There's a pattern that shows up in almost every Amazon PPC audit we run. A seller is running 800 keywords across 12 campaigns. Their ACOS looks manageable at 22%. Their TACOS is 19%. But when we map each keyword to its actual search intent, we find that 60–70% of their spend is on Tier 2 and Tier 3 keywords — terms that generate impressions, occasional clicks, and almost zero purchases. They are spending to rank for terms that don't convert, while underinvesting in the exact phrases their buyers actually use at the moment of purchase.
The fix isn't running fewer keywords. It's running the right ones, in the right match types, at the right bid levels — based on where each keyword sits in the buyer's decision journey.
The Three-Tier Intent Framework
Amazon search intent falls into three distinct tiers. Every keyword you bid on belongs to one of them — and each tier requires a different strategy, bid structure, and success metric.
Tier 1 — Purchase Intent
The buyer knows what they want and is ready to buy. These are high-specificity, brand-adjacent, or solution-specific terms. They convert at 2–4× the rate of Tier 2 keywords. ROAS is highest here. Competition is also highest — but justified.
Examples: "magnesium glycinate capsules 400mg", "bamboo bath mat non-slip 24x36", "protein powder for women vanilla 2lb"
Tier 2 — Research Intent
The buyer is comparing options or learning what to look for. These are category-level, comparison, or "best of" terms. They convert lower than Tier 1 but are critical for building organic rank and feeding retargeting pools. Invest with discipline — match type matters here.
Examples: "best magnesium supplement", "non-slip bath mat options", "high protein powder for weight loss"
Tier 3 — Awareness Intent
The buyer is problem-aware but product-unaware. These terms generate impressions and little else for most PPC campaigns. Organic indexing here is valuable; paid spend here is usually a bleed. Most sellers over-invest in Tier 3.
Examples: "muscle recovery supplement", "bathroom accessories", "workout nutrition"
Building Your Keyword Map
Phase 1: Harvest
Your keyword map starts with a comprehensive harvest. Pull from five sources simultaneously:
- Helium 10 Cerebro — run your top 3 competitor ASINs to extract their organic and sponsored keyword footprint
- Amazon Brand Analytics (ABA) — Top Search Terms report shows actual Amazon search volume with click and conversion share data
- Search Term Report from Seller Central — your own historical performance, 90 days minimum
- Helium 10 Magnet — seed keyword expansion for adjacent and long-tail terms
- Reddit / social mining — how buyers describe the problem in their own language (often surfaces Tier 1 keywords invisible in tools)
You'll typically end up with 600–2,000 raw keywords. The next step is classification.
Phase 2: Classify by Intent Tier
Classification uses a simple decision tree. For each keyword, ask:
- Does it contain a specific product type, size, quantity, or format? → Tier 1
- Does it contain "best," "review," "vs," "for [persona]," or "top"? → Tier 2
- Is it a broad category term or problem description with no product specificity? → Tier 3
Phase 3: Assign Bid Strategy by Tier
Once classified, each tier gets a distinct campaign structure and bid logic:
| Tier | Match Type | Bid Strategy | Primary Goal | Budget Allocation |
|---|---|---|---|---|
| T1 — Purchase | Exact | Fixed bids, up to top of page | ROAS, revenue | 60–70% of total |
| T2 — Research | Phrase | Dynamic bids — down only | Rank + retargeting pool | 25–30% of total |
| T3 — Awareness | Broad / auto | Low fixed bids, harvest mode | Discovery + new T1 terms | 5–10% of total |
The logic: Tier 1 keywords are where revenue happens. Over-investing there is fine if the ROAS supports it. Tier 2 keywords are used in phrase match to maintain rank while harvesting converting search terms for promotion to T1 exact campaigns. Tier 3 is essentially a discovery layer — kept at minimal spend to surface new T1 candidates via auto campaigns and broad match.
The Negative Keyword Layer
A keyword map without a negative keyword architecture is like a funnel with holes. Your Tier 1 exact campaigns must be protected from Tier 2 and Tier 3 traffic bleeding in through broad/phrase match. This requires a rigorous negative keyword list maintained at both campaign and ad group level.
