Profitable but no cash: why trade businesses run out of money

TBV's £100k turnover guide covers the first gap: turnover isn't profit, and profit isn't cash. This page is about the second gap specifically, why a genuinely profitable business, even a genuinely profitable job, can still leave you short of money at the point you need it.

The short version: profit compares what a job is worth against what it cost to deliver, based on the income and costs the job generates, not on whether the cash for either has actually landed in the bank yet. Cash flow is different: it's simply money actually moving in and out of the account, in whatever order that happens. The two don't always move together. Materials often have to be paid for before the work starts. Subcontractors often want paying weekly. The customer, meanwhile, might not pay until weeks after the job is done, or after a formal invoice and payment terms have run their course. During that gap, real money can have left the business before any has come back in, on a job whose income and costs already point to a genuine profit, whether or not the cash has caught up yet.

None of these are signs of a poorly run business. They're normal features of how trade work gets paid for, and a business that understands them can plan around them; one that doesn't gets caught out by them repeatedly.

• ▸Customer payment timing: even a customer who always pays doesn't pay the moment work is done. Formal payment terms, invoice processing and simply how a customer's own accounts payable works all add real weeks.
• ▸Deposits and staged payments: a deposit or stage payment can cover some of the gap, but rarely all of it, especially on the earliest stages of a job before much has been invoiced yet.
• ▸Materials paid before receipts: a materials-heavy job can mean a large cash outlay in week one, long before the first payment for that work arrives.
• ▸Subcontractor and payroll timing: subcontractors and employees typically expect paying weekly or fortnightly, regardless of when the customer who's paying for that work actually pays you.
• ▸VAT and tax reserves: if you're VAT-registered, the VAT you charge customers contributes to what you owe HMRC on your next VAT return, netted off against any VAT you can reclaim on your own costs, so it isn't automatically the exact amount payable. What's true is that the cash sitting in your account may already be largely committed to that net VAT bill, which is why treating it as free working capital is a common way businesses get caught out. The same caution applies to money that should be set aside for Income Tax or Corporation Tax.
• ▸Retention money: on many construction contracts, a main contractor withholds a percentage of each payment until practical completion, sometimes longer. See TBV's retentions tracker for the current state of that specifically.
• ▸Slow-paying customers: even one customer paying weeks later than agreed can tie up cash that was earmarked for materials or subcontractors on the next job.
• ▸Equipment and vehicle purchases: a van or a significant tool purchase is a real cash outlay on the day you pay for it, even though it isn't necessarily treated as a same-day cost against profit.
• ▸Loan principal versus interest: repaying the capital you originally borrowed uses cash every time you make a payment, but it isn't the same thing as the actual cost of borrowing, which is the interest. A loan repayment can reduce your cash by considerably more than it reduces your profit, a specific version of the profit-versus-cash gap covered on TBV's £100k turnover guide. Exactly how loan costs are treated for tax depends on your accounting method and business structure, so check with your accountant rather than assuming a blanket rule.
• ▸Seasonal or uneven workload: quiet months don't pause insurance, van finance or software subscriptions. A strong month has to cover the gaps either side of it.
• ▸Growth itself: taking on more work, or bigger jobs, usually means paying for more materials and more subcontractor time before the bigger payments that work earns actually arrive. See "Why growth itself can make this worse" below.

• ▸Paying a supplier account for £8,000 of materials at the start of a job, then waiting weeks for the first stage payment that materials cost was meant to be covered by.
• ▸Paying subcontractors weekly for their labour on a job where the customer only pays monthly, so the business is several weeks of subcontractor wages ahead of the matching income at any given time.
• ▸A percentage of each payment withheld as retention until practical completion, sometimes released in two halves months apart, on work that was finished and paid for in every other respect.
• ▸VAT collected from a customer sitting in the business bank account, looking like available cash, when much of it may already be committed to the net amount due on the next VAT return.
• ▸A genuinely profitable extension job that still creates a real, temporary cash squeeze partway through, simply because of when its costs and its income happen to land.
• ▸Growing from one crew to two: a second crew roughly doubles the materials and labour paid out before the first payment on their combined extra work arrives, even though the extra work is itself profitable.

A £20,000 job, excluding VAT. £8,000 of materials paid for in week 1. £5,000 paid to subcontractors in week 2. The customer's stage invoice is raised in week 3, and actually paid in week 5. Once the customer pays, this leaves a £7,000 surplus after these two direct cash costs, before the business's other costs (the owner's own time, overheads, tools, insurance, tax and everything else it takes to run the business) are taken into account. Whether the job is genuinely profitable once those are included is a separate question this simplified timeline isn't built to answer; what it shows is the cash timing regardless.

