The Feasibility Number Your Profit Margin Does Not Show: Peak Debt

Your feasibility can show an attractive projected margin and still hide a funding failure. Total revenue may exceed total cost, yet consultants, authority charges, land, interest and construction must be paid before settlements release the forecast revenue.

A capable developer asks two questions: “Does the project appear profitable?” and “Can it remain funded at every stage?” Peak debt helps answer the second.

What peak debt means

Peak debt is the greatest cumulative funding shortfall in your project cash flow before receipts reduce the balance. It is not automatically the lender's facility amount, and it is not a finance approval. It is a feasibility output that helps you discuss limits, equity, timing and buffers with qualified advisers and funders.

Build the CASH curve

1. Calendar: place acquisition, design, approvals, construction, sales and settlement into realistic periods.
2. Amounts: map cash outflows and inflows by month, including taxes and transaction costs advised for your circumstances.
3. Sequence: apply deposits, progress claims, retentions, equity and loan-draw assumptions when expected.
4. Headroom: compare the highest shortfall with proposed funding and contingency.

QBCC guidance on comparing quotes highlights scope, materials, timing and conditions; those details affect when construction cash is required. Australian Government risk guidance supports scenario testing, responsibility and review.

A clearly labelled hypothetical

A project forecasts $3 million of sales and $2.55 million of total costs. Its summary appears to show $450,000 before tax and other qualifications. The monthly model reveals a $2.1 million maximum cash shortfall just before completion. A two-month delay and slower settlements push the hypothetical peak to $2.23 million. The team now has a funding question the margin alone did not reveal.

Stress the timing, not only the totals

Test later approvals, delayed drawdowns, earlier claims, cost overruns and slower settlements. Avoid double-counting available equity or assuming presales can be used as cash before a lender and solicitor confirm the arrangement. Finance terms, valuation, interest, tax and legal consequences vary.

The Think Property Club System connects programme and feasibility. Finance brokers, accountants, solicitors, quantity surveyors and lenders test matters within their expertise; Support helps challenge a cash curve that only works on the best dates.

Your next action

Turn your feasibility into monthly columns. Calculate the cumulative balance in each month, identify the lowest point and rerun it with a practical delay.

Key Takeaway

Projected profit does not fund a project; the deal must survive its maximum cash requirement before revenue arrives.

Your Turn

In which month does your project reach peak debt, and what happens if the next receipt is delayed?

Continue learning

• Timeline feasibility
• Finance holding costs

Sources and boundaries

1. Australian Government, Make a risk management plan (current page; accessed 8 September 2026)
2. Queensland Building and Construction Commission, Seeking and comparing quotes (current page; accessed 8 September 2026)

This article is general education, not personalised planning, legal, financial, tax or building advice. Requirements and outcomes vary by jurisdiction, site, contract, structure and circumstances. Check current information with the relevant authority and appropriately qualified advisers.