If you sell your expertise – whether as a consultant, accountant, solicitor, designer, architect, or any other professional service – understanding your true profitability requires knowing exactly where your time goes.

Many professional service providers know their total revenue and overall profit, but they can’t tell you which clients or projects are actually making money and which are secretly losing it.

This blind spot leads to:

• Keeping unprofitable clients because they seem busy
• Underpricing proposals because you underestimate effort
• Working harder for less profit
• Saying yes to the wrong work

The solution is systematic time tracking and project profitability analysis. Let’s look at how to implement this and what insights it reveals.

Why Time Tracking Matters

In professional services, time is your inventory. It’s what you’re selling.

For product businesses: Buy widgets for £5, sell for £10, profit is clear.

For professional services: Spend 10 hours on a project, charge £2,000, but what’s your actual profit?

Without knowing your hourly cost, you can’t answer this question.

Time tracking tells you:

• Whether projects are profitable
• Your effective hourly rate
• Which clients consume disproportionate time
• Where you’re spending non-billable time
• How accurate your project estimates are
• Which services are most profitable

Calculating Your Hourly Cost Rate

Before you can assess project profitability, you need to know what an hour of your time costs your business.

The formula:

Total Annual Costs ÷ Available Billable Hours = Hourly Cost Rate

Step 1: Calculate total annual costs

Include everything:

• Your salary (or drawings if sole trader, plus NI and tax)
• Other staff salaries plus employer NI
• Rent and rates
• Software and subscriptions
• Professional indemnity insurance
• Accountancy and legal fees
• Marketing and advertising
• Equipment and depreciation
• Utilities, phones, internet
• Professional development
• All other overheads

Example: Total annual costs: £120,000

Step 2: Calculate available billable hours

Start with: 52 weeks × 40 hours = 2,080 hours

Subtract:

• Holidays: 28 days × 8 hours = 224 hours
• Bank holidays: 8 days × 8 hours = 64 hours
• Sick days (estimate): 5 days × 8 hours = 40 hours
• Training/development: 10 days × 8 hours = 80 hours

Available working hours: 2,080 – 408 = 1,672 hours

But not all working hours are billable:

• Administration and emails
• Business development and marketing
• Internal meetings
• Proposals and pitches (unpaid)
• Professional development

Realistic billable percentage: 60-75% for most professional services

Billable hours: 1,672 × 70% = 1,170 hours

Step 3: Calculate hourly cost rate

£120,000 ÷ 1,170 hours = £102.56 per hour

This is what each hour costs your business, not what you charge clients.

Setting Your Hourly Charge Rate

Now you know your cost rate, what should you charge?

Your charge rate must cover:

• Your cost rate
• Profit margin
• Risk and uncertainty

Formula: Hourly Charge Rate = Cost Rate ÷ (1 – Target Profit Margin)

Example:

• Cost rate: £102.56
• Target profit margin: 25%
• Charge rate: £102.56 ÷ 0.75 = £136.75

Round to £140 per hour

Checking different margin targets:

Most professional services target 20-40% net profit margins.

Market reality check:

Your calculated rate might not match market rates. If the market pays £100/hour but your cost rate is £103, you have a problem:

• Reduce your costs
• Improve efficiency (more billable hours)
• Specialise in higher-value work
• Accept lower margins temporarily while building reputation

Time Tracking Best Practices

Tools range from:

• Simple spreadsheets
• Dedicated time tracking apps (Toggl, Harvest, Clockify)
• Full practice management software
• Built-in features in accounting software

What to track:

Every time entry should include:

• Date
• Client/project
• Task/activity description
• Hours spent (or start/stop times)
• Billable or non-billable
• Notes (optional but helpful)

Example entry:

• Date: 15/02/2025
• Client: ABC Ltd
• Project: Annual accounts
• Task: Reviewing bank statements
• Time: 2.5 hours
• Billable: Yes
• Rate: £140/hour

Categorise non-billable time too:

• Admin
• Marketing
• Business development
• Training
• Internal meetings
• Proposals (specify client)

This shows where non-billable time goes and whether it’s justified.

