How to Read Your P&L Statement (And What Most Small Business Owners Miss)
Every month, your bookkeeper or accounting software generates a profit and loss statement. Most small business owners in Illinois and Wisconsin open it, look at the bottom number, and close it.
That bottom number — net income — is the least useful number on the report. It tells you how the story ended. It doesn’t tell you why, where it went wrong, or what you can do about it before next month.
This guide covers how to read a profit and loss statement the right way — what each section means, what the numbers are telling you, and what most small business owners miss every single month.
What this post covers: A profit and loss statement for small business owners shows revenue, costs, and profit over a period of time. The five sections are: Revenue, Cost of Goods Sold (COGS), Gross Profit, Operating Expenses, and Net Income. Most small business owners look only at net income and miss the three numbers that actually drive it: gross margin, operating expense ratio, and the trend across months. This post walks through each section with a real Illinois contractor example, industry margin benchmarks, and a 15-minute monthly review routine.
What a Profit and Loss Statement Is — And What It Doesn’t Tell Your Small Business
A profit and loss statement answers one question: did your business earn more than it spent over a given period?
It is not the same as your bank balance. Unlike the P&L, your bank account doesn’t show who owes you money, what you owe vendors, or how much working capital you actually have. Those answers live on your balance sheet and cash flow statement — separate reports that every business should run alongside the profit and loss statement.
What the P&L does exceptionally well is show you the engine of your business: how much you earned, what it cost to deliver that, and what was left over after you paid to run the business. Every section feeds the next. If one section is off, everything below it is distorted.
The IRS requires most small businesses to maintain accurate income records — your profit and loss statement is the foundation of that record-keeping, regardless of your entity structure.
How to Read a Profit and Loss Statement: The Five Sections Every Small Business Owner Needs to Know
Every P&L — from a $200K sole proprietor to a $10M S-Corp — follows the same structure. Here’s a simplified example for a $1.8M Illinois contractor, followed by a plain-English explanation of each section.
Sample P&L: Midwest Contracting Co. | January–June 2026
| Line Item | Amount |
|---|---|
| REVENUE | |
| Contract Revenue | $924,000 |
| Service & Change Orders | $48,000 |
| Total Revenue | $972,000 |
| COST OF GOODS SOLD (COGS) | |
| Field Labor | $312,000 |
| Materials & Supplies | $194,000 |
| Subcontractors | $88,000 |
| Total COGS | $594,000 |
| Gross Profit (38.9% margin) | $378,000 |
| OPERATING EXPENSES | |
| Owner Compensation | $72,000 |
| Office Staff & Admin | $38,000 |
| Rent & Utilities | $18,000 |
| Vehicles & Equipment | $41,000 |
| Insurance | $22,000 |
| Marketing & Advertising | $9,000 |
| Professional Fees (Accounting, Legal) | $14,000 |
| Other Operating Expenses | $11,000 |
| Total Operating Expenses | $225,000 |
| Net Income | $153,000 |
Section 1: Revenue
Revenue is the total amount your business earned from selling products or services during the period — before any costs. It’s recorded when earned, not when paid. For a service business, revenue appears when the job is complete and invoiced.
Watch for: multiple revenue streams broken out separately. If your contractor business does both new construction and service work, they should appear as separate lines. Blending them hides which type of work is actually profitable.
Section 2: Cost of Goods Sold (COGS)
COGS is the direct cost of delivering your revenue. For contractors, that’s field labor, materials, and subcontractors. In a restaurant, it’s food and beverage costs. Service businesses with no physical product may see this called Cost of Services (COS) — the labor directly tied to delivering the work.
What doesn’t belong in COGS: rent, office salaries, marketing, insurance, or anything that would exist even if you sold nothing. Those are operating expenses.
Section 3: Gross Profit
Gross profit is revenue minus COGS. Gross margin is that number expressed as a percentage of revenue.
In the example above: $378,000 ÷ $972,000 = 38.9% gross margin.
This is arguably the most important number on the P&L. It tells you whether your core business model is profitable before you even consider overhead. Healthy gross margin ranges vary by industry:
- General contractors: 20–35% is typical; specialty trades can run 35–50%
- Restaurants: 60–70% on food and beverage (then operating expenses hit hard)
- Insurance agencies: 40–60% depending on commission structure
- Medical/dental practices: 35–55% depending on specialty and staffing model
- Professional services: 50–70%
If your gross margin is below industry norms, no amount of cost-cutting on the overhead side will fix it. The problem is in your pricing or your direct costs — and it needs to be addressed there.
Section 4: Operating Expenses
Operating expenses are everything it costs to run the business that isn’t directly tied to delivering your product or service: rent, owner compensation, office staff, marketing, insurance, vehicles, professional fees.
The operating expense ratio — total operating expenses as a percentage of revenue — tells you how efficiently you’re running the business. In our example: $225,000 ÷ $972,000 = 23.1%. For a $1M+ contractor, that’s a reasonable number. If operating expenses are above 35–40% of revenue for most service businesses, overhead is eating your profit.
