Shared budgets let multiple campaigns draw from a single daily pool.
Used correctly, they improve budget efficiency. Used incorrectly, they suppress your best campaigns.
How Shared Budgets Work
Individual campaign budgets: Each campaign has a fixed daily cap.
If Campaign A hits $100/day at noon, it stops until midnight.
Shared budget: Google dynamically allocates from the pool based on performance signals.
If Campaign A is converting strongly at 2pm, it can draw more than its "fair share."
If Campaign B is quiet, it uses less. Total budget efficiency improves.
When to Use Shared Budgets
Best for:
- Campaigns with similar audiences and conversion values
- Geographic variants of the same campaign (city A, city B, city C)
- Seasonal campaigns where one campaign is more active than others at a given time
When NOT to Use Shared Budgets
Brand + non-brand together: Brand keywords have 5-10x higher CVR.
Smart Bidding will route most of the shared budget to brand campaigns.
Non-brand campaigns get suppressed. You think non-brand is "not working" — actually starved.
Different conversion value campaigns: A $5K service and a $200 product
should not compete for the same budget pool.
Monitoring a Shared Budget
After 2 weeks: Check campaign-level spend distribution.
Red flag: One campaign consuming 70%+ of the shared budget.
That campaign likely needs its own larger individual budget instead.
Shared budgets and Google Ads budget allocation strategy: yositeup.com
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