Black Friday for online stores: the complete preparation guide
Last updated: 26 October 2026
Black Friday 2026 falls on 27 November and Cyber Monday on 30 November. For an online store, they tend to be among the busiest days of the year, but they are also the days when it's easiest to sell a lot and earn little. This guide brings together everything that needs to be ready before those dates: the margin maths, the EU rules on discounts, the website, stock and shipping, measurement, ads on Google and Meta, email and what to do afterwards. Each section ends with a decision you can make this week.
Contents
«#@8»A scenario: the store that sold more and earned less
«#@12»Black Friday 2026: dates and calendar
«#@17»Before the discount, the margin maths
«#@26»What the law says about discounts and online sales
«#@36»Week-by-week preparation timeline
«#@39»Website, checkout and payment methods
«#@42»Stock, shipping and returns
«#@44»Measurement: making sure every sale is counted
«#@48»Ads on Google and Meta
«#@55»Black Friday email marketing
«#@67»On the day and over the weekend
«#@69»After Black Friday: Cyber Monday, Christmas and review
«#@71»Common mistakes to avoid
«#@73»Frequently asked questions
A scenario: the store that sold more and earned less
For example, an online store selling natural cosmetics. In November, the owner decides to apply a 30% discount to the whole catalogue, raises the ad budget in the week itself and sends three emails on the day. Orders triple. In December, when she does the maths, she realises that:
the discount ate almost all the margin on the best-selling products;
half of the extra budget was spent while the campaigns were still adjusting to rushed changes;
the emails sent on the day reached many inboxes only after lunch, and some went to spam;
shipping delays brought return requests and complaints.
None of this is rare. Black Friday rewards stores that treat the campaign as a six-week project rather than a day of discounts. The rest of this guide follows that logic.
Black Friday 2026: dates and calendar
Black Friday is the Friday after Thanksgiving in the United States, which falls on the fourth Thursday of November. In 2026, the dates are:
Black Friday: Friday, 27 November.
Weekend: 28 and 29 November.
Cyber Monday: Monday, 30 November.
Christmas: straight after, when delivery times matter more than price.
Many stores no longer run a one-day campaign. They start with pre-campaigns during November, peak on the Friday and over the weekend and finish on Cyber Monday. The length is a business decision, with effects on margin, stock and legal rules (see below).
The audience is there: according to Eurostat, in 2025, 62% of people aged 16 to 74 in the EU bought or ordered goods or services online in the three months before the survey. The question isn't whether there are online shoppers, but whether your store is ready to welcome them without losing money.
Before the discount, the margin maths
A discount only makes sense if the extra sales make up for the margin you lose on each sale. The maths is simple and worth doing product by product, before deciding on the percentage.
How much more you need to sell to keep the same gross margin:
required sales increase = discount ÷ (gross margin − discount)
Gross margin is the difference between the selling price and the cost of the product, as a percentage of the price. Use the selling price excluding VAT: the VAT you collect is passed on to the tax authority and, if you leave it in the price, the margin looks bigger than it is. For example, a product costs the store €20 and sells for €40 excluding VAT (a gross margin of 50%). With a 20% discount, it drops to €32 and the margin falls from €20 to €12 per unit. To keep the same total gross margin, you need to sell about 67% more units: each unit now leaves €12 instead of €20 (20 ÷ 12 ≈ 1.67; using the formula, 0.20 ÷ 0.30).
In the table: with a 50% gross margin, a 10% discount requires about 25% more sales, a 20% discount about 67% and a 30% discount about 150%. With a 30% margin, a 30% discount leaves the store with no margin at all.
The table doesn't yet include shipping, payment fees, the cost of ads or returns, which also rise with volume. So:
Choose where to discount. High-margin products, slow-moving stock or entry products that bring in new customers. You don't need to discount the whole catalogue.
Consider alternatives to a straight discount. Product bundles, a free item above a certain basket value or free shipping above a minimum. Set that minimum based on your current average order value, so the offer pushes the basket up.
Think about the customer after the sale. A customer who buys again in December and January can justify a lower margin on the first purchase. If you don't know how much a customer is worth over time, use this campaign to start measuring it.
What the law says about discounts and online sales
The rules below apply to online stores selling to consumers in the EU. They come from EU directives that each country transposes into its own law, sometimes using options that the directives allow. This summary is not legal advice.
As a rule, the prior price is the lowest of the last 30 days
Since 28 May 2022, Article 6a of the Price Indication Directive, added by the Omnibus Directive, has required any announcement of a price reduction to show the prior price, which is the lowest price the trader applied during a period of at least 30 days before the reduction. In practice:
Raising the price in November so you can "lower" it later doesn't work. The discount is counted from the lowest price of the previous 30 days, and the reduction has to be real.
You need to be able to identify the prior price. Keep your store's price history (platform exports or product feed logs).
