How to Modify Child Support in New Brunswick: Complete 2026 Guide

Modifying child support in New Brunswick requires filing a variation application with the Court of King's Bench, Family Division, at a cost of $100 as of March 2026. Under Divorce Act, R.S.C. 1985, c. 3, s. 17(4), you must demonstrate a material change in circumstances since the original order or last variation. Common qualifying changes include income increases or decreases exceeding 10%, job loss, relocation, changes in parenting time arrangements, or a child reaching the age of majority. New Brunswick also offers the Child Support Recalculation Service (CSRS), which automatically recalculates support annually without requiring a court appearance for families where both parents earn under $150,000.

Key Facts: New Brunswick Child Support Modification

What Qualifies as a Material Change in Circumstances

A material change in circumstances under the Federal Child Support Guidelines includes any change that would result in a different child support order than the one currently in place. Under Divorce Act, R.S.C. 1985, c. 3, s. 17(4), the court must satisfy itself that such a change has occurred before varying any child support order. Qualifying changes include income fluctuations of 10% or more, involuntary job loss, promotion or career advancement, disability or illness affecting earning capacity, changes in the number of children requiring support, and changes to parenting time arrangements exceeding 40% threshold.

The Federal Child Support Guidelines, amended most recently on October 1, 2025, specifically define what constitutes a change of circumstances. Where the child support order includes a table amount determination, any change that would produce a different table amount qualifies. For orders made before May 1, 1997, the implementation of the Guidelines themselves constitutes sufficient grounds for variation. New Brunswick courts have consistently ruled since November 2000 that updated Guidelines tables justify variation applications.

Income-Based Changes That Justify Modification

Income changes represent the most common basis for child support modification in New Brunswick. The payor's gross annual income determines the table amount under the Federal Child Support Guidelines, with tables updated on October 1, 2025, to reflect 2023 tax rules. A significant income change affecting either parent may warrant modification. If the payor's income decreases due to job loss, reduced hours, or career change, the table amount decreases proportionally. Conversely, if the payor receives a promotion, bonus, or new employment with higher compensation, the recipient parent may seek an increase.

Courts distinguish between voluntary and involuntary income changes. Under Federal Child Support Guidelines, s. 19(1)(a), the court may impute income to a parent who is intentionally underemployed or unemployed. The test considers the parent's age, education, health, work history, and job market conditions. A parent who voluntarily quits a high-paying job without reasonable justification may have income imputed at their previous earning level. However, imputation does not apply where underemployment results from caring for a child, pursuing reasonable education, or managing health conditions.

Changes in Parenting Time Arrangements

Parenting time arrangements directly affect child support calculations in New Brunswick. When parenting time changes from a primary arrangement to shared parenting time (40% or more with each parent), the calculation method shifts under Federal Child Support Guidelines, s. 9. In shared parenting arrangements, both parents' incomes determine the support amount using a set-off calculation. The parent with the higher table amount pays the difference to the other parent, recognizing that both households incur child-related expenses.

For example, if a payor earning $80,000 annually previously paid $766 monthly for one child under sole parenting arrangements, and parenting time changes to 50-50, the recipient parent's income of $50,000 generates a table amount of $456. The payor would then pay only the set-off amount of $310 monthly ($766 minus $456). This represents a reduction of $5,472 annually. Courts require clear documentation of actual parenting time, typically through detailed parenting schedules or calendars spanning at least 12 months.

How to File a Child Support Variation Application

Filing a child support modification in New Brunswick involves preparing and submitting a variation application to the Court of King's Bench, Family Division. The process costs $100 as of March 2026, with fee waivers available under Rules of Court, Rule 72.24(2) for applicants receiving social assistance or experiencing financial hardship. The application must include a completed Form 72A (Variation Application), current financial disclosure forms, the original child support order, and supporting documentation proving the change in circumstances.

