Most owners open their profit and loss statement, look at the number at the bottom, feel either fine or sick about it, and close the tab. That is a waste of the most useful page in your business. A P&L is five lines, and once you can read a profit and loss statement line by line, each one hands you a decision for next month. Here is the whole thing on one real example, top to bottom, in about ten minutes.
How to read a profit and loss statement: the five lines
Strip away the sub-categories your accounting software stacks up and every P&L is the same five lines, in this order. Everything else is detail hanging off one of these.
- 1.Revenue — the money you billed for work.
- 2.Cost of services — what it cost you to deliver that work.
- 3.Gross profit — revenue minus cost of services.
- 4.Overhead — the cost of keeping the doors open, job or no job.
- 5.Net profit — what actually landed after everything.
Cash vs accrual changes what you are reading
A cash-basis P&L counts money the day it moves; an accrual P&L counts it when the work is done or billed. Same five lines, different timing — and it changes which month a job shows up in. If that distinction is fuzzy, read cash basis vs accrual for a service business first, then come back.
Revenue: what it does and does not include
Revenue is the top line: the total you billed customers for work in the period. It is not the money in your bank account, and it is not sales tax you collected — that is the state's money passing through, not yours. It also is not deposits on work you have not done yet, if you are on accrual. Read the top line as one question: did we sell more or less than last month, and do I know why.
What it tells you to do: if revenue dropped and you were not slammed, the problem is upstream in the pipeline — not enough quotes going out, or too many sitting unsigned. If revenue is up but the bottom line is not, the leak is in one of the next three lines.
Cost of services, not COGS: what counts
This is where service owners get tripped up. Retail has cost of goods sold (COGS) — the wholesale cost of the products it resells. You do not resell products; you sell work. Your version is cost of services: the costs that only exist because you did the job. Same slot on the P&L, different contents.
- Job labor — the fully-loaded cost of the crew hours on the work (wage plus payroll taxes, workers-comp, and benefits, not the bare wage).
- Materials — parts, product, and supplies consumed on the job at what you actually paid.
- Direct costs — a subcontractor, equipment fuel, dump fees, a permit: anything you would not have spent if the job had not existed.
The line that decides everything below it
The single most common mistake here is putting the owner's truck payment, the office manager's salary, or your software bill in cost of services. Those are overhead — they exist whether you run one job or fifty. Keep this line to costs that scale with the work, or every number under it lies to you.
What it tells you to do: divide cost of services by revenue. If that ratio is climbing month over month, either your pricing is slipping or your jobs are running long. Both are fixable, but only if you can see the line clearly. If you have never set a floor under your rate, what should you charge per hour walks the break-even math.
Gross profit: the number that pays for everything else
Gross profit is revenue minus cost of services, and as a percentage it is gross margin. This is the most important number on the page, because it is the money left to cover overhead and pay you. If gross margin is thin, no amount of overhead-trimming saves you — you are underpricing the work itself.
Healthy service work usually runs a 40–60% gross margin, though it varies by trade — the real benchmarks by service type are in what’s a good profit margin for your trade. Below about 30% and the job is barely covering the crew and the parts. What it tells you to do: if gross margin is low, the fix lives in the quote, not the office. That is a pricing problem, and the usual culprit is confusing markup with margin — see the margin-vs-markup mistake for the one swap that fixes it.
Overhead: the line owners underestimate
Overhead is every cost of being in business that you cannot trace to a single job: rent, the office phone, insurance, software, advertising, admin salaries, your accountant. On the P&L it is often broken into a dozen small line items, which is exactly why owners underestimate the total — no single row looks scary, but they add up to more than the crew.
What it tells you to do: total overhead and divide it by revenue. If that percentage is creeping up while revenue is flat, you have added cost without adding capacity. Read the individual rows for the ones that grew — a software subscription that renewed at triple, a phone plan you forgot about, three tools doing one job.
Net profit: what actually landed
Net profit is gross profit minus overhead — the bottom line, the number you glanced at and closed the tab on. Read as a percentage of revenue, a lot of healthy service businesses land somewhere around 10–20% net. Negative means the month cost you money to run. But the number itself is not the lesson. The lesson is which of the four lines above put it where it is.
A worked example, line by line
Numbers make this concrete. Here is one month for a small landscaping crew, and the decision each line hands the owner.
Revenue: $60,000
Billed work for the month. Up 12% from last month. Good — but hold the celebration until the bottom line agrees.
Cost of services: $27,000
Crew labor, plants, mulch, dump fees, one subcontracted irrigation job. That is 45% of revenue. Last month it was 40%. The ratio moved the wrong way — worth checking whether a job ran long or got underbid.
Gross profit: $33,000 (55% margin)
Revenue minus cost of services. A 55% gross margin is healthy for this trade. This is the pool that has to cover everything else and pay the owner.
Overhead: $21,000
Truck payments, insurance, office salary, software, fuel for the trucks, advertising. That is 35% of revenue — high. Two subscriptions renewed this month and an ad spend spiked. Both are worth a second look.
Net profit: $12,000 (20% net margin)
A solid month. But the story is not "we made 20%." It is: revenue grew, cost of services crept up 5 points, and overhead ate more than a third. Next month, tighten the two overhead items and confirm the cost-of-services jump was a one-off, and the same revenue clears more.
That is the whole skill. You are not reading a P&L to know the bottom line — you already feel that. You read it to find the one line that moved and decide what to do about it before next month repeats it.
Where the numbers should come from
A P&L is only as honest as its inputs. When your quotes, invoices, and bank imports all feed one set of books, the five lines reconcile without you re-typing anything — that is why Mortar keeps a cash-basis P&L that reads straight from the money you actually moved. Garbage in, garbage on the bottom line.
What is COGS for a service business?
A pure service business does not really have cost of goods sold in the retail sense, because it does not resell products. The equivalent line is cost of services: the labor, materials, and direct costs that exist only because you did the job. Some software still labels it COGS — read it as cost of services and keep overhead out of it.
How do I create a profit and loss statement for my business?
List revenue for the period, subtract cost of services to get gross profit, then subtract overhead to get net profit. Any bookkeeping tool that imports your bank activity can build it; the work is categorizing each transaction correctly — job costs in cost of services, everything-else-to-keep-the-doors-open in overhead.
What do the numbers on a P&L actually mean?
Read them as ratios, not just dollars. Cost of services divided by revenue tells you if pricing or job length is slipping. Gross margin tells you if the work itself is priced right. Overhead over revenue tells you if the office is growing faster than the business. Net margin is the result of all three.
How often should I look at my P&L?
Monthly, once the month closes. Reviewing it monthly means you catch a slipping cost-of-services ratio in weeks instead of finding it at tax time when the year is already spent.
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