How to get invoices paid on time

Late payment is the most common cash-flow problem in small business, and the most commonly misdiagnosed. It gets treated as a relationship issue - the customer is difficult, or you’re bad at chasing - when it’s almost always a process issue on both sides.

Most invoices aren’t paid late out of malice. They’re paid late because nobody on the other end had a reason to prioritise this one, and nobody on your end followed up until it was awkward. Both of those are fixable without a single uncomfortable conversation.

General information, not tax advice. The ATO is the authority - see ato.gov.au or ask a registered tax or BAS agent.

Late payment is a cash-flow problem, not an income problem

A profitable business can fail from late payment alone. If you invoice $15,000 a month and your customers average 60 days, you’re carrying $30,000 of work you’ve already paid for - materials, subcontractors, your own time - while waiting to be paid for it. Your profit and loss looks healthy and your bank account doesn’t.

This is why chasing invoices isn’t petty. The gap between issuing and being paid is money you have lent, interest-free, to a business that didn’t ask your permission.

Set the terms before the work starts

Almost everything that goes wrong at invoice time was decided before the job began.

Agree payment terms in writing, in the quote. Not in conversation. The quote is where terms belong, because it’s the document the customer approves - and approving it means accepting them. If your terms first appear on the invoice, they’re a request. On an accepted quote, they’re part of the deal. See how to write a quote that wins work for what else belongs in that document.

Choose a specific number of days, and make it short. 14 days is a reasonable default for most small businesses. 30 is standard for larger commercial customers. “On receipt” sounds firm but is worse than either, because it doesn’t create a deadline anyone can put in a calendar.

Take a deposit on anything substantial. 30–50% up front is normal in most trades and in project-based professional work. A deposit does two things: it funds the materials and time you’re about to spend, and it tells you something about the customer. A client who won’t pay a deposit on a $12,000 job is showing you exactly how the final invoice will go.

Invoice progressively on long jobs. Waiting until a three-month project is finished to send one large invoice means you carry the whole cost and then discover any payment problem at the worst possible moment. Bill at agreed milestones instead. Each payment confirms the relationship is still working.

Find out how they actually pay. Larger organisations have processes: a purchase order number, a specific email address for invoices, a cut-off date for the monthly payment run. An invoice that misses the run by one day waits another month, and no amount of following up changes that. Ask during the quoting stage - “who should invoices go to, and do you need a PO number?” - and you’ll avoid the majority of administrative delays.

Invoice immediately

The single highest-leverage change available to most small businesses: send the invoice the day the work is done.

Every day between finishing and invoicing is a day added to your payment cycle at the front, where it’s invisible. It also compounds - an invoice sent nine days late doesn’t just arrive nine days late, it can miss a payment run and arrive a month late. And the customer’s memory of the value you delivered is strongest immediately after you deliver it.

If you’re routinely invoicing days after finishing, that’s usually a workflow problem rather than a discipline one. Anything that removes the friction - a quote that converts straight into an invoice, an invoice you can issue from your phone in the van - pays for itself quickly. Make sure what you send is actually compliant, too - see what must be on an Australian tax invoice.

A follow-up sequence that isn’t awkward

The reason chasing feels uncomfortable is that people leave it until they’re annoyed, then write the email in that state. A sequence removes the decision, and therefore the emotion. Each step is routine and expected, not a judgement about the customer.

Three days before the due date - a reminder. Short, friendly, no implication of wrongdoing. “Hi Sam, just a reminder that invoice #1043 for $2,400 is due this Friday. Details are attached.” This one email prevents a surprising share of late payments, because a large fraction of lateness is simply that the invoice was filed and forgotten.

The day after it’s due - a nudge. Still assume it’s an oversight, because it usually is. “Hi Sam, invoice #1043 was due yesterday - could you let me know when it’s scheduled? Happy to resend if it’s gone astray.”

Seven days overdue - get specific. Ask a direct question that requires an answer. “Can you confirm the date this will be paid?” is much harder to leave unanswered than “just following up”. This is also the point to check the invoice actually reached the right person, and whether anything is blocking approval.

Fourteen days overdue - pick up the phone. Email is easy to ignore; a call is not. It’s also where you find out what’s really happening - a missing PO number, a dispute nobody told you about, or genuine cash-flow trouble. All three are better known than guessed at.

Thirty days overdue - a formal letter. Written, referencing the invoice, the amount, the terms that were agreed, and a clear final date before you escalate. Keep it factual and unemotional. This is the document you’d rely on later.

Beyond that - escalate. A letter of demand, a debt collection service, or the small claims tribunal in your state, depending on the amount. Most matters never get here, but the sequence being consistent is part of why.

The point of writing this down is that you can then run it without deliberating each time. The follow-ups happen on a schedule rather than when you get frustrated enough - which means they happen earlier, sound calmer, and work better.

Automate the routine parts

Everything before the phone call is mechanical: check what’s overdue, send a templated message with the right details. That’s exactly the kind of task that gets skipped when you’re busy, and you’re busiest precisely when cash flow matters most.

If your system tracks due dates and sends the reminders itself, the first three steps happen without you thinking about them, and your attention goes only to the invoices that genuinely need a human. That’s the difference between chasing being a task you dread and it being something that’s simply handled.

What to do about persistent late payers

Some customers are structurally slow - they pay everyone at 60 days regardless of terms, and no follow-up sequence will change a payment run that runs monthly.

You have three honest options. Price it in: a customer who pays at 60 days costs you more to serve than one who pays at 14, and your pricing can reflect that. Change the terms: larger deposits, progressive billing, or payment before delivery. Or stop working with them, once you can afford to.

What doesn’t work is absorbing it indefinitely while feeling aggrieved. If a customer’s payment behaviour is a known fact, it’s a business input like any other cost, and you get to decide what to do about it.

Some things to stop doing

Stop discounting for early payment without doing the arithmetic. “2% off if paid in 7 days” sounds harmless and is an expensive line of credit. On a 30-day term, that’s roughly a 36% annualised cost. Sometimes it’s worth it; do the sum first.

Stop treating charging interest as automatic. You can charge interest on overdue accounts, but only if it was agreed in the terms the customer accepted. Adding it to an invoice unannounced is unenforceable and reads as retaliation. Put it in the quote or don’t use it.

Stop starting new work for a customer with an overdue invoice. This is the most common way a $3,000 problem becomes a $9,000 one. Finish what’s committed, then pause. A customer who values the relationship will sort out the invoice; one who doesn’t has just told you something useful while you still have limited exposure.