Change a Child Support Order in Ontario Under the 2025 Tables

Can You Change an Existing Child Support Order in Ontario Under the 2025 Tables?

Yes. An existing child support amount in Ontario may be changed if the updated tables or other circumstances support a variation. However, the 2025 Federal Child Support Tables do not automatically change an existing order. The correct process depends on the current order or agreement, financial information, and whether the parents agree.

What Changed Under the 2025 Federal Child Support Tables?

The 2025 Federal Child Support Tables came into effect on October 1, 2025. They replaced the 2017 tables for child support amounts payable from that date forward. The updated tables reflect more recent federal and provincial or territorial tax rules used to calculate basic table support amounts.

For Ontario parents reviewing an existing child support obligation, the effective date matters.

Generally:

• The 2017 tables apply when calculating table support for a period from November 22, 2017 through September 30, 2025.
• The 2025 tables apply when calculating table support from October 1, 2025 onward.

This distinction becomes especially important when parents are reviewing several years of support, seeking retroactive adjustments, or calculating whether arrears arose during different periods.

A parent should not simply take today’s income and 2025 table amount and assume that figure applies to every previous year.

Does the 2025 Child Support Table Automatically Change an Existing Order?

No. The introduction of the 2025 tables does not automatically rewrite a child support order made before October 1, 2025.

Justice Canada specifically explains that the updated table amounts do not automatically apply to an earlier child support order. However, if the amount produced under the updated tables differs from the amount in the existing order, that difference could constitute a change in circumstances that allows either parent to seek a variation.

That distinction is important.

Suppose an Ontario parent has an existing order requiring a particular monthly payment. A current calculation using the parent’s appropriate income and the 2025 table may produce a different figure.

The new calculation does not, by itself, replace the amount in the order.

Instead, the parent should determine whether there are grounds to change support and then use the appropriate legal or administrative process to make the new obligation effective.

A paying parent should therefore not simply reduce payments because a calculator produces a lower figure. Likewise, a receiving parent should not assume that a higher current table amount is automatically owing without considering the existing order and the appropriate variation process.

Existing Order vs. Updated Child Support Calculation

This creates three separate questions for a parent who wants to change a child support order in Ontario:

1. Calculation: What would the child support amount be using the appropriate table and income information?
2. Grounds for variation: Is there a change in circumstances that supports changing the existing obligation?
3. Legal change: What must be done to make the new amount legally effective?

The three questions should not be treated as interchangeable.

A table calculation tells parents what the Guidelines may produce based on specified information. It does not necessarily establish that the existing order has already changed.

When Can an Existing Child Support Order Be Changed in Ontario?

An Ontario parent may seek to vary an existing child support order when there has been a legally relevant change in circumstances.

Where an order includes a table-based child support determination, the Federal Child Support Guidelines recognize a change that would result in a different child support order as a circumstance that may give rise to a variation. Ontario’s Child Support Guidelines contain a corresponding variation rule.

Depending on the case, a review of support may be appropriate because of:

• the revised 2025 table amount;
• an increase or decrease in the payor’s income;
• new or corrected financial information;
• a significant change in parenting arrangements;
• a change in the number of dependent children;
• a child’s changing dependency or circumstances;
• changes to Section 7 special or extraordinary expenses; or
• circumstances affecting support in a shared parenting arrangement.

The applicable issue is not merely whether something has changed. The parent must determine whether the change affects the child support obligation and what process is required to vary it.

Is a Different Amount Under the 2025 Tables Enough to Request a Change?

Potentially, yes.

Justice Canada states that if the updated 2025 table amount differs from the amount contained in an existing order, that difference could be considered a change in circumstances allowing either the paying or receiving parent to apply for a variation.

This means the 2025 update can matter to parents whose support orders were made under the previous tables.

It does not mean every older order must be changed.

For example, a parent may discover that applying the 2025 table to the relevant current income produces a different monthly amount. That finding is an important first step, but other factors may still require review.

These can include:

• how income should properly be determined;
• the terms of the existing order;
• whether parenting arrangements have changed;
• whether Section 7 expenses are being paid;
• whether support is being sought for an earlier period; and
• whether both parents agree to the proposed change.

The result of a support calculator is therefore evidence of what an updated table calculation may look like. It is not automatically a new enforceable obligation.

