Most self-employed tradespeople set their day rate by looking at what competitors charge and pricing somewhere in the same range. The problem with this approach is that it assumes the competitor has done the calculation properly — which most have not.
The result is an industry where a significant proportion of sole traders are earning less than they think, not because they are not busy, but because the rate they are charging does not cover their real costs after tax.
This guide walks through how to calculate a day rate that actually works — one built from your income target, your real working days, and your genuine overheads.
Why gut-feel pricing fails
The gut-feel day rate has two problems. The first is that it does not account for the real cost of running a sole trader operation — insurance, van, tools replacement, accountant, and all the other costs that come before you see a penny of take-home pay. The second is that it is based on days worked, not on days available to bill.
These two things interact. A tradesperson who thinks they work 260 days a year and sets a rate to earn £50,000 is not accounting for the 60–90 days that disappear each year to holidays, bank holidays, sick days, quoting, admin, and non-billable travel. And they are not accounting for the £15,000–£25,000 in annual costs that need to be recovered before any of that goes home as income.
The real number, when calculated properly, is usually £50–£80 per day higher than the gut-feel rate. That is not a trivial difference. Over 180 billable days, it is £9,000–£14,000 per year.
Step 1: Your income target
Start with the number you actually want to take home. Not turnover. Not gross income. What do you want in your bank account at the end of the year, after tax?
Once you have that figure, work backwards to gross income. As a sole trader in the UK, income tax and Class 4 National Insurance will typically take 25–30% of your gross profit, depending on your total earnings and allowable expenses. So if you want £45,000 take-home, you need roughly £60,000–£65,000 gross profit before tax.
That gross profit figure is the starting point for your calculation — not the end.
Step 2: Your actual billable days
This is where most calculations go wrong. The maximum working days in a year is around 260 (52 weeks, 5 days). The actual number of days you can bill a customer for is considerably lower.
| Working Days | Deduction | Notes |
|---|---|---|
| 260 | Starting point (52 x 5) | Maximum possible, never achievable |
| -25 | Annual leave | Minimum 20 days. Most take 25–28. |
| -8 | Bank holidays (England) | 8 days per year. Scotland and Wales differ slightly. |
| -7 | Sick and contingency days | A realistic average. If you never take sick days, this still happens. |
| -40 | Non-billable time (20%) | Quoting, admin, invoicing, travel to price jobs, waiting on materials. |
| = 180 | Realistic billable days | This is the number that drives your day rate. |
180 is a reasonable estimate for a sole trader running a one-person operation. If you work with an apprentice who handles some admin, or if you have a very efficient quoting process, you might reach 200. If you do a lot of bespoke or complex work that requires more site visits per job, you might be closer to 160.
The point is that the number you use in your calculation matters significantly. Using 200 instead of 260 adds roughly £30–£50 to the minimum day rate needed to hit the same income target.
Step 3: Your annual business costs
These are the costs of operating as a sole trader that need to be recovered through your billing. They sit on top of your income target — not within it.
| Cost Category | Typical Range | Notes |
|---|---|---|
| Public liability insurance | £300–£800 | Higher for gas engineers, scaffolders, and larger projects. |
| Van insurance (business use) | £800–£1,800 | Varies significantly by age, location, and vehicle value. |
| Van running costs (fuel, servicing, MOT, tyres) | £3,000–£6,000 | Track your actual spend for three months if unsure. |
| Tools and equipment replacement | £1,000–£3,000 | Amortise major purchases over 3–5 years rather than expensing in one year. |
| Accountant or bookkeeping | £500–£1,500 | Using an accountant often saves more than the fee in tax efficiency. |
| Workwear and PPE | £300–£700 | Boots, gloves, safety kit. A genuine business cost. |
| Phone and broadband (business proportion) | £400–£800 | Typically 50–80% of total mobile and broadband bill. |
| Subscriptions and software | £200–£600 | Invoicing, quoting tools, trade directories, etc. |
| = Total overheads | £6,500–£15,200 | Use your own figures, not this range. |
Note on materials: If you supply and fit materials, your materials margin is a separate element on top of the day rate. Your labour day rate covers your time and overheads. Materials are priced at cost plus a margin of 15–25% to cover your time sourcing, collecting, and warranting them. Do not bury materials cost into your day rate — it makes quoting complex jobs harder.
Step 4: The calculation
With those three inputs, the calculation is straightforward.
The Day Rate Formula
(Target gross income + Total annual overheads) / Billable days = Minimum day rate
Example: (£62,000 gross + £10,000 overheads) / 180 days = £400 per day (labour only)
That is the floor — the minimum you need to charge to cover costs and hit your income target. On specialist or complex work, charging above the floor is appropriate.
Run that calculation with your own numbers. Most tradespeople who do it for the first time find that the result is higher than their current rate. That is normal, and it is not a reason to panic. It is information that allows you to price correctly going forward.
What to do with the number
Your calculated day rate is not what you put on every quote as a line item. Customers do not buy day rates — they buy jobs. The day rate feeds into a job-pricing process: estimate the hours required, multiply by your day rate to get labour cost, add materials at cost plus margin, add any specialist hire or subcontractor costs, and that is the job price.
The day rate is also not the ceiling. If you are a Gas Safe registered engineer being asked to do complex work that requires specialist knowledge, your rate for that work can and should be above your standard day rate. The calculation gives you a floor. Commercial judgment sets the ceiling.
What to do if your rate is below your calculated minimum
If your current rate is lower than the number you calculate, the answer is not to increase your rate overnight on every quote. The answer is to move towards the correct rate progressively, starting with new customers and new jobs.
Existing regular customers who have built expectations around a certain rate need a different approach. A direct conversation explaining that your costs have increased is usually well received by customers who value your work. Most good customers understand that tradespeople, like everyone else, have rising costs to manage.
The tradespeople who resist adjusting their rates typically do so because they are afraid of losing work. But the work they are doing at the wrong rate is costing them money. A smaller volume of properly-priced jobs produces more take-home pay than a full diary at a rate that does not cover the real cost of doing the work.
One useful test: add up all the income you received last year, subtract tax, NI, and all your business costs, and see whether the remaining take-home matches what you expected. For most tradespeople who have never done this calculation, the answer is instructive.
What the pricing calculator in The Trade Pack does
The Trade Pack includes a three-sheet Excel workbook that automates this entire calculation. Sheet 1 takes your target income and costs as inputs and calculates your true day rate. Sheet 2 is a job pricer that pulls the day rate automatically and lets you build a quote from labour hours, materials, and time — so every quote you send is built on the right number, not a guess. Sheet 3 tracks revenue and margin across six months so you can see in real time whether your pricing is delivering the income you planned for.
If you want the calculator along with the full set of proposal templates, follow-up sequences, and business documents, it is all at thetradepack.org.