The 30-Day Lookback: Why Your October Prices Decide Your Black Friday Deals

Deal Eligibility Looks Backward, Not Forward

Most sellers treat Black Friday pricing as a forward decision: pick a discount, pick a date, submit. Amazon evaluates it backward. A promotional price has to beat your own recent record, so what you charged in September and October caps what you can badge in November, and by the time a submission is rejected or a strike-through quietly vanishes, the history that caused it is already written.

Two mechanics do the damage and they behave differently. One fires on a single promotion. The other needs sustained discounting and costs far more when it goes off. For the wider monitoring calendar, the peak-season monitoring playbook covers the phases; this post covers the eligibility arithmetic underneath them. Nothing here assumes an event date: Amazon has published its Holiday 2026 deadlines but has not announced dates for an autumn Prime event.

What Amazon Has Published, and What It Has Not

The most-quoted numbers in this topic are the least documented ones.

The verified part

Amazon's Holiday 2026 announcement on the public Seller Forums states the operational facts plainly. Deal submissions for Black Friday Week and Cyber Monday opened 8 July and close 20 October. The early-submission discount date was 5 September. FBA inbound cut-offs are 14 October for AWD, 21 October for minimal shipment splits and 28 October for Amazon-optimized splits (Amazon Seller Forums, July 2026).

The same post carries the sentence this entire cluster of articles is built on: "Prime Big Deal Days promotional prices are excluded from the 30-day and 60-day lookback window and won't affect the maximum deal price required for Black Friday Week and Cyber Monday deals."

Two reference-pricing changes are equally well documented. From 23 April 2026, a List Price validates only if the product has been offered at that price at another retailer recently, or purchased as the Featured Offer on Amazon at that price. From 18 May 2026, "if more than half of the days in a product's 90-day Price history are below the non-promotional median price, we'll calculate Typical Price using all sales, including promotional sales" (Amazon Seller Forums, April 2026). Note the carve-out in the same notice: discounts not advertised to customers as promotions count as non-promotional sales and are included in Typical Price.

The unverified part

Now the numbers everyone repeats. "Minimum 15% off for Lightning Deals." "At least 5% below the 30-day low." "20% off the non-member non-promotional price." These circulate across agency blogs as though they were policy, and none of them is traceable to an Amazon-published source.

Amazon's help articles on deals and price discounts are login-gated, so nobody writing publicly can cite them, this post included. The percentage figures in circulation come from seller-forum answers posted by a regular seller account rather than an Amazon moderator. The load-bearing one describes the floor as "the lowest customer bought price for the ASIN in that period including all deals, promotional, and sale prices across all sellers" (seller-forum thread). Plan against it, since it implies coupons and Subscribe and Save prices set your floor, but keep the label attached: it is a seller's report, not policy.

The absence is as informative as the presence. Amazon's public seller promotions guide (May 2026) states rating and selling-plan requirements only. It names no percentage gate and no lookback window at all.

The Lookback Removes Your Floor

The first mechanic is simple and fires on one promotion. Take a SKU with a regular non-promotional price of USD 49.99. In October the seller runs a plain 25% price discount through Seller Central, not submitted as an event deal, putting the live price at USD 37.49.

On 24 November a 60-day lookback reaches back to roughly 25 September, so 37.49 sits inside the window. Any Black Friday Lightning Deal or Prime Exclusive Discount must now be at or below 37.49. The October run did not cap the discount, it removed the floor.

The mechanic decides whether this hurts, more than the depth of the cut. A price submitted through the Prime Big Deal Days event mechanic is excluded from the lookback by Amazon's own wording; the identical price entered as a manual discount is not. If a repricer is also moving prices in this window, the repricing guardrails for peak season matter for the same reason: an automated floor test in October writes into the history the deal engine reads in November.

The Reference Price Removes Your Badge

The second mechanic is slower, less known and considerably more expensive. The 18 May 2026 Typical Price rule triggers when more than half the days in a 90-day price history sit below the non-promotional median. More than half of 90 is 46 days. That is where sellers assume they are safe.