Can Child Support Increase or Decrease After Income Changes?

Yes. A genuine change in income can result in a different child support amount, depending on the applicable Guidelines and the facts.

A receiving parent may seek an increase where the payor’s income has risen and the current support amount no longer reflects the appropriate Guidelines amount.

A paying parent may seek a reduction where income has genuinely decreased and reliable financial disclosure supports the change.

However, a reduction in income should not be treated as permission to unilaterally reduce payments under an existing order.

Determining income for child support can also be more complicated than reading one number from the latest tax return. The Federal Child Support Guidelines contain specific rules for determining income, and additional analysis may be needed for self-employment, corporate income, fluctuating earnings, or other unusual income situations.

Current and complete financial disclosure is therefore central to a child support variation.

What Other Changes Can Affect an Existing Child Support Order?

The 2025 tables are only one possible reason to review support.

Changes in Parenting Arrangements

A substantial change in parenting time may affect how support is determined.

Under the Federal Child Support Guidelines, shared parenting time applies for section 9 purposes where each parent exercises at least 40% of parenting time with a child over the course of a year. In that situation, support is not determined solely by applying one parent’s basic table amount. The Guidelines require consideration of both table amounts, the increased costs of shared parenting, and the circumstances of the parents and child.

A change into or out of a shared parenting arrangement may therefore justify reviewing an existing support obligation.

Changes in a Child’s Circumstances

Support may also require review when a child’s circumstances change.

Examples can include:

• a child becoming financially independent;
• an adult child continuing to qualify for support because of their circumstances;
• a change in living arrangements; or
• changes affecting the child’s financial needs.

Reaching the age of majority does not necessarily mean child support automatically ends. The applicable facts and legal requirements must be considered.

Changes to Section 7 Expenses

An existing support arrangement may include special or extraordinary expenses under section 7 in addition to the basic table amount.

Qualifying expenses can include certain childcare, health-related, educational, post-secondary, and extracurricular costs. The Guidelines require consideration of factors including whether an expense is necessary in relation to the child’s best interests and reasonable in light of the family’s financial circumstances.

If a significant Section 7 expense begins, ends, or changes, the overall child support arrangement may need to be reviewed even if the basic table amount remains similar.

A New Calculation Is Not the Same as an Enforceable Variation

Parents reviewing support under the 2025 tables should keep three stages separate:

1. Calculate the updated amount.

Determine what the appropriate Guidelines calculation produces using the correct table and relevant income information.

2. Determine whether there are grounds for a change.

Consider whether the new table amount, income change, parenting arrangement, child’s circumstances, Section 7 expenses, or another factor supports varying support.

3. Make the change legally effective.

Use the appropriate consent, administrative, or court process based on the existing order or agreement and the parents’ circumstances.

Until that final step has been properly completed, a parent should not assume an updated calculation has automatically replaced an existing enforceable child support obligation.

How Do You Change Child Support in Ontario?

Changing an existing child support obligation usually requires more than calculating a new amount. The parent should first identify the existing legal obligation, update the financial information, determine the appropriate Guidelines amount, and then use the process that applies to the case.

If a court order is already in place, Ontario generally requires the order to be formally changed rather than simply replaced by an informal arrangement. Ontario also permits certain eligible parents to update child support through its online Child Support Service without going to court.

A practical process may involve the following steps.

1. Review the Existing Order or Agreement

Start with the document that currently sets child support.

Check whether support is contained in:

• a court order;
• a separation agreement or other written domestic contract;
• a written agreement that has been filed with the court for enforcement; or
• an earlier administrative child support calculation.

The wording matters.

For example, an existing agreement may contain provisions requiring annual income disclosure or periodic adjustment of support. A court order may require a formal variation before the enforceable amount changes.

Parents should also determine whether the Family Responsibility Office (FRO) is currently enforcing the support obligation.

The goal at this stage is to answer one question: What legally requires the current amount to be paid?

2. Determine Current Income

The next step is to determine the income that should be used for child support purposes.

For a straightforward salaried employee, recent tax and employment records may provide much of the necessary information. More analysis can be required where income comes from:

• self-employment;
• a privately owned corporation;
• a partnership;
• commissions;
• bonuses;
• overtime;
• investment income;
• fluctuating annual earnings; or
• several different sources.

