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Sole Custody Child Support Calculator Ontario

Reviewed by Calculator Editorial Team

This calculator helps Ontario parents calculate child support when one parent has sole custody. Enter your income, child's age, and other details to get an accurate estimate of monthly child support payments.

How to Use This Calculator

To calculate child support for sole custody in Ontario:

  1. Enter your annual income before taxes
  2. Select the number of children
  3. Enter the age of the oldest child
  4. Select your province of residence
  5. Click "Calculate" to see your estimated monthly child support payment

The calculator uses Ontario's child support guidelines to provide an estimate. For exact amounts, consult a legal professional or the Ontario Child Support Guidelines.

Formula Used

The Ontario Child Support Guidelines use a formula based on:

Monthly Child Support = (Annual Income × 0.175) ÷ 12

This formula applies to parents with sole custody in Ontario.

The Ontario government uses a 17.5% rate of the parent's net income to calculate child support. This amount is then divided by 12 to get the monthly payment.

Assumptions

  • You have sole custody of the child(ren)
  • You are the primary caregiver
  • You are a resident of Ontario
  • The calculation is based on net income
  • No deductions are made for other dependents

For exact calculations, consult the Ontario Child Support Guidelines or a legal professional.

Worked Example

Let's calculate child support for a parent with:

  • Annual income: $50,000
  • Number of children: 1
  • Oldest child's age: 5 years
  • Province: Ontario

Monthly Child Support = ($50,000 × 0.175) ÷ 12

= ($8,750) ÷ 12

= $729.17 per month

This example shows the estimated monthly child support payment for a parent with $50,000 annual income.

Frequently Asked Questions

What is the Ontario Child Support Guidelines rate?
The Ontario government uses a 17.5% rate of the parent's net income to calculate child support.
Do I need to pay child support if I have sole custody?
Yes, if you have sole custody but your ex-spouse is not providing financial support, you may need to pay child support.
How is child support calculated for multiple children?
The same formula applies, but you may need to adjust for the number of children based on specific circumstances.