How Much Should You Budget for Amazon PPC?

There are two budgets in Amazon PPC, and they get confused more often than they should. The first is your ad spend: what Amazon charges per click. The second is the management fee: what you pay an agency or consultant to run the account.

This post is about the first one — how to set your ad spend budget. If you're looking for agency pricing, that's a separate question entirely.

Start with break-even ACoS

Your budget doesn't make sense until you know your break-even ACoS, because that number tells you whether your budget is profitable or burning money.

Break-even ACoS is simple: it equals your profit margin.

Take your revenue, subtract cost of goods sold, divide by revenue. That percentage is your margin, and it's your break-even ACoS. Amazon says break-even ACoS is "directly linked to your profit margin" (Amazon Ads ACoS guide).

Example: A product sells for $50. Your cost (product + Amazon fees + shipping) is $30. Your margin is ($50 - $30) ÷ $50 = 40%. Your break-even ACoS is 40%.

At 40% ACoS, you're spending exactly what the ads earn. Go above 40% and you're losing money. Stay below 40% and the ads are profitable.

Set a target ACoS below break-even

Breaking even is not the goal. You want profit.

I set target ACoS at about 70% of break-even to leave room for profit while still being competitive. In the example above, that's roughly a 28% target on a 40% break-even.

Amazon's guidance: "In order to maintain a profit, your Amazon ACOS needs to be lower than your profit margin" (Amazon Ads ACoS guide). Products with thin margins have less room to play with.

Launch budgets vs maintenance budgets

Launch budgets should sit above your maintenance budget.

New campaigns need data before they can optimize. Amazon's algorithms learn from clicks and conversions, and that learning costs money. Underfunding a launch means the campaign takes longer to figure out what works.

Amazon's own budget guide recommends a minimum of $10 per campaign as a starting point.

I've run 500+ campaigns across six brands, including 150+ campaigns for Kensei. Products with higher price points and more competitive categories need more budget than cheaper, quieter ones.

How Amazon's daily budget actually works

Amazon averages your daily budget over the course of a month. A single day can spend well above or below your set amount, and the total for the month still lands around 30× your daily budget.

From Amazon's own policy: your campaign can spend up to 100% more than the average daily budget on any given day, using unspent budget from earlier days (Amazon Ads budgeting policy).

Example: You set a $10 daily budget. One day spends $18, the next spends $7. Over the month, the total is still around $300.

The budget is not paced across the day. If your budget is small and demand is high, the ads can burn through the full amount in the first hour and then stop showing until the next day (Amazon Ads FAQ).

Amazon's minimum daily budget is $1 for Sponsored Products and Sponsored Brands (Amazon Ads FAQ), but Amazon itself recommends at least $10 per campaign.

Worked example: $50 product, 40% margin

Here's how the math plays out on an illustrative product (an example, not a real account):

At a 28% target ACoS, every $100 in ad sales costs $28 in ad spend. That leaves $12 in profit after the ads ($40 margin - $28 ACoS).

Scaled up: if $280 of ad spend drives $1,000 in sales at 28% ACoS, you've made $120 in profit after the ads ($1,000 × 40% margin - $280 spend).

The numbers above are a generic example using the break-even formula. Your category, price point, and competition will shift the specifics, but the method stays the same: know your break-even, set a target below it, and budget enough for campaigns to learn.

Use the budget calculator

The numbers get messy when you're juggling multiple campaigns, different margins per product, and changing ACoS targets.

The PPC budget calculator does the math for you: enter your target ACoS and expected sales, and it shows you the daily and monthly budget you'll need. It also reverses the calculation — enter your budget and it tells you the sales volume you need to hit your target.

The calculator is free, runs in your browser, and nothing you enter gets stored or sent anywhere.

What if my ACoS is above break-even?

That's a separate problem from budgeting. An above-break-even ACoS means the campaigns aren't profitable yet, which could be:

• Still in the launch phase — new campaigns often run hot for the first few weeks before they dial in
• Keywords too broad — generic terms that convert poorly eat budget fast
• Bids too high — starting bids at 2× Amazon's suggestion works for exact-match; it's overkill for broad
• Product-market fit — if nobody's buying even when they click, the offer or listing is the problem

The fixes for that are covered in how to lower your ACoS, campaign structure, and bid strategy. Budget alone won't fix an ACoS problem — it'll just burn money faster.

The minimum nobody mentions

Amazon says the minimum is $1 per day. That's true, but it's not useful.

Amazon recommends a minimum of $10 per campaign per day, and a smaller daily budget can be spent in a few minutes (Amazon Ads budget guide).

If you're launching below $10 per day per campaign, you're either testing on a shoestring or the numbers don't support PPC yet. At that budget, software or DIY makes more sense than paying someone to manage it.

When to raise your budget

Amazon's data shows that raising budgets works best when the campaigns are already performing:

• Schedule-based rules can increase budgets automatically by the percentage you set during specific timeframes, and Amazon's holiday guide suggests raising daily budgets 20 to 30 percent around Black Friday and Cyber Monday (Amazon Ads holiday guide)
• Performance-based rules raise budgets only when campaigns hit a threshold you set, when they notice a campaign is performing well (Amazon Ads budget rules guide)

The math is simple: if a campaign is profitable at $10 per day, it's probably profitable at $15. If it's unprofitable at $10, more budget just loses money faster.

Raise budgets on campaigns that are already hitting your target ACoS. Cut or pause campaigns that aren't.

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That's literally what the free audit is — wasted spend, ACoS, bid structure, back to you as a short video with the 3 highest-leverage fixes.