Four free tools built around Ontario law: child support under the Federal Guidelines, net family property equalization, support arrears and enforcement, and parenting time percentages. Everything runs in your browser — nothing you enter is sent to us or stored anywhere.
Can you calculate Ontario family law numbers yourself? For child support, largely yes — the basic table amount is set by the Federal Child Support Guidelines and follows directly from the payor’s gross annual income, the number of children and the province. For property division, the equalization payment follows a defined formula under Ontario’s Family Law Act, though the valuations that feed it are often disputed. What a calculator cannot settle is entitlement, imputed income, shared-parenting adjustments under section 9, or spousal support — those turn on facts and argument, not arithmetic. Treat any figure below as a starting point for a conversation, not an answer.
Each tool covers a different part of a separation. They are free, require no account, and run entirely on your own device.
Works out the basic monthly table amount under the Federal Child Support Guidelines using the payor’s gross annual income and the number of children, then adds each parent’s proportional share of section 7 special and extraordinary expenses. Handles primary residence and shared custody arrangements.
Calculates net family property (NFP) for each spouse and the resulting equalization payment under Ontario’s Family Law Act. Assets and debts at the valuation date, less what each person brought into the marriage — with the matrimonial home treated separately, as the Act requires.
Estimates accumulated support arrears and accrued interest, and sets out the enforcement measures the Family Responsibility Office can take where payments have been missed — from wage garnishment through to licence suspension.
Maps a parenting schedule onto a calendar and works out the percentage of overnights each parent has. That percentage matters: at or above 40 percent, the shared-parenting provisions in section 9 of the Guidelines change how child support is calculated.
Choose a calculator below. Your figures stay in your browser — nothing is transmitted, logged or saved.
Trouble loading the tools? Get in touch and we will walk you through the calculation.
These tools are accurate for what they measure. The difficulty in most real cases is not the arithmetic — it is agreeing on the numbers that go into it. The most commonly contested inputs are:
Line 150 is the starting point, not the finish. Self-employment, corporate income, bonuses, stock compensation and non-taxable benefits are all routinely adjusted. Where a payor is intentionally under-employed or has not disclosed properly, a court can impute income — a figure no calculator can predict.
Equalization is measured at the date of separation, and establishing that date is itself sometimes in dispute. Pensions, business interests and property owned before the marriage all require proper valuation before the formula produces a meaningful number.
Deliberately not included here. Spousal support requires establishing entitlement first, and the Spousal Support Advisory Guidelines then produce a range rather than a figure. Read how spousal support is determined in Ontario.
Equalization of net family property applies to married spouses only. Common-law partners in Ontario have no automatic right to property division and must advance a different kind of claim, such as unjust enrichment or a constructive trust.
The basic amount comes from the Ontario table in the Federal Child Support Guidelines and depends on the payor’s gross annual income and the number of children. On top of that, section 7 special and extraordinary expenses — childcare, health costs, and some education and activity costs — are usually shared in proportion to each parent’s income.
They are free and require no sign-up. Every calculation runs inside your own browser. Nothing you type is transmitted to Tailor Law or retained anywhere, so you can model different scenarios privately.
Often it is close for the basic table amount of child support, because that figure is set by regulation. It is far less predictable for equalization, arrears and anything involving shared parenting, where the inputs themselves are frequently contested. Treat the output as an informed estimate.
Under Ontario’s Family Law Act, each married spouse totals the value of their assets less debts at the date of separation, then deducts the net value of what they brought into the marriage. The spouse with the higher net family property pays the other half of the difference. The matrimonial home receives special treatment and is generally not deducted even if one spouse owned it before the marriage.
Because of section 9 of the Guidelines. Once a parent has the children at least 40 percent of the time, child support is no longer simply the table amount — the court considers the set-off between both parents’ table amounts, the increased costs of shared parenting, and the circumstances of each household.
The FRO enforces support orders and agreements filed with it. Its powers include garnishing wages and bank accounts, suspending a driver’s licence, reporting to credit bureaus, and bringing a defaulting payor before the court. Arrears do not expire simply because time has passed.
Bring your figures to a consultation and we will tell you where they hold up, where the other side is likely to push back, and what the realistic range actually looks like.
Or call (905) 366-0202 · info@tailorlaw.com
These calculators provide general estimates based on Ontario family law and are not legal advice. Results depend entirely on the accuracy of the figures entered and on facts a calculator cannot assess. Speak with a lawyer before relying on any number for a settlement or court filing.
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