Your bidding strategy is the single instruction you give Google that controls how it spends your budget in every auction. Get it right and the algorithm works in your favour, finding converting users at efficient costs. Get it wrong and you can burn significant budget before realising the issue - because the wrong bidding strategy can look like it is working on the surface while quietly misallocating spend underneath.
This guide covers every bidding strategy available in Google Ads in 2026 - what each one does, exactly when to use it, and what happens when you use it at the wrong stage. Whether you are setting up your first campaign or trying to understand why a mature account is underperforming, you will leave with a clear decision framework for choosing and switching strategies at the right time.
How Google Ads Bidding Actually Works
Every time someone searches on Google, an auction happens in milliseconds. Google looks at all the advertisers competing for that query and assigns each one an Ad Rank score. Ad Rank determines whether your ad shows, in what position, and what you actually pay per click. Your bid is one input into Ad Rank. Quality Score - a measure of ad relevance, expected click-through rate, and landing page experience - is the other major input. This means a higher bid does not automatically win the auction. An advertiser with a lower max bid but a higher Quality Score can outrank and out-compete you while paying less per click.
Your bidding strategy tells Google how to set bids across all your keywords automatically. Manual CPC means you set the bid yourself. Every Smart Bidding strategy means Google's AI sets the bid for each individual auction based on signals including the user's device, location, time of day, search query context, browsing history, and hundreds of other real-time factors. The difference in sophistication between manual bidding and Smart Bidding is enormous - but Smart Bidding's advantage only materialises once the algorithm has enough conversion data to model what a converting user looks like for your specific account.
Google deprecated Enhanced CPC for Search and Display campaigns in March 2025. If your account was running ECPC and was not manually migrated, it is now effectively running Manual CPC. Check your campaign settings and confirm which strategy is actually active. Any account still showing ECPC in the interface is a legacy display - the underlying bidding has changed.
Manual CPC: Full Control, No Automation
Manual CPC is exactly what it sounds like. You set a maximum cost per click for each keyword, and Google will not bid above that amount in any auction. The algorithm does not adjust bids based on conversion probability, user context, or auction signals. What you set is what Google uses.
You control every bid at the keyword level. Google makes no automatic adjustments for conversion probability, device, location, or user context. Appropriate only for very specific situations where data is insufficient or control is the overriding priority.
When to Use
- Brand-new campaign with zero conversion history
- Very small accounts below $500/month spend with fewer than 10 monthly conversions
- Branded exact match keywords where you want absolute position control
- Testing phase before any conversion data exists in the account
When to Avoid
- Any campaign generating 30+ monthly conversions
- Accounts with clean conversion tracking and stable performance history
- Campaigns where efficiency improvement is the goal
- Any situation where Smart Bidding data requirements are met
The honest position in 2026: Manual CPC is a starting point, not a destination. It is appropriate for the period before conversion data exists. Once your campaign generates 30 or more monthly conversions with clean conversion tracking, staying on Manual CPC is actively leaving performance improvement unused. Smart Bidding's ability to process auction-time signals at scale cannot be replicated by manual bid management, regardless of how frequently you review and adjust.
Maximise Clicks: Drive Traffic Volume, Not Conversions
Maximise Clicks tells Google to get as many clicks as possible within your daily budget, with no consideration for conversion probability. The algorithm optimises purely for click volume and will find the cheapest clicks available - which are not always the highest-intent clicks.
Google sets bids to maximise total click volume within your budget. No conversion intent signal is considered. Clicks from low-intent users count equally to high-intent users. Can be effective in very specific situations but should not be the default for conversion-focused campaigns.
