- Primary conversion actions count in the “Conversions” column and steer Smart Bidding. Secondary actions appear only in “All conversions” and don't steer bids.
- Where to check: Google Ads → Goals → Conversions → Summary. The “Action optimization” column shows Primary or Secondary for each action.
- Common mistake: an imported “job completed” or “won” action set to secondary while “clicked phone number”, page views or chat opens are primary.
- Real account: completed jobs from the shop's software were partly secondary. Google optimized for leads, and cost per job varied 24× between campaigns.
- Changing which actions are primary restarts bid-strategy learning. Do it deliberately, once, with checkpoints.
Every conversion action in Google Ads is either primary or secondary. It's a one-click setting most people never look at, and it decides whether your bidding is chasing customers or chasing something that merely looks like them. This guide explains the setting, shows how to check it in two minutes, and how to change it without wrecking a bid strategy that's working.
What the two settings do
Primary conversion actions are counted in the “Conversions” column and used by Smart Bidding (Maximize conversions, Target CPA, Target ROAS). When Google decides how much to bid on a search, it's predicting the probability of a primary conversion.
Secondary conversion actions are observed, not optimized. They show up in the “All conversions” column and in reports, but they don't affect bids and don't appear in the default “Conversions” column.
Within a goal (for example “Submit lead form” or “Purchase”), Google counts primary actions toward that goal; you can have several primary actions across goals. The practical point is simpler: whatever is primary is what the account is for, as far as the algorithm is concerned.
Why it matters
If “clicked phone number” and “page view” are primary and “job completed” is secondary, Google will find you more people who tap phone numbers and view pages. It will do this efficiently. It will report a falling cost per conversion. And none of that has anything to do with how many customers you got.
Google is very good at getting more of whatever you ask for. The primary/secondary setting is how you ask.
This is also why cost per lead and cost per job drift apart (see that guide): the bidding is pulling the account toward cheap leads, and cheap leads are not evenly distributed across your campaigns.
The two-minute check
- In Google Ads, open Goals in the left menu, then Conversions → Summary.
- Set the date range to the last 90 days and look at every row. The Action optimization column says Primary or Secondary.
- For each primary action, ask: would I pay money for one of these on its own? A booked appointment, yes. A tap on a phone number, no.
- For each secondary action, ask: is this the thing I actually sell? If “job completed”, “won” or “invoice paid” is here, you've found the problem.
- Note the count on each action. A primary action with hundreds of conversions that nobody can explain is steering your bids right now.
What a good setup looks like
- Primary = things you'd pay for. Qualified form submissions, calls over a minimum duration, booked appointments. One or two per goal, not six.
- Jobs imported, with values. Booked or completed jobs sent back to Google Ads through your CRM, shop software or an offline conversion import, each with its revenue. Primary once there's enough volume (see the first question below), secondary with values until then.
- Everything else secondary. Page views, button clicks, chat opens, directions. Useful to see; harmful to optimize for.
- No duplicates. The same phone call shouldn't count as “call from ad” and “call from website” and “clicked phone number”. Three primaries for one event triples its weight.
How to change it safely
Switching an action between primary and secondary changes what the bid strategy is optimizing for, and the strategy will re-learn. Expect a few bumpy weeks. To keep it to a few:
- Write down the baseline first. Cost per lead, cost per job and conversion volume per campaign for the last 90 days.
- Make one change. Don't move budgets or add negatives the same week.
- Check volume. If the new primary action has fewer than about 15 conversions a month per campaign, consider keeping leads primary and importing jobs with values instead of flipping.
- Checkpoints. Week 1: is the action still recording? Week 3: lead volume and cost per lead in the affected campaigns. Day 90: cost per job against the baseline.
A real example
An auto film shop in Minneapolis (names changed) had its shop software reporting completed jobs back to Google Ads, which is more than most accounts manage. But those job actions were partly set as secondary, while form and call actions were primary. Google was optimizing for leads. Over 90 days the account's cost per lead ranged from $4 to $26 across campaigns; cost per paid job ranged from $20 to $483. The campaign that got a third of the budget had the most expensive jobs by far, and from the algorithm's point of view it was doing fine, because its leads were cheap enough.
A separate pop-up form action had 255 primary conversions in the window and wasn't on the owner's list of lead sources. Whether that form represents real inquiries is a question for the owner; what's certain is that it was steering bids. Our deep audit lists every action like this with its count and setting, so the question gets asked.
Questions people ask
Should I make paid jobs my only primary conversion right away?
Usually not right away. Smart Bidding needs volume to learn; Google's own guidance has long pointed to around 15 conversions a month per campaign for Target CPA, and more is better. If you close 10 jobs a month from ads, making jobs the only primary action starves the algorithm. A common middle path: keep qualified leads primary, import jobs as secondary with values for reporting, and switch when job volume supports it.
Does setting an action to secondary lose the data?
No. Secondary actions are still recorded and still appear in the “All conversions” column and in reports. They just don't influence bidding and don't appear in the default “Conversions” column.
Why does Google report a conversion when nobody became a customer?
Because a conversion is whatever action you (or whoever set up the account) told Google to count. If “clicked the phone number” is a primary action, every tap counts, including misdials and existing customers. The fix is in the conversion settings, not in the campaigns.
What about offline conversion import and enhanced conversions for leads?
Both are ways to get real outcomes (booked, paid) into Google Ads. Enhanced conversions for leads match on hashed email or phone; offline conversion import matches on the Google click ID. Either way the action still has to be set as primary to steer bidding.