How to tell whether a job actually made money

Ask most contractors which of last month's jobs made the most money and you will get an answer in about two seconds. Ask how they know and the answer gets slower.

It is usually the job that felt good. Nothing went wrong, the customer was pleasant, the check cleared. That job goes in the memory as a winner. Meanwhile the job that ran long and ended in an argument goes in as a loser, and both get filed without anyone ever checking.

Feelings are a terrible scorecard. The job that felt good might have been the one you underpriced by nine hundred dollars and finished fast because you cut something you should have charged for. The one that felt awful might have been the most profitable work you did all year, with one bad hour at the end that colored the whole memory.

You cannot fix what you cannot see. Here is how to see it.

The only comparison that matters

There is exactly one question: what did you think this job would take, and what did it actually take?

Estimate versus actual. That is the whole scorecard. Not revenue — revenue tells you how busy you were, not whether being busy was worth it. Not the bank balance, which is a blur of six jobs, a material order and a truck payment. One job, estimated against actual.

You already produce the first half every time you quote. The estimate exists. What almost nobody does is write down the second half, and so the comparison never happens.

Three numbers, and only three

You do not need job-costing software to start. You need three numbers per job, and you can keep them on a clipboard.

Hours. Every hour anyone spent on that job, including yours, including the drive, including the trip back for the part you forgot. Not billable hours — spent hours. The forgotten ones are where the money goes.

Materials. What you actually paid, from the actual receipts. Not what you estimated. If you bought extra and it went on the shelf, note that separately so it does not get blamed on this job.

What you charged. The final invoice, including any change orders that were actually approved and paid.

Three numbers. Say a bathroom remodel was quoted at $8,400. You estimated sixty hours and $2,800 of material. When it closed, the sheet says seventy-four hours and $3,350 of material.

Now do the arithmetic you have been avoiding. Fourteen hours over and $550 of material over. If your real cost per hour is $74 — and if you do not know that number, that is a different and more urgent problem — those fourteen hours cost you $1,036. Add the material and the job came in about $1,586 light against what you planned.

It still made money. It made about sixteen hundred dollars less than you thought it did, and you would have sworn it went fine.

Track it while it is happening

Here is the part that decides whether any of this works: write it down during the job, not after.

Nobody can reconstruct a week accurately on Friday afternoon. You will forget the hour you spent on the phone with the supplier. You will forget the Saturday morning you went back to fix the trim. Those hours are real, they came out of your life, and a reconstruction quietly drops them — which is exactly why reconstructed numbers always look better than the truth.

Thirty seconds at the end of each day. Hours on, material bought, anything that went sideways. It does not have to be elegant. It has to be the same day.

If you are going to track one thing, track hours. Material has a receipt and can be rebuilt later. Hours leave no trace at all once the day is over.

What the numbers will tell you

Do this for a dozen jobs and patterns show up that no amount of experience would have told you.

One kind of work is carrying you. Almost every trades business has one kind of job that quietly makes more money than the rest — and almost nobody knows which one until they measure. You will probably find your most profitable work is not your favorite work, and that is useful information.

One customer is expensive. Not rude. Expensive. The one who calls six times, changes their mind twice, and wants to meet on site to discuss it. That is real time, and it only shows up when you count hours against a specific job.

Your estimates are wrong in a direction. This is the big one. Most people who start tracking find they are not randomly off — they are consistently off, usually low, usually on the same kind of task. A consistent error is a gift, because you can simply add it to the next quote.

Something you do for free is not free. The extra outlet. The haul-off you did not charge for. The ten minutes that turned into ninety. These look like goodwill until they show up as fourteen hours on a sheet.

The job that lost money is the cheapest lesson you will buy

At some point you will run this on a job and find it lost money. The instinct is to feel sick, and then to never do it again.

Do the opposite. That job already cost you — the money is gone whether or not you look at it. The only thing left to recover is what it can teach you, and you only get that by looking. A job that lost four hundred dollars and told you why is cheaper than ten jobs that lost four hundred dollars each in silence.

The contractors who struggle are not the ones who occasionally underprice a job. Everyone does that. They are the ones who underprice the same job over and over for five years because nobody ever wrote down what it actually took.

What to do on Monday

You do not need to go back and reconstruct the year. That work is unrecoverable and the numbers would be fiction anyway.

Start with the next job. Write the estimate down — hours and material, separately, before you begin. Then track the three numbers as you go. When it closes, spend five minutes comparing.

Do that for ten jobs and you will know more about your own business than most people in the trades learn in a decade. Not because it is clever. Because almost nobody does it, and the people who do stop guessing.