When to Use
- Pure awareness campaigns where traffic volume matters more than conversion efficiency
- New sites needing initial traffic data to inform future optimisation
- Display campaigns targeting broad interest audiences for brand exposure
- Budget testing to understand CPC ranges before conversion tracking is live
When to Avoid
- Any campaign where lead generation or sales is the goal
- Accounts with conversion tracking in place - Maximise Conversions is always better
- High-CPC competitive keywords where cheap clicks often signal low intent
- Performance Max campaigns - Max Clicks is not available and not appropriate
A common mistake for new advertisers: switching to Maximise Clicks when a campaign is not generating enough conversions, in the hope that more traffic will produce more leads. More traffic from Maximise Clicks is not better traffic. It is cheaper traffic, which typically means lower intent. If your campaign is not converting, the problem is almost never click volume. It is keyword intent, landing page quality, or conversion tracking. Fix those first.
Target Impression Share: For Visibility, Not Conversions
Target Impression Share is the only bidding strategy in Google Ads that optimises purely for ad position and visibility rather than conversions or clicks. You tell Google where you want your ad to appear - anywhere on the page, at the top of page results, or in the absolute top position - and what percentage of eligible auctions you want to appear there. Google then adjusts bids to achieve that share of voice target.
Sets bids to achieve a target percentage of impressions in a specific position. Not conversion-focused and will overpay for clicks when necessary to hit the impression share target. Appropriate for branded visibility and competitive defence campaigns.
When to Use
- Branded keyword campaigns where you want to dominate your own brand SERP
- Competitive defence when a competitor is bidding on your brand terms
- Awareness-led campaigns in competitive markets where visibility is the KPI
- Local businesses where top-of-page presence is critical for call volume
When to Avoid
- Any non-brand campaign where conversion volume is the primary goal
- Accounts with limited budgets - TIS will overspend on impressions at the cost of conversions
- Lead generation campaigns for B2B, professional services, or ecommerce
- Campaigns already using Smart Bidding strategies for conversion goals
If individual campaigns lack enough conversion volume to qualify for Target CPA or Target ROAS on their own, consider a Portfolio Bid Strategy. Portfolio strategies pool conversion data from multiple campaigns under one shared target. An account where three campaigns each generate 12 monthly conversions individually - not enough for Target CPA alone - can pool all 36 conversions under one portfolio target and unlock Smart Bidding earlier. Set up portfolio strategies under Tools, then Bid Strategies. Avoid pooling campaigns with fundamentally different economics under the same target.
Maximise Conversions and Target CPA: The Lead Generation Pair
Maximise Conversions and Target CPA are best understood as two phases of the same strategy. Maximise Conversions is the data collection phase - it tells Google to get as many conversions as possible within your daily budget, with no efficiency constraint. Target CPA is the optimisation phase - it tells Google to get as many conversions as possible at or below a specific cost per acquisition target. You move from the first to the second once sufficient conversion history exists.
In Google Ads' current interface, Target CPA is actually a setting within Maximise Conversions rather than a separate strategy - you enable Maximise Conversions and optionally add a Target CPA constraint. Without the target, the algorithm prioritises volume. With the target, it prioritises efficiency at that cost level.
Google spends your full daily budget to get as many conversions as possible. No efficiency floor is set. The algorithm explores broadly to find converting users. Ideal for new campaigns building conversion history before constraints are introduced.
When to Use
- New campaigns with fewer than 30 conversions in the last 30 days
- Campaigns coming out of a bidding strategy change needing re-learning
- Accounts where conversion volume is the primary goal and CPA is flexible
- Any lead generation campaign before historical CPA benchmarks exist
When to Avoid
- Campaigns with very tight CPA requirements that cannot flex during learning
- Mature campaigns with strong historical CPA data - Target CPA will outperform
- Campaigns where budget is limited and overspend is a risk without a CPA floor
Google targets a specific average cost per conversion. Some conversions will cost more than the target and some less, but the algorithm aims to average at or below your CPA goal. Maximises conversion volume within that efficiency constraint. Best for lead generation businesses where all conversions have roughly equal value.
