October Prime Day Lessons for Black Friday

Update, 25 October 2026: Amazon has extended the Seller Central Black Friday and Cyber Monday deal deadline from 20 October to 13 November. The dates below were correct when this piece was published; the extension applies to sellers, and Amazon still publishes no Vendor Central date.

Prime Big Deal Days 2026 ran on 6 and 7 October, and it answered the question most teams ask in November. What did October Prime Day tell you about Black Friday? Three things, if you read your own numbers: whether your stock arrived and held, whether your deals earned more than they cost, and what will set the price bar for your Black Friday deal (not October's deal price). If you sell to Amazon as a vendor, a fourth answer is still on its way: what the event will cost you once Amazon bills it, which arrives after the event, not during it.

The decision attached to that look-back has a date. The Black Friday and Cyber Monday deal submission deadline in Seller Central is Tuesday 20 October. That is the 3P date, for sellers on Amazon through Seller Central; a 1P vendor, a brand selling to Amazon through Vendor Central, gets no published date and confirms the window with the vendor manager. The week to turn October's results into a Black Friday change is this one.

When were Prime Big Deal Days 2026, and what is still open?

Prime Big Deal Days ran on 6 and 7 October 2026, two days, and it is over; last year's ran on 7 and 8 October. Still open is Black Friday and Cyber Monday: the Seller Central deal deadline and inbound cutoffs are confirmed, the event dates are not announced, and the Vendor Central windows are never published publicly.

Amazon's public notice gave 8 September as the final date for October deal submissions. Amazon then extended it to 22 September for Best Deals, Lightning Deals, Prime Exclusive Discounts (Prime-member price cuts shown on the listing) and coupons, and the notice was never updated. The deadline that counts is the one in your account. The table below separates what Amazon has confirmed from what it has not said.

Deadlines in the next 30 days

These dates were last checked against Amazon's notices between 3 and 9 October, and the returns row on 19 October; where no 2026 date is announced, last year's is shown with the page to watch.

Every confirmed row is a Seller Central date; where Vendor Central and Seller Central diverge, the vendor's window is whatever the vendor manager says it is.

What should you measure now that October Prime Day is over?

Four things, all from your own account rather than from anything Amazon publishes about the event. The first three decide what you submit by 20 October; the fourth decides what you budget for it. Amazon runs the same post-mortem on itself: the category teams watch a Prime event live from a war room, fixing issues as they appear, and the morning after they ask what the input metrics and sales numbers looked like, what went well, where things broke and how to prevent it next time.

1. Did the stock arrive and hold? Check inbound against the October cutoffs: AWD bulk by 2 September, FBA minimal splits by 9 September, Amazon-optimized splits by 16 September. If stock landed after those dates, that is likely where October's out-of-stocks came from. Then list every ASIN that went out of stock during the two days, and for how long.
2. Did the deal earn more than it cost? Event units against your trailing baseline, net of the discount and the fee, and set against any cost to your reference price, the typical price Amazon shows for the item. This is arithmetic you run on your own numbers, not a report Amazon gives you. Look for two failures: a deal that sold out mid-event, wasting the fee and the rank, and a deal that only discounted demand that was coming anyway.
3. What sets your Black Friday price bar? A Prime Exclusive Discount, a Prime-member price cut shown on the listing, must beat the lowest price the item sold at in the past 30 days, counting every seller. Amazon's Holiday 2026 seller notice takes the October event out of that count: Prime Big Deal Days promotional prices are excluded from the 30-day and 60-day lookback window and will not affect the maximum deal price for Black Friday Week and Cyber Monday deals. Every seller's other prices in those 30 days still count, including any discount you run between now and then. The notice speaks of deals and does not name Prime Exclusive Discounts, and it confirms the 30-day window but not the full eligibility rule, so confirm both in your own account.
4. For vendors: what will the event cost once Amazon bills it? Event funding does not show up during the event. It lands later, booked against your cost of goods as contra-COGS, the vendor-funded money Amazon nets against what it pays you, and in deductions that arrive on their own timetable. The October bill section below covers it.

