How to Calculate Child Support in Australia: The 2026 Guide

Need to calculate child support? You're in the right place. This guide shows you exactly what information you need, how the calculation works, and the fastest way to get an accurate estimate.

How Much Child Support Will I Pay in Australia?

Want to understand how it works first? Keep reading for the step-by-step process.

Child support in Australia typically ranges from $2,000 to $20,000 per year ($167-$1,667/month), depending on your income, care arrangement, and number of children. Low-income parents pay a minimum of $534/year, while high-income parents ($200k+) can pay $30,000+ annually. The exact amount depends on the 8-step formula that considers both parents' incomes and care percentages.

What Is the Minimum Child Support Payment in Australia?

The minimum child support payment in Australia is $534 per year (2026 rate) if you receive income support and have at least regular care (2+ nights per fortnight). For low-income payers without income support, the fixed annual rate is $1,815 per child per year, capped at three children. These minimum rates ensure children receive basic financial support regardless of the paying parent's income level.

For 2 children, child support typically ranges from $8,000-$25,000 per year depending on combined income and care arrangements. Example: Parent A earns $80,000, Parent B earns $50,000, Parent A has 0% care → Parent A pays approximately $18,500/year ($1,542/month) for 2 children aged 5 and 8. The exact amount depends on the official Costs of Children table and care percentages. See our router.push('/blog/child-support-calculator-2-children')} > detailed guide for 2 children scenarios

How Much Child Support for 2 Children in Australia?

Child support is not strictly mandatory for all parents, but it is effectively mandatory if you receive Family Tax Benefit (FTB) Part A.

Exceptions apply:

Is Child Support Mandatory in Australia?

If you don't receive FTB:

Child support in Australia is calculated using the Services Australia formula that considers both parents' adjusted taxable incomes and care arrangements. The basic formula is: (Your Income % - Your Cost %) × Total Costs of Children. Services Australia applies this to determine who pays, how much, and when. Most parents pay between $1,815 (minimum) and $30,000+ annually depending on income and care.

How Is Child Support Calculated in Australia?

Before you can calculate child support, collect these details:

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Step 1: Gather the Information You Need

If you have router.push('/blog/child-support-second-family')} > children from a second family

Child support income is your taxable income minus the Self-Support Amount (SSA). The SSA is $31,046 in 2026—the minimum income you need to support yourself.

Step 2: Calculate Child Support Income

Add both parents' child support incomes together, then calculate each parent's percentage of the total.

Use the official Costs of Children table based on combined income, number of children, and their ages. This table is updated annually and varies significantly by income level. Learn more about router.push('/blog/child-support-formula-australia')} > how the formula works

Step 3: Calculate Income Percentages

Convert nights per year into care percentage, then use the formula to calculate cost percentage. This determines how much of the costs you cover through direct care.

Subtract your cost percentage from your income percentage. Multiply by the total costs of children. This is your annual child support amount.

Step 4: Look Up the Costs of Children

Manual calculation is possible but has significant risks:

Not sure if you need a lawyer? Read our guide on router.push('/blog/when-to-hire-family-lawyer')} > when to hire a family lawyer

Step 5: Calculate Care and Cost Percentages

Step 6: Apply the Formula

Why Use a Calculator Instead?

Common Questions

Frequently Asked Questions