Value-Based Bidding

Value-Based Bidding (VBB) is a form of Smart Bidding where the algorithm optimises not for conversion volume but for the value those conversions deliver to the business. Advertisers define "value" — revenue, profit margin, lead score, or likelihood of repeat purchase — and Google's auction-time model uses this to bias spend toward higher-value outcomes. It is the natural complement to Break-Even ROAS and POAS (Profit on Ad Spend) thinking: VBB is the mechanism that executes the value definition at bid time.

The two strategies

VBB covers two bidding strategies inside Smart Bidding (Google renamed these in June 2026 — cosmetic only):

• Maximize Conversion Value (unconstrained): spend the daily budget to capture as much total conversion value as possible; best when budget is consistently fully spent.
• Target ROAS (efficiency-constrained): achieve a specific return on ad spend target while maximising value; best when budgets are uncapped and efficiency matters.

Per Google Ads Help Center (support.google.com/google-ads/answer/15099424, undated), Maximize Conversion Value without a target ROAS is best for campaigns that consistently spend their daily budget; Target ROAS is best with uncapped budgets (as-of undated/current).

How it works

At auction time, Google's algorithm uses signals — device, location, time of day, query, and audience membership — to predict which auctions are most likely to produce higher-value outcomes, then adjusts the bid accordingly. The advertiser's role is to report accurate conversion values so the algorithm optimises toward real business economics rather than raw conversion counts. ^[1]

Advertisers can further refine using Conversion Value Rules, which adjust values at auction time based on three conditions Google Ads currently supports: location, audience membership, and device; a maximum of two condition types can be combined on a single rule (as-of 2026-07-16).

Value rules earn their keep for signals only the advertiser knows — profit margin by product line, a CRM-derived lifetime value estimate, or the fact that leads from one audience close at a meaningfully different rate — since these are not observable from click data alone. (Optmyzr, 2026-07-16)

Setup requirements

Per the Google Ads Help Center (undated, current) and Optmyzr (2026-07-16):

• At least 15 conversions in the last 30 days (Google official minimum for Target ROAS on Search/Display); 30–50 conversions is the practitioner-recommended reliability threshold before trusting the algorithm's judgment (as-of 2026-07-16).
• 2+ unique conversion values must be reported — advertisers cannot use a single flat conversion value and activate VBB.
• Conversion delays shorter than 7 days are recommended; longer delays extend the ramp-up period (potentially to several months).
• Pre-load value data for 4 weeks or 3 conversion cycles (whichever is longer) before switching; avoid backfilling historical value data when migrating.
• Eligible channels as of 2026: Search, Shopping, Performance Max (PMax), Demand Gen, Display.

Ecommerce and fashion retail fit

Ecommerce is VBB's most natural environment: Shopping feeds carry transaction values by default, removing setup friction. Fashion and apparel retailers with varying product margins can use profit margin as the conversion value (rather than revenue), directing spend toward higher-margin SKUs even if revenue per item is similar. VBB is most powerful where different products or customer segments carry meaningfully different lifetime values — assigning LTV-adjusted values (not just first-purchase revenue) gives the algorithm a better business signal. (Optmyzr, 2026-07-16; business.google.com, modified 2026-03-27)

Per Search Engine Land (2026-02-04): "Don't just count conversions. Differentiate between a customer buying a $20 accessory and one buying a $500 hero product." ^[3]

Every channel running on Smart Bidding now supports some form of VBB, including Search, Shopping, and Performance Max (PMax); Shopping feeds already carry transaction value by default. (Optmyzr, 2026-07-16)

Value assignment example

Per Optmyzr (2026-07-16): for an ecommerce account with a $3,000 AOV and 45% margin where 20% of leads convert:

• First-purchase conversion value = $3,000 × 0.45 × 0.20 = $270
• LTV-adjusted conversion value (adding $5,000 lifetime additional spend at same margin) = ($3,000 + $5,000) × 0.45 × 0.20 = $720

Same customer, very different bid signal depending on which horizon is used (as-of 2026-07-16).

