ROI: Did That Money Actually Earn Its Keep?

Revenue is not a return

You spent $6,000 on marketing and booked $30,000 in work. Great. You did not earn a 400% return.

You still had to do the damn work.

Materials, field labor, subcontractors, and card fees all want their cut. Calling sales your return is how owners convince themselves an expensive mistake was brilliant.

ROI means return on investment: how much you gained compared with what you put in.

For a practical cash-based decision, use:

ROI = (additional cash benefit before the investment cost − total investment cost) ÷ total investment cost × 100

The benefit must already account for the extra costs of delivering the work. Subtract the investment once. Not twice.

For the examples below, we’ll use pre-tax cash returns, with no borrowing. An accounting-profit calculation can differ, especially when equipment is depreciated over several years.

Here’s the marketing math that matters

Suppose your plumbing business runs a three-month campaign.

The investment is:

• Ads: $4,500.
• Campaign setup and management: $1,000.
• Extra paid office hours handling leads: $500.
• Total investment: $6,000.

You complete and collect payment on 20 additional jobs averaging $1,500 each. That’s $30,000 in revenue.

The labor, materials, and other delivery costs total $18,000. That leaves $12,000 before paying for the campaign.

ROI = ($12,000 − $6,000) ÷ $6,000 × 100 = 100%.

You recovered the $6,000 investment and generated another $6,000. That’s a useful return, not a vanity number.

Each job contributed $600 before marketing: $1,500 in revenue minus $900 in delivery costs.

Your break-even point was therefore 10 additional jobs: $6,000 ÷ $600. You got 20.

Now you have a decision tool. Before approving the next campaign, ask whether it can realistically deliver more than 10 comparable jobs—not whether the agency’s presentation has nice gradients.

Count everything. Invent nothing.

The invoice is rarely the whole investment.

Software needs setup. Equipment needs installation. A new service needs training, inventory, and probably several hours of someone swearing at a printer.

Include the cash costs required to make the purchase produce results. Include extra delivery costs when calculating the benefit. Don’t dump unchanged rent into the calculation just because a spreadsheet has an empty row.

Also separate cash savings from freed-up capacity.

Suppose scheduling software saves your salaried office manager five hours a week. If payroll stays the same, you have not reduced payroll expense. You have freed five hours.

That capacity becomes a financial benefit if it helps you avoid overtime, delay a necessary hire, collect overdue invoices, or handle more profitable work. Until then, it is useful time—not cash in the bank.

Owner time matters too. Record implementation hours separately and decide what they displace. A project requiring 80 owner hours is not effortless just because you don’t send yourself an invoice.

Put a clock on the return

“An ROI of 95%” sounds excellent. Over three months? Three years? Since the invention of indoor plumbing?

Every ROI needs a stated measurement period.

Suppose a shop buys equipment for $24,000, including installation and training. It eliminates $1,500 a month in outsourcing costs but adds $200 in monthly maintenance and consumables.

The net monthly cash benefit is $1,300.

• First-year benefit: $1,300 × 12 = $15,600.
• First-year cash ROI: ($15,600 − $24,000) ÷ $24,000 = −35%.
• Three-year benefit: $1,300 × 36 = $46,800.
• Three-year cash ROI: ($46,800 − $24,000) ÷ $24,000 = 95%.

These examples assume steady savings and exclude resale value. The negative first-year figure means the cash investment hasn’t paid back yet. It does not mean the equipment is worthless.

Payback period tells you how long it takes to recover the investment. Here, $24,000 ÷ $1,300 is about 18.5 months, assuming benefits start immediately.

ROI measures the gain. Payback measures the wait. Your bank balance cares deeply about the wait.

Compare against what happens if you do nothing

The important word is additional.

If a promotion generates $20,000 in sales but $15,000 would have happened anyway, you cannot credit the promotion with all $20,000. You may also have discounted work customers would have bought at full price.

Ask what would likely happen without the investment. That is your baseline.

Then build three versions: conservative, expected, and optimistic. Change jobs won, margins, implementation delays, and ongoing costs. Don’t just shave 10% off the revenue and declare the risk assessed.

In our marketing example, eight jobs produce $4,800 before campaign costs. Against a $6,000 investment, that’s a $1,200 loss and −20% ROI.

Can you afford that outcome?

There is no universal “good ROI.” Set your own approval rules around risk, cash reserves, and alternatives. An illustrative rule might require a positive 12-month return for discretionary marketing and equipment payback within 24 months. Those are policy choices, not industry benchmarks.

And don’t rank everything by percentage alone. A 200% return on $500 earns $1,000. A 50% return on $20,000 earns $10,000. Both the percentage and the dollars matter.

Monday morning: fix the biggest guess first

Pick one meaningful expense you currently defend with “I think it’s working.”

• Write down its full cost and measurement period.
• Estimate the additional cash benefit after delivery costs.
• Calculate ROI, break-even volume, and payback where useful.
• Check when cash leaves and when customer payments arrive.
• Assign someone to track actual results and set a review date.

Fix missing job-cost or sales-tracking data before buying more of the same.

You don’t need a perfect forecast. You need assumptions you can test—and the willingness to stop funding bullshit when the numbers say stop.