Amazon Is Auctioning Its Fastest Delivery. Should You Bid?
Fast delivery used to be something Amazon decided for you. Your inventory landed where Amazon placed it and the delivery promise followed. As of this autumn, part of that decision has a price tag, and the price is set by sellers bidding against each other.
As reported in late August 2026, Amazon emailed some FBA sellers inviting them to submit per unit bids for a place in Sub Same Day delivery, its fastest tier. The details below are as of October 2026 and come from seller reports and trade coverage. If you received an invitation, the terms in your own email and in Seller Central are the ones that count.
What is Amazon Sub Same Day bidding?
It is an invitation only programme in which FBA sellers offer a per unit amount to have selected products stocked in Sub Same Day sites. Those sites sit close to large cities and, as reported, deliver in as little as two hours across roughly 2,300 metro areas. Space in them is limited, which is why Amazon is using bids to decide whose products get in.
Participation is voluntary. No bid means your products continue through standard FBA.
You bid a price per unit. According to the invitation wording quoted in trade coverage, you pay only for units that actually ship through Sub Same Day, at the price you bid.
Price is not the only factor. Amazon says it weighs other inputs, including customer feedback, when it evaluates bids.
The bid sits on top of your normal FBA fulfilment fee. It does not replace it.
Why is Amazon charging for speed now?
Because the fastest shelf space is scarce and faster delivery sells more. Amazon says products in the Sub Same Day network have seen 12% higher sales on average than the same products shipping through standard FBA. That is Amazon's own average across the network, not a forecast for your category, and you should treat it as a starting assumption to test rather than a number to budget on.
It also arrives at an awkward moment. Holiday peak fulfilment fees started on October 15, 2026, and the 3.5% fuel and logistics surcharge already applies on top of FBA fees, as reported. A bid is one more layer on a stack that has grown all year.
How do you work out a sensible bid?
Start from contribution margin per unit, not from what you think competitors will bid. The question is simple: how much extra profit does faster delivery create, and what is the most you can pay per unit before that extra profit is gone?
Take your contribution margin per unit after referral fee, FBA fee, the surcharge, peak fees, COGS and average ad cost.
Estimate the sales lift. Use a cautious figure, well under Amazon's network average, until you have your own data.
Remember the bid is charged on every unit that ships through the tier, not only on the extra ones. That is the detail that breaks most quick calculations.
Work out the bid ceiling: the extra units sold, multiplied by margin per unit, divided by all units shipped through the tier.
Bid below the ceiling, review after two to four weeks, and compare sales and conversion for the ASIN against the period before.
An illustration, with made up numbers. Say an ASIN leaves you $6.00 of contribution margin per unit and you assume a lift of 8 extra units on every 100. The extra profit is $48. Spread across 108 units shipped through the tier, that is about $0.44 per unit. Bid above that and faster delivery costs you money. On a product with $2.00 of margin the same maths gives roughly $0.15, which may not be enough to win a place at all.
Which products are worth a bid?
Urgent need products, where the buyer wants it today: chargers, baby essentials, health and household consumables.
ASINs with healthy margin and a strong conversion rate, where extra traffic turns into orders.
Listings that compete with offers already showing same day delivery. Speed is visible on the search page and it influences who gets the click.
Not a fit: thin margin products, slow movers, and items buyers plan ahead for and are happy to wait two days to receive.
There is an inventory cost that the bid does not show. Stock positioned in fast delivery sites is stock you cannot use elsewhere, so a programme like this rewards accurate forecasting. Our inventory management tools comparison covers the platforms that plan stock by location, and the profit analytics tools list covers tracking margin per ASIN after every fee.
For the rest of the Q4 fee picture, see our breakdown of the October 15 peak fee period and its cash flow effect.
Know your number before you bid
An auction punishes sellers who do not know their own margin, because the easy move is to bid whatever wins. Book a free account audit and we will calculate contribution margin per ASIN after the full 2026 fee stack, so any bid you place has a ceiling behind it.
Frequently Asked Questions
What is Amazon Sub Same Day delivery?
It is Amazon's fastest delivery tier, served from smaller sites close to major cities. As reported, it delivers in as little as two hours across roughly 2,300 metro areas and carries a limited selection of products compared with the full catalog.
How does Sub Same Day bidding work for FBA sellers?
Invited FBA sellers submit a per unit bid to have selected products stocked in Sub Same Day sites. According to the invitation wording quoted in trade coverage, sellers pay only for units that actually ship through the tier, at the price they bid. Amazon says factors other than price, including customer feedback, also affect which bids are accepted.
Is Sub Same Day bidding mandatory?
No. As of October 2026 it is voluntary and by invitation. If you do not bid, your products keep shipping through standard FBA with the usual delivery promise.
Does the bid replace the FBA fulfilment fee?
No. The bid is an additional per unit cost on top of your standard FBA fees, the fuel and logistics surcharge and, during Q4, holiday peak fees. Include all of them when you calculate margin.
Does faster delivery really increase sales?
Amazon says products in the Sub Same Day network saw 12% higher sales on average than the same products in standard FBA. That is a network wide average reported by Amazon, and results differ by category and product, so test with a small set of ASINs before committing.
How much should I bid?
No more than the extra profit that faster delivery creates, divided across every unit that ships through the tier. Calculate contribution margin per unit, apply a cautious sales lift and set that result as your ceiling. The team at AMZ Expert can run that calculation from your own fee and sales data.
Which products benefit most from same day delivery?
Products bought to solve an immediate need, such as chargers, baby essentials and household consumables, and products that compete against offers already showing same day delivery. Planned purchases with thin margins usually do not justify the extra cost.
I did not receive an invitation. Am I at a disadvantage?
Not necessarily. As reported, invitations went to some FBA sellers and space in the tier is limited. Keep in stock rates high and delivery promises fast through normal FBA placement, and watch Seller Central for programme updates.
Summary
Amazon now lets some FBA sellers bid per unit for its fastest delivery tier, and the bid is charged on every unit that ships through it. Work out your contribution margin and a cautious sales lift first, set a ceiling, and bid only on products where speed changes the buying decision.
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