SARPA Child Support Recalculation in Quebec: How the Administrative Process Works

What SARPA Does

SARPA — the Service administratif de rajustement des pensions alimentaires pour enfants — is an administrative service operated by Quebec's Commission des services juridiques (Legal Aid Commission). It recalculates child support payments when a parent's financial situation has changed, without requiring either parent to go back to court.

This matters because the alternative — filing a contested modification application — costs hundreds of dollars in court fees, takes months, and often requires legal representation. SARPA provides an administrative route that costs CA$57.25 per application (free if you qualify for gratuitous legal aid) and can avoid a court application when its eligibility requirements are met.

Eligibility Requirements

SARPA is available when all of the following conditions are met:

• Both parents reside in Quebec at the time of the application
• The child is under 18
• The combined disposable income of both parents does not exceed CA$200,000 — the service uses the same disposable income calculation as the official Quebec child support model (gross income minus the basic deduction, union dues, and professional fees)
• An existing court judgment or court-approved agreement already establishes child support — SARPA modifies, it does not create from scratch
• The modification is straightforward — it involves an income change, not a change in custody arrangement, and does not involve hardship claims or judicial discretion

If the custody schedule has also changed (say, a child moved from living primarily with one parent to a shared 50/50 arrangement), SARPA alone is not enough. You will need to file a modification through the Homologation Assistance Service (SAH) or a court application to update both the parenting order and the support amount.

How the Process Works

1. Either parent initiates the application by contacting their local legal aid office or the SARPA service directly. A joint application is optional; the other parent is then asked to provide the information and documents needed for the review.

2. The applicant and, when requested, the other parent provide updated financial documents: recent federal and provincial tax returns, Notices of Assessment from the Canada Revenue Agency and Revenu Québec, current pay stubs, and evidence of any other income sources. The SARPA clerk uses these to calculate each parent's current disposable income.

3. SARPA runs the official calculation using Quebec's Schedule I (Basic Parental Contribution Determination Table) for the current calendar year, applying the correct basic deduction (CA$13,865 for the 2026 tax year). The recalculation follows the same formula that a court would use.

4. SARPA sends an adjustment notice and new child-support determination to the parties and the court registry. Either party can ask the court to review the decision within 30 days.

5. If no one contests within 30 days, the adjustment takes effect on the 31st day after the notice and is sent for enforcement where applicable.

When SARPA Is Not the Right Route

SARPA is an administrative route and is not the route for a contested custody change. It cannot:

• Change the custody or parenting time schedule without the parents' agreement
• Address disputed special expenses (such as orthodontics, private school tuition, or high-cost extracurricular activities that exceed 5% of the basic parental contribution)
• Apply hardship clauses or deviate from the standard Schedule I tables
• Handle cases where one parent lives outside Quebec
• Create a first-time child support order

For custody modifications where both parents agree, the SAH (Homologation Assistance Service) at CA$651 is the appropriate route. For contested changes, a court application is necessary.

Key Documents to Prepare

Before contacting SARPA, gather:

• Your three most recent federal and provincial income tax returns
• Your most recent Notices of Assessment from CRA and Revenu Québec
• Current pay stubs covering at least the last three months
• Documentation of any additional income (rental income, self-employment income, investment income, employment insurance)
• A copy of the existing court order or agreement that established the current child support amount
• If applicable, receipts for childcare expenses, post-secondary education costs, or extraordinary medical expenses

Having these ready upfront prevents the back-and-forth delays that are the most common reason SARPA files stall.

The Connection Between Parenting Time and Support

A recurring question parents bring to SARPA: "If my ex and I informally changed the schedule so I now have the kids more, will SARPA adjust my support?" SARPA does not decide a contested custody change, and an informal schedule change that has not been reflected in the court order creates a mismatch. The custody schedule directly determines which child support formula applies (shared custody vs. sole custody with prolonged visiting rights vs. standard sole custody).

If the schedule has genuinely changed, formalize the modification first (through SAH or a court application), then use SARPA for any income-based recalculation afterward.

For a complete walkthrough of how Quebec's child support model works, how parenting time thresholds affect the calculation, and what to do when your circumstances change, the Quebec Child Custody & Parenting Plan Guide covers each step with practical worksheets.

See more Quebec guides →