The P&L, top to bottom. Fifteen minutes and you will never be lost in an accountant's email again.
The income statement — also called the P&L — shows performance over a period. It reads top to bottom, each line subtracting from the one above:
Revenue − COGS = Gross profit − Operating expenses = Operating profit − Interest and tax = Net income
That is the whole document. Everything else is subcategories.
Because your accountant will send you one, investors will ask for one, and a founder who cannot read their own P&L is relying entirely on someone else's interpretation of their business.
It is also where you spot problems: a gross margin that has quietly fallen, an OpEx line that has doubled, a month that looks fine in the bank but is losing money underneath.
Revenue $120,000 Subscriptions $98,000 Services $22,000 COGS $(24,000) Hosting $(11,000) Payment fees $(3,500) Support $(9,500) Gross profit $96,000 (80% margin) Operating expenses $(150,000) Salaries $(112,000) Marketing $(21,000) Software & tools $(9,000) Rent & admin $(8,000) Operating profit $(54,000)
Read it in three moves. Top: revenue $120k, and note the split — most is recurring, which is good. Middle: 80% gross margin, healthy for software. Bottom: losing $54k a month, driven almost entirely by salaries.
That is a normal, fundable picture — a company deliberately spending ahead of revenue. The next question is only ever: how much runway is behind it?
First-time founders often read only the bottom line and miss the story in the middle. A shrinking gross margin is far more serious than a bigger loss, because the loss is a choice and the margin is structural.
The other mistake is comparing a single month to nothing. One month tells you almost nothing — the trend across six is where the information is.
How much revenue is recurring versus one-off? A month propped up by a single project is not the same as a month of subscriptions.
This is the single most informative line. A falling margin means something structural changed — usually more manual delivery.
You are looking for changes, not levels. A line that doubled deserves an explanation.
A $54k monthly loss is fine with 18 months of cash and an emergency with four.
Trends are the point. One month is noise, especially in a small company where one invoice moves everything.
Monthly, and definitely before any board meeting, investor update or fundraise.
Do not use the P&L to answer questions about cash — it is the wrong document. It shows what you earned, not what is in the bank. Use the cash flow statement for that.
Apply this to your own startup in My Full Journey (free account).