Owner compensation deserves special attention. It should reflect what you’d pay someone to do your job — not whatever’s left over after bills. Underpaying yourself distorts the P&L and makes the business look more profitable than it actually is.
Section 5: Net Income
Net income is gross profit minus operating expenses. It’s what the business earned after all costs — the “bottom line.”
In our example: $378,000 − $225,000 = $153,000. That’s a 15.7% net margin — solid for a contracting business in this revenue range.
Net income is useful. It’s just not the most useful number. The trend across months and the margins above it tell you far more than any single period’s bottom line.
What Most Small Business Owners Miss on Their Profit and Loss Statement
Understanding the structure is step one. Here’s what separates owners who use their P&L from owners who file it.
Looking at One Month Instead of the Trend
A single month’s P&L is a snapshot. However, three to six months of P&Ls is a story. Gross margin creeping down 1–2 points per quarter is a serious problem — but it’s invisible if you only look at one report at a time. Instead, pull your last six months side by side. Look for direction, not just the current number.
Not Comparing to a Budget or Prior Year
A P&L without a comparison is a report without context. $153,000 net income sounds fine — but is it up or down from last year? Is it ahead of or behind your plan? Specifically, the most powerful version of a P&L review compares actuals to budget (what you planned) and prior year (what you did). Gaps in either direction need an explanation. Without a budget, you’re just observing. With one, however, you’re managing.
Ignoring the Gross Margin Line
Most small business owners skip straight to net income. Gross margin is the more actionable number. If your gross margin is eroding — even while net income looks okay — your pricing or direct costs have a problem that will eventually show up at the bottom, usually at the worst possible time.
For restaurant owners: food cost percentage (COGS ÷ revenue) should be reviewed weekly, not monthly. A restaurant that lets food cost drift from 28% to 34% over six months has a real problem — but it’s invisible if you only look at the monthly net income number.
Treating the P&L as a Tax Document Instead of a Management Tool
This is the most expensive miss. A profit and loss statement is generated monthly — but if the only time you review it seriously is when your accountant needs it for your tax return, you’ve reduced a real-time management tool to an annual compliance document.
Reviewed monthly with your advisor, the P&L leads to conversations about what to do differently next month. Reviewed annually in February, it leads to conversations about what happened eleven months ago — when there’s nothing you can do about it.
Not Asking What the Numbers Are Telling You to Do
The P&L is a diagnostic tool. Every number on it implies an action:
- Gross margin below industry norms → pricing review or COGS audit
- Operating expenses rising faster than revenue → overhead audit
- Revenue flat for three months → pipeline or capacity conversation
- Net income strong but cash tight → receivables or timing review
If you’re reading your P&L and not asking “what should I do about this?”, you’re using it wrong. This is what the monthly advisory call at Accounting Freedom’s Core+ and CorePro tiers is built around — not just generating the report, but telling you what it means.
How to Use Your Profit and Loss Statement Every Month — A Simple Small Business Routine
You don’t need to spend an hour on this. Here’s a 15-minute monthly P&L review that covers what matters:
- Start with gross margin. Is it up, down, or flat versus last month? Versus last year? If it moved more than a point, investigate why.
- Next, check operating expenses as a percentage of revenue. Is overhead growing faster than revenue? If yes, what drove it?
- Then compare net income to your plan. If you don’t have a budget, set one. A simple monthly target is enough to make this comparison meaningful.
- As a result of that review, flag one thing to discuss with your advisor. A single question — “why did materials costs jump in May?” or “is this marketing spend working?” — is more valuable than passive review.
- Finally, check the trend. Pull three months together. Direction matters more than any single number.
If your current accounting setup doesn’t give you a clean monthly P&L by the 10th of the following month, that’s worth addressing. Timely financials are the baseline — without them, you’re always looking at last quarter’s reality while making this quarter’s decisions.
Not sure what your accounting setup should look like? Our pricing calculator shows what’s included at each tier — no email required. Or take the two-minute package assessment to see what level fits your situation.
Getting your P&L but not sure what it’s telling you?
That’s the conversation. A free consultation with Accounting Freedom means a real look at your numbers — not a pitch. We’ll tell you what we see and what we’d do differently.
Schedule a Free Consultation See Our PricingDisclaimer: This article is provided for general informational purposes only and does not constitute tax, legal, accounting, or financial advice. Every business situation is different. Before acting on anything you read here, please consult with a qualified advisor — including, we hope, us. Reach out to Accounting Freedom for guidance specific to your situation.
About the Author
Frank Fiore, CPA — President & Visionary, Accounting Freedom
Frank Fiore has spent 20+ years helping small business owners in Illinois and Wisconsin turn monthly financials from a tax obligation into a management tool. Accounting Freedom serves clients from offices in Mundelein, IL and Grafton, WI.