What Does P&L Mean? A Simple Profit and Loss Guide for Ecommerce

P&L stands for profit and loss. A P&L statement, also called an income statement, shows a business's revenue, costs and expenses over a specific period and whether it made a profit or a loss. You may also see P&L written as PnL or PNL.

For ecommerce brands, a P&L helps answer a more useful question than "How much did we sell?": How much did we actually keep after the costs of generating those sales?

An ecommerce P&L can include revenue, discounts, refunds, cost of goods sold (COGS), shipping, fulfilment, payment fees, ad spend and operating expenses.

The basic idea is simple:

Revenue - Expenses = Profit or Loss

A store can generate strong revenue, growing order volume and an impressive ROAS while still producing weak profit. This guide explains what P&L means, how to read a profit and loss statement, what each line means for ecommerce and how to use P&L data to make better decisions.

What is a P&L statement?

A P&L statement is a financial report that summarises the revenue, costs and expenses of a business over a specific period, such as a month, quarter or year.

If revenue is greater than expenses, the business records a profit. If expenses are greater than revenue, it records a loss.

A P&L is also commonly called an income statement. It is one of the three main financial statements used to understand a business, alongside the balance sheet and cash flow statement.

At its simplest:

Revenue - Expenses = Profit or Loss

For ecommerce businesses, the calculation becomes more useful when all the costs behind a sale are included. That can mean COGS, discounts, refunds, advertising, shipping, fulfilment, payment processing fees and other operating expenses.

That is why P&L is not just an accounting term. It is a practical way to understand business health.

Is P&L the same as an income statement?

Yes. A P&L statement and an income statement are the same type of financial report. Both show a business's revenue, costs and expenses over a specific period and the resulting profit or loss.

"Profit and loss statement" or "P&L" is common terminology among business owners, while "income statement" is often used in formal accounting and financial reporting. You may also see terms such as "statement of profit and loss" or "statement of operations".

P&L vs balance sheet vs cash flow statement

These reports answer different questions. A business can show a profit on its P&L while still experiencing cash flow pressure because the timing of inventory purchases, supplier payments, customer payouts and other cash movements can differ from when revenue and expenses are recognised.

What does a P&L statement include for ecommerce?

In ecommerce, P&L is about more than a financial report.

It is a way to understand how profitable your store, products, channels and campaigns really are.

A standard P&L looks at revenue, cost of goods sold, gross profit, operating expenses and net profit. Shopify explains that gross profit is calculated by subtracting cost of goods sold from revenue, while net income represents the amount gained or lost during a reporting period after costs and expenses are accounted for.

For ecommerce businesses, the numbers usually include:

Exactly where individual costs appear can vary depending on a business's accounting approach. The important thing is to use a consistent treatment from period to period so changes in margin reflect changes in the business rather than changes in how costs are categorised.

This is where ecommerce P&L becomes useful.

It gives you a clearer view of what is really happening behind your sales numbers.

Why P&L matters for ecommerce growth

Revenue tells you how much your store sold.

P&L tells you whether those sales were worth it.

That difference matters because ecommerce brands often scale based on surface-level metrics. A founder might see rising revenue and assume the business is growing in the right direction. A marketer might see a strong return on ad spend and assume the campaign is profitable. A product might be a bestseller and still have poor margins.

Without a clear P&L, it is easy to confuse activity with progress.

A P&L can help ecommerce brands:

A profit and loss statement can also support decisions around pricing, sales targets and cost management. P&L statements are commonly prepared monthly, quarterly or annually, but ecommerce brands may benefit from monitoring profit more frequently when advertising spend, product costs or margins change quickly.

For ecommerce brands, that pricing point is important.

A product may look successful because it sells often. But if its landed cost is too high, shipping is expensive or ads are required to move it, the product may not be as profitable as it seems.

How to read a P&L report

A P&L report is easier to understand when you break it into sections.

Most P&L reports move from revenue at the top to net profit at the bottom. This is why revenue is often called the top line and net profit is often called the bottom line.

Here are the main parts to understand.

1. Revenue

Revenue is the total amount of money your business earns from sales before expenses are deducted.

