Deposits, Payment Terms, and Getting Paid on Time: A No-Nonsense Guide

Cash flow kills more businesses than lack of work ever will. You can be profitable on paper and bankrupt in practice. It happens all the time. A plumber quoted £4,000 for a bathroom refit. They hit their margin targets. The job is profitable. But the customer won't pay until completion, the materials cost £2,000 upfront, and the plumber has to wait 30 days for the final invoice to be paid. That's 30+ days of funding materials and labour from their own pocket. Do two or three jobs like that simultaneously and suddenly they can't make payroll. Profitable business. Bankrupt owner.

Most UK tradespeople are essentially operating as banks. You fund the entire job upfront—materials, labour, travel, overheads—and then wait for the customer to pay. Sometimes they pay fast. Sometimes they don't. Sometimes they dispute the invoice. Meanwhile, your bills are due now. Your staff need wages now. Your suppliers need payment now. The cash flow gap is where most small businesses die.

The solution isn't complicated. It's uncomfortable, but it's not complicated. You need to shift the cash flow dynamic so the customer, not you, is funding the job.

The Deposit: Your First Defence Against Cash Flow Crisis

The most powerful word in your business is "deposit." A deposit is money from the customer before you start work. It covers your risk. It covers the cost of materials you're about to buy. It covers your commitment.

A good deposit structure looks like this: 50% deposit before starting any work. This covers materials, travel, and the initial labour commitment. The other 50% is paid on completion.

Why 50%? Because it's substantial enough to be meaningful without sounding unreasonable to customers. If a customer balks at paying 50% upfront for a £4,000 job, they're signalling something: either they don't have the money, or they're not serious, or they're the type of customer who disputes invoices. None of these are customers you want.

Customers who are serious and have money will pay a 50% deposit without flinching. It's normal in the trades. They expect it. If they're surprised by it, they're either new to hiring tradespeople or they're problem customers. Either way, a deposit filters them before you've invested time and materials into the job.

For larger jobs, a 30-40-30 structure works well: 30% to start, 40% at midpoint (when major materials are purchased or significant work is complete), 30% on completion. This spreads the risk and keeps you funded throughout the project without requiring the customer to fund the entire job.

Materials: Why You Should Never Buy From Your Own Pocket

Here's a hard rule: the customer pays for materials 100% upfront, or you don't buy them yet. This is non-negotiable. You should never be out of pocket for materials.

Why? Because materials are the customer's risk, not yours. If they change their mind about the specification, the materials go back. If the job gets cancelled, the materials are theirs to dispose of. If they dispute your invoice, the materials are still sitting at their property. Materials are their liability, so they should pay for them.

How you position this matters. Don't say "you have to pay for materials upfront." Instead, say: "Once you approve the specification and provide the materials payment, I'll order everything and get started right away."

Some customers will push back. "Can't you buy them and I'll reimburse you?" No. You don't have a £2,000 float for every job. Your cash flow doesn't work that way. This isn't personal—it's how you operate.

A few customers will refuse. Those customers are signalling that they're either broke or they're the type to dispute charges. Let them go. You don't want them.

Here's the language that works in a quote or conversation: "Payment for materials is required before I place the order. This ensures we get the exact specification you've approved and keeps the project timeline on track."

Payment Terms: Setting Expectations From Day One

Clear payment terms prevent most disputes. Most late payments happen because the customer wasn't sure when they were supposed to pay. Be explicit.

Your invoice should include this line: "Payment due on completion of work. Cheque or bank transfer accepted." Don't offer 30-day terms. Don't say "net 30." You're a tradesperson, not a corporation. You need cash to operate. You offer completion payment or deposit + completion. That's it.

If a customer asks for 30-day terms, your answer is: "I require payment on completion so I can pay my suppliers immediately and fund the next job. I can offer a small discount for payment within 7 days of invoice if that helps with your cash flow."

For larger projects, a retention clause can work: "Final 5% of invoice retained for 30 days after completion to ensure all works are satisfactory." This gives them a small leverage point (they can withhold 5%) if there's a snag, and it gives you time to fix anything without chasing payment. After 30 days, retention is due in full.

Here's a complete payment terms section you can use in your contracts and quotes:

What to Do About Late Payers

Despite clear terms, some customers will still pay late. Here's how to handle it:

The First Reminder (7 Days Late)

Send a polite reminder: "I notice payment for [project] hasn't been received yet. The invoice was due on [date]. Could you let me know when I can expect payment? Feel free to call if you have any questions."

Many late payments are simple oversights. A friendly reminder solves most of them.

The Second Reminder (14 Days Late)

More formal tone: "Payment for [project] is now 14 days overdue. I've sent a previous reminder on [date]. I need payment by [specific date—7 days out] to avoid having to suspend any further work or recommendations. Please arrange payment today or contact me to discuss."

The Final Notice (21 Days Late)

This is the legal notice: "Your account is 21 days overdue. Payment must be received by [specific date—3 days out]. If payment is not received, I will be forced to pursue this through small claims court and legal fees will be added to the debt. I will also not be able to provide further services or recommendations until this is resolved."

Most people pay when they see "small claims court" in writing. It suddenly becomes real.

The Extreme Case (30+ Days Late)

If someone is 30+ days late and refusing to pay, you have options: small claims court (costs about £150-300 to file depending on the amount), debt collection agency (they take a percentage but handle the chasing), or write it off and move on.

Before you reach this point, you should have screened the customer better. Ask for references. Check their online reviews. If they've been sued by other tradespeople, there will be evidence online. Trust your gut. If something feels off, walk away.

The Psychology of Money: Why This Matters

Here's what most tradespeople get wrong: they think demanding upfront payment or clear terms makes them sound greedy or unprofessional. It doesn't. It makes you sound organised and professional.

Customers who are serious about their project respect clear terms. They expect it. They understand that you're running a business. If anything, unclear payment terms signal weakness. It signals you haven't thought through how your business works.

The deposits, the payment terms, the late payment procedures—these aren't about being difficult. They're about protecting your business from the cash flow crisis that kills tradespeople every year.

Profit vs. Cash Flow: The Critical Distinction

This is the distinction that saves businesses: profit is not the same as cash flow. You can be profitable and still run out of cash. This happens when you've invoiced for work (profit) but haven't been paid yet (cash flow).

Example: You complete a £10,000 kitchen refit with 50% margin. You've made £5,000 profit. But the customer pays on day 45, and your supplier needed payment on day 15. For 30 days, you were out of pocket £10,000. If you're running multiple jobs simultaneously, you could need £30,000-£50,000 in working capital just to cover the gap between spending and receiving cash.

Deposits solve this. If the customer pays 50% upfront (£5,000), you can pay your supplier immediately. You're no longer out of pocket. Your cash flow works. You're not financing the customer's project—they are.

Clear payment terms and a robust deposit policy aren't about being tough. They're about survival.