Target ROAS vs Profit Bidding: Which to Use

This post answers one question: which value should your bidding target? If you want to see what reported ROAS hides first, read how to calculate true ROAS. For the campaign structure that goes with profit bidding, see the profit-first account structure for ecommerce.

Why ROAS ignores margin

Return on ad spend divides revenue by cost. It’s simple and universal, and it ignores the number that decides whether your business survives: margin.

Two campaigns at 4.0 ROAS can have opposite outcomes. One sells accessories at a 65% margin and makes money on every order. The other sells discounted hardware at an 8% margin and loses cash once you count shipping and returns.

Google’s target ROAS bidding predicts the value of each conversion and bids to hit your target (Google Ads Help). It learns from the values you report. Send revenue and it optimizes revenue. Profit bidding sends gross profit as the conversion value instead.

What should the profit value include?

Send revenue minus:

• Cost of goods sold, at SKU level.
• Shipping cost, including any subsidy on free-shipping thresholds.
• Payment processing fees.
• Expected returns, applied per product category.
• Per-order packaging or fulfilment cost.

Leave out fixed overhead, salaries and the ad spend itself. You’re giving the algorithm contribution margin, not net profit.

Which tools calculate and send profit values?

In most ecommerce stacks, ProfitMetrics or a similar tool calculates the margin and forwards the adjusted value through server-side tracking to Google Ads, Meta and GA4. On a custom stack, you compute margin in the order confirmation payload and send it as the conversion value through Meta’s Conversions API and Google’s offline conversion imports.

Google also has native options. Conversions with cart data plus cost of goods sold in your Merchant Center feed gives you gross profit reporting in Google Ads. Conversion value rules let you adjust values by location, device or audience, and Smart Bidding uses them in real time.

Either way, you need accurate cost data per SKU, kept current. Getting those values into the platforms is the core of our conversion tracking work.

What happens when you switch to profit bidding?

Expect three things, in order.

Reported ROAS drops. If your average margin is 35%, a 4.0 revenue ROAS becomes about 1.4 on profit. The business hasn’t changed. The number now reflects margin.

Budget moves. Over the next few weeks, spend shifts toward high-margin products and away from the loss leaders that used to look like winners. Google advises waiting 1–2 conversion cycles for bidding to stabilize after a target change (Google Ads Help).

Volume dips, then profit rises. Order count often falls a little while contribution profit goes up.

Brief your stakeholders before the switch. A ROAS chart that falls by half with no context gets good strategies cancelled.

How to set the new target

Don’t convert your old target with a formula. Run Maximize conversion value with no target for two to three weeks, gather profit-based data, then set target ROAS near the level you achieved. Google recommends basing the target on your business goals with historical ROAS as the reference (Google Ads Help). Adjust in small steps after that.

A profit ROAS of 1.0 means you break even on contribution margin before overhead. Your required target depends on your fixed costs and how fast you want to grow, so work it out from your own P&L.

Our ecommerce PPC services cover the full setup, from margin data to targets.

When ROAS is still the right target

Stay on revenue-based values if:

• Your margins are close to identical across the catalog. Profit bidding would rescale the same decisions.
• You buy first orders below margin on purpose to win subscription or repeat revenue. Send predicted lifetime value instead.
• Your cost data is unreliable. Bad margin data does more damage than no margin data, because the algorithm acts on it with confidence.

Profit bidding for lead generation

For lead gen, the equivalent is sending different values for different lead stages through offline conversion imports. A booked demo is worth more than a newsletter signup, and a closed deal is worth more than both. Google now recommends enhanced conversions for leads as the starting point for importing those outcomes. Tell the algorithm what each outcome is worth, and it buys more of the valuable ones. See our Google Ads for lead generation setup.

Measure what you bank, not what you invoice. If you want help moving an account to profit bidding, see our Google Ads management.

FAQ

What is POAS?

POAS (profit on ad spend) is gross profit divided by ad spend. A POAS of 1.0 means the ads paid for themselves on contribution margin before overhead.

Does Google Ads support profit bidding natively?

Google doesn’t have a “profit” bid strategy. You bid with target ROAS or Maximize conversion value and send profit as the conversion value. Google can report gross profit if you send conversions with cart data and add cost of goods sold to Merchant Center (Google Ads Help).

How many conversions do you need for target ROAS?

For Search and Shopping campaigns, Google requires at least 15 conversions in the past 30 days (Google Ads Help). More volume gives the algorithm more to learn from.

Will profit bidding lower my revenue?

Often a little. Spend moves away from low-margin orders, so revenue and order count can dip while contribution profit rises.