When to Use
- Lead generation campaigns with 30+ monthly conversions and a known target CPA
- B2B and service businesses where all leads have roughly the same value
- Accounts that have run Maximise Conversions and now have historical CPA data to base a target on
- Real estate, legal, and professional services campaigns with offline conversion paths
When to Avoid
- Campaigns below 30 monthly conversions - algorithm will under-bid and miss volume
- Ecommerce with highly variable order values - Target ROAS is more appropriate
- Accounts where conversion tracking accuracy has not been verified - bad data produces wrong CPA targets
Never set an arbitrary Target CPA based on what you wish you were paying. Run Maximise Conversions without a target for 4 to 6 weeks first. Export your actual average CPA from that period. Set your initial Target CPA at that historical average or 10 to 15 percent above it. The algorithm needs a achievable target to work toward. If you set a target 40 percent below your historical average on day one, the campaign will under-bid on virtually every auction and deliver almost no volume.
Maximise Conversion Value and Target ROAS: The Ecommerce Pair
Maximise Conversion Value and Target ROAS are the revenue-optimised equivalents of the conversion volume pair. Instead of optimising toward the number of conversions, they optimise toward the total revenue value of conversions. This distinction matters enormously for ecommerce businesses where a $20 order and a $500 order both count as one conversion under Target CPA, but are worth very different amounts under Target ROAS.
Maximise Conversion Value tells Google to spend your full budget generating as much conversion value as possible. Target ROAS adds an efficiency constraint - generate at least a specific ratio of revenue for every dollar spent. As with the conversion volume pair, you start with Maximise Conversion Value to collect data, then add a ROAS target once you have consistent conversion value history to base it on.
Google spends your full budget to maximise total revenue from conversions. Unlike Maximise Conversions which treats all conversions equally, this strategy prioritises higher-value conversions. Requires accurate revenue values passed in conversion tracking.
When to Use
- New ecommerce campaigns before consistent ROAS history exists
- Accounts transitioning from Target CPA to ROAS optimisation
- Businesses where conversion values vary significantly (different product price points)
- Any account where revenue tracking is clean and passes accurate order values
When to Avoid
- Accounts where revenue values are not tracked - without values, this behaves like Max Conversions
- Lead generation businesses where all conversions are form fills with no attached value
- Accounts where conversion value tracking accuracy has not been verified
Google targets a specific return on ad spend. Set 400% and Google tries to generate $4 in revenue for every $1 spent. The algorithm adjusts bids up for high-value, high-intent queries and down for lower-value queries. Requires the highest data volume of any bidding strategy.
When to Use
- Ecommerce with 50 to 100+ monthly conversions and consistent revenue tracking
- Campaigns with variable order values where revenue optimisation outperforms conversion count
- Mature accounts where a known target ROAS aligns with your break-even margin calculation
- Shopping campaigns and Performance Max with product feed and purchase tracking
When to Avoid
- Accounts below 50 monthly conversions - insufficient data for reliable ROAS modelling
- Lead generation without offline conversion values imported - treats all leads as equal value
- Setting targets above achievable ranges based on historical data - causes severe under-spending
For a deep dive on what a good Target ROAS actually looks like for your specific margin and industry, see the Google Ads ROAS benchmarks guide which includes the break-even ROAS formula and 2026 benchmarks across 11 industries.
The Campaign Lifecycle Framework: Which Strategy at Which Stage
The biggest mistake most advertisers make with bidding is choosing a strategy based on where they want to be rather than where they actually are. Smart Bidding strategies are not aspirational targets - they are data-dependent tools that only work correctly when the account has the conversion volume to support them. This framework maps the correct strategy to each stage of campaign maturity.
Use Manual CPC or Maximise Conversions (no target). Priority is data collection, not efficiency. Accept that CPA will be unpredictable. Do not add Target CPA or Target ROAS at this stage - the algorithm will under-bid without sufficient data. Ensure conversion tracking is live and measuring a genuine business event before the campaign goes live.
