The Google Ads API uses a minimum daily budget for Demand Gen campaigns
Google will begin implementing a minimum daily budget for Demand Gen campaigns starting April 1, 2026.
What happens: Google Ads API will require a minimum daily budget of $5 USD (or local equivalent) for all Demand Gen campaigns. This change is designed to help campaigns get past the “cold start” phase with enough money for Google’s models to learn and improve effectively. The update will roll out as an unmodified API change, applicable to all purchase methods.
Technical details:
- In API v21 and above, campaigns set below the threshold will trigger a
BUDGET_BELOW_DAILY_MINIMUMerror, with additional details available in the error metadata. - In API v20, advertisers will receive generics
UNKNOWNerror, with some validation failure referenced in the unpublished error code field.
The rule applies when adjusting budgets, start dates, or deadlines in ways that push daily spending below the $5 floor – including both daily and flying budgets.
Impact on existing campaigns. Current Demand Gen campaigns that are underperforming will continue to run. However, any future adjustments to budgets or planning will require compliance with the new baseline.
Why do we care. For marketers and developers, this adds a new layer of compliance to the campaign management flow. Systems will need to be updated to catch and handle the new validation errors before they are implemented.
An important point. Google measures the minimum investment threshold for Demand Gen – prioritizing performance stability, while requiring advertisers to adjust budgets and automation accordingly.
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