How does self-employment affect child support?
Child support generally starts with each parent's adjusted taxable income. If self-employment means that figure does not adequately reflect a parent's financial capacity, Services Australia may need more information or a different process may be relevant. The result depends on the facts—not on self-employment by itself. Services Australia
Where the assessment starts
Start with adjusted taxable income, not turnover.
Services Australia generally bases an assessment on the adjusted taxable income for the financial year that ended before the current child support period.
Adjusted taxable income (ATI) is a defined total. For child support it includes taxable income, reportable fringe benefits, target foreign income, total net investment losses, certain tax-free pensions or benefits, and reportable superannuation contributions. DSS Child Support Guide
Taxable income is therefore one component of ATI, not another name for the whole figure. The usual formula does not simply use business sales, the amount moving through a bank account, or the amount a sole trader draws from the business. Services Australia
- Taxable income
- The income figure produced under tax rules after allowable deductions. For a sole trader, net business income generally feeds into the person's tax return.
- Adjusted taxable income
- The child-support income measure that begins with taxable income and includes the other specified components above.
A useful distinction
Four figures can describe different things.
They may be related, but they are not interchangeable and none is automatically treated as personal child-support income.
| Concept | What it describes | Why it may differ |
|---|---|---|
| Taxable income | Income worked out under tax rules after allowable deductions. | Tax deductions can be legitimate while still making taxable income an incomplete picture of available resources in some cases. |
| Adjusted taxable income | The defined income measure used in the child support formula. | It includes specified items beyond taxable income but does not describe every asset, cash movement or financial resource. |
| Turnover & cash flow | Business sales and the timing of money entering and leaving the business. | They do not, by themselves, show profit, debts, working capital needs or what is personally available. |
| Financial resources | A broader view of resources and capacity that may be relevant in special circumstances. | This is case-specific and may involve income, property, business structures, benefits and the overall financial position. |
The DSS Guide says a parent's financial capacity may be more or less than the income used because of income, property and financial resources. DSS Reason 8 guidance
Common business circumstances
The structure and the real financial position both matter.
These circumstances can prompt questions. They do not create automatic add-backs or decide an assessment by themselves.
Sole traders and drawings
A sole trader may take drawings—money or goods withdrawn for personal purposes—rather than pay themselves a wage. Drawings are not automatically the same as profit or ATI. The business's full position can matter when assessing what resources are personally available.
Companies and trusts
Company revenue and trust assets do not automatically become a parent's personal income. In a Change of Assessment, Services Australia may examine control, distributions, benefits, the connection between a parent's work and entity income, and other relevant facts.
Expenses and losses
Business expenses and losses can be entirely legitimate. If a Change of Assessment is considered, the Guide says the full financial position may be examined, including whether deductions or losses leave additional personal resources available.
There is no rule that every tax deduction is automatically reversed for child support.
Retained profits
Retaining profit can serve genuine business needs. Depending on the facts, undistributed company, partnership or trust profits may also be examined where the assessment does not adequately reflect financial capacity.
Personal and business use
Mixed expenses can include vehicles, phones or a home office. A business-provided car, housing, equipment or other benefit may also be relevant. The question is the actual personal benefit and financial capacity—not the label on an account.
Irregular or seasonal income
A year-end figure can flatten peaks and troughs. Clear records of when work was performed, invoices were paid, expenses arose and one-off amounts were received can help explain why one period is not representative.
Delayed tax returns
If a return has not been lodged and income is not provided, Services Australia may use a provisional income. It may ask for evidence, and later information can produce debts or overpayments. Services Australia
A recent income change
A sharp fall or increase after the last relevant year can make the historic figure a poor guide to current circumstances. An income estimate may be available only where the statutory conditions are met; it is not simply a request to substitute a preferred figure.
What can a parent do?
Match the pathway to the problem.
Start with the narrowest step that describes the mismatch. Neither parent is guaranteed a changed assessment.
Lodge or update income information
Lodge tax returns as soon as possible and tell Services Australia about income changes. If no return is required, income can still need to be confirmed for Child Support.
Check whether an income estimate can apply
A parent may be able to estimate current-year ATI when it is at least 15% lower than the income being used and the other requirements are met. Estimates are reconciled against actual income after the year. Check the current rules
Understand Change of Assessment
In special circumstances, either parent may apply where income, property, financial resources or earning capacity are not adequately reflected. Services Australia considers whether changing the assessment would be fair, just and equitable, and otherwise proper. Read the current application
Ask what evidence is relevant
Focus on records that explain the figures, the business structure, unusual transactions and what was genuinely available for personal use.
Get case-specific help when the stakes are high
Services Australia can explain administrative options. An accountant can help explain business records and tax treatment; a family lawyer can advise on legal strategy and review rights.
Evidence examples
Records can turn a figure into an explanation.
The useful records depend on the issue. This is an example list, not a mandatory checklist for every case.
- Tax returns and notices of assessmentFor the parent and, where relevant, the business entities.
- Profit-and-loss statementsShowing income, expenses and comparison periods.
- Balance sheetsTo help explain assets, liabilities and working capital.
- Depreciation schedulesWith context about the assets and replacement needs.
- Bank and loan recordsLimited to transactions genuinely relevant to the issue.
- Company, trust or partnership documentsSuch as financial statements, deeds, distributions and current accounts where relevant.
- Explanations of unusual transactionsFor one-off receipts, seasonal changes, loans, capital purchases or delayed invoices.
- A concise chronologyLinking the income change or business event to the assessment period.
The current Change of Assessment form warns that an application and supporting evidence may be exchanged with the other party. Remove personal details you do not want disclosed, obtain permission before providing a third party's information, and do not include material that could contribute to family and domestic violence. Services Australia form CS1970