2026 platform changes

June 2026 naming rename

Starting June 2026, Google renamed two bidding strategies with no behavioural change: "Maximize conversions with a Target CPA" became Target CPA, and "Maximize conversion value with a Target ROAS" became Target ROAS; no account adjustment is required. ^[4] (as-of 2026-06-16)

For API developers, the rename means standalone TARGET_CPA and TARGET_ROAS strategy types are prioritised over bundled Maximize strategies with optional targets; developers should review integrations around the BiddingStrategyType enum. (as-of 2026-06-16)

Maximize Conversion Value for Standard Shopping (June 26, 2026)

Google rolled out Maximize Conversion Value bidding for Standard Shopping campaigns without requiring a Target ROAS, narrowing a feature gap that previously pushed advertisers toward Performance Max (PMax) to access value-based bidding. Prior to this, advertisers wanting Maximize Conversion Value without a ROAS constraint often created feed-only PMax campaigns specifically to access the feature. ^[5] (as-of 2026-06-26)

Smart Bidding Exploration

Google's Smart Bidding Exploration lets the algorithm bid on queries with unproven conversion histories, expanding traffic beyond established performance patterns. As of June 15, 2026 it is globally available for Performance Max (PMax) campaigns without product feeds across all languages; for Shopping (standard and PMax with product feeds) it remains in beta. ^[6]

Data Manager API migration (June 15, 2026)

Offline conversion imports and enhanced conversions for leads are migrating to the Data Manager API; the legacy Google Ads API path is blocked for new imports from June 15, 2026 onwards. Any offline conversion pipeline running through scripts, Zapier flows, or third-party tools built on the legacy API path needs to migrate. (Optmyzr, 2026-07-16) (as-of 2026-06-15)

New features (beta, 2026)

• Journey-aware Bidding (beta, announced May 2026): allows advertisers to feed more of the customer journey into optimisation including non-biddable conversions, giving Google AI a fuller picture of what leads to actual sales beyond initial actions like form fills. ^[7] (as-of 2026-05-07)
• Demand-led budget pacing (announced May 2026): AI adjusts spend in real time based on demand signals — higher on high-opportunity days, lower on slow periods, without exceeding campaign limits. Advertisers on total budgets report 66% reduction in manual budget adjustments (Google-stated). (Search Engine Land, 2026-05-07) (as-of 2026-05-07)
• Promotion Mode (beta, June 2026): for Search and PMax — lets advertisers schedule temporary ROAS tolerance relaxation and extra budget for peak windows (flash sales, seasonal events). Distinct from seasonality adjustments: Promotion Mode directly changes ROAS tolerance + budget; seasonality adjustments forecast CVR changes to the model. Not available for Shopping or Display at launch. (Digital Applied, 2026-06-15) (as-of 2026-06-15)

August 17, 2026 — Bidding Target Optimization

Budget-limited campaigns using Target CPA or Target ROAS that have historically over-delivered their stated targets will be steered back toward the target from August 17, 2026. Google's illustrative example: a campaign set to $10 Target CPA delivering at $5 will aim to deliver closer to $10 after August 17. Google does not auto-adjust targets or budgets — advertiser action required. ^[8] (as-of 2026-08-17)

Scope: applies to Search, Shopping, Performance Max (PMax), Demand Gen, Travel, and Display; App campaigns, Video reach campaigns, and Video view campaigns are excluded.

Bid Target Adjustment Tool: available from July 6, 2026 — triggered by account notifications for eligible advertisers — surfaces three options: keep the current target, match the target to recent performance, or set a custom target based on business economics. (as-of 2026-06-15)

Google Ads Liaison Ginny Marvin stated on June 15, 2026: "We're making backend bidding target optimization updates to help campaigns limited by budget see more predictable performance in line with CPA and ROAS targets." (cited in Digital Applied, 2026-06-15)

Note on historical guidance reversal: starting August 17, Google states Smart Bidding reacts to target changes in real time and the historic "do not change a target by more than 20% or more than once per two weeks" guidance is being phased out, replaced by advice to wait one to two full conversion cycles before judging results. (Optmyzr, 2026-07-16) (as-of 2026-07-16)

Performance benchmarks

Lyra PPC 2026 empirical study (94 accounts, $3.01M spend, 522 campaigns, June 2025–April 2026): Maximize Conversion Value campaigns averaged 6.44x ROAS vs 1.96x for Maximize Conversions campaigns. Note: comparison is not controlled for account quality, spend level, or industry mix; treat as directional signal only. ^[10] (as-of 2026)

When NOT to use VBB

Per Optmyzr (2026-07-16):