For an ecommerce store, revenue usually comes from product sales. It may also include subscriptions, upsells, bundles, gift cards or other income depending on how the store is set up.

Example:

In this example, revenue is increasing each month.

That looks positive, but revenue alone does not show whether profit is increasing too.

2. Cost of goods sold

Cost of goods sold, often called COGS, is the direct cost of the products you sold.

For ecommerce, COGS may include:

Product manufacturing cost
Wholesale purchase cost
Landed cost
Packaging directly tied to the product
Inventory costs, depending on your accounting method

A simple formula is:

Beginning Inventory + Purchases - Ending Inventory = Cost of Goods Sold

COGS matters because it directly affects gross profit.

If your product costs increase but your selling price stays the same, your margin gets smaller.

3. Gross profit

Gross profit is what remains after deducting COGS from revenue.

Net Revenue - COGS = Gross Profit

Example:

In this example, the gross profit is $60,000.

That means the business has $60,000 left before deducting other expenses such as ad spend, shipping, software, wages and fees.

Gross profit is useful because it shows how much room you have to cover the rest of your business costs.

4. Operating expenses

Operating expenses are the costs required to run the business.

For ecommerce, this can include:

• Ad spend
• Shipping and fulfilment
• Payment processing fees
• Subscriptions and apps
• Wages and contractors
• Rent or warehouse costs
• Professional services
• Admin costs

Shopify notes that operating expenses include the costs needed for day-to-day business functions, such as payroll, administrative expenses, marketing, rent and repairs.

This is one of the areas where ecommerce brands can underestimate costs.

A few apps, fulfilment fees, returns, agency fees and paid ads can quickly eat into profit.

5. Operating profit

Operating profit is the amount left after deducting operating expenses from gross profit.

Gross Profit - Operating Expenses = Operating Profit

This shows whether the core business is profitable before other non-operating items, such as interest or tax.

For ecommerce brands, operating profit is useful because it shows whether the store can make money from its normal operations.

6. Net profit

Net profit is the final amount left after all expenses are deducted.

This is the number that shows whether the business actually made money.

Revenue - All Expenses = Net Profit

Net profit is often the most important figure in a P&L because it reflects the overall result of the business.

A store might generate $100,000 in sales, but if total costs are $96,000, the net profit is only $4,000.

That is the difference between looking busy and being profitable.

Ecommerce P&L example

Here is a simple ecommerce P&L example.

At first glance, this store generated $100,000 in gross sales.

After $6,000 in discounts and refunds, net revenue was $94,000. After COGS, ad spend, shipping and fulfilment, payment fees, software and other operating expenses, the business kept $15,000 in net profit.

Using net revenue, its net profit margin is:

$15,000 ÷ $94,000 × 100 = 15.96%

Rounded, the store has a 16% net profit margin.

This is why P&L matters. The $100,000 sales figure tells you how much the store sold. The P&L shows how much it actually kept.

How to create an ecommerce P&L

To create an ecommerce P&L, start with sales for the reporting period, subtract discounts and refunds to find net revenue, subtract COGS to calculate gross profit, then account for the remaining costs of running and marketing the store.

For ecommerce, that usually means making sure ad spend, shipping, fulfilment, payment fees and other operating expenses are included before calculating net profit.

If you want to build one using your own numbers, use MerchantFlow's free Ecommerce P&L Template & Builder. It lets you enter your revenue and costs across six months and automatically calculates gross margin, EBITDA and net profit.

What affects ecommerce profit and loss?

Ecommerce profit changes whenever revenue, product costs or operating expenses change.

Some of the biggest P&L drivers for online stores are changes in demand, COGS, paid advertising costs, shipping and fulfilment, refunds and returns, supplier pricing, currency movements and expenses that have not been tracked correctly.

1. Changes in demand

If demand drops, revenue usually drops too.

This can happen because of seasonality, competition, product fatigue, economic conditions or changes in customer behaviour.

For ecommerce brands, demand can also change quickly based on platform trends, paid ad performance or shifts in search demand.

2. Rising product costs

If suppliers increase prices, your COGS rises.

