How to Calculate the Cost of an Unfilled Trade Position

An unfilled trade position does not cost a business nothing simply because there is no employee on the payroll.

The cost often moves somewhere else.

Existing tradies work overtime. Supervisors spend more time on the tools. Subcontractors are brought in. Jobs take longer to complete. Customers wait. New work may be turned away because the business does not have enough people to deliver it.

For some businesses, a vacant electrician, plumber, mechanic, fitter, carpenter or other trade position can cost considerably more than the additional recruitment spend required to fill it.

The difficulty is that vacancy costs rarely appear as one neat line in the accounts.

They are spread across payroll, lost capacity, overtime, contractors, delays and management time.

Calculating the cost does not need to be perfect to be useful. Even a reasonable estimate can help employers decide how urgently a position needs to be filled, whether the employment offer needs to improve and how much recruitment spending is commercially justified.

Start With the Vacancy Period

The first number you need is the number of working days the position has been vacant.

Do not automatically measure from the day the job advertisement went live.

If an employee resigned and finished three weeks before recruitment started, the vacancy was already affecting the business during those three weeks.

For a new position, measure from the point at which the business genuinely needed the additional capacity.

Suppose a maintenance fitter position has effectively been vacant for eight weeks.

That gives you a defined period against which you can estimate the financial impact.

You can then convert the cost into a weekly or daily figure.

This becomes particularly useful when deciding whether additional recruitment spending makes sense.

If the vacancy is costing the business thousands of dollars each week, debating whether to spend another few hundred dollars reaching more candidates may be focusing on the wrong number.

Calculate the Lost Productive Capacity

Start by estimating the productive capacity the missing employee would normally provide.

This is not necessarily the same as their wage.

An employee earning $45 per hour may enable the business to generate significantly more value than $45 for each hour they work.

For businesses that directly charge customers for labour, the calculation can be relatively straightforward.

Imagine an electrical contractor normally charges customers $120 per hour for an electrician's labour.

If the missing electrician would realistically produce 32 billable hours during a 38-hour week, the position represents potential labour revenue of:

$120 × 32 = $3,840 per week.

That does not mean the vacancy is automatically costing $3,840 in profit.

Some of that work may be absorbed by other employees, delayed rather than lost or completed by subcontractors.

The number gives you a starting point for understanding the productive capacity associated with the position.

For internal maintenance roles, the calculation is less direct.

A maintenance fitter may not generate billable revenue, but their work can affect machine availability, production output, breakdown response and the workload of other employees.

In those situations, estimate the operational value rather than trying to force the position into a billable-hours model.

Work Out How Much Revenue Is Actually Being Lost

Lost capacity and lost revenue are not always the same thing.

Suppose your business is short one plumber but the remaining team is still completing every booked job.

There may currently be little direct lost revenue.

The cost could instead be appearing through overtime and workload.

On the other hand, if you are declining three service jobs each week because nobody is available, some revenue is genuinely being lost.

Estimate the work you cannot perform specifically because the position remains empty.

For a contractor, this could include jobs turned down, projects delayed or additional work that cannot be scheduled.

For a workshop, it might be vehicles or equipment waiting longer because there are not enough mechanics.

Use realistic contribution rather than simply counting every dollar of customer revenue as lost profit.

If a $10,000 job includes $5,000 of materials and other costs that would not be incurred if the job is declined, the economic loss is not necessarily the full $10,000.

The calculation should help decision-making rather than produce the largest possible number.

Add Overtime Paid to Existing Tradies

One of the easiest vacancy costs to identify is overtime.

When one employee leaves, their workload often does not disappear.

The remaining team absorbs it.

Review the additional overtime being worked because of the vacancy.

If four employees are each working five additional hours every week, that is 20 extra hours.

Calculate what those hours actually cost the business at the applicable overtime rates.

Then compare this with what the ordinary labour cost would have been if the vacant position were filled.

Overtime can keep operations moving in the short term.

It can also become expensive when used as a permanent staffing strategy.