A parent’s most recent tax return is important, but taxable income and Guidelines income are not necessarily identical in every case.

For this reason, a parent asking to increase or decrease support should generally work from reliable and current financial information rather than an estimate.

3. Calculate Support Using the Correct Table

Once appropriate income information is available, calculate what the basic table amount would be for the relevant period.

The effective date of the 2025 tables remains critical:

• use the applicable 2017 table for periods through September 30, 2025; and
• use the 2025 table for periods beginning October 1, 2025.

This is particularly important when a parent is seeking a change that involves both past and future support.

An updated calculation can help identify whether the existing amount differs materially from the amount that would now result under the Guidelines. It still does not, by itself, replace the existing order.

4. Exchange Financial Disclosure

Parents generally need sufficient financial disclosure to determine whether support should change and by how much.

Depending on the circumstances, relevant records may include:

• personal income tax returns;
• Notices of Assessment;
• Notices of Reassessment;
• recent pay statements;
• employment income records;
• statements showing Employment Insurance, pension, or other income;
• business or professional financial statements;
• corporate financial statements;
• records of shareholder or corporate benefits;
• partnership income information; and
• other documents needed to determine actual income.

The Federal Child Support Guidelines require specified income disclosure and generally call for income tax returns and assessment or reassessment notices for the three most recent taxation years, together with additional records depending on how the person earns income.

Where the dispute involves more than income, parents may also need:

• the existing child support order;
• the existing written agreement;
• records showing parenting arrangements;
• parenting calendars;
• receipts or invoices for Section 7 expenses;
• proof of childcare expenses;
• medical or dental expense records;
• post-secondary education records; or
• evidence relevant to whether an older child remains dependent.

Incomplete disclosure can make it difficult to determine the proper amount and may complicate a contested variation.

5. Determine Whether the Parents Agree

Once both sides have sufficient information, compare:

1. the existing enforceable obligation;
2. the amount produced using the appropriate updated information; and
3. any additional issues affecting support.

The next procedure depends heavily on whether both parents agree.

Agreement may allow the matter to proceed through a consent process. If there is no agreement, the parent seeking the change may need a Motion to Change or another applicable procedure.

6. Use the Appropriate Legal or Administrative Process

Depending on the circumstances, an Ontario child support change may involve:

• a consent motion;
• an eligible administrative recalculation;
• a contested Motion to Change; or
• an appropriate amendment to a written agreement.

The correct route depends on how the existing obligation was created and the issues that need to be resolved.

Not every parent is eligible for Ontario’s administrative Child Support Service, and a parent should not assume that an online recalculation is available simply because income has changed. Ontario describes the service as an alternative to court for qualifying cases.

7. Make Sure the New Amount Is Legally Effective

This final step is easy to overlook.

A parent may have:

• a current tax return;
• an updated Guidelines calculation;
• proof that income has changed; and
• even an understanding with the other parent.

That does not necessarily mean the enforceable obligation in an existing court order has been changed.

The appropriate documentation should be completed so the new support obligation is legally recognized and, where necessary, can be reflected in FRO enforcement records.

The practical rule is simple: do not stop at the calculation. Make sure the existing legal obligation is properly changed.

If Both Parents Agree to Change Child Support

If both parents agree on the new child support amount, they may be able to use a consent process rather than litigating the issue.

For a child-support-only change to an existing court order or qualifying filed agreement, Ontario provides Form 15D: Consent Motion to Change Child Support. The form records the current arrangement and the change agreed upon by the parties. If an assignee is involved, the assignee may also need to consent.

Agreement can therefore make the process more straightforward, but parents should distinguish between agreeing on a number and legally changing an existing obligation.

For example, suppose an existing order requires $900 per month and both parents later agree that updated income and the applicable Guidelines support $975 per month.

Simply exchanging emails saying that $975 is acceptable may not, by itself, alter the court order being enforced.

The parents should determine which formal step is required to record the change.

This is especially important where:

• the existing order is registered with FRO;
• arrears already exist;
• support has previously been assigned to another agency;
• the parties disagree about the effective date;
• Section 7 expenses are also changing; or
• the written agreement contains its own amendment requirements.

A verbal agreement should not be assumed to override a court order.

Even where the relationship between the parents is cooperative, properly documenting the change can reduce future disputes about the amount, start date, arrears, or enforcement.

