The Napkin Math That Made Me Leave: Where $140 an Hour Goes When You Take Home $22
In 2017 I sat in my truck on a lunch break and did arithmetic on a napkin. The company billed my labor out at $132 an hour. After taxes, after benefits, after everything my employer withheld and kept, my effective take-home was $19.40 an hour. I left in January 2018. That napkin is the reason I have run a one-person plumbing company out of Columbus ever since.
You have done a version of this math at least once. Maybe on your phone during a lunch break. Maybe on a receipt in the truck. You looked at the billing rate on a customer invoice, you looked at your paycheck stub, and you did the subtraction. The calculation takes thirty seconds. The result stays with you for the rest of the afternoon.
Here is the thing most plumbers get wrong about that number: they treat it as an injustice. It is not an injustice. It is a business model. And once you understand the model, you can build something that runs it differently.
Where the Other $217,000 Goes
Start with $140 per hour. Your employer bills that rate for your time. You work 40 hours a week, 50 weeks a year. That is 2,000 hours of your labor generating $280,000 in annual revenue for the company.
Your paycheck lands somewhere between $52,000 and $72,000 depending on your market. The Bureau of Labor Statistics puts the May 2024 median annual wage for plumbers and pipefitters at $62,970. Call it $63,000.
So where does the other $217,000 go?
Part of it is real and legitimate cost. Your employer pays the matching half of your Social Security and Medicare taxes: 7.65% of your gross wage, about $4,820 a year on a $63,000 salary, sent to the IRS on your behalf without anyone calling attention to it. They cover workers’ compensation. They contribute to your health plan. There may be a retirement match. Add it up and the total cost of keeping you employed runs roughly 1.25 to 1.40 times your base wage. At $63,000 in wages, the company’s actual cost to employ you is between $78,750 and $88,200 per year.
That accounts for $78,000 to $88,000 out of $280,000. The remaining $192,000 to $202,000 covers everything else. Here is what everything else looks like:
- Dispatch and office staff. Someone answers the phones, routes the calls, and tracks the jobs. A dispatcher in a mid-size metro earns $38,000 to $52,000 a year. An office manager handling billing, permits, and vendor accounts earns more. A shop running six technicians needs at least two people in the office full-time.
- The vehicle fleet. Payments, fuel, commercial auto insurance, registration, and maintenance on a single work truck run $1,400 to $1,900 per month. Multiply across six trucks.
- Marketing. Google Ads in a competitive residential market run $3,000 to $8,000 per month for a mid-size shop. Vehicle wraps cost $2,500 to $4,000 per truck. Then the door hangers, the yard signs, the Yelp listing.
- Software. Enterprise dispatch platforms run $1,500 to $3,000 per month for a multi-technician operation.
- Insurance. General liability at commercial limits, commercial auto on a full fleet, workers’ comp on a multi-employee payroll, and an umbrella policy on top. The stack for a six-tech shop runs $4,000 to $7,000 per month.
And then the owner’s salary and annual distributions. And, in a growing number of markets since 2019, a private equity firm’s margin on top of all of that.
PE firms have been buying independent plumbing shops at an accelerating rate since 2019, and the trade press documents the consolidation continuing through 2024 and 2025. The transaction follows the same script every time: acquire the shop, cut costs, standardize operations, raise billing rates to customers, and sell the consolidated portfolio at a multiple of earnings. What does not increase during that process is what the technicians earn. The billing rate gap widens.
I watched this from the inside. I worked for the same shop in Columbus for fifteen years. A private equity group bought it in 2016. The napkin came out in 2017. This is not malice. It is arithmetic operating in the wrong direction for everyone driving a truck.
What a Shop Costs to Run, and What You Would Cost
Put a hard number on the overhead sitting between the billing rate and your paycheck.
A plumbing shop running five technicians and a dispatcher in a mid-size metro carries overhead of $35,000 to $50,000 per month. That covers the office staff, the fleet, the insurance stack, the marketing budget, the dispatch software, and the owner’s draw. It does not include the technicians’ wages. The billing rate has to carry all of it and still leave the owner a profit. The math works, for the shop.
Now look at what one licensed plumber working from one truck actually needs:
- One truck: payment, commercial auto insurance, fuel, and maintenance, $1,200 to $1,900 per month
- General liability insurance at one-person limits: $150 to $300 per month
- Field service software (Housecall Pro or Jobber): $49 to $79 per month
- Accounting software: $0 to $30 per month
- A business phone line: $15 per month
- Consumables and fittings in the truck: $100 to $200 per month
Total overhead for a solo plumbing operator in year one: roughly $1,580 to $2,610 per month. A working figure of $2,000 per month is realistic for most markets.
The shop runs $35,000 to $50,000 a month in overhead. You run $2,000. That is the entire argument for going solo, in two sentences. You are not paying for a dispatcher. You are not paying for a fleet manager. You are not subsidizing anyone’s acquisition. You are covering the actual cost of one licensed plumber working from one truck.
It is also why you do not need to undercut the big shop on price to compete. You are not carrying their overhead. Their $140 rate exists because their cost structure demands it. Your rate gets to exist because your math says so.
