How to build your e-commerce P&L: the practical guide to knowing if you make money

What is a P&L and why does an Argentine e-commerce store need one?

P&L stands for Profit and Loss — also called the income statement or statement of operations. It's the document that sums up how much came in, how much it cost, and how much was left over in a given period (month, quarter, year).

For an e-commerce store, the P&L is the difference between knowing you billed $1,000,000 and knowing you made (or lost) $80,000 that month. Revenue without a P&L is a vanity metric — it sounds good but tells you nothing about the real health of your business.

The costs most people forget in an Argentine e-commerce P&L

An e-commerce P&L in Argentina has specific costs that don't show up in generic tutorials:

• Mercado Pago fees: ~3.99% + VAT on card payments. With interest-free installments, the cost goes up. On 12 installments, it can reach 8-12% of the sale value.
• Mercado Libre fees: between 9% and 16% depending on the category, plus the advertising fee if you use Mercado Libre Ads.
• Shipping costs: fixed or variable depending on zone and weight. Free shipping is a real cost that has to be in the P&L.
• Returns and breakage: in apparel, they can be 5-15% of total sales.
• Agency fee: if you pay a Meta Ads agency, that cost goes in the P&L — many people keep it "separate" and distort the result.
• Inventory inflation: you bought stock at one price, but restocking will cost you more. That hits your future margin.

For a complete list of hidden e-commerce costs, we have a dedicated guide.

What should net margin be for e-commerce in Argentina?

There's no universal number, but here are practical benchmarks:

• Gross margin: the minimum to be viable is 40-50%. Below that, any variable expense eats your business.
• Contribution margin: it has to be positive. If it's negative, every sale you make costs you money.
• Net margin: in a well-run e-commerce business, between 5% and 20%. Above 20% is very good. Below 5% is precarious.

If you don't know your margin, you can't know which range you're in. Revenue won't tell you. The P&L will. To learn how to calculate your contribution margin step by step, we have a dedicated article.

Why Excel isn't enough for an e-commerce P&L

Excel has three fundamental problems for an e-commerce P&L:

• The data is manual: someone has to enter sales from Tiendanube, Mercado Libre and Shopify, the Mercado Pago fees, the shipping costs. That takes hours and creates errors.
• It's always late: by the time you finish updating the month's spreadsheet, the month is over. You make decisions with old data.
• It doesn't have every cost: Mercado Pago fees, installment fees, ad costs by campaign — none of that consolidates itself. You have to do it by hand.

The result is a P&L that's always behind and always incomplete, and it doesn't let you make decisions in time. See why Escalafy replaces Excel for this job.

How Escalafy builds your P&L for you, in real time

Escalafy connects all your data sources (Tiendanube, Shopify, Mercado Libre, Meta Ads) and calculates your P&L automatically:

• Adds up all sales by channel
• Subtracts the costs of each payment method (including interest-free installments)
• Adds shipping and logistics costs
• Includes Meta ad costs by campaign
• Shows your profitability by product and by SKU
• Projects your cash flow for the coming days

The result is a P&L updated to the minute — not at month-end. That lets you make decisions before it's too late.

Frequently asked questions about the e-commerce P&L

How often should I review my P&L?

Monthly at a minimum for a deep review. But the daily profit dashboard should be part of your weekly routine. If margin drops or acquisition cost rises, you need to see it before the problem piles up.

Is the P&L the same as cash flow?

No. The P&L shows whether you made or lost money in a period. Cash flow shows when money actually came in and went out. You can have a positive P&L and negative cash flow because Mercado Pago hasn't released the money from your sales yet. To understand your e-commerce cash flow, we have a dedicated article.

Does VAT go in the P&L?

It depends on your tax status. For monotributistas (Argentina's simplified small-taxpayer regime), the sale price includes VAT — you collect it but don't declare it separately. For responsables inscriptos (VAT-registered taxpayers), VAT sits outside the P&L (it's a tax liability, not business revenue or an expense). Check with your accountant.

What if my P&L is positive but there's no money in my account?

That's the classic case for e-commerce stores selling on installments. Your P&L shows you made $100,000, but Mercado Pago releases that money in 15 monthly installments. Cash flow is negative even though the P&L is positive. That's why Escalafy has a cash flow forecasting module — it shows you when every peso will come in.

Does the salary I pay myself go in the P&L?

It should. If you work in the business without paying yourself a salary, your P&L is overstating profitability. Include your time as a cost — at least the equivalent of what you'd pay someone to do what you do.

Do I need an accountant to build the P&L?

For the monthly operating P&L, no. With your sales and cost data you can build it yourself. An accountant is necessary for the accounting and tax P&L, which has specific rules. For day-to-day business decisions, the operating P&L is what matters.

The first step is knowing how much you make today

You don't need a complex system to start. You need the basic numbers: total sales, product cost, shipping costs and fees, ad spend. With that you can already build a basic P&L that tells you whether you're making or losing money.

If you want to learn how to calculate your e-commerce profitability step by step, we have a guide. And if you want the calculation to be automatic, Escalafy does it for you from day one.

Sources: Keys to understanding your e-commerce P&L (Knownonline, in Spanish) · Income statements for LATAM entrepreneurs (Escalando LATAM, in Spanish)