There is a second cost that is harder to put into a spreadsheet.

People get tired.

A crew carrying a vacancy for months may experience more pressure, reduced flexibility and frustration.

That can eventually contribute to another employee leaving, turning one vacancy into two.

Add Subcontractor and Labour-Hire Costs

Businesses often cover trade vacancies with subcontractors, labour hire or other temporary workers.

That can be a sensible response.

It also has a cost.

Calculate what the temporary solution costs above what the permanent employee would normally cost.

For example, suppose temporary trade labour costs the business $75 per hour while the equivalent direct employee would have a lower hourly employment cost after wages and normal on-costs are considered.

The difference represents part of the vacancy cost.

Be careful not to treat the entire subcontractor invoice as a loss.

The business would have incurred costs if the permanent employee were working too.

You are interested in the additional cost created by the vacancy.

Temporary labour can still be financially worthwhile.

If spending an extra $1,000 per week allows the company to deliver $10,000 of profitable work that would otherwise be lost, it may be an excellent short-term decision.

The calculation gives you the information to make that choice properly.

Measure the Cost of Project Delays

Vacancies can create costs that are not directly connected to hours worked.

A construction contractor may complete projects more slowly.

A manufacturer could experience longer maintenance response times.

A service business might develop a backlog.

Consider what those delays mean financially.

Could the business face contractual costs?

Are invoices being issued later because projects are taking longer?

Is another trade unable to begin because your work has not been completed?

Are customers cancelling because the wait is too long?

Does the business need to hire temporary labour at short notice to meet a deadline?

Not every delay has a measurable dollar value.

Where it does, include it.

Where it does not, record the operational effect separately so it is not ignored simply because the accounting is difficult.

Calculate Lost New Business

One of the largest vacancy costs can be invisible because the work never enters the business.

A customer calls.

You are fully booked.

You cannot take the job for another six weeks.

They call someone else.

Nothing appears in your accounting software because the customer never became a sale.

Growing trade businesses should pay particular attention to this.

If demand is strong but labour capacity is preventing growth, an unfilled position may be limiting revenue every week it remains open.

Look at enquiries you are declining, quoting activity you are reducing or projects you cannot tender for because the workforce is already stretched.

Estimate conservatively.

Do not assume you would have won every possible project.

Even a rough estimate can show whether the missing employee is preventing the business from taking advantage of genuine demand.

Include Management and Supervisor Time

Recruitment itself consumes time.

Someone writes the advertisement.

Applications are reviewed.

Candidates are called.

Interviews are conducted.

References are checked.

Managers discuss the vacancy repeatedly.

When recruitment drags on for months, this process can consume considerably more management time than expected.

Estimate the hours spent by owners, managers, supervisors and administration staff dealing with the vacancy.

Then assign a reasonable hourly employment cost or value to that time.

You can include recruitment administration, but also think about operational management.

If a supervisor spends ten additional hours on the tools every week because the crew is short, those are ten hours they are not spending supervising, planning work or solving other problems.

The direct labour may still be productive.

The opportunity cost is what the supervisor is no longer able to do.

Consider the Effect on Productivity

A team of five does not always produce exactly 80% of what a team of six produces when one person leaves.

The disruption can affect the entire crew.

Jobs may need to be rescheduled.

Employees wait for assistance.

Supervisors change priorities constantly.

Experienced workers spend more time covering tasks outside their normal responsibilities.

In maintenance environments, preventative work may be postponed because the reduced team is focused on urgent breakdowns.

These productivity effects can be difficult to calculate precisely.

Do not invent a percentage simply to make the spreadsheet look complete.

Use operational information you actually have.

Compare output before and after the vacancy where possible.

Look at billable hours, completed jobs, maintenance backlog, production downtime, workshop throughput or another measure relevant to your business.

If performance changed materially when the vacancy appeared, some of that difference may reasonably be attributed to the missing capacity.

Don't Forget the Risk of Losing Another Tradie

This is one of the hardest costs to quantify, but it should not be ignored.