Required Documentation Checklist

Preparing your variation application requires comprehensive documentation to demonstrate the material change in circumstances. The court requires the following materials:

• Completed Form 72A (Variation Application)
• Original child support order being varied
• Sworn Financial Statement (Form 72J)
• Last three years of income tax returns with all schedules
• Last three years of Notices of Assessment from Canada Revenue Agency
• Most recent pay stubs covering at least three months
• Employment verification letter stating salary, position, and start date
• Documentation proving the change (termination letter, medical reports, new employment contract)
• Proposed parenting schedule if parenting time has changed
• Child-related expense receipts for special or extraordinary expenses

Step-by-Step Filing Process

The variation application process in New Brunswick follows these sequential steps. First, gather all required documentation and complete Form 72A with the specific variation requested. Second, file the application with the Court of King's Bench, Family Division in your judicial district, paying the $100 filing fee. Third, serve a copy on the other parent through personal service or an alternative method approved by the court. Fourth, wait for the other parent to file a response within 30 days. Fifth, attend case management conference if required. Sixth, proceed to hearing if the matter remains contested.

For uncontested variations where both parents agree to the change, the court may approve the modification without a full hearing. Submit a consent variation order signed by both parties along with supporting financial documentation. The court reviews the proposed amount against the Guidelines tables to ensure compliance with federal requirements. Processing time for uncontested variations typically ranges from 4 to 8 weeks, while contested matters may take 6 to 12 months depending on court scheduling.

Using the New Brunswick Child Support Recalculation Service

The New Brunswick Child Support Recalculation Service (CSRS) provides an administrative alternative to court-based variation for eligible families. This service automatically recalculates child support annually on the anniversary date of your order using updated income information, without requiring a court appearance. To qualify, both parents must reside in New Brunswick, neither parent can earn more than $150,000 gross annually, and the existing order must have been in place for at least one year (or 120 days before the one-year anniversary for new applicants).

The CSRS process begins with online enrollment at gnb.ca/csrs. After confirming eligibility, the service sends a Notice of Enrollment to both parents. Annually, each parent must provide income verification, typically through tax returns and Notices of Assessment. The service calculates the updated support amount using current Federal Child Support Guidelines tables. If the recalculated amount differs by more than $5 monthly from the existing order, a new amount takes effect unless either parent objects within 30 days. Objections proceed to court for judicial determination.

Eligibility Requirements for Recalculation Service

The CSRS has specific eligibility criteria that exclude certain families. You cannot use the service if: either parent lives outside New Brunswick; either parent earns over $150,000 gross annually; you seek to address arrears rather than prospective support; the order involves split or shared parenting arrangements requiring judicial discretion; or the support order includes special or extraordinary expenses requiring proportional sharing calculations. Families meeting these criteria must pursue traditional court-based variation under Divorce Act, s. 17.

Costs and Processing Timeline

The Child Support Recalculation Service operates at no cost to participating families, representing a significant savings compared to the $100 court filing fee plus potential legal expenses. The service contacts parents approximately 45 days before the order anniversary date to request income documentation. Recalculation occurs within 30 days of receiving complete information from both parents. If neither parent objects within 30 days of receiving the recalculated amount, the new support obligation becomes effective automatically. Contact the CSRS at 1-833-224-2225 for enrollment or inquiries.

Special and Extraordinary Expenses Modification

Special and extraordinary expenses under Federal Child Support Guidelines, s. 7 require separate modification procedures from table amount changes. These expenses include childcare costs incurred due to employment or education, medical and dental insurance premiums for the child, health-related expenses exceeding insurance coverage by $100 annually (orthodontics, prescription medications, therapy), extraordinary educational expenses, and extracurricular activities. Parents share these expenses proportionally based on their respective incomes.

