Broad Match and Smart Bidding: Making Them Work

For years, broad match was the match type most paid search managers avoided. It was unpredictable, expensive, and notorious for triggering irrelevant queries that drained budgets overnight. If you ran Google Ads in 2015, you probably learned the hard way that broad match for "running shoes" could show your ad to someone searching for "how to run away from home."

That reputation stuck. But the match type itself has changed dramatically, and so has the bidding infrastructure around it. Since 2022, exact match has lost nearly 10 percentage points of spend share, and broad match is now the dominant match type by budget across Google Ads. That shift did not happen by accident. It happened because Google’s Smart Bidding algorithms have reached a level of sophistication where broad match is no longer a gamble; it is a strategy.

The catch? Broad match still requires guardrails. Without Smart Bidding and disciplined negative keyword management, it can still waste money. This article explains how to pair broad match with Smart Bidding effectively, what safeguards to put in place, and when broad match is (and is not) the right choice. If you are looking for hands-on support with your paid search strategy, our paid search agency team works with brands across Australia to get this right.

How Broad Match Has Evolved

Broad match in 2026 is not the same product it was five years ago. Google has progressively layered machine learning signals into how broad match interprets queries. Rather than simply matching on synonyms or loosely related words, broad match now considers the user’s recent search history, the content of the landing page, other keywords in the ad group, and geographic and device context.

This means broad match has moved from keyword expansion to intent matching. When you bid on the broad match keyword "accounting software," Google is not just finding variations of those words. It is finding users whose behaviour signals they are actively researching accounting solutions, even if their specific query is something like "best way to manage small business finances."

The data supports the shift. 62% of advertisers using Smart Bidding now use broad match as their primary match type, and brands implementing modern broad match strategies report 67% more traffic, 34% lower costs, and 45% better efficiency compared to restrictive match type approaches.

That said, these results are not automatic. They depend entirely on how broad match is configured and what systems surround it.

Why Smart Bidding Changes Everything

The reason broad match works now, when it did not work reliably before, comes down to one thing: Smart Bidding sets a bid for each individual auction, bidding up or down based on expected performance. This is fundamentally different from manual or rules-based bidding, where every query matched by a broad keyword gets roughly the same bid.

With manual bidding, a broad match keyword like "digital marketing" might trigger your ad for "digital marketing salary" or "digital marketing free course." You would pay the same click cost regardless of whether the query was commercial or informational. That is where the waste came from.

Smart Bidding changes the equation. Strategies like Target CPA, Target ROAS, and Maximise Conversions evaluate each auction individually. If the algorithm determines a query is unlikely to convert, it bids low or does not bid at all. If it determines a query has high conversion potential, it bids aggressively. Broad match provides the reach; Smart Bidding provides the precision.

The performance impact is measurable. Changing phrase match keywords to broad match within Target CPA campaigns can deliver approximately 25% more conversions, while Target ROAS campaigns can see around 12% more conversion value. These are not marginal gains. They represent a meaningful shift in how campaigns discover and convert new audiences.

The Two Conditions for Success

Broad match delivers results when two conditions are met simultaneously. Remove either one, and performance degrades quickly.

• Condition 1: Active Smart Bidding. Broad match should only be used with automated bid strategies. Target CPA, Target ROAS, or Maximise Conversions (with a target) are the three strategies that pair well with broad match. If you are using manual CPC or Enhanced CPC, broad match will almost certainly waste budget because there is no auction-level bid adjustment to filter out low-quality traffic.
• Condition 2: Active negative keyword management. Smart Bidding is good, but it is not perfect. It relies on conversion data, and there will always be query categories that are irrelevant regardless of what the algorithm predicts. Terms like "free," "jobs," "salary," "reddit," and "cheap" are common examples. Without a structured negative keyword strategy, these queries will consume budget before the algorithm learns to avoid them.

When both conditions are in place, broad match becomes a powerful tool for finding conversion opportunities that exact and phrase match would never surface. When either condition is missing, broad match reverts to the unpredictable spend driver it was years ago.

Setting Up Broad Match the Right Way

Transitioning to broad match is not as simple as changing match types and walking away. A structured approach reduces risk and gives Smart Bidding the best possible foundation to work from.

Consolidate Your Campaign Structure

Best practice in 2026 is to consolidate into 3 to 10 tightly themed ad groups per campaign. This is a significant shift from the old model of dozens of ad groups with single-keyword or close-variant groupings. The reason is simple: Smart Bidding needs data volume to optimise effectively. Spreading conversions across 50 ad groups gives the algorithm very little signal to work with in each one.

Group keywords by intent theme, not by individual keyword variation. For example, an ad group for "accounting software" might include broad match keywords like "accounting software," "bookkeeping platform," and "small business accounting." These all serve the same intent, and the algorithm will learn which queries convert across the full set.

Start with Your Highest-Value Campaigns

Do not convert everything to broad match at once. Begin with campaigns that already have strong conversion data and reliable Smart Bidding performance. These campaigns give the algorithm the best historical signal to work from when evaluating new query types.

Run broad match alongside your existing exact and phrase match keywords for at least two to four weeks before making decisions. This lets you compare performance directly and identify any query categories that need to be added to your negative keyword lists.

Ensure Conversion Tracking Is Accurate

This is non-negotiable. Smart Bidding optimises toward conversions, so if your conversion tracking is inaccurate, incomplete, or counting low-value actions, the algorithm will optimise toward the wrong outcomes. Before expanding to broad match, audit your conversion actions. Make sure you are tracking the actions that actually matter to your business, and that attribution settings are configured correctly.

