Bidding strategy is one of the few settings in Google Ads where being wrong doesn't just underperform, it actively destroys the account's ability to learn and improve. The wrong keywords waste money on irrelevant clicks, but the algorithm can still learn from the data and get better over time. The wrong bidding strategy prevents learning from happening at all, because the algorithm either doesn't have enough data to calibrate (too aggressive too early) or it's optimizing toward the wrong objective (chasing clicks when you need conversions, or chasing conversions when you need profitable conversions).
We audit bidding strategy as step 8 in our 12-point Google Ads audit because it requires understanding the account’s conversion volume, conversion tracking accuracy, and campaign structure before you can evaluate whether the bidding approach is appropriate. A bidding strategy that’s perfect for an account generating 80 conversions per month would be catastrophic for one generating 8, and you can’t know which situation you’re in without the data from earlier audit steps.
The Volume Ladder
Google’s Smart Bidding algorithms need conversion data to learn what works. The more conversions an account generates, the more sophisticated and aggressive the bidding strategy can be. Trying to skip rungs on this ladder is the most common bidding mistake we find on audits, and it usually happens because someone read that Target CPA is the "best" strategy without understanding that it requires a specific conversion volume to function.
At fewer than 15 conversions per month, Smart Bidding can’t fully exit its learning phase. The algorithm needs roughly 50 conversion events to calibrate to a new objective, and at 15 per month it takes over three months just to finish initial calibration, during which time performance is volatile and unpredictable. For accounts at this volume, Max Clicks with a CPC cap is the appropriate starting strategy. It builds traffic volume, generates the conversion data you’ll need later, and the CPC cap prevents runaway spend. It’s not glamorous, but it works at low volume because it doesn’t require conversion data to function.
At 30 or more conversions per month, Maximize Conversions becomes viable. This is Google’s published minimum threshold for conversion-based Smart Bidding. The algorithm has enough data to learn which auctions are more likely to produce conversions and can bid accordingly. The risk at this stage is that Maximize Conversions will spend your entire daily budget every day regardless of efficiency, because its only objective is "get as many conversions as possible within this budget." It doesn’t care what each conversion costs, only that it’s getting them.
At 50 or more conversions per month, Target CPA becomes the right move for most lead generation accounts. At this volume, the algorithm has enough signal to optimize not just for conversion volume but for conversion cost. You tell it "I want leads at $X each" and it adjusts bids to hit that target across different auctions, devices, times of day, and audiences. The key requirement is that you need to know what your actual CPA is before you set a target, which means running on Maximize Conversions long enough to establish a baseline, then transitioning to Target CPA at or slightly above that baseline.
For ecommerce accounts with conversion values tracked (purchase revenue, not just purchase count), Target ROAS is the eventual destination, but it requires even more data than Target CPA because it’s optimizing for value, not just events. Google’s practical floor for Target ROAS is 50+ conversions per month with consistent value data, and even then it takes longer to stabilize because the algorithm is solving a more complex problem.
What Happens When You Pick Wrong
The most common mistake we see is accounts launched directly on Target CPA with no historical conversion data. Someone sets up a new campaign, picks Target CPA at $50 because that’s what they want to pay, and turns it on. The algorithm has zero historical data to work with, no understanding of which auctions convert, no baseline for what CPCs are needed to achieve that target, and no conversion patterns to learn from. It either underspends dramatically (showing in very few auctions because it can’t confidently predict which ones will convert at the target) or overspends on the wrong traffic while it experiments its way toward understanding the account.
We took over a legal services account where someone had launched three campaigns simultaneously on Target CPA at $75. The account had been running for six weeks and had generated 4 total conversions across all three campaigns because the algorithm kept entering and exiting learning status without ever getting enough data to stabilize. The daily budgets were barely being spent because the algorithm couldn’t find auctions it was confident would produce conversions at $75, so it just didn’t bid on most of them. Six weeks of near-zero lead volume because the bidding strategy was too advanced for the account’s data maturity.
The fix was straightforward: switched all three campaigns to Max Clicks with CPC caps for 60 days, generated enough traffic to accumulate conversion data, then transitioned to Maximize Conversions once we had 30+ conversions per month and clean tracking. The CPA during the Max Clicks phase was higher than the eventual target because we weren’t optimizing for it yet, but at least leads were coming in. Within 90 days the account was generating consistent volume at a CPA the firm found profitable, and we transitioned to Target CPA with a realistic target based on what the data actually showed rather than what someone wished it would cost.
Brand Campaigns Are the Exception
Every rule above applies to non-brand campaigns, meaning campaigns targeting service keywords, product keywords, competitor keywords, or any search where the person doesn’t already know your business name. Brand campaigns are a completely different situation and need a completely different bidding approach, but we regularly find them running on Maximize Conversions or Target CPA alongside everything else in the account.
