Black Friday / Efsane Cuma E-Commerce Preparation

In 2026, Black Friday officially falls on Friday, November 27, and the campaign ends at 11:59 PM that night — though this window can be extended at the platform's discretion. Efsane Cuma, meanwhile, is Trendyol's own branded campaign period: Super Discount Days are planned for November 8-11, 2026, and the Efsane Günler (Legendary Days) campaign for November 22-25. In other words, Black Friday is no longer a single day but a festival spread across the whole month of November. As a seller, you should prepare not for one date but for a three-week window: early-bird discounts, the main campaign day, and the extension period. The 'festival month' initiative reportedly under discussion at Turkey's Ministry of Trade is also moving toward formalizing this multi-day model.

Dates may change based on platform announcements; check your seller panel before the campaign.

The most common loss during Black Friday doesn't come from the discount itself but from stock errors. If you sell the same product on Trendyol, Hepsiburada, and your own Shopify store at the same time, stock that sells out on one channel can keep showing as available on the others — leading to over-selling penalties and order cancellations. At least two weeks before the campaign, raise safety stock above normal levels for critical products, arrange a 48-hour emergency reorder agreement with your supplier, and confirm whether your warehouse will run weekend shifts during campaign week. Tracking this sync manually across multiple marketplaces around the clock isn't realistic; Ecomiro's Stock Sync module automates this risk by matching stock movement across channels in real time.

• Safety stock — Raise stock on your top 20 best sellers to 30-50% above normal before the campaign
• Channel sync — Bring stock update lag across all marketplaces down to under 5 minutes
• Supplier agreement — Line up a supplier who can deliver extra batches within 48 hours if demand spikes
• Warehouse shifts — Plan weekend packing shifts in advance for the November 27-30 week

Read the stock & warehouse guide

Setting your discount rate at random can wipe out your profit margin. Field data shows that 10-20% for electronics and appliances, 30-50% for apparel and accessories, and 20-35% for cosmetics and home textiles both draw clicks and protect margin. The method experts recommend, instead of cramming everything into one day, is to build a campaign window: fix your price at the normal level 5-7 days before the campaign starts, then apply a staged discount. This keeps platform algorithms from lowering your trust score and means you don't have to compete with the same ad budget every single day. Rather than calculating the right rate by hand across hundreds of SKUs, set a clear floor price that protects your margin in advance — and never drop below that floor during the campaign.

Carriers get overloaded during campaign week too, and customers usually treat delays that aren't even your fault as your problem. Try to get your carrier hand-off time under 24 hours before the campaign, and confirm extra vehicles and staff with your carrier for campaign week. Even if your live chat and WhatsApp line normally responds in 2-3 hours, you need to bring that down to under 30 minutes during campaign week, because customer patience is at its lowest during this period. Shipping SLA, return/exchange speed, and support response time together form a trio that influences the purchase decision just as much as the discount rate does. Since order volume can climb to 3-5x normal during campaign week, running through your packing and hand-off process once in advance makes a big difference.

During campaign week, CPC — cost per click — usually climbs to 2-3x normal, because everyone is trying to show up in the same storefront at the same time. Start planning your budget 10-14 days before the campaign, not on campaign day itself: run low-budget brand-awareness ads early on, then direct 40-50% of your budget to your top 10-15 best-selling SKUs on the main campaign day. If you don't raise your daily budget cap to at least double the normal amount for campaign week, your ads can run out by the afternoon and drop out of the storefront during the peak evening sales hours. Track spend by cost per order, not just cost per click, and don't hesitate to pause campaigns that go above 25% even in the middle of the campaign.

Explore the Trendyol ads guide

The first 10-14 days after Black Friday are when return requests peak; industry averages show that products sold during the campaign period can see a return rate 5-10 percentage points higher than normal. The three most effective steps to reduce this wave are: giving clear size, measurement, and color information with photos in your product descriptions, not skipping quality control on stock brought in before the campaign, and logging return reasons in categories such as sizing, dissatisfaction, and damage. That last step is the one most often overlooked — because without knowing which product was returned for which reason, you can't properly prepare for next year. Ecomiro's Analytics & Reports module compares pre- and post-campaign sales and return data by channel, showing clearly what you need to change on which product before the next Black Friday.