Show the prior price. Next to each product in the campaign, show the new price and the prior price.
Each country may have exceptions. The directive allows countries to set different rules for goods that deteriorate or expire quickly, a shorter period for products on the market for less than 30 days and, for progressive reductions without interruption, the price before the first reduction as the reference. Check the rules of the countries you sell to.
Be careful with pre-campaigns. If you lower a price at the start of November and then put it back up, the pre-campaign price becomes the reference price for Black Friday, because it is the lowest of the previous 30 days. The European Commission's guidance says that repeated campaigns such as Black Friday and Christmas don't count as a single progressive reduction. Plan your pre-campaign dates with this in mind.
Customer rights don't change with the discount
14-day right of withdrawal. In distance sales, consumers can cancel without giving a reason, as a rule within 14 days of the day they receive the product (Consumer Rights Directive). If the store doesn't inform customers of this right, the period can be extended by 12 months. There are exceptions, such as personalised products or sealed goods that are unsealed after delivery and can't be returned for hygiene reasons. There is no special regime for Black Friday.
Legal guarantee of at least 2 years. The seller is liable for any lack of conformity that becomes apparent within at least 2 years of delivery (Sale of Goods Directive), and some countries set longer periods. A discount doesn't reduce this right.
Also review your terms and conditions and returns page before the campaign: deadlines, who pays for collection, how to request a return and how quickly you refund. In very busy weeks, a clear policy saves customer service a lot of contacts.
Week-by-week preparation timeline
The timeline below starts at the end of October. If you start later, do the measurement, margin and website tasks first, as they have the biggest impact on sales.
By 1 November: choose products and offers using the margin maths; save the price history for the last 30 days; confirm purchase tracking; review campaign budgets and targets. Why it matters: it decides whether the campaign makes a profit and whether the ad platforms learn from correct data.
2 to 8 November: prepare creatives, copy and offer pages; define the email sequence; review stock and agreements with carriers. Why it matters: it gives time to get ads approved and avoid stock-outs.
9 to 13 November: upload Black Friday ads and assets by 13 November (at least two weeks ahead, as Google recommends for Performance Max); set up promotional prices in the feed with dates; start building a list of interested people. Why it matters: it avoids ads stuck in review in the decisive week.
14 to 22 November: test checkout and the website under high traffic; reinforce customer service; publish delivery times and the returns policy. Why it matters: it reduces abandoned carts and complaints.
23 to 26 November: teaser emails; early access for customers; seasonality adjustments scheduled, if they make sense. Why it matters: it puts the store on the customer's mind before the peak.
27 to 30 November: monitor stock, budgets and customer service; don't make structural changes to campaigns. Why it matters: it captures demand without wasting budget.
December: Christmas with clear delivery deadlines; campaign review; post-sale emails. Why it matters: it turns one-off buyers into customers.
Website, checkout and payment methods
On high-demand days, a problem that costs one sale in a normal week costs dozens. Before the campaign:
Confirm your hosting capacity. Ask your hosting or platform provider how many simultaneous visits your plan supports and whether a temporary increase is available. On Shopify, the infrastructure is managed by the platform, but installed apps and themes can slow the store down.
Measure speed on the pages that sell. Use PageSpeed Insights on the home page, a category page and a product page. Google considers an experience good when, at the 75th percentile of real visits, LCP is up to 2.5 seconds, INP up to 200 milliseconds and CLS up to 0.1 (web.dev). Compressing heavy images is one of the simplest fixes within the store's own reach.
Make a complete purchase on mobile. From the product to the confirmation email, with every active payment method: cards, PayPal and the local methods your customers use. Repeat after installing any new app or plugin.
Show the conditions before checkout. Shipping, delivery times and returns policy visible on the product page and in the cart. Extra costs, such as shipping and fees, are the main reason for cart abandonment in the Baymard Institute studies, with data from shoppers in the United States.
Create an offers page. A page with only the products on promotion, organised by category, makes browsing easier and serves as a landing page for ads and emails. If you use a countdown, make it real: an offer that "ends today" and carries on the next day costs the store credibility.
Check the SSL certificate and the legal footer. A valid certificate, terms and conditions, privacy policy and the legal information required in the countries you sell to.
Stock, shipping and returns
Forecast demand from your history. Use last November's sales, by product, and how the store has developed since. Without history, start with products that already sell well and quantities you can sell through by Christmas.
Keep stock synchronised across channels. If you also sell on marketplaces or in a physical shop, out-of-date stock leads to selling what you don't have, which means cancelling and refunding.
Agree arrangements with your carrier before the peak. Extra pick-ups, schedules and what happens if volume exceeds forecasts. Having a second shipping option reduces risk.