That reduces gross profit unless you increase prices, reduce costs elsewhere or improve your product mix.

This is especially important for brands importing products, managing multiple suppliers or selling low-margin items.

3. Higher ad spend

Paid acquisition is one of the biggest profit levers in ecommerce.

If ad costs rise but conversion rate, average order value or margin does not improve, net profit can fall even while revenue grows.

This is why return on ad spend can be misleading on its own. A strong return on ad spend does not automatically mean the business is profitable after COGS, shipping, refunds and operating costs.

4. Shipping and fulfilment costs

Shipping and fulfilment costs can quietly reduce margin.

Free shipping, split shipments, 3PL pick and pack fees, packaging costs and returns handling can all affect profitability.

A product that looks profitable before fulfilment may be far less attractive once fulfilment costs are included.

5. Refunds and returns

Refunds reduce revenue.

Returns can also create extra costs through reverse logistics, damaged inventory, customer support and replacement shipping.

For some ecommerce categories, returns can significantly change product-level profitability.

6. Currency and supplier changes

If you buy inventory in one currency and sell in another, exchange rate changes can affect product costs.

This is especially relevant for stores importing goods or working with overseas suppliers.

7. Untracked expenses

One of the biggest P&L risks is not tracking all expenses properly.

If your P&L excludes certain costs, it may show a profit that is not really there.

Common missing costs include:

• Payment fees
• Packaging
• App subscriptions
• Agency fees
• Freight costs
• Return costs
• Influencer payments
• Ad platform spend that is not attributed correctly

A P&L is only as useful as the data behind it.

How to analyse your P&L

A P&L is not just something to file away at the end of the month.

Used properly, it can help you make better decisions.

Here is a practical way to analyse it.

1. Compare revenue and net profit

Start by looking at whether revenue and profit are moving in the same direction.

If revenue is increasing but net profit is flat or falling, something is eating into margin.

That could be ad spend, discounts, shipping, product costs or operating expenses.

2. Review gross margin

Gross margin shows how much money is left after product costs.

Formula:

Gross Profit ÷ Net Revenue × 100 = Gross Margin

Using the ecommerce P&L example above:

$56,000 ÷ $94,000 × 100 = 59.6% gross margin

That means approximately 59.6 cents of every dollar of net revenue remains after COGS, before the remaining operating costs are deducted.

A falling gross margin may mean product costs are increasing, discounts are too aggressive or lower-margin products are making up more of your sales.

3. Review net profit margin

Net profit margin shows how much of every dollar of revenue becomes profit.

Formula:

Net Profit ÷ Net Revenue × 100 = Net Profit Margin

Using the same example:

$15,000 ÷ $94,000 × 100 = 15.96%

Rounded, the business has a 16% net profit margin. In practical terms, it keeps about 16 cents in net profit for every dollar of net revenue.

This helps you understand the actual efficiency of the business.

4. Look at ad spend as a percentage of revenue

For ecommerce brands, ad spend is often one of the largest controllable expenses.

A useful metric is:

Ad Spend / Revenue x 100 = Ad Spend Percentage

If ad spend is growing faster than revenue, your profitability may come under pressure.

This is where blended return on ad spend can help, but it should still be reviewed alongside profit.

5. Compare products, not just the whole store

Store-level P&L is useful, but it can hide product-level issues.

Example:

Both products generated the same revenue.

But Product B created much more profit.

This is why ecommerce brands should not only ask, “What sold?”

They should ask, “What sold profitably?”

6. Compare performance over time

A single P&L tells you what happened in one period.

Comparing P&L reports over time helps you spot trends.

Look for:

• Revenue growth
• Gross margin changes
• Net profit margin changes
• Ad spend efficiency
• Rising fulfilment costs
• Increasing refund rates
• Products becoming less profitable

The goal is not just to know whether you made money last month.

The goal is to understand why.

Manual vs automated P&L tracking

There are two main ways ecommerce brands track profit and loss.

Manual P&L tracking

Many brands start with spreadsheets.

This can work when the business is small and costs are simple.