If you are unsure whether your tracking is set up correctly, it is worth getting an expert review before making match type changes. Our team at Marketing Systems regularly audits conversion tracking as a first step before any campaign restructure.

Negative Keyword Strategy: Your Most Important Guardrail

If Smart Bidding is the engine that makes broad match work, negative keywords are the steering wheel. Without them, you are relying entirely on the algorithm to distinguish commercial intent from informational, career-related, or freebie-seeking queries. The algorithm is good at this, but it is not infallible, especially in the first few weeks of a broad match rollout.

The most effective approach is to build layered negative keyword lists that operate at different levels of the account.

Account-Level Negative Keyword Lists

Use Account-Level Negative Keyword Lists to block entire themes that are universally irrelevant to your business. Common examples include:

• "free" and "cheap" for brands that do not compete on price
• "jobs," "careers," "salary" to block employment-related queries
• "reddit," "quora," "forum" to avoid research-stage traffic that rarely converts
• "how to," "tutorial," "DIY" if you are targeting buyers rather than learners
• Competitor brand names if you do not want to bid on competitor terms

These lists should be reviewed and updated monthly. As broad match discovers new query patterns, new negative keyword themes will emerge.

Campaign-Level and Ad Group-Level Negatives

Beyond account-level lists, add campaign-specific negatives to prevent overlap between campaigns. If you have separate campaigns for different product lines, use negatives to ensure queries are routed to the correct campaign. This prevents internal competition and ensures budget is allocated to the most relevant landing pages.

At the ad group level, use negatives sparingly and only to resolve clear conflicts between ad groups within the same campaign. Over-engineering ad group negatives in a consolidated structure creates more problems than it solves.

When to Use Broad Match vs Exact Match vs Phrase Match

• Broad match is best for discovery and scale. Use it when you have Smart Bidding active, sufficient conversion data (at least 30 conversions per month in the campaign), and a mature negative keyword strategy. It excels at finding new audiences and query patterns you would not have thought to target.
• Phrase match is useful for campaigns where you need moderate reach with tighter query control. It works well for newer campaigns that are still building conversion history, or for high-value keywords where you want to limit the range of queries that trigger your ads.
• Exact match still has a place for your highest-value, most competitive terms. Brand keywords, high-intent commercial queries with proven conversion rates, and terms where you need absolute control over which queries trigger your ads are all good candidates for exact match.

A practical approach is to use broad match for 60 to 70% of your keyword portfolio, phrase match for 20 to 30%, and exact match for your top 10 to 15 performers. Adjust these ratios based on your risk tolerance and how much conversion data your account generates.

Monitoring and Optimisation

Broad match requires more active monitoring than exact match. The expanded query range means you need a consistent review process to catch issues early and feed learnings back into your negative keyword strategy.

Weekly Search Terms Review

Review search terms at least weekly during the first month of a broad match rollout, then fortnightly once performance stabilises. Focus on three things: queries that converted (to understand what the algorithm is finding), queries with high spend but no conversions (candidates for negatives), and entirely irrelevant query categories (candidates for account-level negatives).

High-performing advertisers are moving from geographic segmentation to intent layering as their primary optimisation lens. This means grouping and analysing queries by purchase intent stage rather than just location, which gives a clearer picture of where broad match is adding value and where it is generating noise.

Performance Benchmarks to Watch

Track these metrics closely when transitioning to broad match:

• Cost per conversion should remain within 10 to 15% of your target during the learning period. If it spikes beyond that, check your search terms report for new irrelevant query categories.
• Conversion rate will typically dip slightly as broad match introduces new query types. A 10 to 20% dip is normal initially; if it drops further, tighten your negatives.
• Impression share may increase significantly. This is expected, but watch for impression share gains that do not translate into proportional conversion gains.
• Search term relevance ratio tracks what percentage of your matched queries are genuinely relevant. Aim for 70% or higher relevance in your search terms report.

Common Mistakes to Avoid

• Switching to broad match without Smart Bidding. This is the single most common mistake. Broad match with manual bidding will almost always result in wasted spend.
• Not building negative keyword lists before launch. Proactive negatives based on your industry knowledge will save budget in the critical first weeks.
• Converting all keywords at once. A phased rollout lets you identify issues early without putting your entire account at risk.
• Ignoring search terms after the first month. Broad match continuously discovers new queries. Monthly negative keyword reviews should be a permanent part of your workflow.
• Over-segmenting ad groups. Consolidation is essential for giving Smart Bidding enough data. Resist the urge to create granular ad group structures that worked with manual bidding.

Making Broad Match Work for Your Business

Broad match paired with Smart Bidding is one of the most significant shifts in paid search strategy over the past five years. The data is clear: when implemented with proper guardrails, it delivers more traffic, more conversions, and lower costs. But the guardrails matter just as much as the strategy itself.

The advertisers seeing the best results are those who treat broad match as a system, not a setting. That system includes Smart Bidding with clear targets, layered negative keyword lists, consolidated campaign structures, accurate conversion tracking, and consistent monitoring. Miss any one of those components and performance will suffer.

If you are considering a shift to broad match or want to improve the performance of campaigns already using it, get in touch with our team. We help Australian businesses build paid search strategies that balance reach with control, and we are happy to start with a no-obligation review of your current account structure.