The Solo Math at $95 an Hour
Here is what the same skill set produces when the spread works in your favor instead of theirs. The assumptions: 30 billable hours per week, 48 working weeks a year, materials revenue at 20% of labor, overhead at $2,000 a month, self-employment tax at 15.3% on net income, and a blended income tax rate around 18%.
At $95 per hour:
- Annual labor revenue: $95 x 1,440 hours = $136,800
- Materials revenue (20% of labor): $27,360
- Gross revenue: $164,160
- Less overhead: $24,000
- Net self-employment income: $140,160
- Self-employment tax ($140,160 x 0.9235 x 0.153): $19,799
- Income after SE tax: $120,361
- Income tax at 18%: $21,665
- Net take-home: approximately $98,696
If you currently take home $63,000 as an employed plumber, the $95 scenario puts you roughly $36,000 ahead. Run the same structure at $75 per hour and the take-home lands around $74,000. At $115 per hour, it clears $123,000. Your market rate may differ. Your overhead may be higher or lower depending on your truck situation and your geography. The structure of the calculation does not change.
Notice the number in the assumptions that surprises people: 30 billable hours per week. Not 40. Thirty.
Forty hours of work does not equal 40 billable hours, and it never did. Drive time between jobs eats 60 to 90 minutes on a typical residential service day. Estimate callbacks that do not convert eat 45 minutes each and invoice nothing. Parts runs are real time attached to no invoice. Administrative work takes one to two hours a day. January and February in most residential markets run 15 to 20 billable hours a week no matter what you do. Averaged across a full year, a realistic solo plumber bills 25 to 32 hours per week.
The employed plumber at $63,000 works a full 40-hour week to produce that paycheck. The solo plumber in the scenario above takes home $98,700 on 30 billable hours. The remaining time goes to parts runs, estimates, paperwork, and whatever you decide to do with a Tuesday afternoon when the schedule clears early. Seven years in, setting my own Tuesday afternoons still surprises me a little.
The Question Underneath the Arithmetic
If the math is this clear, why do most skilled plumbers stay?
It is not the numbers. The thought that stops most plumbers from acting on this arithmetic is quieter than any dollar figure. It sounds like: I am not sure I am the kind of person who runs a business.
That phrase carries more weight than it deserves. It implies that business ownership belongs to a specific category of person. Someone who went to college for it. Someone who was always wired that way. If you do not recognize yourself in that description, the implicit conclusion is that going solo is for someone else.
Pull that framing apart before you spend another year working at someone else’s billing rate.
Running a one-person plumbing company is not entrepreneurship in the TED Talk sense. There is no pitch deck. There is no investor meeting. There is no vision board. It is logistics, pricing, paperwork, and showing up on schedule. The skills required to run it are skills you already use every day on the job: diagnosing problems under pressure with limited information, communicating with stressed customers who need a straight answer fast, estimating time and materials close enough to reality that a job does not turn into a loss, and arriving when you said you would.
You have been doing all of that for ten or fifteen years. You have been doing it on someone else’s billing rate.
The parts that feel foreign are entity formation, insurance, quarterly taxes, and invoicing. Unfamiliar is not the same as complex. Slab leak diagnosis under a poured concrete floor with minimal surface evidence is a complex problem. Opening an LLC through your state’s Secretary of State website takes fifteen minutes. The administrative setup of a solo operation is a sequence of specific tasks. Most of them happen once. Most of them take less time than a service call.
What does not work is waiting for the identity shift to happen before you start. The shift does not happen in advance. It happens during. The first time you collect a deposit on a job with your company name on the paperwork. The first time an invoice payment lands in a bank account that belongs to you. The first time you make a quarterly tax payment on a due date you tracked yourself. Those moments answer the identity question. Nothing you read beforehand will.
I did not feel ready. I left with $9,200 in savings, a 2014 Ram 1500 that was not properly set up for service work, and no idea what I was doing on the business side. The not-ready feeling did not go away on day one. It went away around month four, when I had done enough of the actual work to replace not knowing with having done it.
The identity is not a prerequisite. It is the outcome.
What to Do This Week
Three things, none of which require quitting anything:
- Write down the billing rate your employer charges for your time. Write down what you actually take home per hour after taxes. Keep that subtraction somewhere visible.
- Run the take-home math above with your own numbers: your target rate, your honest estimate of annual billable hours, and $2,000 a month as a starting overhead figure.
- Do not price anything or file anything yet. The rate calculation comes first, and it is more specific than most plumbers think. Get the sequence right and the rest follows.
The business side of a plumbing operation is not a mysterious talent some people have and others do not. It is arithmetic and paperwork. The arithmetic is not harder than a fixture unit count. The paperwork is not more complex than a permit application. If you can read a schematic, you can read a P&L.
The math was always in your favor. The rest is learning how to use it.
I went through this transition in 2018 and spent seven years figuring out everything I got wrong, including a $13,800 tax surprise and a bathroom rough-in I underpriced by $1,600. I wrote all of it down, with the formulas, the form numbers, and the month-by-month numbers, in my book “Stop Billing $140 and Taking Home $22.” If the napkin math in this post looks like your napkin, the book is the sequence of steps that comes next. You can find it on Amazon.