Run it on the SKU above. A 20-day October discount gives a 90-day series of 20 values at 37.49 and 70 at 49.99. The median of 90 values is the average of the 45th and 46th sorted values, and both are 49.99, so the median holds and the strike-through survives. One 20-day promotion does not fire the trigger.

Now use a realistic pattern: 10 discounted days in September, 20 in October, 16 in November before the event. That is 46 of 90. Sorted, the first 46 values are 37.49 and the remaining 44 are 49.99, so the 45th and 46th are both 37.49 and the median flips. The reference price collapses from 49.99 to 37.49. At 45 discounted days it holds at 43.74, halfway between the two. The flip happens at exactly 46.

Here is the bill. To display a 15% badge against the new reference, the seller prices at 37.49 x 0.85 = USD 31.87. Against the true 49.99 that is a real cut of 36.2%, shown to the customer as 15%. Had the reference survived, 15% off 49.99 would have been USD 42.49. Same badge to the customer, and the collapsed reference costs USD 10.62 of margin on every unit.

Keep the two effects apart: the lookback bites once and takes your floor, while the reference-price recalculation needs sustained discounting and takes your badge. If you are still choosing discount depth, the price elasticity guide covers whether the extra units pay for the extra points.

Where the Event Exclusion May Not Reach

This section is our reading of two published rules together, not something Amazon states. Treat it as a risk to check.

The Prime Big Deal Days exclusion is scoped, in Amazon's wording, to the lookback window and the maximum deal price. It says nothing about Typical Price, and the Typical Price rule says that once the more-than-half trigger fires the calculation uses "all sales, including promotional sales."

Read literally, an event price safely excluded from the max-deal-price calculation could still count as a discounted day feeding the reference-price median. If so, routing everything through event mechanics protects only half of what sellers think it protects. The practical response works either way: count discounted days regardless of mechanic and keep the total under 46 in any rolling 90-day window.

Fix your List Price now rather than in November. Since 23 April 2026 it validates only against another retailer's recent offer or a Featured Offer purchase at that price, so a stale MSRP from a supplier sheet will not render. If you enforce pricing floors across resellers, MAP monitoring is what tells you whether an authorised retailer is currently offering the price your List Price depends on.

Walmart and Target Do Not Mirror This

Walmart publishes no lowest-price-in-N-days gate for deal eligibility. It publishes a reference-price rule. Was Price is "the 90-day median price paid by customers for the item on Walmart.com (excluding special promotions like holiday campaigns, limited time deals, rollbacks, and clearance) or the median price offered by Walmart or Marketplace sellers... for at least 28 out of the last 90 days" (Walmart Marketplace).

The structural contrast is the point. Walmart excludes promotions from its median unconditionally. Amazon excludes them until you cross the more-than-half threshold, after which it stops excluding them. Identical discounting behaviour keeps a clean Was Price on Walmart and destroys the Amazon Typical Price.

Target publishes no equivalent price-history requirement for partner deal inclusion that can be found publicly. Plan Target promotions on their own terms rather than importing Amazon's constraints by assumption.

The Rule the EU Already Wrote Into Law

Amazon's lookback is the commercial version of something European regulators made statutory.

Article 6a of Directive 98/6/EC, inserted by the Omnibus Directive (EU) 2019/2161 and applicable since 28 May 2022, requires any announced price reduction to state the lowest price the trader applied during at least the 30 days before it (European Commission guidance). A retailer discounting continuously has nothing left to announce, because the "before" price is the discounted one.

The point goes past compliance trivia. Permanent discounting destroys the ability to advertise a discount, by regulation in one jurisdiction and by marketplace policy in another.

