The ACoS Trap

Most sellers optimize for the lowest possible ACoS (Advertising Cost of Sale). That's wrong. The right ACoS target depends on your product margin and your goal.

Break-even ACoS formula:

Break-even ACoS = net profit margin before ad spend

If your pre-ad margin is 25%, your break-even ACoS is 25%. Anything below is profitable; anything above is a loss.

Target ACoS by goal:

  • Launch phase: 40–60% ACoS — you're buying rank, not optimizing for profit
  • Growth phase: 25–35% ACoS — building momentum, acceptable ad-attributed losses
  • Efficiency phase: <20% ACoS — cash flow positive, scaling winners

Campaign Structure

Use a 3-tier structure:

Tier 1: Branded (Exact)

Exact-match bids on your own brand name. These should have very low bids (you own the traffic) and extremely high ACoS tolerance — buyers already know you.

Tier 2: Competitor (Phrase)

Phrase-match bids on competitor brand names and product ASINs. Higher conversion rate than generic keywords but more expensive.

Tier 3: Category (Auto + Broad)

Auto campaigns for discovery, broad match for category terms. These generate new keyword ideas and rank your product in the category.

Negative Keyword Harvesting

Every week, download your Search Term Report. Any search term with:

  • 10+ clicks and 0 conversions → add as negative exact
  • ACoS 2× above your target → add as negative phrase

In niche.ltd PPC Analytics, this analysis is automated. You'll see a "Negative keyword suggestions" table in the Keywords tab every week.

Dayparting (Bid Schedule)

Not all hours are equally valuable. An average Amazon account shows a 35–40% drop in conversion rate between midnight and 6 AM. Running full bids through the night wastes budget.

In niche.ltd Business plan, dayparting is automated — the AI reduces bids by 50–70% during low-converting hours and increases them during peak conversion windows.

Bid Modifier Strategy

  • Placement: Top of search (first page): Start at +50–100% multiplier. Scale up if ACoS stays within target.
  • Placement: Product pages: Start at +0%. Only increase if conversion rate is strong.
  • Placement: Rest of search: Keep at 0%.

Reading the niche.ltd PPC Dashboard

Navigate to PPC Analytics and look for:

  • ACOS by keyword — filter to find high-spend, zero-conversion terms
  • Impression share — keywords where you show less than 20% of the time need higher bids
  • Match type comparison — usually exact > phrase > broad for efficiency
  • Weekly trend — ACOS improving or worsening week-over-week?