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How to Calculate Profit on a Development Project

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

To calculate profit on a development project, subtract total costs (including land, construction, and holding costs) from the sale proceeds. Consider GST implications and capital gains tax. Use realistic projections for accurate results.

Calculating profit on a development project involves a comprehensive analysis of both costs and revenues. The goal is to accurately assess the financial outcome after accounting for all expenses and taxes. This process requires a detailed understanding of Australian development costs, tax implications, and market conditions.

Under the ATO's framework, your starting point is the project's total revenue, typically from the sale of developed units or properties. From this, you subtract the total costs, which include land acquisition, construction, financing, professional fees, and holding costs. It's essential to account for the Goods and Services Tax (GST), which may apply to sales, and Capital Gains Tax (CGT) implications.

A common misconception is that profit can be simply calculated by subtracting construction costs from sale proceeds. However, this ignores critical factors such as interest on loans, developer fees, and potential cost overruns. It's also crucial to incorporate risk factors and market volatility into your calculations.

To see how this plays out, consider a practical example. Take a 10-unit apartment development in Sydney, purchased for $2 million, with construction costs of $3.5 million. Suppose the project sells for $8 million. The total costs, including land, construction, and additional fees, amount to $6 million. After subtracting these costs, the gross profit is $2 million. However, after accounting for GST and other taxes, the net profit may be significantly less.

In our experience reviewing thousands of properties across Australia, we see developers often underestimate holding costs, particularly in projects that extend beyond the expected timeframe. Another frequent oversight is not factoring in the full impact of GST on sales and purchases, leading to unexpected tax liabilities. Developers sometimes neglect to include a buffer for unforeseen expenses, which can erode profit margins if not planned for.

The answer can differ depending on your situation. For instance, if a project is held in a company structure, CGT discounts do not apply. Projects commenced before certain legislative changes may have different tax treatments. Additionally, the GST margin scheme might be applicable, altering the tax payable on sales. Also, consider the impact of joint ventures versus individual ownership structures.

Given the complexity of accurately calculating profit, engaging both a Chartered Quantity Surveyor and an accountant is advisable. A QS can provide detailed cost assessments and depreciation schedules, while an accountant ensures compliance with tax obligations and maximises tax efficiency.

  • Review all project costs, including land, construction, and holding expenses.
  • Assess potential sale prices based on current market conditions.
  • Factor in GST and CGT liabilities.
  • Consult with a Chartered Quantity Surveyor for a detailed cost analysis.
  • Work with an accountant to understand tax obligations and strategies.
  • Monitor market trends and adjust projections as needed.
  • Frequently Asked Questions

    How do I account for GST in my profit calculations?

    Include GST in both your sale price and purchase costs. Consider the GST margin scheme, which may reduce the GST payable on sales. Consult with an accountant for accurate GST treatment.

    Does land tax affect my development profit?

    Yes, land tax is a holding cost that should be included in your total project expenses. Rates vary by state, so check local regulations or consult a professional.

    What is the role of a Quantity Surveyor in profit calculation?

    A Quantity Surveyor provides detailed cost assessments, helping you accurately estimate construction and holding costs, and prepare tax depreciation schedules to maximise your tax returns.

    Can I claim CGT discounts on development profits?

    CGT discounts apply to individuals and trusts holding assets for over 12 months. Companies do not receive CGT discounts. The development's legal structure affects eligibility.

    How do state-specific taxes impact my project?

    State taxes, such as stamp duty and land tax, affect your project's costs. Each state has different rates and thresholds. Consult a local tax advisor for specific implications.

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    Written by Koste Team · Koste Chartered Quantity Surveyors · AIQS Member · RICS Member · TPB Registered · 1300 669 400 · info@koste.ai