How to Cut Wasted Ad Spend With Negative Keyword Lists

These are not edge cases — they are the norm for any campaign without a robust negative keyword strategy. Industry benchmarks suggest that between 20% and 40% of PPC ad spend in poorly managed accounts goes to irrelevant search queries. For a business spending $5,000 per month on Google Ads, that is potentially $1,000 to $2,000 in entirely wasted budget every single month.

Negative keywords are the mechanism that prevents this waste. This guide explains exactly what negative keywords are, how to build them into an effective list, how to use the right match types, and how to implement a management routine that keeps your campaigns clean and efficient.

What Are Negative Keywords — And How Do They Work?

A negative keyword is a word or phrase that you add to your Google Ads campaign to prevent your ads from showing when a search query contains that term. When a user’s search includes a term on your negative keyword list, your ad is excluded from the auction for that query — saving your budget for searches that are genuinely relevant to your business.

Negative keywords work at three levels in your account: campaign level (applies to all ad groups in that campaign), ad group level (applies to that specific ad group only), and account level via shared negative keyword lists (applies to any campaign you attach the list to).

Negative Keyword Match Types — Understanding the Three Options

Just like positive keywords, negative keywords have three match types — and choosing the wrong one is one of the most common negative keyword mistakes. Each match type behaves differently in terms of how broadly or narrowly it blocks queries.

Match Type	Syntax	What It Blocks	Best Use Case	Risk
Broad match negative	free	Any query containing the word ‘free’ in any order or context	Blocking high-volume irrelevant single words (free, cheap, DIY, jobs)	Medium
Phrase match negative	“free SEO”	Any query containing the exact phrase ‘free SEO’ in that order	Blocking specific irrelevant phrases while allowing related terms	Low
Exact match negative	[free SEO audit]	Only queries that exactly match ‘free SEO audit’ with no other words	Blocking one very specific query while keeping all variations	Very Low

Which match type should you use most?

Phrase match negative is the most commonly recommended match type for the majority of negative keywords. It is specific enough to avoid accidentally blocking relevant queries, but broad enough to catch the full range of variations on an irrelevant phrase.

Broad match negative should be used for high-volume words that are categorically irrelevant — such as ‘free’, ‘cheap’, ‘DIY’, ‘jobs’, ‘salary’, ‘template’, ‘example’, and similar terms where any query containing that word is unlikely to be a potential customer. Exact match negative is best reserved for very specific problematic queries you need to block precisely.

The 8 Universal Categories of Negative Keywords Every Campaign Needs

Regardless of your industry or campaign type, these eight categories of negative keywords apply to almost every Google Ads account. Building lists across all eight categories before launching a campaign prevents the most common forms of wasted spend from day one.

Category	Example Terms	Why They Waste Budget
Job seekers	jobs, career, careers, hiring, vacancy, employment, internship, apprenticeship, work for, apply	People searching for employment, not services
Students & researchers	essay, assignment, dissertation, thesis, study, course, definition, what is, tutorial, how to learn	Academic research — no commercial intent
Free-seekers	free, freeware, open source, no cost, at no charge, gratis, complimentary, trial	Users unwilling to pay — never convert for paid services
DIY / self-serve	DIY, do it yourself, how to do, myself, template, guide, learn how, step by step, without an agency	Intent to do it themselves — not hire you
Competitors	[competitor brand names] — list all direct competitors operating in your market	Clicks that go to your ad but intend to visit a competitor site
Irrelevant industries	[unrelated industries sharing your keywords] — e.g. ‘marketing’ could attract food marketing, network marketing	Completely different industry intent
Price-sensitive	cheap, cheapest, budget, affordable, low cost, discount, bargain, economy	Price-driven searchers unlikely to convert for premium services
Information only	review, reviews, wiki, Wikipedia, history, meaning, definition, synonym, example, sample	Research queries with no buying intent

How to Build Your Negative Keyword Lists — A Step-by-Step Process

Building effective negative keyword lists is not a one-time task — it is a process that begins before launch and continues throughout the life of your campaigns. Here is the complete methodology.

Before spending a single dollar on Google Ads, build a foundational negative keyword list from first principles. This prevents obvious budget waste from day one and dramatically improves your campaign’s initial Quality Scores and CTR.

