What does peak debt mean on a development?

It is the highest balance the development loan reaches over the life of the project, including any interest added to it. On a single-stage project it usually comes just before the first settlements begin to repay the loan. The limit is sized by reference to it, because the limit has to carry the project through its most exposed point.

How do you calculate peak debt?

Build a period-by-period cash flow. For each month or quarter, take the opening balance, add the costs funded by debt and the interest added, and subtract the receipts applied to the loan. The largest closing figure is the peak. It cannot be taken from the budget total, because the sequence of spending and receipts decides it. Rerun the schedule with later settlements to see how far it moves.

How does peak debt differ from total development cost?

Total development cost is everything the project spends over its life, whoever funds it. Peak debt is the largest amount owed to the lender at one time. Peak debt can be much lower than total cost, because equity covers part of the spending and sales on a staged project can repay debt before later costs are paid. Both are needed, and they answer different questions.

What is a peak debt facility?

It is a revolving development loan, a term UK lenders use, for a project that completes in phases. Sales proceeds repay the balance and can be redrawn to build later phases, so the limit is sized to the forecast peak and not to total cost. It reduces the amount of debt needed but makes the build depend on sales being achieved on schedule, which is why lenders commonly attach sales milestones.

// WORKED EXAMPLETHE ARITHMETIC A DECISION RESTS ON

Peak Debt: a Worked Example

A facility is measured on its worst day.

BY MICHAEL SHANG · SIXTEEN YEARS IN COMMERCIAL BANKING · UPDATED 2026-11-09 · 6 MIN READ

// THE SHORT ANSWER

The question a lender asks of any drawn-down facility is how far it can go before money starts coming back. Peak debt is the answer: the top of the balance line, read from a month-by-month cash flow and not from the budget total. It sets the facility limit and the security needed, and a late payment or a delayed settlement moves it first. Because it depends on timing as much as cost, two projects with identical budgets can have very different peaks, and a forecast that looks sound on totals can run out of limit.

BASIS Practitioner judgment from sixteen years in commercial banking, set out in How Bankers Think (Highbank Press, 2026). Every borrower on this site is a composite constructed for teaching, not a client. The market is mid-market commercial lending as practised in New Zealand and Australia; where a convention differs elsewhere, the page says so.

// MAKE THE CALL

Issue 08 — Basalt Ridge Developments. A new-to-bank developer, a claimed 28% ROE and two other banks circling. Your bank has a growth target. Your call first, then the senior banker's.

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PART OF Property Development Finance

// 01 — WHY A LENDER SIZES TO THE WORST DAY

Total cost tells a lender how much a project needs in all. It says nothing about how much will be owed at once. A development spends for months before it collects anything, and a seasonal business buys before it sells. The debt climbs, turns and falls, and a lender cares about the top of that line because that is when the exposure is greatest and when the least has been proved. On a development the building is unfinished and the sales are unsettled. On a seasonal line the stock has been bought and may not sell.

It also matters because a committed limit is a hard edge. Once the balance reaches it, the lender is under no obligation to advance more, and on a development there may be a half-built project at that point. Security is measured against the same figure: a loan to cost or end-value test is only meaningful if it uses the debt at its highest.

// 02 — HOW THE PEAK IS FOUND

For each period:

Closing debt = opening debt + costs funded by debt + interest added

− receipts applied to the loan

Peak debt = the highest closing debt in the schedule

There is no shortcut, because the answer lies in the sequence. Several things raise it or move it. Equity going in first delays the start of the debt. Capitalised interest lifts every later balance. A build with heavy early spending peaks higher than one that is back-loaded. Deposits usually do not help, as they are often held by a stakeholder until settlement. On a staged project, receipts from the first stage can pay for the second, which brings the peak down but makes it depend on those receipts arriving on time.

On a project with a single completion, such as one block of apartments, the peak usually falls just before the first settlement. On a staged project it can come earlier or later, depending on when the next stage begins to spend.

// 03 — THE EXAMPLE

A developer is subdividing land into fifty residential lots in two stages. The case is constructed for this page like every figure in it. Equity of US$2.5m goes in first and is not in the table. Debt then funds US$8.0m to the end of stage 1 and US$4.0m for stage 2, which starts in quarter 4. Ten lots settle each quarter from quarter 4, with US$0.36m per lot applied to the loan. Interest is 8% a year, added quarterly on the opening balance and rounded to US$10,000. The facility limit is US$9.0m. All of these are the example's and none is offered as a market norm.