• Every conversion is genuinely worth the same amount to the business (flat-value; use Target CPA instead)
• Conversion volume is below the eligibility threshold
• Long sales cycle (60–90+ days) without an offline conversion import pipeline to report later-stage outcomes back to Google
• New account with no conversion history

Lead-gen accounts with a genuinely long sales cycle that lack offline conversion imports face a structural mismatch: the conversion action that best represents real value is typically the one with the least volume, making fragmented campaign structures (by programme or geography) worse rather than better. (Optmyzr, 2026-07-16)

Common failure modes

Per Optmyzr / Frederick Vallaeys ^[1]:

• Value staleness: no automatic alert when a value assumption goes stale; the algorithm optimises toward whatever it was told, even if the economics have shifted.
• Conversion value stacking in multi-step funnels: tracking lead ($10) + SQL ($20) + sale ($50) all as primary conversions causes Google to sum them ($80) for a user who completes all three — inflating the value signal and teaching Smart Bidding the wrong lesson.
• Stakeholder-driven tROAS: targets set to satisfy internal reporting rather than derived from margin or deal economics misalign the bid algorithm from the start.
• Learning period judgement: tROAS performance should be evaluated after one to two full conversion cycles, not during the learning phase.
• Fragmented campaign structure: accounts split too granularly fail to accumulate sufficient volume per primary conversion action for reliable VBB.
• GA4 modelled data gap: GA4 uses data-driven attribution blended with modelled estimates (to fill consent-mode cookie loss), meaning the "conversion" in the CRM and in Google Ads may already be built from partially different data before any value adjustment is applied (as-of 2026-07-16).

Key terms

Term	Meaning
VBB	Value-Based Bidding — optimising bids for conversion value, not just conversion count
Target ROAS (tROAS)	The efficiency-constrained VBB strategy; formerly "Maximize conversion value with tROAS" (renamed June 2026)
Maximize Conversion Value	The unconstrained VBB strategy; captures maximum total value within budget
Conversion Value Rules	Auction-time adjustments to conversion values based on audience, device, or location
Smart Bidding Exploration	Feature letting tROAS campaigns bid on unproven query categories
Bidding Target Optimization	August 17, 2026 enforcement change steering over-performing campaigns back to stated targets
Promotion Mode	Beta feature for scheduling temporary ROAS relaxation during peak windows
Journey-aware Bidding	Beta feature feeding mid-funnel non-biddable signals into the bid model
Demand-led budget pacing	AI feature auto-adjusting daily spend based on real-time demand signals

See also

• Smart Bidding — parent strategy family
• Break-Even ROAS — how to derive the tROAS target from margin economics
• POAS (Profit on Ad Spend) — profit-first alternative to revenue-based tROAS
• Performance Max (PMax) — primary channel for VBB at scale
• AI Max for Search — related Google Ads AI expansion feature
• Data Manager API — required for offline conversion imports post-June 2026
• Google Shopping — channel where Shopping feed values make VBB most frictionless
• Demand Gen — another channel in scope for the August 2026 enforcement change
• Customer Lifetime Value (CLV) — the horizon used for LTV-adjusted conversion values

References

1. Optmyzr / Frederick Vallaeys, 2026-07-16: — www.optmyzr.com/blog/value-based-bidding-guide
2. Google Help Center: — support.google.com/google-ads/answer/15099424
3. searchengineland.com/in-google-ads-automation-everything-is-a-signal-in-2026-468218
4. Google Ads Developer Blog, 2026-06-16: — ads-developers.googleblog.com/2026/06/updates-to-smart-bidding-strategy.html
5. Search Engine Land, 2026-06-26: — searchengineland.com/google-brings-maximize-conversion-value-bidding-to-standard-shopping-481209
6. Digital Applied, 2026-06-15: — www.digitalapplied.com/blog/google-ads-bidding-budgeting-overhaul-june-2026-ppc-playbook
7. Search Engine Land, 2026-05-07: — searchengineland.com/google-adds-ai-powered-bidding-and-demand-led-budgeting-to-search-and-shopping-476744
8. Google Ads Help Center, answer/17061251, 2026: — support.google.com/google-ads/answer/17061251
9. Source: , published 2025-10-14, modified 2026-03-27 — business.google.com/uk/resources/articles/increase-your-roi-with-value-based-bidding
10. Lyra PPC State of Google Ads 2026: — www.lyrappc.com/reports/state-of-google-ads-2026