How to Read a Profit and Loss Statement: Every Line Item Explained With Examples (2026)
A complete walkthrough of a $510K service business P&L. Every line item defined, what healthy looks like, red flags to watch, and what the P&L does not tell you.
The Example P&L We Will Walk Through
Marketing agency, 8 employees, annual P&L for 2025. Let's analyze every line.
| Line Item | Annual | % Revenue |
|---|---|---|
| Revenue | ||
| Retainer Clients (6) | $360,000 | 70.6% |
| Project Work | $150,000 | 29.4% |
| Total Revenue | $510,000 | 100% |
| Cost of Goods Sold | ||
| Subcontractor Fees | $62,000 | 12.2% |
| Production Costs | $14,500 | 2.8% |
| Gross Profit | $433,500 | 85.0% |
| Operating Expenses | ||
| Salaries and Benefits | $138,000 | 27.1% |
| Rent and Utilities | $42,000 | 8.2% |
| Marketing and BD | $35,000 | 6.9% |
| Software and Tools | $18,000 | 3.5% |
| Insurance | $8,400 | 1.6% |
| Professional Fees | $12,000 | 2.4% |
| Travel and Entertainment | $14,500 | 2.8% |
| Other Expenses | $9,600 | 1.9% |
| EBITDA | $164,400 | 32.2% |
| Net Income | $156,000 | 30.6% |
Excellent for an agency. 85% means for every dollar billed, 85 cents goes to covering overhead and profit. Subcontractors are 15.0% of revenue - within normal range.
Strong for an 8-person agency. Industry average is 15-20%. This business keeps $156,000 of every $510,000 billed after all costs.
Marketing spend at 6.9% of revenue is high for an agency that primarily grows through referrals. Worth reviewing ROI on this spend.
Line-by-Line Explanation
Red Flags to Watch
Gross margin declining month after month - your direct costs are growing faster than prices. Investigate COGS line items.
Revenue growing but net margin shrinking - overhead is expanding faster than the business. Find and address the cost drivers.
Single customer representing more than 25% of revenue - concentration risk. Losing this client would be catastrophic.
Negative net income for three or more consecutive months without a clear, temporary explanation.
Any expense category growing more than 2x faster than revenue without a strategic reason.
Revenue spikes followed by crashes with no seasonal explanation - could indicate lumpy project work or revenue recognition issues.
Owner compensation that is either very low (hiding true costs) or very high relative to net income.
Cash Basis vs Accrual Basis
| Question | Cash Basis | Accrual Basis |
|---|---|---|
| When is revenue recorded? | When cash is received | When earned (invoice date) |
| When are expenses recorded? | When cash is paid | When incurred (bill date) |
| Who uses it? | Most small businesses | Larger businesses, GAAP required |
| IRS requirement? | Under $25M revenue | Over $25M average gross receipts |
| Complexity | Simpler | More complex |
| Accuracy | Shows actual cash timing | More accurate picture of economics |
For most small businesses, cash basis accounting is simpler and acceptable for tax filing. If you have significant accounts receivable (customers who owe you money) or accounts payable (bills you owe), accrual accounting gives a more accurate picture of business performance. Talk to your accountant before switching - once you elect a method, changing it requires IRS approval.
What Your P&L Does NOT Tell You
A profitable business can run out of cash if customers pay slowly. A cash flow statement shows when money actually moves.
The P&L doesn't show debt levels, cash reserves, inventory value, or what the business owes. You need a balance sheet for that.
Even with strong revenue, heavy dependence on 1-2 customers is a major risk not visible in the P&L totals.
Strong past revenue doesn't guarantee future revenue. Backlog, recurring vs one-time revenue, and customer retention are context the P&L alone misses.
Whether the business owns valuable equipment, real estate, or IP is not shown on the P&L - only the depreciation expense is.
If the owner works full time but takes a $40K salary in a business generating $800K revenue, net income is artificially high.