More work sounds like the answer to a cash squeeze, and eventually it is, but in the short term it can be the opposite. Every new job repeats the same pattern: materials and subcontractors paid out first, customer payment landing later. Taking on two profitable jobs at once, rather than one, doesn't halve the wait for payment, it roughly doubles the amount of cash tied up in the gap at any given moment.

This is why a business can look busier and more successful, genuinely be more profitable on paper, and still feel more stretched for cash than it did at a smaller scale. Scaling up (a second crew, a bigger job, more jobs running at once) usually means the business needs a larger cash cushion to fund the gap, not just more turnover to eventually fill it.

• ▸Invoice promptly and chase overdue payment properly. See TBV's guide on what to do when a customer isn't paying for the legal position and practical steps.
• ▸Ask for a deposit or staged payments on materials-heavy jobs, so the business isn't funding the full materials cost from its own cash before any money comes back in.
• ▸Keep VAT and tax money genuinely separate, in a different account if that helps, rather than treating it as available cash until the bill falls due.
• ▸Know your retention terms before you sign, not after: how much is withheld, and when it's genuinely due back. TBV's retentions tracker covers where the law on this currently stands.
• ▸Look ahead, not just at today's balance. A simple week-by-week forecast, even a rough one, shows a cash dip coming before it arrives, which is the difference between planning for it and being surprised by it.
• ▸Be deliberate about scaling. Taking on a second crew or a materials-heavy job because the work is there is a genuine growth decision, but it's also a cash decision, worth making with the gap above in mind, not after the event.

Various forms of business finance exist specifically to bridge a cash-timing gap like the one on this page, rather than to fund losses. A business overdraft is a flexible, usually short-term buffer attached to a bank account. Invoice finance (sometimes called factoring or invoice discounting) advances a percentage of an unpaid invoice's value before the customer actually pays, secured against that invoice. A short-term business loan provides a lump sum repaid over an agreed period, usually for a more specific, planned purpose than day-to-day timing gaps.

Each comes with a genuine cost, interest and often fees, and none of them fixes an underlying pricing or cost problem if the business genuinely isn't charging enough to cover its costs, only the timing gap once the pricing itself is sound. Borrowing to bridge a genuine timing gap on real, profitable work is a different decision to borrowing to cover a job that was never going to be profitable in the first place; this page can't tell you which situation you're in, and getting that distinction right is exactly why an accountant or business adviser looking at your own figures matters more here than a general explanation can.

• ▸On your typical job, roughly how many weeks pass between paying for materials or subcontractors and being paid by the customer?
• ▸Do you know your VAT and tax liability at any given point, or only when the bill arrives?
• ▸If your two or three biggest customers all paid two weeks late at the same time, could the business cover its own costs that month?
• ▸Are you pricing in the cost of that gap, insurance, van finance, subscriptions, through quiet periods, or only through busy ones?
• ▸If you took on the next job or the next crew tomorrow, do you know how much extra cash it would tie up before it paid you back?

The worked timeline and calculator on this page are TBV's own illustrations, built to show the cash-timing mechanic, not measured, surveyed or averaged data, and not a claim about typical payment terms on any real contract.

We looked for a credible, dated UK trade-specific dataset on typical payment-timing gaps (for example, how many weeks typically pass between paying for materials and being paid by a customer) before writing this page. We did not find one publicly available: the figures most often cited in this space come from US-focused industry reports (for example Dodge Construction Network's survey work) that describe the US market, not the UK, and are not used on this page for that reason. A UK trade body, the Federation of Master Builders, publishes cash-flow guidance for builders, but it sits behind FMB membership rather than being openly available, so it wasn't something we could check or cite directly here. This is a genuine data gap TBV may look to fill with original research in future, rather than a gap this page tries to paper over with an unverifiable figure.

The handful of statutory facts stated on this page (how the VAT payable to HMRC is calculated, and how CIS deductions work) are checked directly against current GOV.UK guidance, dated below. The worked timeline and calculator show cash timing only; they are not a profit calculation, and the page is explicit about that rather than implying the illustrative surplus figure is a proven profit. The loan-repayment point is kept to the general cash-versus-cost principle, not a specific tax-deductibility claim, because the tax treatment genuinely varies by accounting method and business structure; readers are pointed to their own accountant for that. The financing section describes categories only and does not recommend, compare or link to any specific lender or product. Everything else here is general business education, not personalised financial advice.

Next review: if a credible UK trade-specific payment-timing dataset is published, to consider adding it alongside the illustrative timeline, or within 90 days of the date above, whichever comes first.