Devon had been reselling for three years before anyone asked to see his P&L. The accountant his neighbor recommended used the phrase casually—"just bring me your P&L and we'll go from there"—and Devon nodded and went home and Googled. He had a sales report. He had bank statements. He had a notes file of expenses. He did not have a P&L, and he was not sure what one looked like.
P&L (profit-and-loss statement) is the standard one-page summary of how a business made or lost money over a period. For resellers, it's the document that turns scattered payouts and receipts into a coherent answer to "how is the business doing." Here's what a P&L looks like, what each section means, and how to put together your first one this week.
The Skeleton of a P&L
Every P&L follows the same five-section structure, regardless of business type:
| Section | What it shows | Why it matters |
|---|---|---|
| Revenue | Gross sales for the period | The top-line number; not your profit |
| Cost of Goods Sold | What you paid for items you sold | Direct cost; varies with sales |
| Gross Profit | Revenue − COGS | Money available to pay operating expenses |
| Operating Expenses | Fees, supplies, rent, mileage, admin | Recurring costs of doing business |
| Net Profit | Gross Profit − Operating Expenses | What the business actually earned |
That's it. Five sections. Every line item maps somewhere into them. The complexity comes from the line items, not the structure.
A Reseller's Monthly P&L: A Worked Example
Devon's actual September:
| Line | Amount |
|---|---|
| Revenue | |
| Gross sales (all channels) | $5,840 |
| Returns and refunds | −$210 |
| Net revenue | $5,630 |
| Cost of Goods Sold | |
| Landed cost of items sold | $2,140 |
| Gross Profit | $3,490 (62%) |
| Operating Expenses | |
| Platform fees and processing | $680 |
| Shipping cost (net) | $145 |
| Booth rent | $400 |
| Mall commission | $240 |
| Supplies | $95 |
| Mileage (340 mi × IRS rate) | $228 |
| Software / admin | $32 |
| Insurance | $28 |
| Total operating expenses | $1,848 |
| Net Profit | $1,642 (29%) |
One page. Every dollar accounted for. Net profit answered the "how is the business doing" question in a way the gross sales report never could.
Why a Sales Report Isn't a P&L
Marketplace sales reports show revenue, sometimes net of fees. They don't show COGS. They don't show your booth rent. They don't show mileage or supplies. They tell you what flowed through the platform; they don't tell you what flowed into your bank account.
A P&L is the difference between "sales were $5,840" and "you cleared $1,642 in real profit." Same month. Different stories.
For the broader framing piece on why revenue ≠ profit, see Why Revenue Isn't Profit.
The COGS Trap
COGS is the most-fumbled section of a reseller P&L. Two common mistakes:
1. Using Average COGS
If you assume COGS is "about 30%" because that's your sourcing target, you flatten reality. Some categories run 20%; some run 50%. Your P&L lies in proportion to that flattening.
2. Counting Purchases Instead of COGS
What you spent on inventory in September is not what you sold in September. COGS is the landed cost of items actually sold this period, not the cost of items you bought this period. They overlap, but they're not the same.
The right formula:
COGS = Beginning inventory + Purchases − Ending inventory
Item-level tracking makes this trivial. Average-cost spreadsheets approximate it badly. The Schedule C piece walks through the same math from the tax angle: What Is Schedule C and Why Resellers File One.
Operating Expenses: The Full Map
Most reseller P&Ls under-count operating expenses. The full categorized expense map—every line item worth tracking—is in Operating Expenses Every Booth Seller Should Track. If your operating expense section looks suspiciously short, the map is the catch-up.
Monthly, Quarterly, Annual: Use All Three
Different time windows answer different questions:
| Window | What it answers | Cadence |
|---|---|---|
| Monthly | "How was last month?" | Every month, fixed day |
| Quarterly | "What's the trend?" | End of each quarter |
| Annual | "What's the business doing?" | Year-end + tax prep |
Devon now runs a 15-minute monthly P&L on the first Sunday of each month, a 45-minute quarterly review, and the annual one at tax time. Three documents, all the same shape, different time horizons.
What a P&L Doesn't Tell You
- Cash flow timing. A profitable month can still leave you cash-short if payouts haven't arrived.
- Inventory health. A great month can hide a graveyard of aged stock.
- Per-hour earnings. Net profit ÷ hours worked is a separate calculation.
- Per-channel performance. Aggregate P&L doesn't show which platform pays best.
The P&L is the spine, not the whole skeleton. Pair it with aging reports, per-hour math, and channel-level breakouts for the full picture.
How to Build Your First P&L This Week
- Pick one month. Last month is ideal.
- List every channel's gross sales. Sum.
- Subtract returns and refunds. Net revenue.
- Pull COGS from your item-level log. If you don't have one, estimate using average COGS and commit to item-level next month.
- Compute gross profit.
- List every operating expense for the month. Use bank statements as your guide.
- Sum operating expenses, subtract from gross profit. That's net.
- Compare gross profit % and net profit % to last month.
First time takes 45 minutes. Tenth time takes 12. The structure becomes muscle memory.
pnl-2026-09.pdf). At tax time, your accountant has twelve clean files instead of a year of receipts.
The Decisions a P&L Drives
A monthly P&L isn't decoration. It changes decisions:
- Sourcing budget — based on average net, not gross.
- Booth size or location — when fixed costs drift relative to net.
- Channel mix — when one platform's contribution to net diverges from its share of revenue.
- Pricing strategy — when gross margin trends down across categories.
- Quitting the day job — when net stabilizes above replacement income.
How to read those signals when you have the document in front of you lives in the companion piece How to Read Your P&L for Better Decisions.
The Document That Changes How You See the Business
Devon now treats his monthly P&L as the most important document his business produces. It's one page. It takes him 15 minutes. It tells him more about the health of his reselling than any payout statement or sales dashboard ever did.
If you've never made a P&L, your first one will tell you something. Probably something you didn't expect. That's the point.