Prime Big Deal Days 2026 PPC Playbook: Bids & Budgets

Phase 1: Before the event (now to October 3)

Most of the money on Prime event days is made or lost in the week before. Here’s the checklist.

1. Save a CPC baseline, starting today

On August 31, 2026, the FTC and 22 state attorneys general sued Amazon over how the Sponsored Products auction priced clicks. Among other things, the complaint alleges that prices rose far more around Prime Day and Black Friday, ramped in gradually beforehand so the jump was harder to see. Amazon disputes this, and none of it has been tested in court.

Whoever turns out to be right, the practical move is the same. Export weekly CPC by campaign now, before the ramp, and save it somewhere other than Seller Central. When your October CPCs come in, you’ll be comparing against a real number rather than a memory.

2. Check how close your CPC is to your max bid

Divide average CPC by max bid for your high-volume keywords over the last 30 days. If the ratio sits around 0.90–1.00, you’re effectively paying your own bid, so every bid increase shows up almost one-for-one in your CPC. If it sits around 0.50–0.75, you still have headroom. This number decides how aggressive your event bids can safely be. We explain the full test in our breakdown of the auction lawsuit.

3. Recheck your break-even ACoS against real CPCs

Raising bids and budgets on a product only makes sense if you know where it stops making money. If you’re running a deal or a Prime Exclusive Discount, your margin is thinner than usual, so your break-even ACoS is lower too. Recalculate it for every discounted ASIN using the break-even ACoS formula before you set a single event bid.

Worked example: a $30 product with a 30% margin before ads has a 30% break-even ACoS. Discount it 20% to $24 and your costs stay the same, so the margin shrinks to about 12.5% and break-even ACoS drops to 12.5%. Bids that were profitable last week can lose money on that ASIN during the event.

4. Clean up negatives before impressions surge

Impressions jump during Prime events, and so does your exposure to junk search terms. Pull the last 60 days of search terms and add negatives for anything with spend and no sales. Our guides to using search query reports and auditing wasted spend with bulk files walk through both workflows.

5. Confirm inventory

Only push ads on ASINs that can survive a sales spike of 2x or more without stocking out. Running out of stock mid-event wastes the spend and costs you ranking you’ll want back for Black Friday. As EcomCrew notes, a submitted shipment isn’t the same as stock customers can buy. Build your ad plan around units that have actually been received.

6. Tag your top converters now

Build a short list of 10–30 keywords and ASIN targets per product that have converted above your account average over the last 60–90 days. These are the only targets that get the big bid increase during the event. Doing it now means you won’t be sorting search-term reports at midnight on October 6.

Phase 2: The ramp (October 4–5)

Starting about 48 hours before a Prime event, we consistently see impressions rise while clicks and conversions stay flat, so ACoS jumps. Shoppers are browsing and building wishlists, not buying yet.

• Raise budgets 1.5–2.5x on campaigns you plan to push, so you don’t cap out on the early browsing traffic.
• Leave most bids alone. Paying event-level CPCs for window shoppers is the most common way sellers burn budget before the event even starts.
• Don’t react to a two-day ACoS spike. Much of the traffic you buy on October 4–5 converts on October 6–7, so pausing now cuts off sales that haven’t happened yet.
• Check that Sponsored Brands creative and landing pages are live and pointing at ASINs that are in stock and, ideally, carrying a deal badge.

Phase 3: The event (October 6–7)

Budgets: 2–3x, and never cap out a winner

Our standing Prime Day recommendation is 2–3x normal budgets on event days. With clicks up about 70%, a campaign that normally spends its full budget by 6 p.m. will run out by lunchtime. If a campaign is at or under target ACoS, it should never go dark during the event. Missed impressions on your best days are the most expensive kind.

Example: a campaign that normally runs on $100/day goes to $150–$250 on October 4–5 and $200–$300 on October 6–7. It steps back down to $150 on October 8, then returns to $100.

Bids: small everywhere, big only where it’s proven

• About +10% across the board. Competition rises and so does conversion rate, so a modest increase keeps you in the auction.
• +50–100% on your tagged top converters only. Conversion rates up about 35% justify paying more for clicks that reliably turn into sales. They don’t justify paying more for clicks that never did.
• Adjust for your auction reality. If step 2 showed you’re paying close to your full bid, a 50% bid increase is roughly a 50% CPC increase. Stay at the lower end of the range and keep the bigger increases for your most profitable targets.

Our read on placements: top-of-search usually carries the most intent during Prime events. Use a placement adjustment on your top converters instead of raising base bids on everything, so product-page and rest-of-search traffic doesn’t get the same markup.

Monitor by the hour, but act on rules

Traffic during a 48-hour event isn’t evenly spread across the day. Set budget-pacing and bid rules in advance using intraday rules and dayparting. That way campaigns get more budget automatically when they approach their cap, instead of you noticing at 11 p.m. that they went dark at 3.

⚠️ Don’t make pause decisions during the event. Same-day ACoS on October 6 is missing most of the sales those clicks will eventually generate. Unless a keyword is spending heavily on a clearly irrelevant search term, leave it running and review it after the attribution window closes.

Phase 4: The tail (October 8–21)

Step down gradually

Shopping doesn’t stop at midnight on October 7, but event pricing does. Bring budgets down to about 1.5x on October 8 and back to normal by October 10. Return bids to pre-event levels on October 8. If you don’t, you’ll be paying event CPCs for ordinary-day conversion rates.

Retarget the browsers

Many shoppers looked at your listing during the event but didn’t buy. Numerator found that 56% of event shoppers compared prices or products with other retailers. A short Sponsored Display retargeting push over October 8–14 brings them back while they still remember you.

Wait 14 days before judging anything

Sponsored Products and Sponsored Brands use a 14-day click attribution window, and Amazon’s reports are built by order date. Sales from event clicks keep arriving for two weeks. As we explain in attribution window blind spots, a keyword that looks like a 60% ACoS loser on day 5 can finish as a 22% ACoS winner on day 14. Book your real post-event review for October 21.

Measure the whole business, not just ACoS

A successful Prime event often shows a higher ACoS alongside a lower TACoS, because the ad-driven sales spike lifts organic rank and organic sales. Judge the event on TACoS as well as ACoS, and compare organic sales in the two weeks after the event against the two weeks before.

Harvest search terms, then pivot to Black Friday

Event traffic brings new search terms. Move the converters into exact-match campaigns and add the obvious junk to negatives. Then start your Black Friday and Cyber Monday plan. According to EcomCrew’s summary of Amazon’s seller notice, Prime Big Deal Days promotional prices are excluded from the 30- and 60-day lookback windows used to set maximum deal prices for Black Friday Week and Cyber Monday. An October discount shouldn’t limit your November pricing, but keep records of what you ran in case it does.

Which categories to push hardest

Not every category gets the same lift from an October event. The table below puts Ad Badger’s 2026 category benchmarks next to Numerator’s data on what Prime Big Deal Days 2025 buyers actually purchased.