> Quick answer: Go to TikTok Ads Manager, create an ad group, scroll to Bidding & Optimization, and configure attribution type and duration. Publish. You cannot change it afterward.
Setting an attribution window tells TikTok Ads Manager how long to count a conversion after someone interacts with your ad. Get it wrong and your cost-per-acquisition data looks broken. Get it right and you can accurately compare creative performance across every campaign.
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What Is an Attribution Window in TikTok Ads?
Per TikTok for Business, an attribution window is the number of days between when a person viewed or clicked an ad and then took action, within which TikTok Ads Manager reports that conversion.
Definition and impact on conversion reporting
The window is the credit period. If a user clicks your ad on Monday and buys on Friday, a 7-day click-through window counts that sale. A 1-day window does not. Choose too short and conversions vanish from your reports. Choose too long and TikTok takes credit for sales driven by other channels.
Three attribution types: Click-through, Engaged View-through, and View-through
TikTok offers three types:
- Click-through Attribution (CTA): User clicks your ad, then converts.
- Engaged View-through Attribution (EVTA): User watches 6 or more seconds of your video without clicking, then converts.
- View-through Attribution (VTA): User sees the ad but does not interact, then converts.
Why attribution window choice matters for ROI measurement
A shorter window shows fewer conversions but less noise. A longer window captures delayed decisions but may inflate TikTok's credit. Match the window to your typical customer decision cycle.
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Step-by-Step: How to Set Attribution Window in TikTok Ads Manager
You configure attribution once, during ad group creation. You cannot edit it after.
Access the Campaign and Ad Group creation flow
- Log in to TikTok Ads Manager.
- Click Create and select your campaign objective.
- Click Continue to open ad group setup.
Navigate to Bidding and Optimization and attribution settings
- Scroll to the Bidding & Optimization section.
- Set your optimization goal (for example, conversions).
- The Attribution panel appears directly below the optimization goal selector.
Select attribution type and window duration
- Choose your attribution type: CTA, EVTA, or VTA.
- Select the window duration for each type you enable.
- Set the Event Count (Every or Once) if prompted for purchase events.
Save and publish the ad group
- Review all settings carefully.
- Click Publish. Attribution is now locked for this ad group.
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Attribution Window Options Explained
Per TikTok's Business Help Center, each attribution type has distinct duration options.
Click-through Attribution (CTA): 1, 7, 14, or 28 days
CTA tracks users who clicked your ad. Available windows: 1, 7, 14, or 28 days. Most advertisers start with 7 days. Use 28 days for high-consideration purchases like software or premium goods.
Engaged View-through Attribution (EVTA): 1 or 7 days
EVTA qualifies only when a user watches at least 6 seconds of your video without clicking. Available windows: 1 or 7 days. This captures conversion credit from strong video content that earns attention but not an immediate tap.
View-through Attribution (VTA): Off, 1, or 7 days
VTA credits conversions from users who saw the ad without any interaction. Available settings: Off, 1 day, or 7 days. Many advertisers start with VTA off to keep reported conversions conservative.
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Critical Constraint: Attribution Settings Cannot Be Changed
This is the single most important fact to know before you hit publish.
Why TikTok locks in attribution post-publication
TikTok Ads Manager locks attribution settings once an ad group goes live. Changing windows mid-flight would corrupt the conversion data for that ad group. The lock keeps historical reporting consistent.
How to create a new ad group if you need a different window
You cannot edit the live ad group. Instead, duplicate it, update the attribution settings before publishing the copy, then pause the original. All future conversions track under the new window.
Planning implications for campaign setup
Decide on attribution strategy before launch. Write the chosen windows into your campaign brief. Changing later costs you a fresh learning period and resets delivery optimization on all associated ads.
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Best Practices for Choosing Your Attribution Window
Align TikTok Ads Manager window with your MMP settings
If you use a Mobile Measurement Partner like AppsFlyer or Adjust, match your TikTok window to your MMP window. Misaligned settings create reporting discrepancies that are hard to trace.
Use Performance Comparison to test different windows
TikTok's Performance Comparison feature lets you compare conversions across attribution window options. Use it to evaluate which window best matches your target cost per acquisition before committing to a campaign structure.
Consider your conversion funnel timing and customer journey
Impulse purchases convert fast. A 1 or 7-day CTA window is usually enough. Complex or considered purchases may need 14 or 28 days. Check your historical sales cycle data first.
Monitor cost per acquisition across different windows
Watch CPA shift as you compare window options. A 28-day window reports lower CPA than a 1-day window for the same spend, because it claims more conversions. Know exactly what you're comparing before drawing conclusions.
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Using Coinis to Optimize Ads for Faster Conversions
Attribution windows only matter if your creative drives action. Better creative means more conversions captured within any window you pick.
Build high-intent creative to capture conversions within your chosen window
Coinis Image Ads and UGC Style workflows generate scroll-stopping creatives from your product URL. Cutting-edge AI models handle layout, copy, and format. You launch with more variations to test and stronger signals to act on.
Test ad variations to improve conversion velocity
The Revise Variate feature spins multiple versions of a winning creative in one click. More variation means faster signals on what drives conversions. When Coinis Advertise Reporting expands to TikTok, you will see cross-platform performance alongside your Meta campaigns in one unified view.
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Frequently Asked Questions
Can I change my attribution window after an ad group is published on TikTok?
No. TikTok locks attribution settings the moment an ad group goes live. To use a different window, duplicate the ad group, update the attribution settings before publishing the copy, and pause the original.
What attribution window should I start with for a new TikTok campaign?
Most advertisers start with 7-day Click-through Attribution. It balances conversion credit with reasonable accuracy. Add View-through Attribution cautiously, since it can inflate reported conversions by crediting passive impressions.
What is Engaged View-through Attribution (EVTA) on TikTok?
EVTA credits a conversion when a user watched at least 6 seconds of your video ad without clicking, then converted within 1 or 7 days. It captures impact from high-attention video content that drives delayed action rather than immediate clicks.
Why do my TikTok Ads Manager conversion numbers differ from my MMP data?
Attribution window mismatches are the most common cause. If your MMP uses a 7-day click window and TikTok Ads Manager is set to 28 days, the platforms count different conversion pools. Align both settings to minimize the gap.