Six Things to Do This October

Pull a 90-day daily price series per ASIN and count the days below the non-promotional median. Past 45 and your strike-through is at risk. The day count is invisible in Seller Central, so nothing else surfaces this.
Audit coupons and Subscribe and Save, not only deals. If the forum description of the floor is right, a quiet 15% coupon running since September is already your maximum deal price, and nobody files coupons mentally as promotions.
Work backward from 20 October. The 5 September early-submission discount has passed, so the live deadline in front of you is the 20 October submission wall.
Accept that October discounting gets no exclusion, and price it accordingly. The Prime Big Deal Days submission window ran 8 July to 8 September, so it closed a month ago and nothing you run now can be routed through it. Every October cut is a plain price discount as far as the lookback is concerned, and every day of it counts. The mechanic choice is a decision for next year's window; this year the only lever left is depth and duration.
Book FBA inbound against 14, 21 and 28 October by split type, so the units are receivable before the deal window opens.
Validate your List Price now. If no other retailer currently offers the product at that price and it has not been purchased as the Featured Offer at that price, it will not display.

If your floor prices and discount ladders are not written down, do that first: the guide to preparing pricing for peak season covers the floor calculation these actions assume. And where the Featured Offer drives your volume, Amazon repricing behaviour generates most of the discounted days sellers later cannot account for.

Keeping a 90-Day Record Seller Central Will Not Give You

Amazon does not hand you a daily price series with the median already computed. You either build the record yourself or find out in November.

Respot does the recording. Paste a product URL and it tracks price and stock per variation, which matters here because a discount applied to one child ASIN and not its siblings produces a different day count per variation.

The free plan covers 5 trackers with 7 days of price history, enough to see how tracking behaves but not to count 90 days. The 30-day history on starter covers the 30-day window, though the 60-day one this post tells you to plan against needs pro. Counting discounted days against a 90-day median needs the 90-day history on pro, or unlimited history on agency (plans and history limits).

The Decision in Front of You

Between now and 20 October you are making one choice, and it concerns October rather than November: how many more discounted days to spend.

Each additional October discount day lowers the floor your Black Friday deal has to beat and moves you closer to the 46-day threshold that erases your reference price. Both effects are invisible while they happen and irreversible afterwards. The seller who holds list price through late October reaches Black Friday with a full 49.99 to discount from; the one running 25% off since September reaches it with 37.49 and the same badge to show for it.

Count your days before committing to another promotion. If you have no record to count, start tracking now so that next October the number is already there.

Frequently Asked Questions

Does a coupon count toward my 30-day lowest price?

Seller-forum answers say yes: the floor is described as the lowest price customers actually paid for the ASIN, including deals, coupons and sale prices across all sellers. Amazon's public promotions guide does not state this, so treat it as a working assumption rather than a documented rule, and audit your coupons before November.

Are Prime Big Deal Days prices really excluded from the Black Friday lookback?

Yes, for prices actually submitted through the event mechanic. Amazon's Holiday 2026 announcement states that 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 required for Black Friday Week and Cyber Monday deals. A plain price discount you run yourself gets no such exclusion.

Is the lookback window 30 days or 60 days?

Both are in play. Amazon's wording on the exclusion names a 30-day and a 60-day lookback window, which implies different deal types read different windows. Plan against 60 days, because that is the one reaching furthest back into your October pricing.

Why did my strike-through price disappear after a long sale?

Most likely the Typical Price recalculation effective 18 May 2026. If more than half the days in a product's 90-day price history sit below the non-promotional median, Amazon recalculates Typical Price using all sales, including promotional ones. That threshold is 46 days out of 90, and repeated discount runs cross it easily.

Does Walmart have the same 30-day rule as Amazon?

No. Walmart publishes no lowest-price-in-N-days gate for deal eligibility. It publishes a Comparison Price rule, where Was Price is the 90-day median price paid, explicitly excluding promotions, limited time deals, rollbacks and clearance. Walmart's exclusion of promotions is unconditional. Amazon's stops applying once you cross its threshold.

Can I raise my price in October to make a bigger November discount possible?

Not reliably, and it carries real risk. A reference price has to reflect a price the product was genuinely offered at, and Amazon's April 2026 List Price validation works against invented former prices. Stop discounting early instead of inflating the base price late.