Target ROAS bidding in Microsoft Advertising
Target ROAS bidding optimizes auction bids to maximize total conversion value and revenue. Here is how to configure, calibrate, and scale value-based bidding.
How Target ROAS algorithms evaluate value#
Target ROAS evaluates both the likelihood of a conversion and the anticipated transaction value. If search signals indicate a high-basket order, the algorithm raises the bid aggressively to secure the placement.
As explained in Microsoft Value-Based Bidding Help, 2026, target ROAS is entered as a percentage (e.g., 400% represents £4.00 of revenue for every £1.00 spent).
Mandatory conversion value data infrastructure#
Target ROAS cannot function with simple conversion counts. Websites must pass dynamic basket values via UET custom events or transaction variables as specified in Microsoft UET Revenue Tracking Guide, 2026.
Verify that currency codes in your UET revenue tags match your Microsoft Advertising account billing currency.
Calibrating and adjusting ROAS targets#
Set initial targets equal to actual 30-day trailing ROAS. Raising the ROAS target causes the algorithm to bid more conservatively, reducing total revenue while increasing margin percentage.
Lowering the target allows the algorithm to bid more aggressively on competitive high-volume queries, increasing gross revenue at slightly lower margins.
Enhancing Target ROAS with conversion value rules#
Layering Conversion Value Rules allows advertisers to adjust transaction values based on audience segments (e.g., +20% for existing customer lists) or geographic markets, refining algorithm prioritization.
Explore our Microsoft Ads Hub for value rule configuration templates.
Target ROAS calibration guidelines#
The table below provides strategic calibration benchmarks based on business growth objectives.
| Strategic Objective | Target ROAS Setting | Expected Account Impact |
|---|---|---|
| Aggressive Market Share Growth | Historical ROAS minus 20% | Higher impression volume and top-line revenue |
| Balanced Revenue & Margin | Equal to Historical ROAS | Stable volume with predictable profitability |
| Strict Margin Maximisation | Historical ROAS plus 25% | Lower impression volume with peak efficiency |
| Inventory Liquidation | Historical ROAS minus 40% | Maximum conversion velocity on clearance stock |
Frequently asked questions#
What happens if I set my Target ROAS too high?
Setting Target ROAS too high restricts bid competitiveness, causing campaign impressions, clicks, and total revenue to decrease sharply.
How many conversions are needed to use Target ROAS?
Microsoft recommends at least 50 conversion events with recorded revenue values over a 30-day period for optimal Target ROAS stability.
How do I calculate my break-even ROAS?
Break-even ROAS is calculated as (1 divided by Profit Margin Percentage) multiplied by 100. For example, a 25% margin yields a 400% break-even ROAS.
Can Target ROAS be used for lead generation?
Yes, if lead stages (MQL, SQL, Opportunity) are assigned static or dynamic values in UET or uploaded via offline conversions.
How quickly should I expect results after changing a ROAS target?
Allow 7 to 14 days for the bidding algorithm to adjust to new ROAS targets before evaluating performance trends.
Read more on this topic#
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