Amazon Ads for an indie author's first £100 or $100: what to expect

Your first £100 or $100 on Amazon Ads will most likely come back as less than £100 in royalties, and that is the normal result. What you are buying is the numbers you do not yet have: what a click on your book costs, how many clicks it takes to sell a copy, and which search terms those buyers typed. With those three figures you can work out whether a second £100 would make money. The rules below come from KDP Help and Amazon Ads' own pages as they read on 1 November 2026.

What a KDP author can run

KDP Help names two ad types. Sponsored Products appear in shopping results and on product detail pages. Sponsored Brands show a selection of your books. You can advertise books you publish through KDP, co-authored books, and books published outside KDP once a title is claimed in Author Central. KDP titles can be advertised in twelve marketplaces including the US, UK, Canada, Germany and Australia, and audiobook ads are US only.

Sponsored Brands has an entry requirement. KDP Help says it needs a pen name with three unique titles, and Amazon Ads' guide for authors puts it as three or more eligible book titles claimed under the same author's name. A one-book author is therefore limited to Sponsored Products, which is also what KDP Help recommends starting with. You register through the Marketing tab in your KDP account.

Bidding basics

Both ad types are cost per click. Amazon Ads' Sponsored Products page says there are no monthly or upfront fees, and a bid, in the wording of Amazon's author guide, is the price you are willing to pay for a reader to click on your ad. You also set a daily budget, which Amazon's guides suggest starting at $10. The Sponsored Products page notes the daily budget is not paced through the day, so a popular book can spend it by lunchtime.

Automatic targeting lets Amazon pick where the ad shows from your book's details, and the author guide says it helps a new advertiser learn as they go. Manual targeting lets you choose keywords or other books to appear against. Amazon's guide suggests running automatic first and waiting about two weeks before touching the bidding strategies.

There are three of those. Dynamic bids, down only, lowers your bid when Amazon thinks the click is less likely to sell. Dynamic bids, up and down, can also raise it, by up to 100% for placements at the top of the first page of results, so a $0.50 bid can cost $1.00. Fixed bids use your exact bid. For a first campaign, down only means you never pay more per click than you typed in.

Amazon's author guides use $0.60 and $0.75 as example bids, and the console shows a suggested bid for each target. Treat them as illustrations. The right bid for your book comes out of the arithmetic below.

The reporting delay

KDP Help says sales resulting from an ad can take up to 14 days to appear in your reports, and that after you edit an ad the data can take 3 to 14 days to show. Clicks and charges can carry on for 24 hours after you pause or stop a campaign. Campaign metrics do not include royalties from Kindle Unlimited borrows, so if your book is in KDP Select the ad is doing work the report never shows.

So judge nothing in the first week. Give a first campaign two to three weeks of spend, then read the whole period at once.

ACOS, with your own royalty

Amazon Ads defines advertising cost of sales as ad spend divided by ad revenue, multiplied by 100, and its example is $50 spent for $100 of sales, an ACOS of 50%. The catch for authors is in the word revenue. Amazon counts the full sale price of the book, which is not what you receive. Your royalty is a slice of it, so the ACOS at which you break even is well below 100%.

Amazon's page says there is no definitive number for a good ACOS and that break-even is directly linked to your profit margin. For a book, the margin is your royalty divided by the price. Take the royalty from your KDP pricing page rather than a quoted average, because delivery fees and the royalty band change it.

Suppose your ebook is £3.99 and your KDP pricing page shows a royalty of £2.65 per sale. Break-even ACOS is 2.65 divided by 3.99, which is 66%. Below that you make money on the attributed sales, above it you lose.

Now spend the first £100 at an average of £0.35 a click. That buys about 285 clicks. If one click in twenty becomes a sale, you sell 14 copies, Amazon reports £55.86 of sales, your ACOS is 179%, and you receive £37.10 in royalties for your £100. If one click in ten converts, you sell 28 copies for £74.20 in royalties, an ACOS of 89%, still a loss of about £26. Both conversion rates are assumptions to show the working. To break even at £0.35 a click you need a sale every 7.6 clicks, because 2.65 divided by 0.35 is 7.6. Turn that round and it gives you your maximum bid: royalty divided by the clicks it takes you to make a sale. If your first campaign shows a sale every 15 clicks, the most you can pay per click is 2.65 divided by 15, which is £0.18, and most keywords will not sell a book at that bid.

That is why most first campaigns lose money, and why the first £100 is still worth spending: it tells you your real clicks per sale. A £12.99 non-fiction ebook paying over £9 in royalty has far more room, which is one reason the 70% band up to $12.99 matters for ads as well as sales.

What to learn from a losing campaign

• Clicks per sale is the number that sets your maximum bid. Write it down before you change anything.
• The search term report shows the words readers typed before clicking. The terms that produced sales become manual keywords, and the terms that produced clicks and nothing become negative keywords.
• A low click-through rate, with many impressions and few clicks, points at the cover and title, because that is all a reader sees in a results page.
• Clicks without sales mean readers arrived and left, which points at the price, the blurb, the sample or the review count. Fix the page before buying more traffic; how should I price my book covers the price part.

Set the second campaign only when the first has given you a clicks-per-sale figure and a short list of terms that sold. If the bid you can afford is lower than any suggested bid, the money is better spent on the book page or the reader list. What you keep on a £4.99 ebook sold direct shows how the margin changes when you sell from your own page through the Indie Author Toolchest, where the reader pays you most of the price instead of a royalty.

Sources: KDP Help on Amazon Ads and on advertising reports and timelines; Amazon Ads' author's guide to Sponsored Products, Sponsored Brands for authors, Sponsored Products page, ACOS guide and blog post on first book campaigns. All read on 1 November 2026.