What Happens If the Other Parent Refuses to Change Child Support?

If the other parent does not consent, the parent seeking the change may have to bring a Motion to Change in Ontario family court.

Ontario’s procedural guidance states that a person seeking to change a final order or a written agreement already filed with the court, where the other party does not agree, generally begins the process using Form 15: Motion to Change.

The process generally includes:

1. completing the required Motion to Change documents;
2. attaching the existing order or filed written agreement being challenged;
3. providing the required financial information;
4. having the motion issued by the court;
5. serving the documents on the other party;
6. filing proof that service was completed; and
7. proceeding through the required family court steps if the dispute is not resolved.

Ontario’s child support guidance also identifies Form 13A: Certificate of Financial Disclosure among the documents used where one parent seeks a change without the other’s consent. Other financial forms or supporting documents may be required depending on the issues in the case.

The responding parent can oppose the requested change and provide their own position and evidence. Ontario uses Form 15B: Response to Motion to Change in the applicable response process.

A contested variation may involve disputes over more than the 2025 table amount.

Common disagreements include:

• what income should be used;
• whether income has genuinely decreased;
• whether income should be attributed from a corporation;
• whether financial disclosure is complete;
• when the changed amount should begin;
• whether a parenting arrangement has changed;
• whether section 9 shared-parenting rules apply;
• whether particular Section 7 expenses are reasonable;
• whether an adult child remains entitled to support;
• whether support should change retroactively; and
• how existing arrears should be treated.

A parent applying for a reduction should continue to take the existing enforceable obligation seriously while the requested change is being determined. Filing a Motion to Change does not mean a parent can simply choose a lower payment amount immediately.

Likewise, a receiving parent seeking an increase should distinguish between the higher amount being requested and the amount presently enforceable under the existing arrangement.

Where income, retroactivity, arrears, or financial disclosure is contested, speaking with a Toronto Divorce Lawyer can help a parent understand what evidence and procedure may be required.

Can Child Support Be Recalculated Without Going to Court?

Sometimes. Ontario’s Child Support Service allows eligible parents and caregivers with non-complex child support matters to establish or update support without a traditional court proceeding. It should not, however, be treated as an option available in every case.

The service may be useful where the main issue is updating child support based on current income information.

Ontario’s court-services reporting describes the online service as allowing eligible parents and caregivers to establish or update existing child support orders.

Eligibility should be checked before relying on this route.

Cases involving more complicated issues may require a different process. For example, an administrative calculation may not be appropriate where the dispute requires a court to decide issues involving:

• complex or disputed income;
• some self-employment or corporate income situations;
• shared or split parenting arrangements;
• disagreement about a child’s entitlement to support;
• disputed Section 7 expenses;
• retroactive support;
• significant arrears; or
• other facts requiring judicial findings.

The important distinction is that administrative recalculation is an available process in qualifying circumstances, not an automatic right for every Ontario parent. Ontario specifically describes the service as intended for non-complex child support cases.

Parents should therefore consider three questions before choosing this route:

1. Is the existing support arrangement eligible for administrative updating?
2. Can the support amount be determined from the financial information available without resolving a broader legal dispute?
3. Are there parenting, income, expense, retroactivity, or arrears issues that require a court decision?

If the online service is not available or appropriate, parents may need to use a consent process or bring a Motion to Change.

Frequently Asked Questions

Which child support table applies if the period crosses October 1, 2025?

Use the applicable 2017 table through September 30, 2025, and the 2025 table for support periods beginning October 1, 2025.

Can parents agree to a new child support amount without a contested court hearing?

Yes. Parents may use an appropriate consent process, but they should formally document the change rather than assume an informal agreement replaces an existing order.

What if the paying parent is self-employed and their income has changed?

Self-employment income may require business, corporate, and tax records to determine Guidelines income accurately before deciding whether child support should increase or decrease.

How long does it take to change child support in Ontario?

There is no fixed timeline. Timing depends on consent, financial disclosure, administrative eligibility, disputed issues, and whether a contested court process is required.

Do I need a lawyer to change an existing child support order?

Not always. Legal advice can be helpful where income, retroactive support, arrears, shared parenting, Section 7 expenses, or a contested variation is involved.

Change a Child Support Order