Construction Cash Flow Management NZ is essential for builders, head contractors and subcontractors who need to manage project expenses, supplier payments, wages and delayed customer receipts. Even when a construction project is profitable, late progress payments and withheld retention money can create pressure on the business’s available cash.

Construction businesses often pay for materials, labour, subcontractors and equipment before receiving payment for completed work. When retention money is also withheld, the gap between money earned and money received can become even wider.

Understanding how to manage progress payment claims, retention obligations and project expenses can help construction businesses plan ahead, maintain working capital and reduce unexpected financial pressure.

This guide explains practical Construction Cash Flow Management NZ strategies, including how to track retention money, manage progress payments, prepare cash flow forecasts and respond to payment delays.

Key Takeaways for Construction Businesses

• Prepare regular cash flow forecasts for every active project.
• Submit progress payment claims accurately and on time.
• Track outstanding invoices and expected payment dates.
• Maintain a separate register for retention money.
• Understand the retention money requirements under the Construction Contracts Act 2002.
• Monitor supplier payments, subcontractor costs and project expenses.
• Review project profitability and working capital regularly.
• Plan for GST, income tax and other business commitments.

1. Why Construction Cash Flow Management NZ Matters

Cash flow is the movement of money into and out of a business. For construction companies, this movement can be particularly difficult to manage because project expenses and customer payments do not always happen at the same time.

A contractor may need to purchase materials, pay workers and cover equipment expenses weeks before receiving payment for completed work.

Common construction cash flow challenges include:

• Delayed progress payments from customers or head contractors.
• Retention money withheld from subcontractor payments.
• Increasing material and labour costs.
• Unexpected project variations and cost overruns.
• Supplier invoices falling due before customer payments arrive.
• Multiple projects requiring working capital simultaneously.
• Tax and GST payments falling due during periods of low cash availability.

Effective Construction Cash Flow Management NZ helps businesses identify these pressures early and make informed decisions about spending, project commitments and available working capital.

2. Understanding Progress Payments in Construction

Progress payments allow construction businesses to receive payment as work is completed rather than waiting until the entire project is finished.

For example, a contract may allow payments at different stages, such as:

• Completion of site preparation and foundations.
• Completion of structural work.
• Installation of roofing and exterior components.
• Completion of electrical and plumbing work.
• Practical completion of the project.

The actual payment milestones and claim process depend on the construction contract and applicable legislation.

What is a progress payment claim?

A progress payment claim is a formal request for payment for construction work completed during an agreed period or project stage.

The Construction Contracts Act 2002 establishes requirements for payment claims and payment schedules. A valid statutory payment claim must contain the required information, including the claimed amount, calculation details, relevant construction work and information about the payment response process.

Construction businesses should:

• Check payment claim dates in the contract.
• Document completed work and project milestones.
• Include relevant supporting information.
• Keep copies of submitted claims.
• Monitor payment schedules and due dates.
• Follow up on unpaid amounts promptly.

For further information, refer to the Construction Contracts Act 2002.

3. What Is Retention Money in New Zealand Construction?

Retention money is an amount withheld from a payment otherwise due to a contractor or subcontractor as security for the performance of contractual obligations.

For example, a head contractor may withhold an agreed percentage of a subcontractor’s payment until certain contractual conditions have been satisfied.

Retention money can affect Construction Cash Flow Management NZ because the subcontractor may have completed the work but still be waiting for part of the payment to be released.

Is withholding retention money compulsory?

No. It is not compulsory for a construction business to withhold retention money. However, if retention money is withheld in circumstances covered by the Construction Contracts Act 2002, the relevant statutory requirements must be followed.

The strengthened retention requirements took effect on 5 October 2023 for new commercial construction contracts and existing commercial contracts renewed on or after that date. They do not apply to construction contracts with homeowners or residential occupiers in the same way.

Businesses should check whether the specific contract falls within the statutory retention regime.

Read the official Building Performance guide to retention money requirements.

4. Understanding Retention Money Compliance Requirements

Construction businesses withholding retention money under the applicable statutory regime have specific responsibilities. These requirements are intended to protect subcontractors and ensure retention money is managed appropriately.

Key requirements include:

• Trust obligations: Retention money must be held on trust for the party entitled to receive it.
• Separate handling: Retention money must not be mixed with other business funds or assets.
• Compliant banking arrangements: Cash retention money must be held in an appropriate bank account with prescribed ledger arrangements, unless an applicable complying instrument is used.
• Accounting records: Detailed records of retention money and transactions must be maintained.
• Reporting: Required transaction information and quarterly reports must be provided to affected subcontractors.
• Permitted use: Retention money can only be used for permitted purposes under the statutory regime and applicable contract.
• Notice: At least 10 working days’ written notice is required before using retention money to remedy relevant defects in the circumstances covered by the Act.
• Payment: Retention money must be released when it becomes payable under the applicable contract and legislation.

