Portfolio Bid Strategies in Google Ads: 2026 Guide
Maximize your Google Ads budget in 2026 with portfolio bid strategies. Step-by-step setup and optimization guide for better performance.
If you're using separate bid strategies for each campaign in your Google Ads account, a significant portion of your budget might be spent inefficiently. In 2026, Google's machine learning algorithms produce more consistent results with portfolio bid strategies. In this guide, I'll share how to set up a portfolio bid strategy, when to use it, and concrete thresholds for optimization.
What is Portfolio Bid Bidding?
Portfolio bid bidding allows you to combine multiple campaigns under a single bid strategy and optimize them toward a shared budget and goal. For example, you can group five different campaigns in the same product category into a single tCPA (target CPA) portfolio. Google's algorithm dynamically shifts budget among the campaigns within the portfolio to lower the total cost per conversion.
When to Use Portfolio Bid Strategy?
- Campaigns with similar target audience and conversion funnel: For example, different keyword groups for the same product.
- Campaigns with a shared budget constraint: If your total budget is limited, a portfolio ensures more efficient distribution.
- Campaigns with low conversion volume: You can accelerate the algorithm's learning by combining campaigns that can't gather enough data on their own.
Setting Up a Portfolio Bid Strategy: Step by Step
In the Google Ads interface, go to the "Bid strategies" section and create a "Portfolio bid strategy." Choose the strategy type: tCPA, tROAS, or Maximize Conversion Value. Then, select the campaigns to include in the portfolio. Key points to consider during setup:
- Conversion window: Use the same conversion window for all campaigns (e.g., 30 days).
- tCPA or tROAS target: Set a target 10% below your average CPA from the past 30 days. For example, if your average CPA is €100, set tCPA to €90.
- Budget allocation: Initially assign equal budgets to campaigns in the portfolio; the algorithm will optimize over time.
Example Calculation: Portfolio Optimization with tCPA
Suppose you have three campaigns: A, B, and C. Data from the past 30 days:
| Campaign | Spend (€) | Conversions | CPA (€) |
|---|---|---|---|
| A | 10,000 | 100 | 100 |
| B | 8,000 | 50 | 160 |
| C | 6,000 | 60 | 100 |
| Total | 24,000 | 210 | 114.3 |
Average CPA is €114.3. If you set the portfolio tCPA target to €105, the algorithm will allocate less budget to campaign B and shift toward A and C. Estimated new distribution: €12,000 to A, €4,000 to B, €8,000 to C. Total conversions: 120 + 25 + 80 = 225, new CPA: €24,000 / 225 = €106.7. This represents a 6.6% improvement.
Thresholds and Checklist for Optimization
After setting up your portfolio strategy, regularly monitor these metrics and intervention thresholds:
- Conversion volume: Each campaign in the portfolio should receive at least 10 conversions per week. If below, remove the campaign from the portfolio and try a separate strategy.
- CPA deviation: If there is a deviation of more than 20% from your target tCPA, revise the target or review the campaign structure.
- Budget constraint: If the portfolio's total budget is consistently exhausted, either increase the budget or pause low-performing campaigns.
- Learning period: After a strategy change, wait at least 2 weeks (or 50 conversions); early intervention can disrupt the algorithm.
Common Mistakes with Portfolio Bidding
The most common mistake is placing campaigns with different conversion funnels into the same portfolio. For example, combining a brand awareness campaign with a direct sales campaign leads the algorithm to optimize incorrectly. Additionally, if campaigns within the portfolio have different geo-targeting or device targeting, performance measurement becomes difficult. Therefore, when creating a portfolio, choose campaigns with similar targeting and conversion structures.
For a more comprehensive digital marketing strategy, you can explore our 360° Digital Marketing service. To professionally manage your ad management processes, check out our Ad Management page. Also, to strengthen your website's conversion infrastructure, you can benefit from our Web Design & Development services.
By correctly setting up portfolio bid strategies in your Google Ads account, you can get more efficiency from your budget. Plan a free discovery call now; let's analyze your existing campaigns together and create a customized roadmap for you.