Your billable rate equals your total annual costs divided by your annual billable hours, plus a profit margin. Get the formula wrong and you either leave money on the table or price yourself out of work entirely.
Setting a billable rate is one of the most consequential decisions in any professional services business, yet most freelancers and firms rely on gut feel or a quick glance at competitor pricing. A structured calculation grounded in your actual costs, realistic utilisation targets, and an honest look at the market you sell into produces a rate you can defend to clients and sustain profitably. This guide walks through the full calculation step by step, shows how to sanity-check the result against the market, and covers how to adjust your rate when AI tools change your delivery economics.
Components of a Billable Rate
Before running numbers, you need to understand every cost that your billable rate must cover. Missing a component here means undercharging — sometimes significantly.
Direct labour costs. For employed staff, this is salary plus employer National Insurance contributions. For freelancers, it is your target personal income — the amount you need to draw from the business.
Overhead allocation. Rent, utilities, professional software subscriptions, insurance, accounting fees, training, and any other cost of running the business that is not directly attributable to a specific client project. The worked examples below use £7,500 for a solo freelancer and 50–65% of salary for an agency as illustrative assumptions; your own accounts are the only reliable source for this figure.
Benefits and taxes. Employer pension contributions, professional indemnity insurance, and self-employment taxes or corporation tax provisions. In the UK for 2026/27, employer Class 1 National Insurance is 15% of each employee’s earnings above the secondary threshold of £5,000 a year (GOV.UK rates and thresholds for employers); check the current figures each April, because they change.
Desired profit margin. The return on the business above covering all costs. The margin is a business decision, not a benchmark; the worked examples below use 20–35% as illustrative assumptions.
Non-billable time adjustment. No one bills 100% of their working hours. Administrative tasks, business development, training, and internal meetings all consume time. This is captured through the utilisation rate, and it is the single biggest factor most people underestimate when setting rates.
The difference between cost rate and billing rate is critical. Your cost rate is what each hour actually costs you to deliver. Your billing rate is your cost rate plus profit margin. Confusing the two leads to razor-thin margins or losses on projects that look profitable on paper.
Step-by-Step Billable Rate Calculation
The core formula is straightforward:
Billable Rate = Total Annual Costs / Annual Billable Hours / (1 - Profit Margin)Here is how to apply it in five steps.
Step 1: Calculate your total annual costs. Sum your direct labour costs, overheads, benefits, and taxes. This is your fully loaded cost base.
Step 2: Determine your available working hours. Start with 52 weeks, subtract holidays and bank holidays. In the UK, a typical professional works around 1,760 hours per year (220 working days at 8 hours, accounting for 28 days of leave including bank holidays).
Step 3: Estimate your billable utilisation rate. This is the percentage of available hours you can realistically bill. If you have tracked time, use your own recorded utilisation; it is the one input you can measure rather than assume. The worked examples below use 65–78% as illustrative assumptions. For more on calculating this figure, see how to calculate your billable hourly rate.
Step 4: Calculate your billable hours. Multiply available hours by your utilisation rate. This is the denominator in the formula.
Step 5: Add your profit margin. Divide the cost per billable hour by (1 minus your target margin).
Worked Example 1: Solo Freelance Consultant
| Component | Amount |
|---|---|
| Target personal income | £55,000 |
| Tax and National Insurance provision (illustrative assumption) | £8,500 |
| Overheads (software, insurance, co-working) | £7,500 |
| Total annual costs | £71,000 |
| Available working hours | 1,760 |
| Utilisation rate | 65% |
| Annual billable hours | 1,144 |
| Cost per billable hour | £62.06 |
| Target profit margin | 20% |
| Billable rate | £77.58/hr |
Rounded to a clean number: £80/hr.
Worked Example 2: Small Agency (Per-Consultant Basis)
| Component | Amount |
|---|---|
| Employee salary | £45,000 |
| Employer NI (15% above the £5,000 secondary threshold, 2026/27) | £6,000 |
| Pension contribution (illustrative 5%) | £2,250 |
| Overhead allocation (illustrative 50% of salary) | £22,500 |
| Total annual costs per consultant | £75,750 |
| Available working hours | 1,760 |
| Utilisation rate | 72% |
| Annual billable hours | 1,267 |
| Cost per billable hour | £59.79 |
| Target profit margin | 30% |
| Billable rate | £85.41/hr |
Rounded: £86/hr or positioned at £90/hr for a clean figure. The NI line uses the 2026/27 employer rate and threshold; the pension and overhead percentages are assumptions for the example.
Worked Example 3: Enterprise Management Consultant
| Component | Amount |
|---|---|
| Employee salary | £85,000 |
| Employer NI (15% above the £5,000 secondary threshold, 2026/27) | £12,000 |
| Pension and benefits (illustrative) | £8,500 |
| Overhead allocation (illustrative 65% of salary) | £55,250 |
| Total annual costs | £160,750 |
| Available working hours | 1,760 |
| Utilisation rate | 78% |
| Annual billable hours | 1,373 |
| Cost per billable hour | £117.08 |
| Target profit margin | 35% |
| Billable rate | £180.12/hr |
Rounded: £180/hr.
Sanity-Checking Your Rate Against the Market
A calculated rate tells you what you need to charge. It does not tell you what the market will pay, so the next step is to compare it with figures you can date and cite for your own sector and seniority. Published rate tables go stale quickly and rarely say how they were gathered, which is why this guide does not reproduce one.
Useful sources, in rough order of reliability:
- Professional-body rate guides and surveys for your discipline, such as the Management Consultancies Association for consulting, the Law Society for legal work, or RICS for surveying. Note the survey date and sample.