Businesses should not treat retention money as ordinary working capital. Proper accounting systems are important for monitoring the amounts held, reporting transactions and meeting release obligations.

Refer to Section 18D of the Construction Contracts Act for the requirements relating to how retention money must be kept and used.

5. How Retentions Affect Construction Cash Flow

Retention money creates a difference between the value of completed work and the amount received immediately by a contractor or subcontractor.

Consider this illustrative example:

In this example, the subcontractor has completed $50,000 worth of work, but only $47,500 is payable before considering GST, other contractual deductions or adjustments.

The remaining $2,500 may become payable later, subject to the contract and applicable statutory requirements.

This is why construction businesses should monitor outstanding retention balances rather than assuming that all completed work represents immediately available cash.

6. Seven Construction Cash Flow Management NZ Strategies

1. Prepare a Rolling Cash Flow Forecast

A cash flow forecast helps construction businesses estimate future money coming into and going out of the business.

Include:

• Expected progress payments.
• Outstanding customer invoices.
• Retention money expected to be released.
• Supplier and subcontractor payments.
• Employee wages and related costs.
• Materials and equipment purchases.
• GST and other tax commitments.
• Insurance and business overheads.

Review the forecast regularly and update it when project timelines or payment dates change.

2. Maintain a Retention Register

A retention register helps businesses track money withheld from subcontractors and amounts they are waiting to receive.

Record the following information:

• Project and contract reference.
• Contractor or subcontractor name.
• Original payment claim amount.
• Retention percentage and amount.
• Date the retention was withheld.
• Contractual release conditions.
• Expected release date.
• Actual release and payment date.
• Outstanding balance.

Reconcile the register with accounting records and required retention reports.

3. Submit Progress Payment Claims on Time

Late payment claims can delay the receipt of money and make cash flow forecasting less reliable.

Set a regular schedule for preparing and submitting claims. Make sure the claim follows the contract requirements and contains appropriate supporting information.

Track each submission until the amount has been paid or any dispute has been resolved.

4. Review Contract Payment Terms

Before starting a construction project, review the payment arrangements and understand how they affect working capital.

Check:

• Payment claim frequency.
• Submission deadlines.
• Payment terms and due dates.
• Retention percentages and release conditions.
• Variation approval processes.
• Defect and completion requirements.
• Dispute resolution procedures.

Where retention money is involved, confirm that the contract arrangements comply with applicable statutory requirements. Seek legal advice if the terms are unclear.

5. Monitor Outstanding Invoices and Overdue Payments

Construction businesses should regularly review their accounts receivable rather than waiting until payments become significantly overdue.

Maintain a report showing:

• Invoices awaiting approval.
• Submitted payment claims.
• Payment schedules received.
• Amounts disputed.
• Overdue customer payments.
• Retention balances awaiting release.

Follow up on overdue amounts and keep written records of communications.

6. Review Project Costs and Profitability

A project may appear profitable but still create cash flow pressure when costs are paid before customer payments arrive.

Compare actual project expenses with the original budget. Monitor materials, labour, subcontractor payments, equipment, variations and overheads.

Regular project reviews can help identify cost overruns and determine whether agreed contract prices remain commercially sustainable.

7. Plan for Tax and Operating Commitments

Tax obligations should form part of every construction cash flow forecast.

Businesses should monitor GST where registered, income tax, provisional tax where applicable, PAYE where they employ staff and other statutory costs.

Setting aside funds and reviewing payment dates can help avoid unexpected cash shortages.

GST treatment of retention money depends on the nature and timing of the supply and the contractual arrangement. Businesses should confirm the correct treatment with a qualified tax adviser rather than assuming that all retention money is treated identically.

7. Common Construction Cash Flow Mistakes to Avoid

8. What to Do When a Construction Payment Is Delayed

Delayed payments can affect subcontractors, builders and head contractors, especially when multiple projects are operating at the same time.

If a payment is delayed, consider these steps:

1. Review the contract: Confirm the payment terms, claim requirements and due dates.
2. Check the payment claim: Ensure the claim contains the required information and supporting documents.
3. Review the payment schedule: Identify whether the payer has responded and whether any amount has been disputed.
4. Contact the payer: Request clarification and retain written records.
5. Update your cash flow forecast: Adjust expected receipts and upcoming expenses.
6. Understand your options: Consider professional legal advice if a payment dispute arises.

