How to Budget for Your Trade Business UK — A Practical Guide (2026)

“I know roughly what I earn and what I spend.” That's how most sole traders and small trade businesses operate — and for a while, it works. Until it doesn't. A quiet January, a van repair that wasn't in the plan, or a self-assessment bill that felt bigger than expected — and suddenly the business that was ticking along just fine is scrambling. Not because it wasn't profitable. Because there was no plan.

A budget doesn't fix a failing business. But it gives a healthy one the information it needs to stay healthy — and it gives you early warning when something's going wrong. This guide walks through how to build one from scratch, as a UK tradesperson, without a finance degree.

What a budget actually is

A budget is a plan for your money: what you expect to earn and what you expect to spend. That's it. It doesn't have to be a complex spreadsheet. It can be a piece of paper with two columns — income targets and cost forecasts.

The real value of a budget isn't the plan itself — it's the comparison. Each month you compare what actually happened (actuals) to what you planned (budget). That comparison tells you whether the business is on track, where costs are creeping, and whether your revenue targets are realistic or optimistic. Without something to compare against, you're flying blind.

Step 1: List your fixed costs

Fixed costs are what you pay regardless of how much work you do. If you have a slow month and only earn £2,000, these costs still come out. They include:

• Van lease or loan repayments
• Van insurance
• Public liability insurance
• Tools or equipment finance
• Accounting software (Xero, QuickBooks, etc.)
• Mobile phone (business proportion)
• Estimated average fuel (even if it varies slightly)
• CIS registration (if applicable)
• Website hosting or lead generation subscriptions
• Any other regular monthly outgoings

Go through your bank statements and list every recurring cost. Add them up. That total is your minimum monthly overhead — the floor your revenue has to clear before you've earned a penny for yourself.

For a typical sole trader, this figure often lands between £800 and £2,500 a month depending on what you drive, what you finance, and what subscriptions you carry. Knowing this number is the starting point for everything else.

Step 2: Add your variable costs

Variable costs scale with the work you do. More jobs means more of these. They include:

• Materials (the biggest one for most trades)
• Subcontractor costs
• Additional fuel for larger or more distant jobs
• Parking and congestion charges
• Skip hire or waste disposal

Materials are usually the most significant variable cost. For most tradespeople, materials sit somewhere between 20% and 40% of revenue — meaning if you invoice £5,000 in a month, you'll spend £1,000 to £2,000 on materials. If you charge separately for materials (and you should), this ratio tells you whether your pricing is covering costs properly.

Estimate your variable costs as a percentage of your expected revenue. Don't try to predict them precisely — a rough percentage is accurate enough for planning purposes.

Step 3: Set your revenue target

Now you know what it costs to run the business. Add up fixed costs + estimated variable costs, then ask: how much do I actually need to earn? Work through these layers:

1. Cover fixed costs — the absolute minimum
2. Cover variable costs — which scale with revenue
3. Pay yourself — what drawings do you need to live on?
4. Put aside for tax — 25–30% of net profit
5. Save for quiet periods — even a small buffer changes everything

Add those up and you have your minimum revenue target. Then add 10–15% headroom on top. Targets set at the minimum leave no margin for error — and in a trade business, there's always something.

Step 4: Break it down by week or month

An annual revenue target of £80,000 is abstract. £6,667 a month is more real. £1,538 a week is the number that actually drives behaviour on a Monday morning.

Break your target into the smallest unit that matches how you work. If you charge by the day, that's billable days per week multiplied by your day rate. If you work on fixed-price jobs, it's average job value multiplied by jobs completed per month. Either way, make the target specific enough that you know by mid-month whether you're on track — not on 28 December.

Step 5: Account for seasonality

Most trade businesses don't have flat revenue across 12 months. Landscape gardeners and decking fitters are busier in spring and summer. Heating engineers are flat out from September through November. January is slow for almost everyone.

A realistic budget reflects this. Set higher revenue targets for your naturally busy months and lower targets for your quiet ones. This does two things: it stops you feeling behind in January when revenue is genuinely low, and it reminds you to reserve cash during busy periods rather than spending it as it comes in.

If you've been trading for more than a year, look back at your bank statements and identify your seasonal pattern. If you're newer, use common sense for your trade and revisit the budget after 12 months of data.

The tax pot — do this now

This is the one that causes the most pain for tradespeople who don't budget. The self-assessment bill arrives in January and it's larger than expected because the money was spent over the previous 12 months without anything set aside.

The fix is mechanical: every time money comes into your business account, immediately transfer 25–30% of it to a separate savings account. Not a pot in the same account — a separate savings account you don't look at. Label it “Tax.” Never spend it on anything else.

25% of net profit is the rule of thumb for a sole trader paying Income Tax and Class 4 National Insurance at the basic rate. If your profits are higher — over the higher rate threshold (£50,270 in 2026/27) — you'll need closer to 40%. When in doubt, save more. HMRC will hold a refund; they won't forgive a shortfall without charging interest.

The monthly review — 15 minutes, once a month

Once the budget is set, the work is in the review. Pick a date each month — the 1st, the last Friday, whatever you'll actually stick to — and spend 15 minutes on three questions:

1. Did I hit my revenue target this month? If not, why not?
2. Are my costs in line with what I budgeted?
3. How much tax have I set aside vs what I'll owe?

That's the full review. You don't need more than that to keep the business on track. If revenues are consistently below target, you have a pricing or pipeline problem. If costs are consistently above budget, something has crept in that needs cutting. The review surfaces both.

Cash flow vs profit — they're not the same thing

You can run a profitable business and still run out of cash. This catches tradespeople out constantly. Profit is the difference between revenue and costs over a period. Cash flow is whether money is in your account when you need to pay something.

Common cash flow pressure points in trade businesses:

• Commercial clients with 30–60 day payment terms — you've done the work but the money isn't there yet
• Materials purchased upfront before an invoice is raised
• A large job that spans months where staged payments aren't agreed
• Slow months where fixed costs still need paying

A cash flow forecast — a simple week-by-week view of expected income and expected outgoings for the next three months — is the tool for managing this. It's not the same as a profit forecast. It tells you when you'll have money and when you won't, so you can plan accordingly: delay a purchase, chase an invoice earlier, or arrange an overdraft before you need it rather than when you do.

Build a working capital buffer

The target is one to two months' worth of fixed costs sitting in your business account at all times. Not to be spent on operations — just there. This is your cushion against a slow month, a client who pays late, or a job that gets cancelled at short notice.

If you don't have this yet, build it gradually. Save a small percentage — even 5% — of every payment that comes in and move it to a separate pot. After six months of consistent saving you'll have something meaningful. The goal isn't to hoard cash; it's to stop a bad month becoming a crisis.

The simplest way to start today

If a spreadsheet feels like too much to begin with, there's a simpler approach that costs nothing and works immediately. Open a business bank account that supports sub-accounts or “pots” — Starling Business, Monzo Business and Tide all offer this for free. Then set up automatic transfers whenever money comes in:

• 25% to a “Tax” pot — off limits until your self-assessment bill
• 10% to a “Quiet Months” pot — your working capital buffer
• The remaining 65% stays available — for materials, fixed costs, and drawings

This is a budget in its most basic form. You're not tracking every line item — you're ring-fencing the money that needs to be protected and operating on what's left. For many tradespeople, this alone transforms how the business feels to run. The tax bill stops being a shock. Quiet periods stop being emergencies. You know where you stand.

From there, layer in more detail as you get comfortable: a monthly revenue target, a cost breakdown, a cash flow forecast for the next 90 days. The goal is always the same — more information, earlier, so you can make better decisions.