What are soft costs?

Claudia AinsleyWritten byClaudia Ainsley
Reviewed byMatt Leeburn
Updated 26 Aug 2026

Soft costs are the indirect expenses of a construction project: professional fees, approvals, finance and marketing costs that support delivery but are not built into the fabric.

Also known as: indirect costs, soft cost

Key points

  • They are indirect and usually not permanently incorporated into the finished asset, unlike hard costs such as labour, materials and plant.
  • Timing is uneven: many land before construction starts, others at handover, and interest accrues right through the build.
  • They shape funding requirements and lender assessments, and they create cashflow pressure early in a project.
  • Poorly scoped soft costs are a common source of disputes, variations and contract claims.
  • Budget them separately from hard costs and give them their own contingency, so the two are not double counted.

What soft costs cover

Soft costs against hard costs

Insurance and tax treatment

Example

Not to be confused with

Capital expenditure (CapEx)
capital expenditure is the spend that creates the asset, while soft costs are the indirect spend around it, much of which is capitalised into that same asset
Soft asset
a soft asset is an asset with little resale value once installed, not an indirect project expense

Frequently asked questions

Are finance costs a soft cost?

Yes. Interest during acquisition and construction, establishment fees and bank charges all sit in the soft cost column, and on a development they can be one of the largest lines. Model them separately from the fee based soft costs, using the drawdown profile for the build.

Do soft costs attract GST?

Invoices for taxable supplies generally do. Where the expense relates to a creditable purpose, the owner may be entitled to claim input tax credits. How the contract is structured affects the timing of those credits, so check the ATO guidance or ask your accountant.

Can soft costs be capitalised for tax purposes?

Some can. Costs directly attributable to constructing a capital asset may be capitalised, and depending on the nature of the expense they can attract capital works deductions or depreciation on plant and equipment. Recurrent operating costs are expensed instead. Classification is worth taking advice on.

What is soft cost insurance?

Often sold as delay in start up cover, it pays additional standing costs and lost income when an insured event delays completion. Waiting periods, indemnity periods and the sum insured vary between policies, and insurers expect documentation linking the extra cost to the insured event.

How much contingency should I allow for soft costs?

A soft cost contingency of roughly 10 to 20% of the estimated soft costs is typical, and more for novel or complex projects. Keep it separate from the hard cost contingency so the two are not double counted, and document the reasoning behind the figure.

Go deeper

Sources

This article is general information only and is not financial advice.