Why cash payments on a building job cause trouble

Some clients offer cash. It comes up at the end of a stage, when a client wants to speed things along or avoid a bank charge, or when a relative of the client hands over an envelope and says it is for the tiler. For a builder who is short of cash on a tight month, the offer can look like a convenience. In most cases it is the start of a problem that is harder to fix than the bank transfer the client did not want to make.

The trouble with cash is not that it is illegal in every case. It is that cash leaves no trail. A bank transfer, a card payment or a cheque carries a reference, a date, an account and a record that both sides can produce. A cash payment depends on a handwritten receipt, the memory of the person who took the money and whatever the builder recorded at the time. When a dispute comes, that thin record is weak evidence for the builder who relies on it.

This article is about the business and evidence risks of accepting cash from clients, and about the wording a builder can use to decline it without losing the job. It is separate from the question of payment redirection fraud, where a criminal poses as a supplier or a client to divert a real payment. That is a different threat with a different defence. The subject here is the cash that is handed over in good faith, and the way it damages the builder’s position.

Why cash leaves the builder exposed

The builder’s protection on a building job rests on records. The contract sets out what was agreed, the invoices set out what was claimed, and the payments show what was received and when. Each piece supports the others. When a client refuses to pay the last claim, or a subcontractor says a payment was never made, those records decide the outcome. A cash payment breaks the chain at the point where the money changes hands.

That matters most in a payment dispute. Security of payment legislation in NSW gives a builder a route to recover money owed for work carried out, and the NSW Government guidance on security of payment sets out the basic framework for claims. A claim is only as strong as the evidence of the work and of what was agreed and paid. If part of the money was paid in cash and not recorded against the claim, the builder may find it harder to show what has been paid and what remains owing, and the other side will use that gap.

The same gap cuts the other way. A client who paid in cash may later say they paid more than the builder records, or that the cash was a deposit on a different job. Without a record that matches the cash to the invoice, the builder is arguing from memory against the client’s version. The builder who never accepted cash does not face that argument.

The tax and the books

Income that is not recorded is a tax problem. The Australian Taxation Office’s guidance on record keeping for business sets out the basic expectation that a business keeps the records that support its income and its expenses. Cash received from a client is income, and it has to be recorded in the same way as a bank payment. A builder who takes cash and does not record it has a gap in the books that the accountant cannot fill, and the gap is visible to anyone who compares the bank statements with the invoices.

Where the business is registered for GST, a cash sale still has to be accounted for on the same basis as any other sale, and an unrecorded cash receipt makes that return harder to get right. The books matter for more than tax. They show the business whether the work is profitable, which jobs are carrying the overheads and where the cash is going. A cash payment that never reaches the ledger distorts those figures, so the owner makes decisions on an incomplete picture. The cash that appears to help the cash flow on one job may be hiding the true cost of the business.

Large cash transactions can also attract reporting obligations and questions from the bank. The rules change, and the details depend on the amount and the circumstances, so the builder should ask the accountant rather than rely on a general rule. What is clear is that a business which regularly handles cash is more likely to attract scrutiny than one which does not, and that scrutiny is unpleasant when the records do not support the transactions.

Cash on site and the people who handle it

Cash problems often start on site rather than in the office. A client hands a sum to the site supervisor, a labourer takes an envelope from a neighbour, or a subcontractor asks to be paid in cash for a small job. Each of those payments sits outside the business records, and each one creates an obligation the builder may not have intended to take on. Who gets the money, who signs for it and where it is recorded are all questions the business has to answer.

Labour paid in cash is a particular problem. Wages, superannuation, tax withholding and workers’ rights all depend on the payments being recorded properly. A worker paid in cash has no pay slip, no record of the tax withheld and no proof of the hours worked, and that leaves both the worker and the builder exposed if something goes wrong. The builder who allows cash labour on the job is taking on that exposure without the benefit of the paperwork.

Make the rule simple for the whole crew. No one on site accepts or hands over cash for the job. Any payment from the client goes to the office by the approved method, and any payment to a subcontractor or worker goes through the business account and the payroll or invoice system. The crew should know that the answer to a cash offer is no, and that they are not expected to solve it on the spot.

The same applies to a supervisor who is handed cash by a client to pay a supplier on the spot. The supplier may give a receipt, but the business may never see the money reach its account, and the client may later say the bill was paid when it was not. That is the moment a dispute about who paid what begins, and the builder is the one who has to answer it.