- Recruiter and salary surveys (Robert Half, Hays and similar), which report day rates for contract roles and are refreshed annually.
- Freelance platforms, where rates are visible but skew towards the lower end of the market.
- Your own pipeline: the rates on proposals you have won and lost are the most relevant data you own.
Location and the client’s market matter. Rates differ between regions and countries, and remote-first firms increasingly price to the client’s market rather than their own. Research the market you sell into rather than assuming a fixed premium or discount.
If your calculated rate falls well below what your research suggests for your seniority and specialism, your costs may be underestimated — revisit your overhead allocation. If it sits well above, make sure you can articulate the premium through specialisation, track record, or unique capabilities.
Adjusting Your Rate for Experience and Market Position
The calculated rate is a floor, not a ceiling. Several factors justify charging above the benchmark.
Specialisation commands a premium. A generalist management consultant and a specialist in post-merger integration operate in different markets. Deep expertise in a niche with strong demand supports a rate well above a generalist’s.
Track record and reputation. Demonstrable results — case studies, testimonials, repeat clients — reduce the buyer’s perceived risk. Lower risk justifies higher rates.
Pricing models beyond hourly rates. Retainer arrangements, fixed-price projects, and value-based pricing all decouple your revenue from hours worked. A retainer at £5,000/month for a defined scope may yield a higher effective hourly rate than billing at £90/hr with variable hours. Consider the pricing model as part of rate-setting, not separate from it.
Raising rates with existing clients. Give 60–90 days’ notice. Tie the increase to specific improvements in your capability or deliverable quality. Annual rate reviews should be standard practice — costs increase every year, and your rate should keep pace.
Setting Rates for AI-Augmented Services
AI tools are changing delivery economics for professional services. If you use AI agents to accelerate research, drafting, code generation, or analysis, your effective cost per deliverable has likely fallen — but your billable rate strategy needs to account for this carefully.
The productivity paradox. AI makes you faster. If you bill hourly and complete work in half the time, your revenue halves. This is the core argument for re-examining your pricing model when AI tools become a meaningful part of your workflow.
Value-based pricing for AI-enhanced work. The strongest approach is to price based on the value of the deliverable to the client, not the hours consumed. A market analysis that previously took 40 hours and now takes 15 (with AI assistance) is worth the same to the client. Price accordingly.
Blended rates for human and AI hours. When hourly billing is unavoidable, consider a blended rate that combines human and AI agent costs into a single figure. This avoids the awkward conversation about charging for AI time while maintaining transparency about how work is delivered.
Tracking AI agent time and cost. You cannot set an accurate rate for AI-augmented services without knowing what those services actually cost to deliver. This means tracking both human time and AI agent time on every project — not just for billing, but for rate-setting accuracy.
Key Takeaway
Your billable rate = total annual costs / annual billable hours / (1 - profit margin). Use a realistic utilisation rate (not 100%), sanity-check the result against sources you can cite for your sector and seniority, and recalculate whenever your cost base or delivery model changes — especially as AI tools shift your productivity.
Calculate Your True Billable Rate
Want to run the numbers interactively? Use the free freelance rate calculator to model hourly rates, day rates, expenses, and billable time. Its reserve percentage is a planning assumption you set, not a tax calculation, so check your actual tax position separately.
Keito tracks human and AI agent time so you can set rates based on real data, not guesswork.
Frequently Asked Questions
How do I calculate my billable rate?
Calculate your total annual costs (salary or target income, overheads, taxes, and benefits), then divide by your annual billable hours (available working hours multiplied by your utilisation rate). Finally, divide that figure by (1 minus your target profit margin). For example, if your costs are £71,000, your billable hours are 1,144, and your target margin is 20%, your billable rate is £71,000 / 1,144 / 0.80 = approximately £78/hr. The utilisation rate is the most commonly underestimated variable, so use your own tracked hours rather than a guess.
What is a good billable rate for a consultant in the UK?
There is no universal good rate. Start from your own cost base and utilisation, then compare the result with sources you can date and cite for your sector, such as professional-body rate guides, recruiter salary surveys and the rates visible on freelance platforms. Treat any published range as a sanity check rather than a target, and expect location, specialism and seniority to move it substantially.
What is the difference between cost rate and billable rate?
Your cost rate is what each hour of work actually costs your business to deliver, including salary, overheads, taxes, and benefits divided by billable hours. Your billable rate is the cost rate plus a profit margin. If your cost rate is £60/hr and your target profit margin is 25%, your billable rate is £60 / 0.75 = £80/hr. The cost rate tells you the minimum you can charge without losing money. The billable rate is what you actually charge clients.
How often should I review my billable rate?
Review your billable rate at least annually, and recalculate whenever your cost base changes materially — such as a rent increase, a new hire, or a significant change in your utilisation rate. Firms adopting AI tools should review more frequently, as AI can substantially alter delivery costs and productivity within a single quarter. Build a rate review into your annual business planning cycle, and track your actual utilisation and costs monthly so the review is based on real data rather than estimates.
Should I lower my rate when I use AI tools?
Not automatically. AI tools reduce your delivery costs, but the value of the deliverable to the client has not changed. If a financial model that previously took 20 hours now takes 8 hours with AI assistance, the client still receives the same value. The strongest approach is to maintain or increase your rate while delivering faster, capturing the productivity gain as improved margin. If you bill hourly, consider shifting to value-based or fixed-price arrangements so that your revenue is not penalised by increased efficiency. For a structured approach to pricing AI-augmented services, see the blended rate framework.