Negative keyword rule: Any search term that generated 5+ clicks and zero purchases over 60 days in a campaign is a negative keyword candidate. Review your Search Term Report weekly for the first 30 days after launch, then monthly once campaigns stabilize.
Cross-Campaign Negatives
If you're running T1, T2, and T3 campaigns in the same account, you need cross-campaign negatives to prevent overlap:
- Add all T1 exact keywords as exact negatives in T2 phrase campaigns (so T1 traffic routes to the right campaign)
- Add all T2 phrase keywords as phrase negatives in T3 broad/auto campaigns
- This creates a waterfall structure where traffic flows to the highest-intent campaign available for each search query
Keyword Map Maintenance Cadence
Your keyword map is not a one-time build. It has a maintenance cycle that matches the pace of Amazon's search behavior changes:
| Action | Frequency | What to Do |
|---|---|---|
| Search Term Report review | Weekly (first 30 days) | Harvest converting terms, add negative keywords |
| Bid adjustment review | Bi-weekly | Raise bids on T1 terms with ROAS > target; lower on underperformers |
| New keyword discovery | Monthly | Re-run Cerebro on top 3 competitors; check ABA for trending terms |
| Full keyword map audit | Quarterly | Reclassify terms, sunset low performers, promote T2→T1 graduates |
| Seasonal keyword prep | 6 weeks before peak | Add seasonal intent modifiers; pre-build campaigns for holiday terms |
The Organic Rank Dividend
The most underappreciated benefit of intent-mapped PPC is its effect on organic rank. A9 rewards sales velocity — and when your Tier 1 campaigns drive consistent conversions on high-intent keywords, Amazon's algorithm registers those as signals that your ASIN is the correct result for that search query. Over 90–120 days, this compresses your reliance on paid traffic for those terms.
TACOS decline as the signal: A healthy TACOS trajectory declines 1–2 percentage points per month as organic rank builds. If TACOS is flat or rising after 90 days of running an intent-mapped structure, the bottleneck is usually listing conversion rate — not keyword selection.
This is the compounding effect that separates brands who do this well from brands who merely run ads. The ads are a mechanism for building organic rank. Organic rank reduces ad dependency. Lower TACOS means higher margins. Higher margins mean more budget for strategic growth. The cycle compounds — but only if the keyword foundation is built on purchase intent from the start.
Frequently Asked Questions
How many Tier 1 keywords should I start with?
For a new or recently launched product, start with 15–25 exact-match Tier 1 keywords across 2–3 tightly themed ad groups. More keywords dilute your budget and slow the learning phase. As campaigns mature and you identify top performers, expand. Quality of keyword selection matters far more than volume at the start.
What's the difference between Amazon's keyword relevance score and actual purchase intent?
Amazon's relevance score determines whether A9 will display your ad for a given keyword — it's based on your listing content, category, and historical performance. Purchase intent is a buyer-side metric — it's about the likelihood that someone searching a specific term will purchase. A keyword can be highly relevant (you'll get impressions) but low-intent (the buyer is browsing, not buying). Both matter; they are not the same thing.
Should I run brand keywords in PPC if I already rank organically for them?
Yes, with discipline. Running your own brand keywords in an exact-match campaign prevents competitors from serving ads on your brand terms — which they will do if you leave the space empty. The ROAS on brand keyword campaigns is typically very high (buyers are already qualified). Keep bids moderate to avoid overpaying for traffic you'd have received organically anyway.
How do I know if a keyword has shifted from Tier 2 to Tier 1 status?
Promote a keyword from T2 to T1 when it meets all three criteria: (1) it appears in your Search Term Report with 15+ clicks, (2) its conversion rate is within 20% of your top T1 performers, and (3) it's shown consistent performance across at least 30 days. Move it to an exact-match T1 campaign and remove it as a phrase match from the T2 campaign to prevent budget overlap.