If your monthly budget is fixed, the budget is already doing the job of cost control. A CPA target on top of it is a second instruction, and since August 2026 Google follows that instruction far more literally.
For most B2B advertisers running Google Ads on a fixed monthly budget, Maximize Conversions with no target is the better bid strategy. Target CPA earns its place once the budget stops being the constraint, meaning you would happily spend more as long as each conversion lands at a known price. This guide is for marketing leaders at mid-market B2B companies deciding which one to run, and what number belongs in the target box if they set one at all.
Key takeaways
→ On a capped budget, Target CPA adds a second constraint. Set it too high and the campaign now spends its way up to it. Set it too low and it skips auctions and leaves budget unspent.
→ Google's August 17, 2026 bidding update changed how budget-limited Target CPA campaigns behave, and Google will not adjust your targets for you.
→ The number finance says you can afford per lead is the most dangerous number to type in as a target.
→ Move to Target CPA when you can defend a CPA from at least 30 days of real data and you are prepared to let the budget float.
What Target CPA and Maximize Conversions are each told to do
Maximize Conversions is told to spend the budget. Google says it sets bids "to help get the most conversions for your campaign while spending your budget," and its Maximize conversions help page describes the strategy as "limited by budget" by design. The budget is the instruction. Everything else is the system hunting for the cheapest conversions it can find inside that number.
Target CPA is told to hit an average price. Google's Target CPA documentation says the system will try to keep your cost per conversion equal to the target you set. The Maximize Conversions page draws the line clearly, saying target strategies aim for the average CPA "rather than spending your full budget to maximize conversions."
On a capped B2B budget, most teams quietly ask for both. Spend all of it, and also hit this price. I think of it like handing a contractor a fixed project price and an hourly rate at the same time. One of those numbers is going to lose, and you do not get to pick which.
A labeling change trips people up here. Starting in June 2026, Google began showing "Maximize conversions with a Target CPA" simply as "Target CPA." If someone ticked the optional target box during setup, that campaign is a Target CPA campaign now, whatever you remember choosing. Check the bid strategy column before assuming anything.
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Book your free auditWhat changed on August 17, 2026
Budget-limited Target CPA campaigns now deliver toward the target instead of beating it. Before the update, a campaign that was limited by budget could come in well under its target CPA, so the target behaved like a loose ceiling. Google's change notice says these campaigns now perform "more consistently toward your bid target," and gives its own example. A campaign with a $10 target that had been achieving $5 "now delivers more closely to a $10 actual CPA."
The FAQ on the change confirms the global rollout was completed on August 27, 2026. It also says campaigns that are not budget-constrained will not change their behavior, and that "Google does not automatically adjust your bidding targets or budgets."
That last line is the one B2B teams should care about. The pattern we see most often in inherited accounts is a generous target someone set once as a safety rail and never revisited, because it never seemed to bind. It binds now.
Target CPA vs Maximize Conversions on a capped budget, in numbers
Take an illustrative account with a fixed $12,000 monthly search budget. It has been getting demo requests at roughly $400 each, so about 30 a month. Someone set a $600 target CPA because that was the maximum the finance model said a demo was worth.
Before August, that target rarely mattered. The campaign was limited by budget and kept landing near $400.
After August, the system is told to deliver closer to $600, and the budget does not grow. If spend stays at the cap and the average CPA drifts toward the target, $12,000 at $600 buys about 20 demos instead of 30. That is a third fewer sales conversations for the same money, and nothing in the account looks broken. The CPA is right where the target says it should be.
The opposite mistake is just as quiet. Put a $300 target on that same account and Google's own documentation warns that a target that is too low "may cause you to forgo clicks that could result in conversions, resulting in fewer total conversions." In practice, the campaign stops entering the auctions it predicts will cost more, spend falls below the cap, and the leftover budget goes unspent. The dashboard shows a lovely CPA on a smaller pile of leads.
Neither outcome is what the team wanted. They wanted as many good demos as $12,000 could buy, which is exactly the Maximize Conversions instruction.
When Maximize Conversions is the right call
I default to Maximize Conversions on nearly every B2B search campaign where finance sets the budget at the start of the quarter and it will not move with performance. It fits when:
→ The monthly budget is fixed, and you would spend all of it at today's cost per lead without complaint.
→ The bidding event is a qualified action you trust. If it is still a raw form fill, fix that first, because our post on feeding Smart Bidding pipeline instead of form fills explains why the event matters more than the strategy.
