Retention Money in Construction Contracts: Cash, Bank Guarantee or Retention Bond

Retention is the least examined line on most contractors' balance sheets. A principal withholds a percentage of every progress claim, holds it through construction and well past completion, and returns it in two instalments. For a contractor running several contracts at once, the aggregate sitting in principals' accounts can exceed the company's working capital facility — and most finance teams have never priced what that costs them.

This guide sits within BCS Broking's broader coverage of surety bonds for Australian construction and mining. It sets out how retention works under Australian contracts, what it costs, and how the three ways of satisfying it compare. A note on roles throughout: a retention bond is issued by an APRA-regulated surety underwriter, which carries the risk; BCS arranges and structures the facility on the client's behalf. BCS is the broker, not the risk carrier.

What is retention money in a construction contract?

Retention is a percentage of each progress payment that the principal is contractually entitled to withhold. It is not a fee and not a deposit — it remains the contractor's money, held as security against the risk that the works are not completed or defects are not rectified.

The mechanics are consistent across most Australian contracts. The principal deducts a percentage from each progress claim as it is certified, commonly 10% of the claim, until the accumulated total reaches a cap expressed as a percentage of the contract sum — usually 5%. Half is released at practical completion. The balance is released at the end of the defects liability period, commonly twelve months later.

The standard forms provide for this at their security clauses, and in AS 4000 and AS 2124 retention sits alongside the option of an unconditional undertaking. The annexure sets the actual percentages, so the printed clause never tells you the numbers on your contract. What the clauses require, and what satisfies them, is covered in bank guarantees in construction contracts.

Security of payment legislation in each state also affects how and when retention can be withheld, and several jurisdictions have introduced retention trust requirements for larger projects. Those regimes differ by state and change periodically.

What does retention actually cost a contractor?

Consider a representative scenario rather than a specific client: a civil contractor with a $20M contract, retention capped at 5%, defects liability period of twelve months.

At the cap, $1M of the contractor's money sits with the principal. Half comes back at practical completion; the remaining $500,000 is released roughly a year later. Across the life of the contract, the average balance outstanding is several hundred thousand dollars, and the final tranche is outstanding for a full year after the contractor has finished work.

The cost is not the retention itself — that money comes back. The cost is what the contractor could not do with it. For a business whose internal return on deployed capital exceeds its cost of funds, capital immobilised for two years has a real and calculable opportunity cost. For a business funding working capital on an overdraft, the cost is the interest rate on that facility applied to the outstanding balance.

Now scale it. A contractor running six contracts of similar size simultaneously has $6M at the cap. That is frequently more than the company's entire working capital facility, and it constrains the number and size of contracts the business can carry at once. Retention is a capacity constraint as much as a cash one — the same dynamic set out in do surety bonds free up working capital.

What are the three ways to satisfy a retention obligation?

Cash retention. The default. The principal simply withholds from progress claims. It requires no arrangement, no credit assessment and no negotiation — which is why it persists. It is also the most expensive of the three in opportunity cost, and it exposes the contractor to the principal's credit: if the principal becomes insolvent before releasing retention, the contractor is an unsecured creditor for its own money.

Bank guarantee. The contractor procures an unconditional undertaking from its bank in place of cash deductions. Progress claims are paid in full, which improves cash flow immediately. But a bank guarantee consumes the company's bank facility limit dollar-for-dollar, and banks commonly require cash backing or security over assets. The cash is often still immobilised, just in a different account.

Retention bond. An unconditional undertaking issued by an APRA-regulated surety underwriter rather than a bank, substituted for cash retention where the contract permits and the principal accepts it. For a qualifying contractor, a surety facility generally sits outside the bank facility, so it may free capital that a cash retention ties up and preserve bank capacity for other purposes. Availability and terms are assessed case by case and subject to underwriting.

How the three compare

Every row in the retention bond column is subject to underwriting and to the principal accepting the substitution.

When will a principal accept a retention bond, and when will it not?

This is the part that decides whether any of the above is useful, and it deserves an honest answer.