Brand traffic converts at 25-40% click-to-lead because the person already knows who you are and is coming back to take action. CPCs are typically $1-3 because you’re often the only advertiser bidding on your own name (unless competitors are targeting it). Smart Bidding sees this high conversion rate and low CPC and thinks "this is amazing, I should bid aggressively here," which is unnecessary because you’d win those auctions at minimum bids anyway. You’re paying Smart Bidding’s premium on traffic you would have gotten for $0.50/click.
The correct strategy for brand campaigns is Target Impression Share set to 90-95%, which tells Google "show my ad for as many brand searches as possible without trying to optimize for conversions." This captures your branded demand at the lowest possible cost while ensuring competitors can’t steal your traffic by default. We covered this in detail in our brand impression share post, including what happens when brand campaigns run on the wrong strategy (the 29% impression share example where competitors captured 71% of branded searches).
The other acceptable option for brand is Manual CPC set at a low fixed bid ($1-2 depending on market). Either approach works because the goal for brand isn’t "optimize for conversions at a target cost," it’s "be present for every search of your own name without overpaying." Smart Bidding adds unnecessary complexity and cost to something that should be simple.
The Learning Period and How People Accidentally Reset It
When you switch bidding strategies or make significant changes to a campaign’s structure, Google enters a "Learning" phase where the algorithm recalibrates to the new conditions. During this period, performance is volatile, CPAs fluctuate, and Google is essentially experimenting with different bid levels to understand how the new setup performs. The formal learning status typically lasts 7-14 days, though true stabilization often takes 3-4 weeks.
The practical rule practitioners use is the 20% threshold: don't change your Target CPA, Target ROAS, or campaign budget by more than 20% within a single week. Changes larger than 20% trigger a learning reset. This applies cumulatively, so three 8% changes in one week still crosses the threshold even though each individual change seems small. If you need to change a Target CPA from $100 to $60, do it in steps ($100 → $80 → $65 → $60) over 3-4 weeks rather than all at once.
Other actions that trigger learning resets include adding or removing significant numbers of keywords (more than roughly 20% of the keyword list), adding or removing ad groups, changing conversion actions, and switching between bid strategies entirely. This matters for account rebuilds because restructuring campaigns while they’re on Smart Bidding sends every affected campaign back into learning simultaneously. We sequence our rebuilds to minimize learning disruption, but some unavoidable learning time is the cost of making structural improvements.
eCPC Is Dead and What That Means
Enhanced CPC was deprecated in March 2025 and campaigns that were running it got auto-converted to Manual CPC. It’s been gone for over a year now, but it’s still relevant because a lot of the accounts we take over were originally built during the eCPC era and never got transitioned to a proper Smart Bidding strategy after the conversion happened. They’re sitting on Manual CPC by default, not because someone chose it, but because Google removed what they were using and nobody went back to set up something better.
This matters because eCPC was the comfortable middle ground that a lot of agencies used for years. It let you set manual bids but gave Google permission to adjust them up or down based on conversion likelihood, without committing to full Smart Bidding. Losing it forces a binary choice: either you’re on Manual CPC with full control and no algorithmic assistance, or you’re on one of the Smart Bidding strategies where Google controls the bids entirely and you set the objective.
For low-volume accounts that used eCPC as a compromise, the current best option is Max Clicks with a CPC cap. It provides a similar feel (you’re setting a ceiling on what you’ll pay per click) while giving Google some flexibility in how it distributes bids within that ceiling. It’s not identical to eCPC, but it fills the same role in the volume ladder for accounts that aren’t ready for conversion-based bidding.
How to Check Yours
Go to your Google Ads account and look at the bidding strategy on each campaign. You’ll see it in the campaign settings or in the "Bid strategy type" column if you’ve added it to your campaign view. For each campaign, ask yourself two questions: does this campaign have enough conversion volume to support the strategy it’s running, and is the strategy appropriate for the type of traffic the campaign captures.
If a non-brand campaign is running Target CPA with fewer than 30 conversions per month, it’s likely struggling to exit learning and would perform better on Maximize Conversions or even Max Clicks with a CPC cap until volume builds. If a brand campaign is running Maximize Conversions or Target CPA, it’s overcomplicating something simple and probably overpaying for clicks it would have won at minimum bid.
Check whether any campaigns show "Learning" or "Learning (limited)" in the bid strategy status column. If a campaign has been in learning for more than 3 weeks, something is keeping it from stabilizing, usually insufficient conversion volume for the strategy selected or repeated changes that keep resetting the calibration period. That campaign needs either a simpler strategy or fewer changes while it learns.
If your agency can’t explain why each campaign is on its current bidding strategy, or if the answer is "we use Target CPA on everything" regardless of conversion volume, that’s a one-size-fits-all approach being applied to situations that need different solutions.
The right bidding strategy is determined by data maturity, not by what sounds most advanced.
This is one of the 12 steps in our full Google Ads audit process. If you want us to evaluate whether your bidding strategies match your conversion volume and show you where changes would improve performance, request a free audit and we’ll run the analysis.