Manual tracking usually involves exporting data from Shopify, ad platforms, payment processors and accounting software, then combining it into a spreadsheet.

The problem is that ecommerce data is often scattered.

Revenue is in Shopify.

Ad spend is in Google Ads, Meta Ads, TikTok Ads or Snapchat Ads.

Product costs might be in Shopify, a spreadsheet or supplier records.

Shipping and fulfilment costs may be in a 3PL invoice.

Payment fees may sit inside your payment provider.

Refunds and discounts need to be matched back to orders.

Manual tracking can become slow, messy and easy to get wrong.

Automated P&L tracking

Automated P&L tracking connects your key data sources and calculates profit more regularly.

For ecommerce brands, this can make P&L more useful because it becomes part of daily decision-making rather than something reviewed weeks later.

Automated profit tracking is particularly useful for ecommerce because revenue, COGS and advertising data can change every day. Bringing those numbers together reduces the need to manually rebuild spreadsheets and makes profitability easier to monitor between formal accounting periods.

This matters because ecommerce operators often need to make fast decisions.

• Should we increase ad spend?
• Should we discount this product?
• Should we reorder this SKU?
• Should we pause a campaign?
• Should we raise prices?
• Should we keep pushing this bestseller?

A delayed P&L can tell you what happened.

A live profit view can help you decide what to do next.

How MerchantFlow helps ecommerce brands track P&L

MerchantFlow brings the data behind ecommerce profitability into one place. It combines store revenue with COGS, refunds, ad spend, shipping, fulfilment, payment fees and other expenses so merchants can see store-level and product-level profit without manually rebuilding the same spreadsheet every week.

That makes it easier to answer questions such as which products are actually making money, whether increased ad spend is improving profit and which costs are reducing margin.

You can start with the free Ecommerce P&L Builder if you want to calculate your numbers manually, or use MerchantFlow to track the same profitability data continuously across your store.

Common P&L mistakes ecommerce brands make

1. Assuming revenue means profit

Revenue is only the starting point.

A high-revenue store can still have weak profit if costs are too high.

2. Only looking at return on ad spend

Return on ad spend compares revenue to ad spend.

It does not automatically include product costs, fulfilment costs, transaction fees, refunds or operating expenses.

That means a campaign can look good in an ad platform while producing weak profit overall.

3. Not updating COGS

If your product costs are outdated, your P&L will be wrong.

This can lead to poor pricing, bad campaign decisions and incorrect product profitability analysis.

4. Ignoring small costs

Small costs add up.

Payment fees, packaging, apps, samples, influencer gifting, returns and agency fees can all reduce margin.

5. Reviewing profit too late

A month-end P&L is useful, but it may be too late for fast-moving ecommerce decisions.

If ad spend is climbing or a product margin is shrinking, waiting until the end of the month can be expensive.

6. Not looking at product-level profit

Store-level profit can hide product-level problems.

Some products may be carrying the business while others quietly reduce margin.

Best practices for ecommerce P&L tracking

To make your P&L more useful, keep it practical.

Track revenue, but do not stop there.

Keep COGS updated.

Include all major variable costs.

Separate refunds and discounts from revenue.

Track ad spend across every paid channel.

Review gross profit and net profit.

Compare product profitability.

Check trends over time.

Use monthly P&L reporting for financial review.

Use live or weekly profit tracking for operational decisions.

A strong ecommerce P&L should help you make decisions, not just understand the past.

How to use your ecommerce P&L to make better decisions

P&L is one of the most important concepts in ecommerce.

It shows whether your business is actually profitable after costs, not just whether your store is generating sales.

Revenue can look impressive.

Order volume can look exciting.

Return on ad spend can look healthy.

But none of those metrics tell the full story on their own.

A clear P&L helps you understand what is really happening across revenue, product costs, ad spend, fulfilment, refunds, fees and operating expenses.

For ecommerce brands, that clarity matters.

Because the goal is not just to sell more.

The goal is to keep more of what you sell.

Want to see what that looks like with your own numbers? Use MerchantFlow's free Ecommerce P&L Template & Builder to calculate revenue, margins and profit.

Profit and Loss (P&L) FAQs