Profit and Loss Statement Explained (How to Read Yours in 5 Minutes)

Every line on a P&L, what it is telling you, and the three numbers that should change how you run next month.

A profit and loss statement — P&L, or income statement — answers one question: over a period of time, did the business make money? Revenue at the top, expenses in the middle, profit at the bottom.

Most owners glance at the last number and stop. The middle is where the useful information lives.

The structure, line by line

Revenue (or sales) — everything the business earned in the period, including cash and app payments, not just bank deposits.
Cost of goods sold (COGS) — the direct cost of delivering the work: materials, food cost, subcontractors on a job.
Gross profit — revenue minus COGS. What is left to run the business with.
Operating expenses — rent, insurance, software, advertising, vehicle, utilities, wages. The cost of being open.
Net profit — gross profit minus operating expenses. What the business actually made.

The three numbers to read every month

1. Gross margin percentage

Gross profit divided by revenue. If your margin is falling while revenue is flat, your costs of delivery are rising — material prices, subcontractor rates, or jobs priced too low. This shows up here months before you feel it in the bank account.

2. Your three largest expense categories

Not the total — the top three. Almost every recoverable dollar in a small business is sitting in one of those three lines. Owners who can name them make different decisions than owners who cannot.

3. This month versus the same month last year

Month-over-month comparisons mislead in seasonal businesses. A slow February is only a problem if it is slower than last February. Year-over-year separates a real trend from the calendar.

Why most small business P&Ls are wrong

If any meaningful share of your revenue arrives as cash, Venmo, Zelle, or Cash App, a P&L built only from bank data understates revenue. Profit looks thin, margins look broken, and the owner concludes the business is struggling when the record is simply incomplete.

The fix is not more software. It is logging non-bank income as it happens and combining it with the statement before the report is produced.

P&L versus cash flow

A P&L can show profit in a month when your account balance fell — because a loan payment, an owner draw, or an equipment purchase does not appear as an expense. Read both. Profit tells you whether the business model works; cash flow tells you whether you can make payroll.

A worked example: one month for a two-truck landscaping LLC

Numbers make this concrete. Here is a realistic June for a small crew business that takes both card and cash payments.

Revenue $42,800 — $31,500 in card and ACH deposits, $9,100 in cash and Zelle jobs logged during the month, $2,200 in a check deposited on July 2 but earned in June.
COGS $16,900 — mulch, sod, and plants $9,400; subcontracted tree removal $5,100; dump fees $2,400.
Gross profit $25,900, which is a 60.5% gross margin.
Operating expenses $18,300 — wages $9,600; fuel and truck $3,100; insurance $1,450; equipment repairs $1,900; advertising $850; software and phone $700; office and misc $700.
Net profit $7,600, or 17.8% of revenue.

Read it the way the owner should. Gross margin at 60.5% is healthy for this trade, but last June it was 66% — a six-point slide on $42,800 of revenue is about $2,350 of profit that disappeared into material prices and subcontractor rates. That is the single most important number on the page, and it is invisible if you only look at net profit.

The top three expense lines — wages, materials, and subcontractors — account for $24,100 of the $35,200 spent. Any real cost fix lives in those three lines. Cancelling a $29 software subscription feels productive and changes nothing.

And note the $9,100 of cash and Zelle. If it had never been logged, this P&L would show $33,700 of revenue and a net loss of $1,500. Same business, opposite conclusion.

Three ways owners misread a P&L

Treating an owner draw as an expense. Draws are not expenses; they come out of profit. A P&L that shows draws in operating expenses understates profit and confuses your preparer.
Comparing a five-week month to a four-week month. Some months contain five payroll runs or five Fridays of invoicing. Year-over-year comparison removes that noise.
Buying equipment and expecting the whole cost to show up. A $14,000 mower is usually capitalized and depreciated, so it hits cash hard and the P&L lightly. That is the classic 'profitable but broke' month.

How long a monthly P&L review should take

Five minutes, if the record is already complete. Check revenue against what you believe you sold, check gross margin against the same month last year, scan the top three expense lines, then confirm net profit and the cash you set aside for taxes agree with each other. Anything unusual gets one question written down for your preparer. That is the entire review.

Getting one every month

The LedgerFast Year Book totals the cash, app, and bank activity you enter each month. It shows money in, money out, and net, then exports the year as PDF or Excel. It is $99 per tax year.

Disclaimer

This article is general educational information, not tax, legal, or accounting advice. LedgerFast is not a CPA firm and does not provide tax preparation, filing, audit, or attest services. Financial reporting requirements vary by entity and situation — consult a qualified accountant. Use of LedgerFast is governed by our Terms of Service.

Frequently asked questions

What is the difference between a P&L and a balance sheet?

A profit and loss statement covers a period of time and shows revenue minus expenses for that period. A balance sheet is a snapshot on a single date showing what the business owns, what it owes, and the owner's equity. The P&L tells you how the month went; the balance sheet tells you where you stand today.

How often should a small business review its P&L?

Monthly. A quarterly or annual review is too late to change pricing, cut a cost, or catch a vendor overcharging you. Once the record is complete, the review itself takes about five minutes.

Does a P&L include cash payments?

It should. A P&L is supposed to reflect all revenue earned in the period, not only deposits that touched the bank. If cash, Venmo, Zelle, or Cash App income is not logged, the statement understates revenue and makes margins look worse than they are.

What is a good net profit margin for a small business?

It varies widely by industry — service trades often run 10–20%, while food businesses frequently run tighter. The more useful benchmark is your own history: compare this month's margin to the same month last year rather than to a generic target.

Why does my P&L show profit when my bank account went down?

Loan principal payments, owner draws, equipment purchases, and tax deposits reduce cash without appearing as expenses on the P&L. That is why profit and cash flow have to be read together.