Switch to Target CPA (for lead gen) or Target ROAS (for ecommerce). Set the initial target at or slightly above your current historical average CPA or ROAS - not at an aspirational target. Allow 4 weeks for the algorithm to stabilise before evaluating performance. Do not make other major changes (budget, match types, ad copy, landing pages) during the learning phase.
Tighten Target CPA or Target ROAS gradually - reduce by 10 to 15 percent every two to three weeks and monitor volume. At this stage, consider Portfolio Bid Strategies if you have multiple campaigns in the same vertical. Pooling conversion data across campaigns can unlock tighter targets sooner by giving the algorithm a larger dataset to model from.
If you are running Performance Max campaigns, the bidding strategy within PMax should align with your overall account strategy. PMax uses Maximise Conversion Value or Target ROAS by default for ecommerce, and Maximise Conversions or Target CPA for lead gen. Critically, PMax's bidding interacts with your Search campaigns - always check for brand cannibalization and channel budget distribution. See the full PMax diagnostic guide for the checks that matter.
Lead generation (B2B, services, real estate, legal): Maximise Conversions (no target) to build data, then Target CPA once 30+ monthly conversions reached. Ecommerce with variable order values: Maximise Conversion Value (no target) to build data, then Target ROAS with 50+ monthly conversions. Ecommerce with fixed product price: Target CPA is acceptable because all conversions have the same value. Brand awareness and visibility: Target Impression Share for branded terms only. New campaigns, any type: Manual CPC or Maximise Conversions (no target) until conversion data exists.
The 5 Biggest Bidding Mistakes and How to Avoid Each One
Most bidding problems come from a small set of consistently repeated mistakes. These five account for the majority of wasted budget and underperformance across the accounts I audit. Checking for all five is part of the standard Google Ads account audit process.
- Setting Target CPA or Target ROAS before sufficient conversion data exists The algorithm needs 30 or more monthly conversions to model reliably. Setting a Target CPA on a campaign with 8 monthly conversions will cause it to under-bid on most auctions, producing almost no volume while appearing efficient on a per-conversion basis. Run Maximise Conversions first. Build data. Then add the target when the history exists to support it
- Setting an aspirational target rather than a historical one Your current average CPA is $150 and you set Target CPA at $60 because that is what the business needs it to be. The algorithm will under-bid on virtually every auction, find only a handful of extremely cheap conversions, and miss most of the volume available. Set targets at or near historical averages first. Then reduce gradually - 10 to 15 percent every two to three weeks - until you find the efficiency and volume balance your business can sustain
- Making multiple changes simultaneously during the learning phase Every significant change to a campaign - new bidding strategy, budget change, keyword addition, match type change, landing page swap - restarts or extends the Smart Bidding learning phase. Making three changes in the same week means the algorithm never stabilises. Allow 4 weeks of stability after any bidding strategy change before evaluating performance or making further adjustments. This is the single most violated rule in Smart Bidding management
- Using Smart Bidding on broken or inaccurate conversion tracking Smart Bidding optimises toward whatever conversion actions you have defined as primary. If your primary conversion is a page view, button click, or duplicate tag firing twice for every real lead, the algorithm will optimise toward finding as many page views or button clicks as your budget allows - not buyers or qualified leads. Always verify conversion tracking accuracy before enabling any Smart Bidding strategy. See the full tracking audit in the account audit guide
- Accepting auto-applied bidding strategy changes from Google's recommendations Google's auto-applied recommendations frequently include bidding strategy changes - upgrading from Manual CPC to Maximise Conversions, or from Target CPA to Target ROAS - that may not be appropriate for your current data volume or business situation. Check your Auto-apply settings under Tools, then Account Settings, then Automation. Disable auto-apply for bid strategy changes. Every bidding strategy change should be a deliberate decision made when your data supports it, not an automated change made by Google's recommendation engine
Frequently Asked Questions
