GA4 Cross-Channel Budgeting is a beta feature that lets you forecast performance and optimize budget allocation across all your ad platforms inside Google Analytics. Requirements: 1 year of conversion data, campaign data from 2+ channels, and imported cost data from Meta, TikTok, Pinterest, Snap, or Reddit. Use Projection Plans to answer "are we on pace?" and Scenario Plans to test "what if we shift 20% to TikTok?"
What Cross-Channel Budgeting Actually Does
On January 16, 2026, Google released Cross-Channel Budgeting to GA4. This isn't just another report—it's the first time Google Analytics can actively help you plan and optimize media spend across platforms you don't control.
The feature has two main tools: Projection Plans that forecast how your channels will perform against KPIs (spend, conversions, revenue), and Scenario Plans that let you test different budget allocations and see predicted ROI before committing spend.
Requirements to Enable It
Cross-Channel Budgeting isn't available to everyone yet. Your property needs:
- 1 year of conversion data — Key events are not compatible; must be actual conversions
- Campaign data from 2+ channels — At least one Google and one non-Google channel
- Linked Google Ads account — For Google campaign data
- Imported cost data — From Meta, TikTok, Pinterest, Snap, and/or Reddit
After setup, Google evaluates your models—this takes up to 2 days. If cost imports are incomplete or conversions are messy, your forecasts will be unreliable.
"GA4 is rewarding teams that import cost data from multiple ad platforms and keep conversions clean. If GA4 cannot see spend, or if conversions are messy, your forecasts will be junk."— Whistler Billboards
How to Set It Up
Step 1: Link Google Ads — Go to Admin > Product links > Google Ads linking. If you use DV360 or SA360, link those too.
Step 2: Import non-Google data — GA4 now supports native integrations for Meta, TikTok, Snap, Pinterest, and Reddit. Go to Admin > Data collection and modification > Data import. Select the platform, authenticate, and GA4 imports cost, clicks, and impressions automatically.
Step 3: Verify your conversions — Only mark true business outcomes as conversions (purchases, form fills). Keep everything else as events. This keeps your forecasts focused.
Step 4: Wait for model evaluation — After setup, Google evaluates model quality for up to 2 days. Check Admin > Property > Cross-channel budgeting status for eligibility details.
Using Projection Plans
Projection Plans answer pacing questions: Is spend on track? What conversions or revenue can we expect based on planned spend? Access them at Advertising > Budgeting.
The system shows your most efficient and least efficient channels with recommendations. If TikTok is overperforming at lower CPAs, you'll see that. If Display is burning budget with no conversions, that shows too.
Using Scenario Plans
Scenario Plans let you test budget allocation hypotheses before spending money. Want to know what happens if you shift 20% of Google Ads budget to Meta? Run a scenario.
The system analyzes predicted ROI at different budget levels and shows optimal allocations. This previously required expensive third-party tools like Robyn or manual spreadsheet modeling.
Limitations to Know
This is still beta. Desktop-only access. Properties with low conversion volume may see unreliable forecasts. If you're not hitting 400+ conversions per action within the lookback window, GA4 may fall back to simpler models without telling you.