Smart Bidding ignores most manual bid adjustments by design. Strategies like Target CPA, Target ROAS, Maximize Conversions, and Maximize Conversion Value set bids in real time at auction, so device, location, ad schedule, and audience modifiers are overridden. The main exception is device bid adjustments of -100% for exclusions, which Smart Bidding still respects. If your modifiers aren't working, that's expected behavior, not a bug.

Why Smart Bidding Overrides Manual Bid Adjustments

Manual bid adjustments were built for Manual CPC and Enhanced CPC, where you control a base bid and apply percentage multipliers. Smart Bidding skips that whole layer. Google's machine learning evaluates signals at query time — device, time of day, location, browser, audience, and dozens more — and sets a unique bid for every auction.

Most teams get this wrong: they migrate a campaign to Target CPA and assume their carefully tuned device or schedule modifiers still apply. They don't. The algorithm has already priced those signals into each bid.

Which Adjustments Get Ignored

With Target CPA, Target ROAS, Maximize Conversions, and Maximize Conversion Value, these adjustments are ignored:

  • Device bid adjustments (except -100%)
  • Location bid adjustments
  • Ad schedule (dayparting) bid adjustments
  • Audience (remarketing/in-market) bid adjustments
  • Demographic bid adjustments

Which Adjustments Still Work

AdjustmentSmart Bidding behavior
Device -100%Honored (excludes device)
Location targeting (not bid mod)Honored
Audience targeting ("Targeting" setting)Honored
Seasonality adjustmentsHonored (separate tool)

The distinction matters: a device adjustment of -100% removes the device entirely, which is targeting, not bidding. Anything between -99% and +900% gets discarded.

Google Ads campaign settings panel showing device bid adjustment columns grayed out under a Target CPA strategy

Step-by-Step Troubleshooting

1. Confirm Your Bid Strategy

Open the campaign, go to Settings > Bidding. If it says Target CPA, Target ROAS, Maximize Conversions, or Maximize Conversion Value, manual adjustments won't apply. Only Manual CPC and Enhanced CPC respect the full range of modifiers — and Enhanced CPC was deprecated as a standalone option in 2024 for Search and Display.

2. Check the Adjustment Columns

In the Devices, Locations, or Ad schedule tab, look at the bid adjustment column. Under Smart Bidding, Google typically grays these out or shows a note that they won't take effect. If you can still enter a value but see no impact in reporting, the strategy is overriding it.

3. Verify You're Not on a Portfolio Strategy

Portfolio bid strategies apply across multiple campaigns. A campaign-level adjustment can conflict with portfolio settings. Check Tools > Shared library > Bid strategies to see what's controlling the campaign.

4. Use Seasonality Adjustments Instead

If you need to influence Smart Bidding around a known event — a sale, a product launch — use seasonality adjustments under Tools > Budgets and bidding > Seasonality adjustments. This tells the algorithm to expect a conversion rate change for a short window. It's the supported way to nudge bids, not the bid modifier column.

5. Apply Data Exclusions for Tracking Outages

If bids went haywire because of broken conversion tracking, use Data exclusions so Smart Bidding ignores that period instead of learning from bad data.

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How to Influence Smart Bidding the Right Way

Since you can't push percentage modifiers, you steer the algorithm through inputs:

  1. Set accurate conversion values. Smart Bidding optimizes toward the values you feed it. Bad values produce bad bids.
  2. Adjust your target. Lower your Target CPA or raise Target ROAS to change aggressiveness.
  3. Segment by campaign. Want different bids for mobile vs. desktop? Split into separate campaigns and set different targets. This is the cleanest replacement for device modifiers.
  4. Use audience targeting, not observation. Switch audiences to "Targeting" if you only want those users, instead of trying to bid up on them.
  5. Feed first-party data. Customer Match and enhanced conversions improve the signals driving each bid.

This input-driven approach mirrors how modern revenue teams build repeatable systems — the same logic behind structured sales discovery call prep, where you control inputs rather than micromanage outputs.

Device Targeting Workaround

text
Goal: bid 30% lower on mobile under Target CPA

Manual modifier approach: IGNORED

Working approach:
1. Duplicate campaign
2. Campaign A: target desktop + tablet only
3. Campaign B: target mobile only
4. Set Campaign B Target CPA 30% lower

Common Misconceptions

  • "My old modifiers are still saved, so they must work." They're stored but inert under Smart Bidding. If you switch back to Manual CPC, they reactivate.
  • "Maximize Clicks ignores adjustments too." Maximize Clicks is automated but does honor device, location, and schedule bid adjustments — it's not full Smart Bidding.
  • "Smart Bidding ignores audiences." It ignores audience bid adjustments, but it heavily uses audience signals in its own modeling.

Google documents this in its Smart Bidding help center, which lists exactly which signals the system optimizes automatically.

Diagram comparing manual bid adjustment workflow versus Smart Bidding signal-based auction-time bidding

Key Takeaways

  • Smart Bidding intentionally ignores manual bid adjustments — it's not a bug.
  • Only device -100% (exclusion) survives; all other modifiers are discarded.
  • Influence bids through targets, conversion values, campaign segmentation, and seasonality adjustments.
  • To replicate device or location modifiers, split into separate campaigns with different targets.
  • Manual CPC and Maximize Clicks still honor traditional bid adjustments; Target CPA/ROAS and Maximize Conversions/Conversion Value don't.