→ The campaign gets fewer than about 30 conversions a month on that event. Google recommends judging a target over the last 30 days "including at least 30 conversions," and it will not even calculate a recommended target for a campaign with fewer than 7.
→ Nobody can say where a CPA number would come from other than a spreadsheet.
Two operating notes for anyone running it. Google's bidding docs say to be comfortable with a campaign spending up to 2 times its average daily budget on a given day while staying within the monthly limit, so an expensive Tuesday is normal and not a fault.
Also, do not judge a Maximize Conversions campaign by the Search lost IS (budget) column. Google says that column is incompatible with the strategy, because a campaign designed to spend its whole budget always looks budget-limited, and it points you to the budget simulator instead. Lost impression share is still a fair read on other strategies, as our guide to annual paid media budget planning uses it, but on this one use the simulator.
When Target CPA earns its place
Target CPA is a scaling tool for a budget that can float, not a cost-control tool for a budget that cannot. Google's FAQ describes the intended setup as demand-led budgeting, where you set a daily budget higher than you expect to spend, enter an accurate target, and accept that the budget will not always be spent in full. The change notice gives the same advice for scaling, which is to keep "a daily budget that is comfortably higher than your average daily spend."
That describes a specific kind of company. It knows what a qualified conversion from paid search is worth, it has agreed internally to fund every conversion under that price, and the CFO is fine with monthly spend moving around. Plenty of mid-market B2B teams are not there yet. It only means the budget is the real control, and the bid strategy should say so.
There is one legitimate reason to run a tight target on a capped budget. You would rather buy fewer, cheaper leads and hand money back than spend the full amount. That is a real business decision, so make it on purpose, write it down, and warn sales that volume will fall. Google is direct about the cost, saying that with a more efficient target "your daily spend will likely be impacted."
Where the target number should come from
Set the target from what the campaign actually achieves, not from what the business can afford. Google's recommended target is the average CPA over the last 30 days, adjusted for conversion delays. That is a sensible starting point because it tells the system to keep doing what it already does while you watch.
The affordability number from finance is a ceiling for the business. As a bidding input it is the worst number available, since after August the system treats it as a price to pay rather than a line not to cross.
There is usually a second problem with that figure. Most B2B CPA targets are built from a blended customer value across every channel. Customers acquired through paid search can be worth more or less than that blend, and until lifetime value is split by channel nobody knows which. A strict target built on the blended figure can cap growth without improving the economics at all.
If you want bidding to reflect real deal value, that is a separate project with its own volume requirements, and our post on when value-based bidding makes sense in B2B covers it.
How to switch bid strategies without breaking the account
The process I use is the same whichever direction the switch goes.
1. Pull the last 30 days for the campaign: actual CPA, conversions on the bidding event, spend against budget, and whether the status shows Limited by budget.
2. If it runs Target CPA and is limited by budget, compare actual CPA with the Avg. target CPA column rather than the number you typed. Google says the average target is what Smart Bidding actually optimized toward, because device adjustments and past target changes move it.
3. Decide which constraint is real. A fixed budget points to Maximize Conversions. A floating budget plus a CPA you can defend points to Target CPA set at the trailing actual.
4. Use Save as experiment instead of Save when you change the setting, so you get a clean comparison rather than a before-and-after argument.
5. Give it time. Google's learning period guidance says a bid strategy typically needs 1 to 2 conversion cycles to calibrate to a new objective, and the target-change FAQ gives the same 1 to 2 cycle window before judging results. On a 45-day sales cycle, a one-week verdict is noise.
6. Judge the result on qualified pipeline from the campaign, not on CPA alone. A lower CPA on fewer demos is not a win.
FAQ
Does Maximize Conversions overspend the budget?
It can spend up to twice the average daily budget on an individual day, but Google keeps total spend within the monthly charging limit. Over a month it lands on the budget you set.
Can I run Target CPA with very few conversions?
Google allows Target CPA with no conversion history at all. It will not recommend a target below 7 conversions, and it suggests evaluating over periods with at least 30. Below that, the target is mostly a guess dressed up as a setting.
The ten-minute audit to run this week
Open Campaigns, filter to anything Limited by budget, and add the bid strategy, Avg. target CPA and actual CPA columns. Any Target CPA campaign whose target sits well above its actual CPA is a campaign that quietly got more expensive in late August. Either lower the target to the trailing 30-day actual or switch it to Maximize Conversions and let the budget do the cost control.
If you want a second set of eyes on which of your campaigns moved after the change, that review is part of how we run every B2B Google Ads account we take on.
