Cómo vender más en el Buen Fin y el Black Friday 2026: guía para pequeños negocios

Business · Updated November 11, 2026 · 10 min read

If you own a small business and want to boost sales during Buen Fin, time is short: registration on the official website closes on November 12, 2026, at 11:59 p.m., and the event runs from November 13 to 17. Then comes Black Friday, on November 27. This guide covers the requirements for participation, how to prepare your offers without sacrificing profit margins, what to do in-store and online, and what mistakes to avoid to prevent problems with customers or the Mexican Federal Consumer Protection Agency (Profeco).

If you want to see the event from the consumer’s perspective, first read our guide on the dates, participating stores, and misleading offers of Buen Fin . Understanding what the customer is looking for helps you sell better.

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How to register your business for Buen Fin 2026

Registration is free and can only be done through the official website, elbuenfin.org. According to information published by specialized media outlets, the application period opened on September 8th and closes on November 12th. To participate, you need a legally established company with a valid RFC (tax ID number), and informal businesses are rejected by the system.

To qualify for the Buen Fin raffle, your sales must meet three conditions: have an active Tax Mailbox with up-to-date contact information, have a positive tax compliance opinion, and operate at least one active point-of-sale terminal for electronic payments. Approved businesses must display a QR code in their advertising so customers can verify their registration. Since requirements and dates may change, always confirm the details at elbuenfin.org and through the SAT’s official channels.

1. Go to elbuenfin.org and create your account.
2. Log in and choose the option to add a new company.
3. Fill in your business details and save to receive confirmation.
4. Download the official logo, which can only be used by registered businesses.
5. Place the QR code on your posters, social media, and online store.

Plan your offers before lowering prices

The most expensive mistake during Black Friday is selling at a loss. Before announcing a discount, calculate your actual profit margin: selling price minus the cost of the product, payment processing fees, shipping, packaging, and taxes. A 20% discount may seem small, but if your profit margin is 25%, it almost disappears. Ideally, offer significant discounts on a few products that attract customers and maintain healthy margins on the rest.

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A simple method is to divide your catalog into three groups. Loss leader products carry the biggest discounts and attract visitors. High-volume products have moderate discounts and generate the majority of sales. High-margin products are barely discounted but are offered as complementary items. This way, you prevent a good sales week from ending in a poor profit and loss statement.

Follow the rules to avoid penalties

Profeco has warned businesses in previous editions against creating false sales. Respect the advertised prices, avoid raising prices beforehand only to «lower» them later, provide receipts, and clearly explain the terms and conditions: dates, availability, payment methods, and exchange or return policies. If you advertise an interest-free installment plan, specify which credit cards and banks are eligible. A clear offer not only avoids fines but also builds trust and fosters repeat business.

How to sell more in a physical store

• Advertise your promotions in advance on the door, on social media, and in messages to your regular customers.
• Place the loss leaders in a visible location with legible signs showing the old and new prices.
• Increase staffing during peak hours, usually in the evening and on weekends.
• It offers card and bank transfer payments to avoid losing sales due to lack of cash.
• Always provide proof of payment and check that your terminal is working before Friday.

How to sell more online

According to AMVO data cited by Tienda Nube, online sales during Buen Fin 2025 reached approximately 45.9 billion pesos, demonstrating the importance of e-commerce during this period. If you sell online, ensure your website loads quickly on mobile devices, the checkout process is simple and straightforward, and delivery times are clearly displayed. Many customers abandon their purchases when they discover unexpected shipping costs.

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• Show the final price including shipping or a clear cost from the beginning.
• Use clear photos and complete descriptions, with measurements and materials.
• Prepare quick answers to the most common questions on WhatsApp and social media.
• Check your inventory every day to avoid selling out-of-stock products.
• Send a confirmation message and another one when the package ships.

A simple example of how to calculate a discount

Imagine a clothing store that sells a jacket for 800 pesos. Between the purchase price, payment processing fee, and packaging, each jacket costs them 560 pesos, so they earn 240 pesos per unit. If they offer a 20% discount, the price drops to 640 pesos, and the profit falls to 80 pesos, a third of what it was. To compensate, they need to sell three times as many jackets or combine the discount with a complementary product, such as a scarf with a higher profit margin. Doing this calculation beforehand avoids surprises when it’s time to count the money.

Get ready for Black Friday

Black Friday on November 27th comes ten days after the end of Buen Fin, so many customers will still be comparing prices. If your business has limited stock, don’t spend it all on the first event. Reserve some products for a second campaign and change your messaging: instead of repeating the same offer, offer holiday bundles or gifts. Our Black Friday shopping guide shows how consumers think when planning their budget.

How to better serve your customers during the event

The Black Friday sales period generates a lot of questions in a short amount of time. Prepare clear answers about prices, stock availability, payment methods, shipping times, and returns, and share them with everyone who handles messages. If you use WhatsApp for sales, activate automatic welcome and away messages, and check your conversations at least three times a day. A customer who receives a quick response is more likely to buy, and one who waits two days has probably already bought from another store.

It’s helpful to designate one person to resolve issues such as declined payments, duplicate orders, or incorrect addresses. This allows the rest of the team to focus on selling and delivering. Record each issue on a simple sheet to identify patterns and improve for the next campaign.

How to manage your cash flow

Selling a lot in a short period can leave you short of cash if you don’t plan your supplier purchases. Calculate how much you need to replenish inventory, pay commissions, and cover shipping, and check when your credit card payments are deposited. Many small businesses find they sold well but don’t have the cash to restock. If this is your situation, ask your suppliers for payment terms or limit promotions to products you can replenish quickly.

Common mistakes you should avoid

• Registering late: the deadline cannot be changed and there is no second chance.
• Advertise discounts without calculating the margin.
• Promising stock that you don’t have.
• Not advising of actual delivery times.
• Do not respond to messages during peak demand days.
• Forget the return and exchange policies.

What to do after the event

When the five days are up, the work isn’t over. Thank customers for their purchase with a message, ask for a review, and save the contact information of those who agreed to receive promotions. Review which products sold best, which ones didn’t sell, and how much you actually earned after costs. This information will help you plan your end-of-year campaign with less risk and more clarity.

Frequently Asked Questions

In summary

Registering on time, calculating your profit margins, complying with Profeco regulations, and providing excellent customer service are the four key elements for boosting sales during Buen Fin without putting yourself at risk. If you haven’t registered yet, do it today, as the deadline is November 12th. And remember, this guide provides general information: for tax-related matters, consult your accountant or the SAT (Mexican Tax Administration Service).