FAMILY LAW CALCULATORS

Retroactive Child Support Calculator โ€” Canada

Calculate back child support owed from the date of separation or formal demand under Canadian family law.

$
Amount required under Guidelines or court order.
$
Average monthly amount actually received. Enter 0 if nothing was paid.
Max 36 months (3 years) under DBS v SRG in most cases.

Enter your details to see results

Disclaimer: Retroactive support is fact-specific and court-discretionary. Consult a family lawyer. Not legal advice.

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Frequently Asked Questions

How far back can I claim retroactive child support in Canada?
Under DBS v SRG (2006 SCC), courts generally award retroactive support up to 3 years before the date of formal demand (usually the date of the application). If the payor engaged in blameworthy conduct (hiding income, threatening the recipient), courts may go back further.
What is a 'formal demand' for retroactive child support purposes?
A formal demand is typically the date you filed your court application or sent a written demand to the other parent. Informal requests (text messages, verbal requests) may not qualify. The 3-year period generally runs back from this date.
Can I get retroactive support if the payor got a raise?
Yes. If the paying parent's income increased significantly and they did not voluntarily disclose this increase or seek to vary the order, you can apply for retroactive support from the date of the income change โ€” subject to the 3-year general limit from your formal demand.

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