If you sell in Seller Central

Price the Black Friday deal on this year's fee schedule, not last year's. Holiday 2026 deal fees for Best Deals, Lightning Deals and Prime Exclusive Discounts are $100 upfront per promotion plus 1.5% of promotional sales, the variable part capped at $5,000, the same structure as Prime Day 2026; Amazon's notice was titled "Same fees, same eligibility, earlier deadlines". Black Friday and Cyber Monday 2025 ran on flat fees: Best Deal $1,000, Lightning Deal $500, Prime Exclusive Discount $245. The change matters more than the 2025 numbers: a deal budget copied from last year is built on a fee schedule that no longer applies. The $50 early-submission discount closed on 5 September, so a deal submitted now pays the full upfront fee.

Then run the price check. A Prime Exclusive Discount must beat the 30-day low, the lowest price from any seller under any promotion in the past 30 days (for Black Friday Week and Cyber Monday deals, Amazon leaves Prime Big Deal Days promotional prices out; its notice does not say whether that covers Prime Exclusive Discounts), and for an event it must sit a set percentage below the reference price. For the 2025 holiday event Amazon set that at 15%; read this year's figure in your own Deals Dashboard. The reference price is Amazon's Typical Price, the median non-promotional price over the trailing 90 days. Amazon's own announcement excludes peak-event promotions, Prime Day included, from the rule that pulls it down; a promotion pulls it down only when the price sat below that median on more than half the days in the window. So one October deal does not erode your reference price, but a discount running on more than half the days of any 90-day window can, and a plain price cut not run as a promotion counts in full. The 30-day low is also cross-merchant: a reseller's fire-sale price on your item can block your own Prime Exclusive Discount for a month, which is why distribution control sits upstream of promotions. Check eligibility in your own account two to three weeks before the event.

If you sell to Amazon in Vendor Central

October's result is a conversation with the vendor manager, not only a report. I was a vendor manager at Amazon, and one of the areas a vendor manager is goaled on is deals and marketing event participation and the results of them, alongside availability, program participation, selection and the P&L, which includes Net PPM, Net Pure Product Margin: Amazon's product-level margin on your items after the money you fund, excluding ad spend, chargebacks and payment terms. Event results meant traffic, shipping speed, in-stock metrics, deal performance, and performance against forecasts and baselines, and the tracking runs for weeks afterwards: was there a halo effect, did search rank jump, did the item reach a new run rate. Those points make the case for more deal submissions later. Most deal slotting is done by algorithms; where slots were limited, in the curated headline deal slots, strong past deal performance was the case made to the central teams for one. The vendor manager does not decide whether a deal runs again. You do, and Amazon can share the data behind a strong deal to encourage you to resubmit it.

Vendors without a dedicated vendor manager often find event slots are not offered at all, so an unmanaged vendor should not build a Black Friday plan around them.

Pull four report families from Retail Analytics for the read: Sales, Inventory, Traffic and Net PPM. Read Net PPM as a trend and a ranking, never as a number to reconcile to your books: the vendor-funded part inside it is Amazon's estimate, not your actual billing, and Vendor Central no longer shows Sales Discount and contra-COGS as separate lines. One reporting firm documented a $31 million gap between dashboard Net PPM and a vendor's own books. That is one case, not a rate; your own gap is the number to find.

Out-of-stocks cost vendors their promotions: if a down-confirmed purchase order made me worry that a vendor would run out of stock, it could get that vendor's promotions cancelled, which is where purchase order discipline meets the deal calendar. And what could be done about a mid-event out-of-stock depended on the time left and the vendor's supply chain: on the short runway from October we would look at a spot buy with the in-stock team, and if the vendor was also on Direct Fulfillment, shipping to the customer from its own warehouse, we made sure backup DF inventory was in place, because DF lets you sell stock that reached your warehouse before the event but could not get into Amazon's fulfilment centres in time, given Q4 inbound capacity limits and lead times.

What does October tell you about Black Friday?

Three decisions, each tied to a date in the table. October settles them if you let your own numbers do the settling.