The contract governs. If the security clause and annexure contemplate cash retention only, a bond is not available without a variation the principal must agree to. Where the contract already contemplates an unconditional undertaking as an alternative, the path is much shorter.

Beyond the wording, principals differ. Some accept surety readily, particularly where they have dealt with the underwriter before. Others have procurement policies specifying acceptable issuers, and government principals frequently do. Some will not substitute at all, whatever the underwriter's rating — often because their own financiers or their internal policy require bank paper.

Three things improve the odds. Raise it before tender rather than after award, when the principal still has reason to be accommodating. Have the facility established so the wording can be put forward concretely. And expect to negotiate the wording itself, since principals commonly have their own form.

A contractor should plan on the basis that some principals will decline. A mixed position — bonds where accepted, cash where not — is the normal outcome, and still releases meaningful capital.

How is a retention bond facility set up?

A surety facility is a credit arrangement, assessed on the contractor's financial strength rather than on any single project. In outline: the underwriter reviews audited financials, work in hand and management track record; a facility limit is agreed; individual bonds are then issued against that limit as contracts are won.

Establishing a facility takes time, which is the single most common planning error. A contractor who wins a contract and then starts arranging security has usually left it too late. The process is set out in how surety bond facilities work and in setting up a surety bond facility.

Retention bonds are generally issued from the same facility as performance bonds, so a contractor establishing one for tender purposes can usually address retention at the same time. The bond type itself is covered on the retention bonds page.

FAQ

How much retention is withheld on Australian construction contracts?

Commonly 10% of each progress claim until the total reaches 5% of the contract sum. Half is typically released at practical completion and the balance at the end of the defects liability period. The annexure to the contract sets the actual figures, and amended contracts vary.

Is retention money the contractor's money?

Yes. Retention is the contractor's funds, withheld as security rather than earned by the principal. This is why principal insolvency is a genuine risk with cash retention — the contractor ranks as an unsecured creditor for money that was always its own. Several states have introduced retention trust regimes for larger projects to address exactly this.

What is a retention bond?

An unconditional undertaking issued by an APRA-regulated surety underwriter that a principal can accept in place of withholding cash retention. The contractor is paid progress claims in full, and the principal holds the bond as security instead. It can satisfy the retention obligation where the contract permits and the principal accepts it.

Is a retention bond cheaper than cash retention?

It carries a premium where cash retention does not, so on a direct fee comparison it costs more. The comparison that matters is against the opportunity cost of the capital released. For a contractor whose return on deployed capital comfortably exceeds the premium rate, the bond is usually the more efficient option — but that arithmetic depends on the individual business.

Does a retention bond use up bank facility limits?

Generally not. A surety facility ordinarily sits outside the bank facility, which is the main structural reason contractors pursue one. A bank guarantee, by contrast, consumes the limit dollar-for-dollar and is frequently cash-backed as well.

Will a principal accept a retention bond?

Some will, some will not. The contract wording governs, and beyond that it is the principal's commercial decision. Government principals commonly specify acceptable forms of security in procurement policy. Raising the question before tender rather than after award materially improves the chances.

How long does it take to arrange?

Once a facility is in place, individual bonds are typically issued in days. Establishing the facility itself involves credit underwriting on the company's financials and takes materially longer, which is why it is worth doing ahead of tendering rather than in response to an award.

Where to next

This article sits within BCS Broking's broader surety bonds for Australian construction and mining coverage. To go deeper:

• Retention bonds covers the instrument itself
• Surety bonds vs bank guarantees compares the two on cash, capacity and cost
• Do surety bonds free up working capital sets out the capital mechanics
• Bank guarantees in construction contracts covers what the standard forms require

If you would like retention across a current contract portfolio reviewed against what the surety market will currently issue, contact BCS Broking.

This information is general in nature and does not consider any specific objectives, financial situation or needs. Consider whether the information is appropriate before acting on it. Contract security provisions should be reviewed by your own legal advisers against the executed contract. BCS Broking Pty Ltd is an authorised insurance broker — a retention bond is issued by an APRA-regulated surety underwriter; BCS arranges the facility on the client's behalf (AFSL details on the Financial Services Guide).