How Much Should Authors Spend on Amazon Ads?

Amazon Ads operate on daily budgets, but smart authors think in monthly terms. Your daily budget controls spending velocity, but your monthly allocation determines campaign sustainability and data collection speed.

For new campaigns, plan for 60-90 days of consistent spending before making major optimisation decisions. Amazon's algorithm needs 2-3 weeks to stabilise, and you need 4-6 weeks of performance data to identify profitable keywords and audience segments. This means if you can only afford $300 total, you're looking at $3-5 daily budgets, not $20 daily budgets that exhaust your funds in two weeks.

Consider your cash flow cycle. Most indie authors see irregular income, so front-load your advertising spend during months when you have buffer funds available. A $600 campaign run over two focused months often outperforms the same $600 spread across six months at minimal daily spend.

The minimum viable daily budget varies by competition level in your genre. Romance and thriller campaigns can generate meaningful data at $5-10 daily because of high search volume. Business and academic nonfiction typically need $15-25 daily minimums due to higher cost-per-click and lower search frequency.

Launch campaigns require different budget allocation than evergreen campaigns because their goals differ fundamentally. Launch campaigns prioritise visibility and initial sales velocity to trigger Amazon's recommendation algorithms. Evergreen campaigns focus on sustained profitability and long-term keyword ownership.

For launch campaigns, plan to spend 2-3x your normal monthly advertising budget over 4-6 weeks. This front-loaded approach maximises your book's chances of gaining organic momentum during the critical first month. If your typical monthly ad budget is $400, allocate $800-1200 for your launch campaign period.

Launch campaign daily budgets should be aggressive enough to capture your target keywords before competitors do. Start with daily budgets 50-100% higher than your planned evergreen spend, then scale down to sustainable levels after 30 days. This aggressive start often pays for itself through improved organic ranking and sustained visibility.

Evergreen campaigns optimise for efficiency over speed. Your daily budget should be sustainable indefinitely while generating positive ROI. Most successful evergreen campaigns operate at 20-35% ACOS, meaning every $100 in ad spend generates $285-500 in book sales. Calculate your profit margin per book to determine your maximum sustainable ACOS.

Don't run launch and evergreen campaigns simultaneously for the same book. The budget competition between your own campaigns drives up your costs and confuses performance data. Plan your launch campaign, measure results, then transition to evergreen budgets based on what you learned.

Profitable Amazon Ads campaigns follow predictable ROI patterns, but these patterns vary significantly by genre and campaign maturity. Understanding these benchmarks prevents premature budget cuts and identifies when to scale successful campaigns.

New campaigns typically show 45-70% ACOS in their first 21 days while Amazon's algorithm learns your audience. This learning period is expensive but necessary. Campaigns that achieve 35-45% ACOS by day 30 usually optimise to 20-30% ACOS by day 60 with proper keyword management. Budget for this learning curve rather than expecting immediate profitability.

Fiction campaigns often achieve better ACOS than nonfiction because of lower competition and higher impulse purchase rates. Romance and thriller campaigns regularly achieve 15-25% ACOS after optimisation, while business and self-help campaigns typically stabilise at 25-40% ACOS. Price your books and set your ACOS targets accordingly.

Scale your budget when campaigns consistently hit your target ACOS for 14+ days. Increase daily budgets by 25-50% increments rather than doubling overnight. Amazon's algorithm needs time to adjust to increased spend without losing efficiency. Monitor performance for one week after each budget increase before scaling further.

Never scale poorly performing campaigns hoping volume will improve efficiency. If a campaign runs at 60%+ ACOS after 45 days, the issue is targeting or positioning, not budget size. Fix the fundamentals before investing more money.

Our budget optimisation process starts with genre-specific competitive analysis to establish realistic CPC and ACOS benchmarks for your book. We analyse your profit margins, sales goals, and available budget to create sustainable 90-day campaign plans that account for Amazon's learning periods.

We separate launch and evergreen budget strategies from day one. Launch campaigns get aggressive daily budgets designed to capture market share quickly, while evergreen campaigns focus on long-term profitability. Each campaign type gets distinct keyword strategies and performance targets aligned with their goals.

Our scaling decisions rely on 14-day performance windows and profit-per-sale calculations rather than arbitrary ACOS targets. When campaigns consistently hit profitability benchmarks, we increase budgets incrementally while monitoring efficiency metrics. This systematic approach prevents the budget waste that comes from emotional scaling decisions.