Imagine an electrician resigns.

The remaining electricians work additional overtime for three months while the business searches for a replacement.

Eventually another employee becomes tired of the workload and leaves.

The business now has two vacancies.

This is why relying indefinitely on existing employees to cover a vacant position can become expensive even when overtime appears manageable.

Watch for increasing absenteeism, excessive overtime, complaints, annual leave difficulties and signs that the team is becoming overloaded.

You do not need to assign an imaginary dollar figure to the risk.

Include it in the decision.

A vacancy that is placing the rest of the workforce under sustained pressure may deserve greater recruitment urgency than the direct financial calculation alone suggests.

Build a Simple Vacancy Cost Calculation

You can combine the measurable components into a simple weekly estimate.

For example, imagine a trade business has an unfilled electrician position.

Each week, the business estimates:

• $2,000 in contribution from work it cannot accept
• $900 in additional overtime
• $600 in additional subcontractor costs
• $300 in management and scheduling time
• $400 in estimated costs associated with delays

The estimated weekly vacancy cost is:

$2,000 + $900 + $600 + $300 + $400 = $4,200.

If the role remains vacant for eight weeks:

$4,200 × 8 = $33,600.

Again, this is an estimate.

The purpose is not to claim the vacancy has cost exactly $33,600 down to the dollar.

It is to establish the scale of the problem.

If the business is losing approximately $4,200 each week, spending additional money on recruitment, increasing the advertised rate or improving the employment package can be evaluated against that number.

Compare Vacancy Cost With the Cost of Improving the Offer

This is where the calculation becomes useful.

Suppose you have been advertising for a fitter at $45 per hour and receiving very little interest.

You believe increasing the rate to $48 could make the vacancy substantially more competitive.

The immediate reaction might be that an extra $3 per hour is expensive.

Across a 38-hour week, that is an additional $114 in base wages before considering related employment costs.

Now compare that with a vacancy costing the business several thousand dollars every week.

Suddenly the decision looks different.

That does not mean every vacancy should be solved by increasing pay.

The problem could be roster, location, job advertising, unrealistic requirements or a slow recruitment process.

The point is to compare recruitment decisions with the cost of doing nothing.

A business can become so focused on minimising the cost of the hire that it ignores the much larger cost of leaving the position empty.

Compare Vacancy Cost With Recruitment Spending

The same principle applies to job advertising and recruitment services.

Suppose an employer is reluctant to spend another $200 promoting a vacancy.

That may be sensible if the role is not urgent and the existing advertising is working.

It makes less sense if the vacancy is costing thousands of dollars each week and the current campaign is producing no suitable candidates.

Recruitment agencies can involve a much larger cost, so the calculation becomes more important.

Rather than asking whether the recruitment fee sounds expensive in isolation, compare it with the expected cost of the position remaining vacant.

If the role could realistically remain empty for another three months without additional recruitment help, what would those three months cost?

The answer may still be that the additional recruitment service is not worthwhile.

At least the decision is being made against the correct comparison.

Calculate Cost of Vacancy Over Time

Vacancy cost is rarely static.

During the first week, the team may absorb the workload relatively easily.

After a month, overtime increases.

After two months, project schedules start slipping.

After three months, employees are tired and customers are waiting longer.

This means the weekly cost can increase the longer a position remains open.

Consider reviewing the calculation at set intervals.

For example:

• Week 1
• Week 4
• Week 8
• Week 12

Update overtime, temporary labour, lost work and operational effects.

This can help identify the point at which a vacancy has moved from inconvenient to commercially serious.

It also prevents employers from continuing the same unsuccessful recruitment strategy indefinitely.

Where Tradie Jobs Fits In

Tradie Jobs gives Australian employers a dedicated place to advertise trade and blue-collar vacancies.

When deciding how much effort to put into a recruitment campaign, consider what the unfilled position is already costing the business.

A vacancy affecting revenue, overtime, project capacity or the workload of existing employees may justify a more proactive approach.