Daily Time Tracking Habits

Track time contemporaneously – don’t try to reconstruct your week on Friday afternoon.

Techniques that work:

1. Timer method Start timer when beginning a task, stop when finished. Requires discipline but very accurate.

2. Block method
Block time in 15-30 minute increments. “9:00-10:30 Client A, 10:30-12:00 Client B”

3. End-of-day review Review your calendar and reconstruct the day. Less accurate but better than nothing.

4. Automatic tracking Some software tracks application usage and prompts you to categorise time. Can work for computer-based work.

The key: Make it a habit. Five minutes at the end of each day is easier than trying to remember last week.

Analysing Project Profitability

Once you’re tracking time, you can analyse whether projects are profitable.

Project profitability formula:

Revenue – (Hours Spent × Cost Rate) – Direct Expenses = Project Profit

Example 1: Profitable project

• Revenue: £5,000
• Hours spent: 30 hours
• Cost rate: £102.56/hour
• Costs: 30 × £102.56 = £3,077
• Direct expenses: £100
• Profit: £1,823 (36% margin)

This project was profitable.

Example 2: Unprofitable project

• Revenue: £3,000 (fixed price)
• Hours spent: 45 hours (scope creep)
• Cost rate: £102.56/hour
• Costs: 45 × £102.56 = £4,615
• Direct expenses: £50
• Loss: -£1,665

You lost money on this project.

What the second example reveals:

• You underestimated effort
• Scope wasn’t controlled
• Fixed price didn’t account for complexity
• Client was more demanding than anticipated

Common Profitability Killers

1. Scope Creep

Project expands beyond original agreement without additional fees.

Example:

• Agreed scope: 20 hours
• Actual time: 35 hours
• Additional hours: 15 × £102.56 = £1,538 cost absorbed

Prevention:

• Clear scope in proposal
• Track changes and charge for additions
• Communicate when approaching scope limits
• Include change request process

2. Inefficient Processes

Tasks taking longer than necessary due to poor systems.

Example: Annual accounts taking 15 hours when streamlined process would take 10 hours.

Extra 5 hours × £102.56 = £513 lost per client

Solutions:

• Standardise processes
• Use templates and checklists
• Invest in better software
• Train staff properly

3. Poor Project Estimation

Consistently underestimating effort needed.

Fix this by:

• Tracking actual time on completed projects
• Building an estimation database
• Adding buffer for unknowns
• Learning from past mistakes

4. Low-Value Clients

Some clients consume disproportionate time relative to fees.

Identify these by:

• Calculating profit per client annually
• Comparing time spent vs revenue
• Tracking difficult/demanding clients

Example: Client A: £10,000 revenue, 50 hours = £200/hour effective rate ✓
Client B: £8,000 revenue, 100 hours = £80/hour effective rate ✗

Client B is below your cost rate. They’re unprofitable.

5. Excessive Non-Billable Time

If you’re only billing 50% of your time instead of target 70%, every non-billable hour increases your cost rate.

Revised calculation: Available hours: 1,672
Actual billable: 836 (50%)
Cost rate: £120,000 ÷ 836 = £143.54/hour (vs £102.56 at 70%)

This dramatically reduces profitability.

Reduce non-billable time by:

• Systematising admin
• Being selective about pitches
• Charging for proposals (or reducing time spent)
• Efficient marketing and business development

Value-Based Pricing vs Hourly Billing

Once you understand your time costs, you might move beyond hourly billing.

Hourly billing problems:

• Penalises efficiency (faster work = less revenue)
• Client uncertainty about final cost
• Focus on time rather than value
• Constant time justification

Value-based pricing: Charge based on value delivered, not hours spent.

Example: Tax planning saves client £50,000 annually. You charge £10,000 for this service.

It might take you:

• 20 hours (£500/hour effective rate) – highly profitable
• 40 hours (£250/hour effective rate) – still good

Client is happy (saving £40,000), you’re profitable regardless of hours.

