How to Invoice Government and Large Corporate Clients in Australia Without Waiting 90 Days

Landing a government contract or a major corporate client feels like a milestone for any Australian small business. Then the first invoice goes out — and weeks pass. Then months. You follow up with someone in accounts payable, get forwarded to a procurement coordinator, submit the invoice again through a supplier portal, and eventually receive payment 75 days after the work was done. Sound familiar? You are not alone. Late payment by large organisations is one of the most significant cash flow challenges facing Australian SMEs, but there are real strategies you can use to protect your business while keeping these relationships intact.

Why Large Clients Pay Slowly

Before developing a strategy, it helps to understand the structural reasons large organisations take so long to pay. Unlike a small business owner who can approve a payment with a click, large organisations have layered approval processes that were designed for control, not speed.

• Multi-level approval chains: An invoice might need sign-off from a project manager, a department head, a finance director, and a CFO before it even reaches accounts payable
• Accounts payable batch runs: Most corporates run accounts payable once or twice a week. Miss the cutoff by a day and you wait another week
• Purchase order matching: If your invoice does not exactly match the original purchase order (PO) in amount, description, or line items, it gets kicked back automatically
• Procurement portals: Many government agencies and large companies require invoices to be submitted through a specific supplier portal. Email invoices are often not accepted and may go unprocessed
• Payment terms are non-negotiable (by default): Large organisations typically impose 30, 60, or even 90-day terms and expect suppliers to accept them without question
• End-of-financial-year freezes: Government agencies frequently freeze discretionary spending in the weeks before 30 June, delaying payments until the new financial year

The Australian Government Small Business Commissioner and Payment Codes

Australian governments at both state and federal level have increasingly recognised that slow payment by large organisations harms small business. Several important protections exist:

The Australian Government 20-Day Payment Policy

The Australian Federal Government has a policy of paying small business invoices within 20 calendar days (or sooner where an earlier payment date was agreed). As of 2024-25, this applies to contracts under $1 million with businesses that have fewer than 20 full-time employees.

If a federal government agency is paying you late, you can raise a complaint with the Commonwealth Ombudsman or the relevant agency’s contract management team. Simply knowing this policy exists — and citing it professionally in a follow-up — often accelerates payment significantly.

State Government Commitments

Most Australian state governments have similar commitments to pay small business suppliers promptly. Queensland, NSW, Victoria, and WA all publish supplier payment policies. Check the relevant state government procurement website for specific terms. In Queensland, for example, the government commits to paying invoices under $1 million within 25 business days.

The Business Council Payment Code

The Business Council of Australia runs a voluntary payment code where large corporates commit to paying invoices from small suppliers within 30 days. Signatories include many of Australia’s largest companies. If your corporate client has signed the code but is paying in 60-90 days, you can reference this commitment in your follow-up communications.

Before You Invoice: Laying the Groundwork

The most effective strategies for getting paid faster by large organisations happen before you send the first invoice. Invest time in understanding their process upfront.

1. Confirm the Exact Invoicing Requirements Before Starting Work

Ask these questions during or before contract signing:

• What is the correct email address or portal for submitting invoices?
• Is a purchase order number required on every invoice? If so, obtain it before starting work
• What payment terms apply, and are they negotiable for small suppliers?
• Is there a specific invoice format or template required?
• Who is the accounts payable contact, and what is their direct email?
• Are there any invoice cutoff dates (e.g., invoices must be received by the 15th to be included in that month’s payment run)?

Getting these answers early eliminates the single biggest cause of delayed payment: invoices being rejected or lost because they were submitted incorrectly.

2. Negotiate Better Terms During the Contract Stage

Many small business owners assume they cannot negotiate payment terms with a large client. This is often not true — especially if you are a specialist, a preferred supplier, or if the client values the relationship.

Approaches that work:

• Ask for Net 14 or Net 30 instead of Net 60: Frame it as a standard practice rather than a special request. “Our standard terms are 14 days. Can we align on that?”
• Request a milestone payment schedule: For longer projects, break the invoice into milestones (e.g., 30% upfront, 30% at mid-point, 40% on completion)
• Offer a small early payment discount: A 1-2% discount for payment within 7 days costs you very little and is often accepted enthusiastically by corporates focused on capturing discounts
• Get a deposit: For new engagements, a 20-30% deposit is entirely reasonable and many large organisations will agree if asked professionally

3. Set Up as an Approved Supplier Before the Work Starts

Government agencies and many large corporates have formal supplier onboarding processes. This can include ABN verification, insurance certificate submission, bank account registration, and portal account creation. Starting this process after the work is done means you cannot be paid until it is complete — adding weeks of delay.

Ask at the contracting stage: “What do I need to do to be set up in your supplier system?” and complete it before delivering your first piece of work.