The Construction Contracts Act 2002 provides mechanisms for addressing certain construction payment disputes, including adjudication. Businesses should obtain appropriate advice about the process relevant to their circumstances.

For more information, visit Building Performance’s Construction Contracts Act guidance.

9. How an Accountant Can Support Construction Cash Flow Management NZ

Managing project payments requires accurate financial information, consistent reporting and forward planning. An accountant can help construction businesses understand how outstanding invoices, retention balances, project expenses and tax obligations affect their financial position.

Depending on the services agreed, accounting support may include:

• Reviewing management accounts and financial reports.
• Preparing cash flow forecasts and budgets.
• Monitoring accounts receivable and payable.
• Reviewing project costs and profitability.
• Supporting GST and income tax planning.
• Improving bookkeeping and financial reporting processes.
• Identifying working capital pressure points.

People Also Ask: Construction Cash Flow Management NZ

1. What is construction cash flow management?

Construction cash flow management is the process of monitoring and planning money coming into and going out of a construction business. It includes tracking progress payments, retention money, supplier invoices, wages, subcontractor costs and tax obligations so the business can meet its financial commitments.

2. Why is cash flow important for construction businesses in NZ?

Cash flow is important because construction businesses often pay for materials, labour and subcontractors before receiving customer payments. Effective Construction Cash Flow Management NZ helps businesses plan for these timing differences, maintain working capital and reduce the risk of payment difficulties.

3. What is retention money in construction?

Retention money is an amount withheld from a contractor or subcontractor’s payment as security for contractual performance. Where the Construction Contracts Act retention regime applies, the money must be held and managed according to statutory requirements.

4. Is it compulsory to withhold retention money in New Zealand?

No. It is not compulsory to withhold retention money. However, businesses that choose to withhold it in circumstances covered by the Construction Contracts Act 2002 must comply with the relevant trust, banking, record-keeping, reporting and payment requirements.

5. How can subcontractors manage delayed progress payments?

Subcontractors should submit payment claims on time, retain supporting documentation, monitor payment schedules, follow up on overdue amounts and review their contracts. They should also update their cash flow forecasts when expected payments are delayed.

6. How can construction businesses improve cash flow?

Construction businesses can improve cash flow by preparing rolling forecasts, invoicing promptly, tracking outstanding claims, maintaining retention registers, reviewing project profitability and planning for upcoming supplier, payroll and tax payments.

7. What records should businesses maintain for retention money?

Businesses should maintain records of contracts, payment claims, amounts withheld, retention balances, transaction reports, release dates and payments. Where the statutory regime applies, additional trust account and reporting requirements must also be followed.

8. How does the Construction Contracts Act protect subcontractors?

The Construction Contracts Act 2002 establishes rules for construction payments, payment claims, payment schedules, adjudication and retention money. Its retention provisions protect qualifying retention money held for subcontractors under relevant commercial construction contracts.

9. Can an accountant help with construction cash flow management?

Yes. An accountant can help review financial reports, prepare cash flow forecasts, monitor project profitability, identify working capital pressure points and support tax planning. This can help construction businesses make better-informed financial decisions.

10. Where can construction businesses get accounting support from DFK Orb360 O’Halloran?

DFK Orb360 O’Halloran has offices in Newmarket and Rosedale in Auckland, and Petone in Lower Hutt, serving businesses across the Wellington region. The firm can also discuss remote support for businesses elsewhere in New Zealand. Contact the team to discuss your accounting and business advisory requirements.

Final Thoughts on Construction Cash Flow Management NZ

Construction Cash Flow Management NZ is about more than tracking money received and paid. It requires a clear understanding of progress payment claims, retention money, project expenses, supplier commitments and future tax obligations.

Construction businesses that monitor outstanding payments, maintain accurate retention records and prepare regular cash flow forecasts are better positioned to identify financial pressure early and plan their next steps.

Whether you are a builder, head contractor or subcontractor, regular financial reviews can help you understand project performance and make more informed business decisions.

For accounting and business advisory support, contact DFK Orb360 O’Halloran to discuss your requirements.

Reviewed by: DFK Orb360 O’Halloran Team

Disclaimer: This article provides general information about New Zealand construction payments, retention money and cash flow management. It is not legal, tax or financial advice. The application of the Construction Contracts Act, GST rules and contractual payment terms depends on individual circumstances. Seek appropriate professional advice before making decisions.