This only works if you:

• Understand your costs and minimum profitable rate
• Can articulate value clearly
• Deliver consistently
• Choose the right clients and projects

Project Profitability Reports

Generate regular reports showing:

By project:

• Revenue
• Hours spent
• Cost of hours
• Direct expenses
• Profit/loss
• Profit margin %

By client (annual):

• Total revenue
• Total hours
• Average hourly rate achieved
• Total profit
• Profit margin %

By service type:

• Which services are most profitable?
• Which should you focus on?
• Which should you phase out or reprice?

Example annual client analysis:

Insights:

• Client A: Highly profitable, nurture this relationship
• Client B: Marginally profitable, consider raising rates
• Client C: Excellent, find more like this
• Client D: Unprofitable, immediate action needed

Taking Action on Insights

For unprofitable clients:

Option 1: Raise rates Explain value, justify increase, implement at renewal.

Option 2: Reduce scope Streamline service, remove unprofitable elements.

Option 3: Improve efficiency Systematise processes to reduce time spent.

Option 4: Fire the client Sometimes the best decision. Free capacity for profitable work.

For underestimated projects:

Learn and adjust:

• Why did it take longer than expected?
• What was missed in the estimate?
• How can future estimates account for this?

Build contingency: If technical projects consistently overrun by 20%, build 20% buffer into estimates.

Time Tracking for Teams

If you have staff, time tracking becomes essential for:

• Client billing
• Utilisation monitoring
• Profitability analysis
• Capacity planning
• Performance assessment

Staff time tracking should show:

• Billable vs non-billable breakdown
• Utilisation rate (% of time billable)
• Projects worked on
• Productivity trends

Target utilisation rates:

• Junior staff: 75-85% (less non-billable work)
• Senior staff: 60-70% (more business development, management)
• Partners: 40-60% (significant management and BD time)

Monitor for:

• Staff consistently below target utilisation
• Projects consuming excessive time
• Individuals struggling with certain types of work
• Training needs

Improving Utilisation and Profitability

Strategies that work:

1. Increase Charge Rates

If you’re at 70% utilisation and market rates have increased, raise your rates. Even 10% improves profit significantly.

2. Improve Efficiency

Systemise everything repetitive. Templates, checklists, automation – all reduce time per project.

3. Focus on Profitable Work

Say no to low-margin projects. Direct capacity to high-margin work.

4. Reduce Non-Billable Time

Track where it goes. Cut unnecessary meetings, streamline admin, be selective about proposals.

5. Specialise

Becoming expert in a niche allows:

• Higher rates
• Greater efficiency (doing similar work repeatedly)
• Easier to estimate accurately
• Stronger market position

6. Reduce Scope Creep

Clear agreements, change control processes, boundaries with clients.

Your Time Tracking Implementation Plan

Week 1: Set up systems

• Choose time tracking method/software
• Calculate your cost rate
• Set target utilisation and margin

Week 2-4: Start tracking

• Track all time daily
• Categorise billable vs non-billable
• Note projects and tasks

Month 2: First analysis

• Generate reports by project and client
• Identify profitable and unprofitable work
• Review where non-billable time goes

Month 3: Take action

• Address unprofitable clients
• Improve estimates based on data
• Set improvement targets

Ongoing: Monthly reviews

• Track progress against targets
• Refine processes
• Make data-driven decisions

Common Objections to Time Tracking

“I don’t have time to track time”

It takes 5 minutes daily. Not tracking costs you hours of unprofitable work.

“I charge fixed prices, so time doesn’t matter”

Time tracking tells you if your fixed prices are profitable. Essential information for future pricing.

“I know which clients are profitable without tracking”

Data frequently surprises people. That “easy” client might consume more time than you realize. Verify assumptions with facts.

“It feels like micromanagement”

This is business intelligence, not micromanagement. You can’t improve what you don’t measure.

The Bottom Line

In professional services, time is your primary asset. Understanding where it goes and whether it’s profitable is fundamental to business success.

Time tracking enables:

• Accurate project profitability analysis
• Better pricing and estimation
• Informed decisions about clients and services
• Improved efficiency and margins
• Sustainable, profitable growth

Start simple. Track time daily. Review monthly. Act on insights.

The investment in time tracking pays for itself many times over through better profitability and decision-making.

Need help setting up time tracking or analysing your project profitability? Let’s discuss how to implement this in your practice.