• Start with the eight universal categories above — build a list of 50–100 terms from these categories relevant to your business
• Think about every way your product or service keywords could be misinterpreted — what else could someone mean when they search for your keywords?
• Use Google’s Keyword Planner to see what queries are associated with your target keywords — identify and exclude irrelevant suggestions
• Review competitor websites and industry forums — what terms do people in your industry use that have nothing to do with buying services?
• Include all relevant competitor brand names as negatives unless you are specifically running competitor targeting campaigns
• Add common misspellings of irrelevant terms — if ‘free’ is a negative, ‘fre’ and ‘frea’ may also need to be excluded
• Add the list to a shared negative keyword list in your Google Ads account before launching any campaign

The Search Terms report is the single most valuable tool for discovering wasted ad spend. It shows the actual queries that triggered your ads and led to clicks — giving you a real-world view of what your keywords are actually matching. Mining this report systematically is the core habit of negative keyword management.

• Navigate to Google Ads > Keywords > Search Terms to access the report
• Filter the date range to the last 7–14 days — recent data is most actionable
• Sort by Cost (descending) to see which search terms are consuming the most budget
• Review every search term and classify it: relevant (leave it), irrelevant (add as negative), potentially relevant (investigate further)
• For irrelevant terms, select the query and use the ‘Add as negative keyword’ button — choose the appropriate level (ad group or campaign) and match type
• Look for patterns — if many irrelevant queries share a common word, add that word as a broad or phrase match negative
• Export the report to a spreadsheet monthly and review the cumulative list to identify systematic wastage patterns
• Set a weekly calendar reminder to review search terms — this is a non-negotiable campaign management task

Beyond the universal categories, every industry has specific terms that are systematically irrelevant for businesses advertising their services. Building industry-specific negative lists takes additional research time upfront but saves significant budget over the life of the campaign.

• For service businesses: add all terms related to doing-it-yourself, free tools, academic resources, and job searching in your field
• For B2B businesses: add consumer-oriented terms, lifestyle terms, and any B2C brand names that share your keywords
• For local businesses: add negatives for geographic areas you do not serve — suburbs, cities, or states outside your service area
• For premium or specialist services: add price-sensitive terms, mass-market brand names, and low-end alternatives
• Research industry forums and Q&A sites (Quora, Reddit) — what questions do people ask that you would never want to pay for?
• Review your own website analytics — what search terms in Google Analytics drive sessions with zero conversions? Add these as negatives
• Look at your CRM — what incorrect enquiries do you receive? The source of those mismatched leads often contains clues about missing negatives

Managing negative keywords separately for each campaign is inefficient and creates the risk of inconsistent coverage. Shared negative keyword lists allow you to build master lists once and apply them across multiple campaigns simultaneously — ensuring uniform coverage and making updates instantly effective across your entire account.

• Navigate to Google Ads > Shared Library > Negative Keyword Lists to create shared lists
• Create separate lists by category: Universal Negatives (applies to all campaigns), Job Seeker Negatives, Student Negatives, Competitor Negatives
• Apply each list to the relevant campaigns from the Shared Library interface
• When you add a new negative to a shared list, it automatically applies to all attached campaigns — no manual updates required
• Review shared lists quarterly to ensure they remain current and do not contain negatives that are blocking relevant traffic
• Create campaign-specific override lists for situations where a term is a negative at the account level but relevant for one specific campaign

Aggressive negative keyword strategies can go too far. Over-blocking — adding negatives that prevent relevant queries from triggering your ads — is a common and often undetected problem that suppresses campaign volume unnecessarily. Regular audits protect against this.

• Monitor campaign impression volume after adding new negative keywords — a sudden drop in impressions may indicate over-blocking
• Use the Search Terms report to check whether high-value query patterns have disappeared after adding negatives
• Review your negative keyword list periodically and challenge each term: is this still categorically irrelevant, or might it occasionally match valuable queries?
• Check for conflicts between your positive keywords and negative keywords — if a negative inadvertently blocks a positive keyword, your ad will never show for that term
• Use Google Ads Keyword Diagnosis tool to check whether specific keywords are being blocked by negative keywords
• When in doubt, add negatives at the ad group level rather than campaign level — this limits the scope of any over-blocking
• Track conversion rate and CTR changes alongside impression volume to identify whether removed impressions were valuable or not

Negative keyword management is not a set-and-forget activity. Search behaviour evolves, new irrelevant query patterns emerge, and seasonal changes introduce new sources of wasted spend. A monthly review routine keeps your lists current and your budget efficient.