To modify special expense arrangements, file a variation application identifying the specific expense changes. Common scenarios include: childcare costs increasing when a child transitions from home care to full-day care; new health expenses arising from diagnoses requiring ongoing treatment; extracurricular activities becoming competitive and significantly more expensive; or a child no longer participating in previously ordered activities. Courts require documentation showing the expense is necessary, reasonable given family means, and in the child's best interests.

Calculating Proportional Shares

Special and extraordinary expenses divide between parents based on their proportional income contribution. For example, if the payor earns $80,000 and the recipient earns $40,000, their combined income totals $120,000. The payor contributes 66.7% of combined income and therefore pays 66.7% of approved special expenses. The recipient covers the remaining 33.3%. If orthodontic treatment costs $5,000, the payor contributes $3,335 while the recipient contributes $1,665. Courts may adjust these proportions if one parent already receives tax benefits (such as the childcare expense deduction) that offset their contribution.

Retroactive Child Support Modifications

New Brunswick courts may order retroactive child support modifications under Divorce Act, R.S.C. 1985, c. 3, s. 17(1), which permits variation orders to apply "retroactively or prospectively." The Supreme Court of Canada in D.B.S. v. S.R.G. (2006 SCC 37) established the framework for retroactive awards. Courts consider four factors: the reason for the recipient's delay in seeking modification; the payor's conduct, including failure to disclose income changes; the circumstances of the children; and hardship the retroactive award may cause the payor.

The presumptive retroactive date is three years before formal notice to the payor, unless circumstances justify a different period. Courts will not award retroactivity where the delay was unreasonable without justification, where the payor made genuine efforts to fulfill obligations, or where retroactivity would cause disproportionate hardship. In New Brunswick, retroactive modifications typically range from 12 to 36 months depending on case circumstances. Interest does not automatically accrue on retroactive amounts, but courts may order interest where the payor engaged in deliberate non-disclosure.

Enforcement When the Other Parent Does Not Pay

The Office of Support Enforcement (OSE) enforces child support orders in New Brunswick, collecting over $55 million annually for beneficiary families. Enforcement tools available under the Support Enforcement Act include wage garnishment, seizure of bank accounts (including jointly held accounts), interception of federal payments (income tax refunds, GST credits, Employment Insurance benefits, Canada Pension Plan payments), driver's license suspension for arrears exceeding four months of support, passport denial for international travel, credit bureau reporting affecting the payor's credit score, and property liens.

To engage enforcement services, register your child support order with the OSE if not already enrolled. File arrears documentation showing the outstanding balance. The OSE will initiate collection through the most effective available method based on the payor's circumstances. Federal payment interception through the Family Orders and Agreements Enforcement Assistance Act (FOAEAA) proves particularly effective, automatically redirecting eligible federal payments to the support recipient. Contact the OSE Central Payment Unit at PO Box 6000, Fredericton, NB E3B 5H1 or call 1-844-673-4499 for assistance.

When Child Support Ends in New Brunswick

Child support in New Brunswick continues until the child reaches the age of majority (19 years) and is no longer a dependent. Under Divorce Act, R.S.C. 1985, c. 3, s. 2(1), a "child of the marriage" includes any child over the age of majority who remains under parental charge due to illness, disability, or pursuit of reasonable education. Terminating support for an adult child requires demonstrating the child no longer qualifies as a dependent through education completion, full-time employment, marriage, or independent living.

To end child support when a child reaches 19, file a variation application under Divorce Act, s. 17 demonstrating the child no longer meets dependency criteria. Include evidence such as the child's employment records, post-secondary completion documentation, or proof of independent residence. If the child remains enrolled in full-time post-secondary education, support typically continues until program completion, typically age 23-24 for undergraduate studies. Courts assess each case individually, considering the child's progress, reasonable educational path, and continued dependence on parental support.

Frequently Asked Questions

How much does it cost to modify child support in New Brunswick?

