelerates the debt and invites escalating enforcement.
FAQs: Back Child Support in Ontario
How long can you go without paying child support in Ontario before facing enforcement?
There is no grace period. Arrears begin accumulating immediately when a payment is missed, and the FRO can act as soon as the payor falls behind. The FRO typically first attempts a payment plan, then escalates to wage garnishment, bank seizure, licence suspension, or a default hearing carrying up to 180 days incarceration.
Can child support arrears be forgiven in Ontario?
Rarely. Under Colucci v. Colucci, 2021 SCC 24, there is a presumption against rescinding arrears, and the payor bears the burden of proving a genuine, ongoing inability to pay through full financial disclosure. Courts more often grant reduced installments or payment schedules rather than cancelling the debt, which is treated as money owed for the child's benefit.
What happens if I ignore the Family Responsibility Office?
Ignoring the FRO accelerates enforcement. The office can garnish wages, seize bank accounts, intercept tax refunds and federal payments, suspend your driver's licence, restrict your passport, report you to credit bureaus, and bring you before a court for a default hearing that can result in up to 180 days of incarceration. Responding quickly to any FRO notice is critical.
How much does it cost to change a child support order in Ontario?
The filing fee for a Motion to Change (Form 15) is $224 as of January 2026, though Ontario court fees are now indexed to inflation under O. Reg. 417/95 starting January 1, 2026. Recipients of Ontario Works or ODSP qualify for a full fee waiver. Verify the exact current amount with your local court clerk before filing.
Does back child support go away when the child turns 18?
No. Arrears that accumulated while the child was eligible remain a legally enforceable debt even after the child reaches adulthood. In Colucci v. Colucci, 2021 SCC 24, the father's support obligation ended in 2012, yet the Court still enforced the more than $170,000 in arrears he had accumulated. The FRO can continue collecting arrears indefinitely.
Can the FRO take my driver's licence for unpaid child support?
Yes. Under the Family Responsibility and Support Arrears Enforcement Act, 1996, the FRO can suspend a payor's driver's licence for unpaid support. The process begins with a warning notice, and if the arrears remain unresolved, the suspension proceeds. Setting up a payment plan or paying the arrears can stop or reverse the suspension.
What is the Statement of Arrears form?
The Statement of Arrears is the form a recipient files with the FRO to report support payments, special expenses, or court-ordered costs that went unpaid before the case was registered or became owed during the case. It allows the FRO to calculate the total arrears accurately and begin enforcement. Keeping detailed records of missed payments speeds up this process.
Can I collect back child support if there was no court order?
You generally need an order or a support agreement filed with the court to enforce arrears through the FRO. If no order exists, you can apply to the court for child support, including a retroactive claim for a past period under the D.B.S. v. S.R.G., 2006 SCC 37 factors. Once an order is made and filed, the FRO can enforce any arrears that arise.
Does interest accrue on unpaid child support in Ontario?
Yes. Interest accrues on past due child support in Ontario, and the FRO collects both the principal arrears and accumulated interest. A payor who delays for years can owe significantly more than the original missed payments. Recipients are entitled to recover this interest because the arrears represent a debt owed for the benefit of the child.
How do I contact the Family Responsibility Office?
The FRO can be reached at its toll-free line 1-800-267-4330, the Toronto line 416-326-1817, and online at ontario.ca/FROonline. The mailing address is Family Responsibility Office, Ministry of Children, Community and Social Services, PO Box 200, Station A, Oshawa, Ontario L1H 0C5. The FRO does not charge recipients for enforcement services.
This guide is for general information about back child support in Ontario and does not constitute legal advice. Child support arrears, retroactive claims, and motions to change involve complex facts and evolving case law. Consult a licensed Ontario family lawyer about your specific circumstances. Filing fees and procedures are current as of January 2026; verify with your local court clerk and the FRO.