How to read your monthly P&L (without an accounting degree).

What is a P&L?

P&L stands for "profit and loss statement." It's a one-page summary of how much money came in and how much went out during a month. The bottom line, literally the last number, is whether you made or lost money that month.

Most gas station owners get a P&L from their bookkeeper or CPA monthly. Many don't read it carefully because they think you need an accounting degree. You don't. You need to know what seven numbers are, what each one means, and what a healthy version looks like.

The seven numbers that matter

1. Total revenue

How much money came in this month. Includes fuel sales, inside-store sales, lottery commission, ATM surcharge, car wash revenue if you have one. Everything you sold or earned, before any costs are subtracted.

Healthy benchmark: total revenue should track with prior months adjusted for season. A 20%+ drop from same-month-last-year without a clear cause needs investigation.

2. Fuel revenue

How much you took in from fuel sales specifically. This is usually 60–80% of total revenue at an independent gas station. The number itself isn't the story; it's how it tracks with gallons sold and wholesale cost.

3. Inside-store revenue (non-fuel)

Tobacco, beverages, snacks, beer/wine, lottery, food service, general merchandise. Usually 20–40% of total revenue. This is where real profit hides, fuel margins are thin; inside-store margins are wider.

4. Cost of goods sold (COGS)

What you paid for everything you sold this month. The wholesale fuel cost. The tobacco invoices. The beverage deliveries. The snack truck. COGS at a gas station typically runs 75–85% of revenue, high because fuel wholesale cost is most of it.

Healthy benchmark: COGS as a percentage of revenue should stay relatively stable month to month. Big swings (5%+) often mean either invoice timing problems or unrecognized shrink.

5. Gross profit

Revenue minus COGS. The money you have left after paying for what you sold, but before paying anyone or anything else. Gross profit margin (gross profit divided by revenue) at a healthy gas station runs 15–25%.

6. Operating expenses

Everything else you spent money on. Payroll, rent, utilities, insurance, credit-card fees, repairs, supplies, fees. Operating expenses at a typical independent gas station run 4–7% of revenue.

See how much it costs to run a gas station for the line-by-line breakdown.

7. Net profit (the bottom line)

Revenue minus COGS minus operating expenses. The actual money the business made or lost this month. Net profit margin at a typical independent runs 1–3% of revenue. Below 1% you're bleeding. Above 5% is excellent.

What healthy numbers actually look like

Sample healthy monthly P&L, single independent gas station:

REVENUE
  Fuel sales:                       $160,000  (66.7%)
  Inside-store sales:                $65,000  (27.1%)
  Lottery commission:                 $8,500  (3.5%)
  ATM surcharge revenue:              $1,800  (0.7%)
  Other (car wash, vendor rebates):   $4,700  (2.0%)
  TOTAL REVENUE:                    $240,000

COST OF GOODS SOLD
  Fuel (wholesale + freight + fees):$149,000  (62.1%)
  Inside-store (vendor invoices):    $45,500  (19.0%)
  TOTAL COGS:                       $194,500  (81.0%)

GROSS PROFIT:                        $45,500  (19.0%)

OPERATING EXPENSES
  Payroll + benefits:                $26,000  (10.8%)
  Credit-card processing fees:        $4,800  (2.0%)
  Rent:                               $7,500  (3.1%)
  Utilities:                          $2,400  (1.0%)
  Insurance:                          $2,100  (0.9%)
  Repairs and maintenance:            $2,000  (0.8%)
  Vendor service contracts:             $800  (0.3%)
  Bookkeeping and CPA:                  $900  (0.4%)
  Supplies, licenses, other:          $1,200  (0.5%)
  TOTAL OPERATING EXPENSES:          $47,700  (19.9%)

NET PROFIT:                          $(2,200) (-0.9%)

Wait, that's a net loss. The example above shows a station that's near break-even or slightly under. Operating expenses (19.9%) exceeded gross profit margin (19.0%) by less than a point. This is actually common at independent stations, the margin between profit and loss is razor thin.

A station that's comfortably profitable looks like: gross margin 22–25% (better fuel margin or stronger inside-store mix), operating expenses 17–19% (tighter cost control), net profit 3–6%.

Three signs your bookkeeper might be missing something

Most independent gas station bookkeeping is done by a contractor or part-time employee. They do good work most of the time. But three patterns suggest something is being missed:

1. COGS that bounces 5%+ month-to-month.Cost of goods sold should be relatively steady relative to revenue. If it's 78% one month and 85% the next with the same sales mix, either invoices are timing wrong (some recorded late) or shrink isn't being captured.

2. Payroll that doesn't match the schedule.Pull the schedule for the month, sum the hours, multiply by typical wage rates. Within 10–15% of payroll on the P&L is normal (overtime, taxes). 25%+ off suggests ghost employees, payroll padding, or a categorization error.

3. "Miscellaneous" categories over 2% of revenue.Real expenses get categorized; miscellaneous catches things that didn't fit anywhere. A "misc" line at 4–6% of revenue means you don't know what you're spending money on.

The five-minute monthly review

You don't need an hour with your CPA. Five minutes with the P&L gives you 90% of what matters:

1. Total revenue vs. same month last year. Up, down, or flat?
2. Gross profit margin (gross profit ÷ revenue). 15–25% range?
3. Operating expenses as % of revenue. 4–7% range?
4. Net profit margin. Positive? At least 1%?
5. Any specific expense line up materially from prior month?

If all five look healthy, you're done. If any one looks off, that's the conversation to have with your bookkeeper.

Common P&L mistakes

• Not separating fuel from inside-store revenue.Aggregate revenue hides the mix. Fuel revenue going up while inside-store revenue stays flat is a different story than both growing together.
• Treating COGS as a single number.Fuel wholesale cost and inside-store COGS move independently. Separate them on the P&L; bookkeepers who aggregate them hide the leak.
• Reading the P&L only at year-end.By the time you see annual numbers, the problem has compounded. Monthly review catches drift in time to fix.
• Comparing only to last month.Seasonality dominates month-over-month. Always compare to same-month-last-year first; month-over-month second.
• Confusing net profit with cash in the bank.Net profit is an accounting number. Cash in the bank can be very different (loan payments, owner draws, accounts receivable timing).