Filing a child support variation application with the New Brunswick Court of King's Bench, Family Division costs $100 as of March 2026. Fee waivers are available under Rules of Court, Rule 72.24(2) for recipients of social assistance under the Family Income Security Act or individuals experiencing financial hardship. Alternatively, the Child Support Recalculation Service operates at no cost for eligible families where both parents earn under $150,000.

What qualifies as a material change in circumstances for child support modification in New Brunswick?

A material change in circumstances includes any change that would result in a different child support amount under the Federal Child Support Guidelines. Common qualifying changes include income variations of 10% or more, job loss or new employment, changes in parenting time exceeding the 40% threshold, changes in the number of children requiring support, and updates to the Federal Child Support Guidelines tables (most recently October 1, 2025). The court must find the change is significant, ongoing, and not contemplated in the original order.

Can I modify child support without going to court in New Brunswick?

Yes, the New Brunswick Child Support Recalculation Service (CSRS) allows eligible families to recalculate child support annually without a court appearance. Eligibility requires both parents to reside in New Brunswick, neither parent earning over $150,000 gross annually, and an existing order in place for at least one year. The service automatically recalculates support using current income and updated Guidelines tables. Contact 1-833-224-2225 or enroll online at gnb.ca/csrs.

How long does a child support modification take in New Brunswick?

Uncontested child support modifications where both parents agree typically take 4 to 8 weeks for court approval. Contested variations requiring judicial hearing may take 6 to 12 months depending on court scheduling and case complexity. The Child Support Recalculation Service processes annual recalculations within 30 days of receiving complete income documentation from both parents, with a subsequent 30-day objection period.

Can child support be modified retroactively in New Brunswick?

Yes, courts may order retroactive child support modifications under Divorce Act, s. 17(1). The presumptive retroactive period extends three years from when the payor received formal notice of the modification request. Courts consider the reason for delay, the payor's conduct regarding income disclosure, the children's circumstances, and potential hardship. Retroactive awards typically range from 12 to 36 months.

What happens if my ex-spouse's income increases but they refuse to pay more?

If you believe the other parent's income has increased significantly, file a variation application with the Court of King's Bench requesting increased support. Request full financial disclosure through Form 72J. If the other parent fails to provide financial information, the court may impute income based on available evidence or draw adverse inferences. Courts take non-disclosure seriously and may award costs against non-compliant parties.

Can child support be reduced if I have another child with a new partner?

Possibly. Under Federal Child Support Guidelines, s. 10, undue hardship claims may justify deviation from table amounts. Supporting a new child in your household may qualify if paying the full table amount creates financial hardship AND your household's standard of living is lower than the recipient household's. Courts compare household standards of living using prescribed formulas. This is a high threshold rarely met simply by having additional children.

How does shared parenting time affect child support modification in New Brunswick?

When parenting time changes to shared arrangements (40% or more with each parent), child support calculations shift under Federal Child Support Guidelines, s. 9. Both parents' incomes factor into the calculation using a set-off method. The parent with the higher table amount pays the difference to the other parent. Document actual parenting time carefully over 12 months before seeking modification based on changed arrangements.

What if the other parent quits their job to avoid paying child support?

Courts may impute income to a parent who is voluntarily underemployed or unemployed under Federal Child Support Guidelines, s. 19(1)(a). The court assesses whether the unemployment is intentional by examining the parent's age, education, health, work history, and job market conditions. If imputation applies, child support calculates based on what the parent could reasonably earn, not their actual income. Present evidence of the parent's earning capacity and job opportunities in your variation application.

Does the updated October 2025 Federal Child Support Tables justify a modification?

Yes, the Federal Child Support Guidelines update effective October 1, 2025 may constitute a material change in circumstances justifying variation. The 2025 tables incorporate 2023 tax rules (previously 2017 rules) and raise the minimum income threshold from $13,000 to $16,000. Parents with existing orders based on pre-October 2025 tables may apply for variation if the new tables produce a materially different amount. Contact the Child Support Recalculation Service at 1-833-224-2225 to determine if recalculation applies.