Negative Gearing Explained: Cash Flow and Tax Estimates

Short answer

Negative gearing describes a rental investment whose deductible costs exceed its assessable rental income. A modelled loss is not the same as a cash shortfall or an ATO refund. Check the income year and which expenses are deductible before applying any tax rate.

Use the Negative Gearing Calculator to compare assumptions for 2026-27. Its single marginal-rate calculation is an indicative shortcut, not a tax return calculation, an entitlement decision or a recommendation to make a loss.

Keep cash spending and deductions in separate columns

For a first pass, write down rent received, cash operating expenses, loan interest and principal repayments separately. Then identify any supported non-cash deductions. Do not automatically treat every outgoing as deductible.

ASIC Moneysmart's property investment guidance discusses rental income, ownership costs and the need to cover a negatively geared property's shortfall. A tax effect does not pay the full cost of a loss or remove vacancy, rate and repair risks.

Worked example: three different results

These invented figures illustrate the arithmetic only. Assume $30,000 annual rent, $34,000 cash expenses that have all been confirmed deductible for this example, and a separately confirmed $4,000 non-cash deduction. There are no principal repayments, purchase costs or sale costs in this example.

The $2,400 is not a promised refund. It assumes the entire eligible loss can be used at the selected rate. It ignores bracket crossings, levies, offsets and other personal circumstances. It also ignores when any tax effect becomes available. The household still needs to fund bills when they fall due.

If an additional $6,000 of loan principal is repaid, cash flow before tax in this illustration falls to -$10,000. That payment reduces the loan balance; do not simply add it to the modelled deductions. The Mortgage Repayment Calculator can help separate principal and interest under its stated assumptions.

Why one marginal rate can mislead

Multiplying a whole loss by one rate is useful for a labelled scenario, but it can overstate the result when the deduction spans more than one tax bracket. It also cannot establish that an expense is deductible or that a loss can be used against another source of income.

Do not describe the result as an annual refund, guaranteed tax saving or the amount a property will cost to hold. Keep a separate cash budget, including principal payments and costs omitted from the model. The Investment Property Yield Calculator provides a related view of rent and entered cash costs.

Depreciation needs its own evidence

A purchase price is not automatically a deductible construction cost. Building works and individual assets need separate records and rule checks. The property depreciation guide explains the distinction and points to ATO sources.

This page does not prescribe a universal depreciation rate, a report fee or a deduction entitlement. Ask a registered tax agent to check the property's history, rental use and supporting records. A quantity surveyor's schedule does not replace that assessment.

Check the year before using a scenario

The 2026-27 Budget tax-reform page describes negative-gearing changes from 1 July 2027, including different treatment for new builds and established housing and transitional treatment for properties held before Budget night. This is a dated summary of that source, not an assessment of a particular property's treatment.

The site's negative-gearing calculator does not model those later-year acquisition-date and new-build rules. Do not carry a 2026-27 scenario into a later year without checking current ATO guidance and the applicable law with a registered tax agent. This guide does not determine whether a property meets a definition or exemption.

Questions to resolve before relying on an estimate

• Which income year does the calculation cover?
• Which expenses and non-cash deductions have supporting records?
• Does any borrowing or property use have a private component?
• Have principal repayments and cash costs been kept visible outside deductions?
• Does the tax-effect shortcut assume the entire loss falls within one bracket?
• Can the cash shortfall be funded before any tax outcome is known?

A higher assumed tax effect does not establish that an investment is suitable. This guide cannot recommend a property, gearing strategy or purchase decision.

Sources and limitations

• ASIC Moneysmart: Buying an investment property, checked 6 October 2026.
• Australian Government: Budget 2026-27 tax reform, checked 6 October 2026; describes changes from 1 July 2027.
• ATO: Rental properties guide, for current deduction and record-keeping guidance. Check the relevant income year; this guide does not certify individual claims.

General information and indicative arithmetic only. Not tax, legal, financial, credit or investment advice. Confirm applicable rules and deductions with the ATO and a registered tax agent before relying on an estimate.

Last updated: 6 October 2026.