How to Structure Your Invoice for Large Organisations

A poorly formatted invoice is the number one reason invoices get rejected or delayed by large organisations. Here is what every invoice sent to a government or corporate client must include:

• Your full legal business name (exactly as it appears on your ABN registration)
• Your ABN — mandatory for all Australian B2B invoices
• Invoice number — sequential and unique
• Invoice date
• Purchase Order (PO) number — must match the PO exactly. If they have given you a PO, put it prominently on the invoice
• Description of services — match the language in the PO or contract exactly. If the PO says “IT consulting services,” your invoice should say the same, not “technology advisory.”
• GST amount broken out separately — required for a valid tax invoice
• Total amount including GST
• Your bank account BSB and account number
• Payment due date (not just “30 days” — include the actual date)
• The name and email of your contact person at the client — some AP systems require this for routing

Xero generates properly formatted tax invoices automatically. Make sure your Xero organisation settings include your ABN and that each invoice template is configured to show the due date as an actual date.

Following Up Without Annoying Anyone

Following up on overdue invoices with a large client requires more diplomacy than with a small business client. You are likely dealing with an accounts payable team that processes thousands of invoices and has no personal stake in your payment. Aggression will not help. But clear, professional persistence works extremely well.

The Layered Follow-Up Strategy

Use a two-track approach: one track to accounts payable, one track to your internal champion (the person who engaged you).

Track 1 — Accounts Payable (administrative):

Track 2 — Your internal champion (relational):

Your internal champion often has more ability to escalate internally than accounts payable does. A quick nudge from them to the right person can resolve a stuck invoice in hours.

Cash Flow Protection While You Wait

Even with the best invoicing practices, working with large clients means accepting some level of payment delay. Smart Australian small businesses build cash flow buffers to manage this:

Invoice Financing and Debtor Factoring

Invoice financing allows you to receive 80-90% of an outstanding invoice’s value immediately from a lender, with the remainder (minus a fee) paid when the client settles. Major Australian providers include Timelio, Scottish Pacific, and various bank facilities. This is particularly effective for government and corporate invoices, which lenders view as low-risk.

The cost is typically 1.5-3% of the invoice value per month. For a $50,000 invoice on 60-day terms, that might cost you $750-$1,500 — a real cost, but sometimes worth it to maintain your own cash flow.

Manage Your Payment Mix Deliberately

Avoid allowing large, slow-paying clients to dominate your revenue. A common rule of thumb is that no single client should represent more than 30-40% of total monthly revenue. If a government or corporate client accounts for most of your income, their payment delays can threaten your entire business operations.

Balance large corporate work with smaller clients who pay faster (small businesses typically pay within 7-14 days when managed well) to smooth out your monthly cash position.

Use Xero Cash Flow Forecasting

Xero’s Short-term Cash Flow feature (under the Business menu) automatically projects your cash position based on outstanding invoices and bills. When you know a $30,000 government invoice will take 45 days to arrive, you can see exactly what your bank balance will look like in three weeks and plan accordingly.

Connect Xero to your bank account via bank feeds and keep your outstanding invoices up to date. The forecasting tool is only as accurate as the data you give it, but used consistently it is one of the most practical cash flow tools available to small businesses.

When to Escalate: Formal Dispute Resolution

If a large organisation consistently breaches your agreed payment terms and internal follow-up has not resolved the issue, there are formal escalation options in Australia:

• Australian Small Business and Family Enterprise Ombudsman (ASBFEO): Provides free dispute resolution assistance for small businesses dealing with larger businesses. Particularly effective for government disputes.
• Fair Trading or Consumer Affairs: State-based agencies can assist with commercial payment disputes in some circumstances
• VCAT, QCAT, NCAT, or relevant state tribunal: Small claims divisions can hear commercial disputes up to varying limits (often $25,000-$100,000) at low cost
• Statutory demand (Corporations Act 2001): For debts over $4,000, a statutory demand requires the company to pay within 21 days or risk a presumption of insolvency — this is a serious escalation step and should involve legal advice

Formal escalation is rarely necessary with legitimate government or corporate clients — they typically settle long before this point when they understand you will pursue it. The value of knowing these options is that it gives you confidence in your follow-up communications.

Building a Large Client Invoicing System in Xero

For each large government or corporate client, create a system in Xero that accounts for their specific processes:

• Client notes: Record their AP email, portal URL, PO requirements, and payment cycle in the contact notes field in Xero
• Custom payment terms per contact: Set a contact-specific due date in Xero (e.g., Net 45 for clients with 45-day terms) so your aged receivables report accurately reflects when payment is actually expected
• Invoice reference field: Use the reference field on every invoice to record the client PO number, making it easy to search and match
• Tracking categories: Consider using a Xero tracking category for “Government” vs “Corporate” vs “SME” to segment your aged receivables by client type