Cash-flow calculator · Ontario · 2026
Ontario child support, by the table — and the cash flow underneath.
The basic table amount, the share of special expenses both parents owe, and what you would actually have left in your account every two weeks. No signup.
The official Ontario tables
Ontario's official child support tables, updated each year — the standard starting point for a table-amount calculation.
Special-expense share included
Childcare, post-secondary, and other big expenses split between the parents based on income — applied automatically.
What actually lands in your account
Estimated pay-period cash flow after Ontario tax and your support payment — the number that matters at the end of the month.
Cairn's Ontario child support calculator is a free tool that estimates support under the Federal Child Support Guidelines — no account, no fee. Ontario child support runs on two parts. The basic monthly amount comes from a fixed table — set federally, indexed to the paying parent's gross income and the number of children. On top of that, the parents share the cost of things the table is not meant to cover: childcare, post-secondary tuition, big extracurriculars, and health and dental costs over $100 a year not covered by insurance. That share is in proportion to the parents' incomes. Both parts apply together, not instead of each other.
Where men get caught: assuming the table amount is the whole obligation, or assuming the other parent's income changes the table. Neither is correct. When the kids live mostly with one parent, only the paying parent's income drives the basic table number. The other parent's income matters only for how the special expenses are split.
This calculator runs both pieces — the table amount and the special-expense share under the Guidelines — and shows what actually hits your account each pay period after Ontario tax and the support payment, in the same run.
Your income, and your spouse's
Both of your gross annual incomes — what you each make in a year before tax.
What you make in a year before tax. Use last year's tax return if it's handy, or your most recent T4.
The same number for your spouse — what they make in a year before tax. Your best honest estimate is fine.
Your kids and how time is shared
How many, their ages, and where they live most of the time.
Children of the relationship who still depend on the two of you. Enter 0 if there are none.
Time together, and ages
How long you've been a couple, plus both your ages.
Count the years you've been a couple, even before marriage. If you lived together for two years before getting married six years ago, enter 8.
We need this to figure out the realistic range for how long support might be paid.
Same reason — age and length of relationship together affect how long support typically lasts.
Methodology reviewed May 6, 2026 · Cross-validated against DivorceMate Tools One · See full sources · Read the guide
Common questions
The questions men ask about Ontario support.
Plain-language answers about how the Federal Child Support Guidelines and the Spousal Support Advisory Guidelines actually work in Ontario.
About Cairn
Cairn is an Ontario-built preparation tool for men going through separation. It gives you orientation, document checklists, and the financial picture in plain language — so you can prepare and then work with a legal professional.
Keep your numbers
Save this to a free Cairn account.
- Keep these numbers alongside your full separation plan
- Your specific Ontario next steps, in order
- Free to start — no credit card