Start with the employment offer.

Make sure the pay, conditions and requirements are realistic.

Then write a clear advertisement explaining the work, location, roster and genuine benefits.

Hiring tradies? Post your job on Tradie Jobs and compare the cost of advertising the vacancy with the cost of leaving an important position empty.

Recruitment has a cost.

So does not recruiting.

Final Thoughts

The true cost of an unfilled trade position is much bigger than the wage you are temporarily not paying.

Start with the vacancy period and estimate the productive capacity that is missing.

Then look at what is actually happening inside the business.

Add lost profitable work, overtime, additional subcontractor or labour-hire costs, project delays and management time where they can reasonably be measured.

Consider operational effects that are harder to quantify as well, including backlogs, customer service and pressure on the existing workforce.

You do not need a perfect number.

A conservative estimate is often enough to change the way a vacancy is viewed.

Once you know the position may be costing $2,000, $4,000 or more each week, recruitment decisions have context.

An improved pay offer is no longer just an additional payroll expense.

Paid job advertising is no longer simply a marketing cost.

Temporary labour is no longer automatically expensive.

Each option can be compared with the cost of allowing the vacancy to continue.

That is the real purpose of calculating vacancy cost.

It turns an unfilled position from a vague staffing problem into a commercial problem the business can make decisions about.

Frequently Asked Questions

What is the cost of an unfilled position?

It is the financial and operational impact created while a required position remains vacant. It can include lost work, overtime, temporary labour, delays, reduced productivity and management time.

How do you calculate the cost of an unfilled trade job?

Estimate the measurable weekly costs caused by the vacancy, add them together and multiply by the relevant vacancy period. Include only costs or lost contribution reasonably connected to the missing position.

Should I include the employee's salary as a vacancy cost?

Not automatically. The salary is generally a cost the business is temporarily avoiding. Focus instead on the additional costs and lost value created because the employee is missing.

Is lost revenue the same as lost profit?

No. Revenue that would have required materials, labour or other costs should not automatically be treated as entirely lost profit.

Should overtime be included?

Yes, where additional overtime is being worked because of the vacancy. Consider the additional cost compared with normal staffing.

Should subcontractor costs be included?

Include the additional cost of using subcontractors or temporary labour compared with the cost the business would normally incur with the position filled.

How do I calculate vacancy cost for an internal maintenance trade?

Look at operational impacts such as downtime, maintenance backlog, production delays, overtime, contractors and reduced preventative maintenance rather than relying on billable revenue.

Can a vacancy affect employee retention?

Yes. Sustained additional workload and overtime can place pressure on existing employees and may increase the risk of further turnover.

Should recruitment advertising be included in the calculation?

Recruitment spend can be tracked separately as part of the total cost of filling the vacancy. It can then be compared with the ongoing cost of leaving the position unfilled.

Is it worth paying more to fill a vacancy faster?

Sometimes. Compare the additional employment cost with the estimated ongoing vacancy cost and consider whether pay is actually the reason recruitment is difficult.

When should I use labour hire to cover a vacancy?

Temporary labour can make sense when it prevents greater losses from missed work, delays or insufficient capacity while permanent recruitment continues.

How accurate does the calculation need to be?

It does not need to be exact. A conservative and transparent estimate can be enough to support better recruitment decisions.

How often should vacancy cost be reviewed?

For difficult vacancies, reviewing it every few weeks can help identify whether overtime, lost work or operational pressure is increasing.

What if I cannot calculate lost productivity?

Use measurable operational indicators such as completed jobs, billable hours, backlog, downtime or output where possible. Avoid inventing a number without evidence.

Can an unfilled position ever have little cost?

Yes. If the workload can genuinely be absorbed without significant overtime, lost capacity or disruption, the short-term vacancy cost may be relatively low.

Why should employers calculate vacancy cost?

It allows recruitment spending, pay increases, temporary labour and other hiring decisions to be compared with the financial impact of doing nothing.