The wording to decline cash without losing the client

The hardest part of declining cash is the conversation, because the client may be offering it out of kindness, habit or a wish to avoid a fee. The aim is to decline clearly, without accusing the client of anything, and to make the alternative easy. A short, friendly explanation that puts the reason on the business rather than the client works best.

A workable line is to say that the business does not accept cash on any job, that every payment is made by bank transfer or card against a written invoice, and that this keeps both the client and the builder covered if anything needs to be checked later. The reason is about the records, not about the client’s honesty, and most clients accept it without fuss.

If the client offers to pay a fee for the bank transfer, the builder can decide whether to absorb it or refuse the surcharge. The point to hold to is the method of payment, not the price of the transfer. A client who will not pay by any traceable method is a client whose payments are the business’s problem, and it is better to find that out before the work starts than during the final claim.

What to put in writing for every payment

Every payment should be tied to an invoice, a stage and a date. The invoice shows what is being claimed, the bank record shows what was received, and the link between the two shows what the payment was for. Cash breaks that link, and it breaks it at the point where the builder most needs it. A payment record that names the invoice and the stage is what makes the next claim easy to defend.

Keep the payment terms in the contract, and keep the contract with the job file. The NSW Government guidance on contracts for home building work sets out what a written agreement should cover, and the payment terms are among the most important items. A contract that says the payment is made by bank transfer against each invoice gives the builder a clear basis for declining cash and a clear basis for chasing a late payment.

Where a payment does come in unexpectedly, record it the same day. Note who paid, how much, what it was for and where the money went, and attach that note to the job file. A late note is better than none, but a note made at the time is much stronger evidence than one written after a dispute has started.

Issue a receipt for every payment, and make it worth checking later. A handwritten note with no business name, no date and no reference is a weak document. A numbered receipt that is matched to the invoice, names the stage it covers and states the balance still owing is one both sides can rely on, and a copy belongs in the job file. The balance is the figure both sides will argue about later, so put it in writing on the day.

A worked example: the cash deposit for the tiles

Consider a builder in the Illawarra who is halfway through a renovation for a family who have been pleasant to work with. At the end of a stage, the client’s father comes to the site and offers the builder an envelope of cash to pay for the tiles the client wants, saying the family would rather not go through the bank. The builder is tempted, because the money is useful and the family is friendly.

The builder declines, politely. He explains that the business does not take cash on any job, and that the tiles can be paid by bank transfer against the invoice, which he will send that afternoon. The father accepts without fuss, and the client pays the next day. The payment is recorded against the tile invoice, with the date and the stage.

Some months later, the client disputes a variation and says the tile deposit was never paid in full. Because the payment went through the bank and was tied to the invoice, the builder shows the records within minutes and the dispute is settled. The builder reflects that if the father had handed over the envelope, the argument would have been about the envelope, and the builder’s word would have been all he had.

The lesson is that a payment’s value is in the record that surrounds it. The money itself is the smallest part of the protection.

When a client insists

Some clients will keep offering cash, and some will be offended by the refusal. Hold the position calmly and keep the explanation short. Repeat that the business accepts payment by traceable methods only, and offer the alternatives again. If the client still insists on cash, record the conversation and consider whether the job is one the business wants, because a client who will not pay in a traceable way is telling the builder something about the rest of the relationship.

Do not accept cash on the basis that it is only a small amount. A small cash payment is still income, still needs a record and still sits outside the trail. The habit of accepting small amounts is how a business ends up with a large gap in its books.

There is also a fairness point. A cash arrangement can leave the client expecting a discount for paying in cash, or a quiet understanding about what the work is really worth. Those expectations are hard to unwind once they exist, and they tend to surface at the final claim. A clear, traceable payment schedule set out at the start treats every client the same and avoids side agreements that nobody wrote down.

If the cash has already been taken and the builder is unsure how to record it, speak to the accountant before the next claim is made. Getting the record straight early is much cheaper than explaining an unrecorded payment to the tax office or to a client’s lawyer later.

The bookkeeping systems for builders article covers how the records should be kept. The builder’s wider payment cycle, and how it can be structured so cash is not needed in the first place, is the subject of the progress payment article. Those decisions reduce the pressure that makes cash look attractive.

The professional development that supports good business records and sound payment practice is set out in the PointCPD guide to NSW builder CPD, and the course catalogue lists modules that cover the commercial side of running a building business.

Questions builders ask

• Cash flow
• Client Relations
• Compliance

Published 19 October 2026. General information for builders, not legal, financial or engineering advice for a specific job. Check current requirements with the relevant regulator or standard before relying on them.