Plan (US$m) Costs Interest Settlements Closing

Quarter 1 3.50 – – 3.50

Quarter 2 2.50 0.07 – 6.07

Quarter 3 2.00 0.12 – 8.19 ← peak

Quarter 4 1.50 0.16 (3.60) 6.25

Quarter 5 1.50 0.13 (3.60) 4.28

Quarter 6 1.00 0.09 (3.60) 1.77

Quarter 7 – 0.04 (3.60) repaid

Average balance, quarters 1–6: 30.06 ÷ 6 = 5.01

Peak = 8.19

Headroom under the 9.00 limit = 0.81

A limit set near the average of US$5.01m would have run out during quarter 2. Against the peak, a limit of US$9.0m looks comfortable. Now the title for stage 1 arrives a quarter late, while the contract for stage 2 has already been let.

One quarter late (US$m) Costs Interest Settlements Closing

Quarter 3 2.00 0.12 – 8.19

Quarter 4 1.50 0.16 – 9.85 ← peak

Quarter 5 1.50 0.20 (3.60) 7.95

Peak moves from 8.19 to 9.85, up 1.66

Limit 9.00, so the shortfall is 0.85

Total costs have not changed by a dollar, apart from a little interest. The peak has risen by US$1.66m and moved a quarter later, because stage 2 was to be paid for by stage 1 settlements that did not arrive. The developer must find US$0.85m, or stop stage 2 and pay whatever a stopped contract costs. A lender would have shown this in a sensitivity case at approval, and it is why a slower sales case is run beside the base case.

DEFINED IN ONE PARAGRAPH → · DRAWING A DEVELOPMENT LOAN → · INTEREST RESERVE →

// 04 — HOW IT DIFFERS FROM THE FIGURES BESIDE IT

Peak debt is not the same as the peak funding requirement, which is the most the project needs from all sources at once, equity included. In the plan above, that is US$10.69m: the US$8.19m of debt plus the US$2.5m of equity. The equity is the difference between the two. Nor is peak debt the facility limit, which should sit above it with some margin, or the total cost, which ignores the receipts that come in before the spending stops.

UK lenders also use the phrase for a product. A peak debt facility is a revolving loan on a phased scheme, where sales proceeds reduce the balance and can be redrawn for later phases. It is sized on the forecast, so it depends on sales in a way a fully committed loan does not, and missed sales targets can leave the balance over the limit.

The same reading applies outside property. A wine producer pays its growers after vintage and collects over the following year, and a retailer buys for Christmas months before it sells, as in Issue 06. The seasonal line is set for the month the stock has been bought and has not yet turned into cash. The average tells the bank what the interest will be, and the peak tells it what it has to be willing to lend.

// 05 — WHERE IT DECIDES A FILE

At approval, the lender asks whose timetable produced the peak, and reruns it with a slower sell-down or a later start, since those are the changes that move it. The limit, the interest reserve and the security are sized together from the result. A file that shows only total cost and average balance has left out the number the lender most needs.

During the facility, the peak is a forecast that keeps changing. Each QS report and each sales update should roll it forward. A rising forecast peak is usually visible months before the limit is touched, and that is when there are still choices: delay the next stage, bring in more equity, or restructure the release prices on the lots that remain. Left until the limit is reached, the same conversation has fewer options and a half-finished project in it.

PROPERTY DEVELOPMENT FINANCE → · ISSUE 06 · THE SEASONAL LINE → · COST TO COMPLETE →

// QUESTIONS PEOPLE ASK

What does peak debt mean on a development?: It is the highest balance the development loan reaches over the life of the project, including any interest added to it. On a single-stage project it usually comes just before the first settlements begin to repay the loan. The limit is sized by reference to it, because the limit has to carry the project through its most exposed point.
How do you calculate peak debt?: Build a period-by-period cash flow. For each month or quarter, take the opening balance, add the costs funded by debt and the interest added, and subtract the receipts applied to the loan. The largest closing figure is the peak. It cannot be taken from the budget total, because the sequence of spending and receipts decides it. Rerun the schedule with later settlements to see how far it moves.
How does peak debt differ from total development cost?: Total development cost is everything the project spends over its life, whoever funds it. Peak debt is the largest amount owed to the lender at one time. Peak debt can be much lower than total cost, because equity covers part of the spending and sales on a staged project can repay debt before later costs are paid. Both are needed, and they answer different questions.
What is a peak debt facility?: It is a revolving development loan, a term UK lenders use, for a project that completes in phases. Sales proceeds repay the balance and can be redrawn to build later phases, so the limit is sized to the forecast peak and not to total cost. It reduces the amount of debt needed but makes the build depend on sales being achieved on schedule, which is why lenders commonly attach sales milestones.

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SIGNAL OR NOISE · THE ECONOMY · COLLATERAL MARKETS

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THE READING ROOMIN ONE PARAGRAPHPeak debt What is peak debt?