(a) Submit or skip Black Friday deals by 20 October, on October's net result. Use the second question above, not last year's fee schedule: the fee structure changed, so last year's deal P&L is no guide. The deal that paid in October on its net result is the one to resubmit; the deal that only discounted demand that was coming anyway is the one to skip. Q4 traffic does work a discount does not: vendors can do very well in Q4 with no discount at all because site traffic spikes, so if your price is already compelling, spend on visibility rather than on discount depth, and keep advertising always on with a gradual ramp into the event, a question of ad budgets and pacing rather than of price.

(b) If October ran out of stock, fix the inventory you can still fix. The remaining Black Friday inbound cutoffs are 14 October for AWD bulk, 21 October for FBA minimal splits and 28 October for FBA Amazon-optimized splits, and the peak fulfilment surcharge period starts on 15 October. For vendors, purchase order or inventory-cap overrides are difficult to get at peak and sometimes impossible; the case is made with data: recent velocity changes, ad spend changes, upcoming promotions. If you are on Direct Fulfillment, backup DF inventory for stock that cannot make the cutoffs is the fallback.

(c) Price. If you sell in Seller Central, October's deal price does not set your Black Friday bar: Amazon's Holiday 2026 seller notice excludes Prime Big Deal Days promotional prices from the lookback for Black Friday Week and Cyber Monday deals. If you sell to Amazon as a vendor, ask your vendor manager whether the same exclusion applies to your deals. What can still set the bar is every other price in the 30-day window Amazon checks, from any seller: a discount you run between now and then, or a reseller's lower price on your item. Amazon's 2026 event dates are not announced, so confirm eligibility in your own account before you submit.

Why is the October bill still coming for vendors?

Because event funding is booked against your cost of goods after the event, the dashboard read on it is an estimate, and the deductions it produces arrive on their own timetable with dispute windows attached. None of that was visible on 7 October.

Contra-COGS is every vendor-funded dollar Amazon books against cost of goods: trade terms, straight-pay agreements, matching compensation and event participation dollars. October's event funding lands there. In my experience Amazon rarely funds the deal: it may help when it has strong margin on the item, or will lose that margin anyway to its own markdowns; otherwise the vendor funds it.

How and when that funding is billed is not something I managed, so take this part from the sources rather than from me. As Amazon's own vendor training described it, per-unit deal funding is billed through a co-op invoice tied to the promotion's funding agreement number; the guides vendors work from add that a Best Deal's placement fee sits under a separate merchandising fee agreement, invoiced after the promotion ends, and that both are deducted from Amazon's purchase-order payments, with a backup report under Payments > Co-op in Vendor Central. The lag is the part nobody pins down: weeks later, on a schedule Amazon sets after the promotion ends, practitioner sources say, and no number holds up. Co-op and similar accruals accrue monthly against net receipts, so the cash leaves your purchase-order payments on a different timetable from the sales it relates to, and finance teams often do not recognise the charge as an event cost when it arrives.

Amazon deductions follow. They can start posting within a couple of weeks of the event, so watch your remittances from this week rather than waiting for a date. A compliance chargeback gives you about 30 days to file the first dispute, counted from the date on the chargeback record in Vendor Central, and missing the window generally closes the case. Amazon publishes no window of its own, and for co-op and accrual deductions the real window is contested, so treat 30 days as the deadline for anything current until your own Vendor Central record shows a longer one. A margin recovery audit is what finds the event charges a vendor never agreed to, because the Net PPM dashboard will not.

What do you decide this week?

Walk the store a week before Black Friday the way a good team walked it before October. Before each large event, my teams walked through the day from the customer's side; at Amazon, as a vendor manager, that meant auditing detail pages, inventory feeds and promotions against inventory a week before Prime Day, a habit I later had agency clients adopt. It forces you to see what the customer sees. One Q4 walk in my category found higher-velocity ASINs missing from the subcategories where they belonged: a partner safety team had mass-suppressed a sizeable number of ASINs across the Furniture category after wrongly flagging them as weapons.

October will hand you more lessons than you can act on before 20 October. Pick the few that change a Black Friday submission, and decide them this week.

If you want October's results read against your Black Friday deal list before the 13 November Seller Central deal deadline, a 45-minute working session on your deal results and margins is the fastest way to get it. Book one here.