Only promise delivery times you can meet. If shipping goes from 24 to 72 hours that week, say so on the product page and in the confirmation email. Warning before a delay causes fewer complaints than explaining afterwards.
Prepare for returns. Decide who handles requests, how collection works and how quickly you refund. Return volume follows sales volume.
Automate invoicing. If you still issue invoices by hand, set up the integration between your platform and your invoicing software before the peak, so orders don't get stuck.
Measurement: making sure every sale is counted
Ad platforms optimise with the conversions they receive. If measurement fails on Black Friday, campaigns optimise on wrong data exactly when you're spending the most. Do this check at the start of November:
Make a test purchase and confirm in DebugView or the Realtime report in GA4 that the purchase event was received.
Confirm that the value, currency and transaction ID arrive correctly and that the purchase isn't counted twice, for example when the customer reloads the confirmation page or returns to the store after paying on an external page, such as PayPal's. The transaction ID must be unique for each order and can never be empty: Google Ads and GA4 use it to remove repeated purchases, and GA4 merges all purchases sent with an empty ID into one (Google Ads Help; Google Analytics Help).
Confirm that the purchase conversion is set up in Google Ads and in Meta Events Manager and that it records the test purchases, after each platform's processing time.
In a normal week, compare the store's orders with purchases in GA4. Some difference is normal (blockers, cookie refusals), but a large gap points to a problem to fix before the campaign.
If your store uses cookie consent, also confirm that the banner works on mobile and that measurement respects the visitor's choice.
Ads on Google and Meta
In advertising, the most expensive mistake is leaving everything for Black Friday week. Bidding algorithms need time and data to adjust, and demand rises for everyone at the same time. The minimum ROAS, budget and dates for each platform are in the guide to Black Friday campaigns on Google Ads and Meta.
Google Ads
Budgets and targets in advance. Google recommends adjusting budgets and ROAS targets 4 to 6 weeks before the peak of the holiday season and keeping budget from limiting campaigns on the highest-demand days (Google Ads Help). For the promotion days, Google suggests adjusting the target ROAS a few days ahead and gradually, rather than in one big change (Google Ads Help).
Respect Smart Bidding's learning. Creating or reactivating a bid strategy, adding campaigns to or removing them from a portfolio strategy, or significantly changing the conversions being optimised puts the strategy into learning; changing the budget or the target ROAS or CPA on its own doesn't. The learning status lasts up to 7 days, but performance can take 1 to 2 conversion cycles to stabilise (Google Ads Help). Make structural changes in October or early November.
Seasonality adjustments, only with good reason. Smart Bidding already accounts for seasonal events, so Black Friday on its own doesn't justify an adjustment. Adjustments are for telling Smart Bidding to expect a large rise in conversion rate over a short period. They work best for events of 1 to 7 days and should only be used when the expected change is large (Google Ads Help). They are also available in Performance Max. Google says they can work less well over long periods, above 14 days; for a long promotion, review your ROAS or CPA targets instead.
Assets and asset groups two weeks ahead. For Performance Max campaigns for online stores, Google recommends uploading seasonal assets at least two weeks in advance, so they pass review in time (Google Ads Help).
Promotional prices in Merchant Center. Use the sale_price attribute with the promotional price, keep the price attribute with the regular price and set the period with sale_price_effective_date. The feed price must match the price on the website and at checkout; if it doesn't, products can be disapproved.
Meta Ads (Facebook and Instagram)
Prepare creatives early. Images and videos with the offer, the deadline and the main condition (for example, free shipping above a certain amount), in formats for feed, stories and reels.
Use audiences that already know the store. Website visitors, people who added to cart and past customers already know the brand, which makes them a good audience for a Black Friday offer. Use them only with a valid legal basis and an up-to-date privacy policy, and confirm that the pixel and the Conversions API are sending purchases, as in the measurement section.
Avoid big last-minute changes. Prepare new campaigns in advance and let the ones that already work stabilise before the peak, instead of changing them in the week itself.
Start warming up the audience beforehand. Useful content and lead generation ads during November feed remarketing and the email list for campaign week.
If you don't have time to prepare and monitor campaigns in these weeks, Rocket Fuel Ads' paid advertising management handles the planning, setup and optimisation of campaigns on Google and Meta, also white-label for agencies.
Black Friday email marketing
Email is the channel where the store talks to people who already know it, without paying for every click. To work on Black Friday, it needs three things: permission to send, delivery to the inbox and a sequence that doesn't wear people out. The full plan, with the sending calendar, is in the Black Friday email marketing guide.
Permission to send
Under Article 13 of the ePrivacy Directive, email marketing to individuals requires prior consent. The exception is customers who have already bought from the store: you can send them offers for products or services similar to those they bought, as long as you gave them, when you collected the contact and in every email, an easy and free way to object. Customers who never gave consent or bought should not receive the campaign. Keep a record of every consent.
