How to calculate the real profit of your online store in Mexico

Why isn't revenue the same as profit?

You did MXN 150,000 in revenue last month. That sounds good. The problem is that number is gross income before the list of who takes a cut: your supplier, the carrier, the payment gateway, the platform, Meta Ads and the SAT. Add it all up and real profit could be 15% or it could be negative — and without doing the math you don't know which.

Unlike a brick-and-mortar business, an online store's costs are fragmented across dozens of small line items that don't appear together in any single report. The supplier sends an invoice. Mercado Pago deducts from each payment. The carrier charges per shipment. Meta charges your card every week. None of those systems shows you the net result. That's work you have to do yourself.

How much does Mercado Pago charge per sale in Mexico?

Mercado Pago is the most widely used payment gateway on Tiendanube and Shopify in Mexico. Current rates for online payments:

If you offer interest-free monthly installments (mensualidades sin intereses, MSI), you absorb an additional charge on top:

Source: Mercado Pago Mexico — Selling costs and Interest-free installments. Verify before pricing anything — these rates change several times a year.

How much does a Mexican online store actually earn? A complete example

A product sold at MXN 1,500, paid in full via Mercado Pago with immediate payout:

25.6% looks reasonable. Now turn on 12-month MSI: the financing fee takes another MXN 193. Profit drops to MXN 191 — 12.7% of the sale price. And that's before counting returns, income taxes or staff costs.

What are the most common hidden costs in Mexican e-commerce?

• Interest-free installments (MSI): the customer pays nothing extra, but you absorb the financing cost. At 12 months that's 12.89% of the sale price plus VAT.
• Returns: in fashion and electronics the return rate can reach 20%–30%. Every return includes reverse logistics and reconditioning costs that weren't in the original price.
• VAT on commissions: 16% VAT applies to Mercado Pago's fee, the platform fee and the ad agency fee. It doesn't appear as a line item in the sales report.
• Exchange rate: if you import in USD and sell in pesos, every movement of the dollar changes your margin without you changing the list price.
• Automatic discounts: cart promotions and coupon codes reduce your actual average sale price without you noticing until you review the settlement report.

For a more complete breakdown, see our hidden costs in e-commerce guide.

Why aren't spreadsheets enough to calculate real profit?

The problem isn't the formula — anyone can copy it. The problem is speed and consistency. In a store selling 200 SKUs with 3 payment methods, shipments across the whole country and active campaigns on Meta and Google, keeping that calculation current in Excel takes 2–4 hours a day. And if a formula is wrong or you forget to update a product cost, all the numbers for that month are incorrect.

Spreadsheets also calculate the past. To decide whether to turn off a campaign destroying your margin, you need the number now — not 3 days later when you finish the monthly report. The gap between when a loss occurs and when you detect it is the most expensive gap in an e-commerce business.

How to see real profit from your Mexican store in real time

Escalafy connects your Shopify or Tiendanube store to all your data sources — Mercado Pago, Meta Ads, Google Ads, product costs — and calculates the real profit of every sale the moment it happens. Mercado Pago commissions are deducted automatically based on payment method and number of installments. The ROAS you see in Escalafy is Blended ROAS — the one that includes all channels and all costs, not the inflated number Meta shows in its panel.

The result: you know whether you're making or losing money before you close the day, by product and by campaign. You can turn off an ad or raise a SKU's price the moment the data justifies it. Learn more about how it works at Profit by Product and Real ROAS from Meta Ads.