How to calculate a job's profit margin: a complete guide

Illustration: chart of a job's margin between costs and revenue

What is a job's profit margin

A job's profit margin is the difference between the revenue generated by a project and the costs incurred to deliver it. It is one of the most important indicators for companies that work by the job, because it shows which activities generate profit and which reduce the company's profitability.

Many businesses know the revenue a job brings in, but have no precise view of its actual costs. This makes it hard to make the right decisions and improve financial performance.

Why it matters to monitor margins

Controlling margins lets you:

  • identify the most profitable jobs
  • spot activities that absorb too many resources
  • make quotes more accurate
  • plan work better
  • increase company profitability

Companies that monitor margins regularly make better-informed decisions and reduce hidden losses.

How to calculate the margin

The basic formula is very simple:

Margin = Job revenue - Job costs

To get a reliable figure, however, you need to know all the costs incurred precisely.

The main costs include:

  • hours worked by staff
  • costs of external contractors
  • materials used
  • travel
  • overheads attributable to the job

The role of hours worked

In most service companies the main cost is people's time.

If hours worked are not recorded properly, it becomes impossible to know the real cost of a job.

That is why time tracking is the foundation of management control.

Budgeted and actual hours

One of the most common mistakes is comparing only revenue with the initial estimated cost.

For a correct assessment you need to compare:

  • budgeted hours
  • hours actually worked
  • estimated costs
  • actual costs

When actual hours exceed budgeted hours, the job's margin tends to shrink.

A worked example

Suppose a job worth €10,000.

Quote:

  • 100 hours of work
  • average hourly cost €40

Expected cost: €4,000

Expected margin: €6,000

If the project actually takes 160 hours instead of 100:

Actual cost: €6,400

Actual margin: €3,600

The job is still profitable, but the margin has fallen by 40%.

How to improve job control

To improve margins it's important to:

  • record hours every day
  • link activities to the right jobs
  • monitor variances
  • analyse the causes of inefficiencies
  • update quotes regularly

How Tymex can help

Tymex is timesheet software designed to track hours worked on jobs.

With the mobile app and the web interface, technicians, consultants and staff can log activities and hours in a few seconds.

The information collected lets the company:

  • control costs and time
  • compare budgeted and actual figures
  • monitor job margins
  • improve management control

Conclusions

A job's margin depends not only on revenue but above all on the ability to control the time and resources used.

Accurate tracking of hours worked is the first step to understanding project profitability and making decisions based on real data.

If you want to improve control over your jobs, Tymex can help you collect precise, up-to-date information to analyse costs, activities and margins.

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