Delivery to the inbox
Google has tightened the rules for email senders. In Google's sender guidelines:
All senders to Gmail accounts must authenticate their domain with SPF or DKIM and keep the spam rate reported in Postmaster Tools below 0.3%. Google recommends keeping it below 0.1%.
Bulk senders (around 5,000 or more messages in 24 hours to personal Gmail accounts, adding up sends from the primary domain and subdomains) must have SPF, DKIM and DMARC and allow one-click unsubscribe in marketing messages. Anyone who reaches that volume once is treated as a bulk sender for good: a single large send, such as the Black Friday one, can be enough (Google FAQ).
Even if your store doesn't reach that volume, SPF, DKIM and DMARC are the recommended setup. We explain how to set them up in the guide on emails going to spam and SPF, DKIM and DMARC records. If your list has old contacts who haven't opened in a long time, clean it or send them a re-engagement campaign first: a spike in spam complaints in the decisive week hurts the delivery of every email that follows.
A sequence that sells without wearing people out
Early November: invitation to the early access list, with a clear reason to sign up.
The week before: announcement of the dates and the categories on offer.
The day before or Friday morning: campaign launch, with the main offers.
Sunday: reminder for people who clicked on the offers but didn't buy (opens aren't a reliable criterion, as explained below).
Cyber Monday: last day or final offer.
After the purchase: confirmation, shipping information and, weeks later, a related product suggestion.
Segment whenever you can: customers who bought in the last year, prospects who have never bought and people who abandoned their cart. Automated abandoned cart and welcome flows work on their own throughout the campaign. When analysing results, give more weight to clicks and sales than to opens, because some email apps, such as Apple Mail with Mail Privacy Protection, load content in the background and the open rate stops being reliable.
If you want these flows running before the peak, the Rocket Fuel Ads email marketing and automation team helps build the strategy and the automations in the tool you already use.
On the day and over the weekend
Decide who watches what, and when. Stock of the main products, orders, ad spend against forecast and customer service messages, several times a day.
Change the budget, not the structure. If a profitable campaign is limited by budget, increase it. Avoid creating new campaigns or changing the bid strategy mid-campaign.
Remove sold-out products from ads. Update stock in the feed and pause ads for out-of-stock products.
Reply quickly. Fast answers about delivery times, sizes and returns close sales. Prepare template replies for the most frequent questions.
Write down what happens. Problems, peak hours and the best-selling offers are the basis for next year's campaign.
After Black Friday: Cyber Monday, Christmas and review
Cyber Monday (30 November). It can extend the campaign or be a different, online-only offer. If you change prices, apply the same prior price rules.
Christmas. In December, delivery time matters more than the discount. Publish the last order date for delivery before Christmas and confirm it with your carrier.
Review. Compare the campaign's total margin (not just revenue) with that of a normal period, by product and by channel. See how many customers were new and how many buy again in the following months.
Relationship with new customers. A thank-you email, a review request and a related product recommendation, weeks later, turn a discounted purchase into a returning customer.
Common mistakes to avoid
Applying the same discount to the whole catalogue without doing the margin maths.
Raising prices before the campaign to announce a bigger discount: the announced discount always starts from the lowest price of the previous 30 days, so the increase doesn't make it bigger and can make the announcement misleading.
Creating new campaigns or changing bidding in the week itself.
Spending more on ads without confirming that purchases are being measured.
Emailing contacts without permission or old lists that generate spam complaints.
Promising delivery times your carrier can't meet.
Forgetting customer service and returns, which grow with sales.
Frequently asked questions
When is Black Friday in 2026?
Black Friday 2026 is on Friday, 27 November, and Cyber Monday on Monday, 30 November.
How far ahead should I prepare for Black Friday?
Ideally, start 4 to 6 weeks before, especially for ads: Google recommends adjusting budgets and targets in that period and uploading seasonal ads at least two weeks ahead.
Can I raise prices before Black Friday?
You can change prices whenever you like, but in the EU the prior price you announce with a discount is the lowest applied in the 30 days before the reduction. Raising prices shortly before the campaign doesn't increase the discount you can announce.
Can customers return products bought on Black Friday?
Yes. For online purchases in the EU, consumers generally have 14 days to cancel the purchase, on the same terms as at any other time of year, except for the exceptions set out in the law.
Is Black Friday worth it for a small store?
It can be, if you choose the products and offers well. A small store rarely wins with the biggest discount; it wins with the right offer for its customers, deliveries that arrive on time and customers who come back.
What to do this week
If you have to choose where to start, do three things this week: the margin maths for the products you want to put on promotion, the purchase tracking check and the review of your ad budgets and campaigns. These are the decisions with the biggest impact on the result and the ones that need the most time before 27 November.
Want a second opinion on your store's campaigns, measurement and email before Black Friday?
Comments