• Weekly: review Search Terms report and add obvious irrelevant queries as negatives
• Monthly: export the full Search Terms report for the month, identify new wastage patterns, update shared lists
• Quarterly: audit your complete negative keyword lists — remove any that are no longer relevant, check for conflicts with positive keywords
• After any major campaign change (new keywords, new match types, new campaigns): immediately review Search Terms for new irrelevant patterns
• After seasonal peaks or events: review the Search Terms report for seasonal irrelevant queries that should be pre-emptively added before the next peak
• Document all changes with dates and rationale — this helps you track the budget impact of negative keyword improvements over time

Real-World Negative Keyword Examples by Business Type

Abstract principles only go so far. Here are concrete negative keyword examples for common business types to illustrate how category thinking translates into specific keyword lists.

Calculating Your Wasted Ad Spend — A Simple Diagnostic

Before investing time in negative keyword work, it helps to quantify the potential savings. This diagnostic framework gives you a realistic estimate of how much budget you may be wasting on irrelevant queries.

• 01Download your Search Terms reportExport all search terms from the last 90 days with their associated cost, clicks, and conversions.
• 02Classify each search termMark each term as: Relevant (R), Irrelevant (I), or Uncertain (U). Be conservative — only mark as Irrelevant terms you are certain would never convert.
• 03Sum the cost of irrelevant termsTotal the Cost column for all rows marked I. This is your confirmed wasted spend over 90 days. Multiply by four for an annualised estimate.
• 04Calculate the conversion opportunityDivide your wasted spend by your current average cost per conversion. This is the number of additional conversions you could have generated if that budget had gone to relevant clicks.

Common Negative Keyword Mistakes — And How to Avoid Them

Mistake	The Consequence & The Fix
Only reviewing search terms monthly	Significant wasted spend accumulates in one month. Review weekly — especially in the first 30 days of any new campaign when irrelevant traffic is highest.
Using only broad match negatives	Broad match negatives block too broadly and can suppress relevant queries. Use phrase match for most negatives; reserve broad match for truly universal irrelevant terms.
Adding campaign-level negatives inappropriately	Campaign-level negatives apply everywhere — including ad groups where the term might actually be relevant. Be specific about where each negative applies.
Not using shared lists across campaigns	Managing negatives separately in each campaign means inconsistent coverage and double the maintenance work. Use shared lists from day one.
Blocking competitor names across all campaigns	Blocking competitors as campaign-level negatives in all campaigns also blocks competitor conquest campaigns you might run intentionally. Segment carefully.
Never auditing existing negative lists	Negatives added a year ago may now block queries that have become relevant as your business or product range has evolved. Quarterly audits prevent obsolete blocking.
Confusing negatives with keyword exclusions	Negative keywords prevent ads from showing. They do not remove existing ads or affect your account’s keyword quality history. Understand the distinction.

Universal Starter Negative Keyword List — Ready to Use

Copy this list directly into your Google Ads shared negative keyword library as a starting point. Add industry-specific terms on top of this foundation. All terms should be added as phrase match negatives unless noted otherwise.

• Job seeker terms (broad match) — jobs, career, hiring, vacancy, internship, apprenticeship, employed, employment, recruit, recruitment
• Student / research terms (phrase match) — essay, assignment, dissertation, thesis, course, class, lecture, study guide, textbook, Wikipedia, definition, meaning, example, sample
• Free / low cost terms (broad match) — free, freeware, no cost, open source, gratis, complimentary
• DIY / self-serve terms (phrase match) — DIY, do it yourself, how to do myself, without an agency, on my own, step by step guide, learn how to
• Price-sensitive terms (broad match) — cheap, cheapest, budget, affordable, low cost, discount, bargain
• Information-only terms (phrase match) — review, reviews, history, meaning, synonym, what is, how does, explain, understanding, introduction to, overview of
• Competitor terms (exact match) — [add your direct competitors’ brand names here]

Negative Keyword Management Checklist

This article was written by the Innovsystems team. Innovsystems is a results-driven digital marketing agency specialising in SEO, PPC, social media, content, AI automation, and influencer marketing.