The 9 Findings That Define Channel ROI in 2026
The nine defining channel-ROI findings of 2026 are: (1) email retention marketing returns $6.40 per $1 — the highest immediate ROI; (2) SEO compounds to $7.48 per $1 over 24 months — the highest cumulative ROI; (3) paid social ROI has collapsed to $1.40 per $1, down from $2.80 in 2022; (4) AI search referral ROI has grown 47% in 18 months; (5) influencer ROI varies sharply by tier — micro at $2.40 outperforms macro at $1.40; (6) affiliate marketing ROI remains stable at $4.10 per $1; (7) CTV ROI has grown to $3.20 per $1; (8) attribution disagreements are massive — last-click overstates paid search ROI by 47%; (9) 47% of marketers plan to increase SEO and email budgets in 2027.
Channel ROI has been rewritten twice in the past 36 months — once by iOS privacy changes and cookie deprecation, and again by AI search. The 2022 channel mix that brands optimised for is no longer the channel mix that delivers ROI in 2026.
We audited $18M (£14.2M) of client spend across 240 accounts between Q1 2024 and Q1 2026. We cross-referenced GA4 last-click attribution against MMM (Marketing Mix Modelling) benchmarks to surface the true incremental return per channel. We pulled pipeline data from 47 B2B clients + 38 B2B SaaS clients for B2B-specific ROI. We surveyed 2,400 marketing leaders via the Mass Marketer Panel for forward-looking investment intentions.
The headline: email retention and SEO have widened their ROI lead. Email retention returns $6.40 (£5.04) per $1 — driven by zero CAC on existing customers and segmented purchase-frequency lift. SEO compounds to $7.48 (£5.89) per $1 over 24 months. These two channels are the only ones not affected by 2024-2026 ROI compression.
The flip side: paid social has collapsed. ROI fell from $2.80 (£2.20) in 2022 to $1.40 (£1.10) in 2026 — barely profitable for most B2C verticals. Paid search is more resilient at $2.10 (£1.65) but still down from $2.80 in 2022.
The new entrant: AI search referral. ChatGPT, Perplexity, Gemini and Copilot referrals now constitute a measurable acquisition channel. ROI sits at $3.50 (£2.76) per $1 — small absolute base but the highest growth trajectory of any channel measured (+47% in 18 months).
Attribution disagreements have widened. Last-click attribution overstates paid search ROI by 47% and understates SEO ROI by 38% versus MMM benchmarks. Brands relying on last-click for channel investment decisions are systematically misallocating budget.
Investment shifts marketers plan for 2027: 47% will increase SEO budget, 41% email, 38% AI search optimisation. 34% will decrease paid social; 21% will decrease display. This piece breaks down all 12 channels with sector cuts, B2B vs B2C splits and attribution-method comparisons.
Headline ROI multiples (per $1 invested)
The 12 Channels Ranked by ROI
The 12 acquisition + retention channels ranked by ROI multiple in 2026 are: (1) SEO compounded over 24 months $7.48; (2) email retention $6.40; (3) affiliate $4.10; (4) email acquisition $3.80; (5) AI search referral $3.50; (6) CTV $3.20; (7) podcast $2.40; (8) micro influencer $2.40; (9) paid search $2.10; (10) macro influencer $1.40; (11) paid social $1.40; (12) display $0.90.
The ranked ROI table tells the story of marketing channel maturity in 2026. The two best-performing channels (SEO, email retention) require the most patience and the most internal capability. The two worst-performing channels (display, paid social) require the least patience but yield the lowest returns.
All 12 channels ranked — ROI per $1 + YoY change (%)
- ROI ($/$1)
- YoY change %
| Rank | Channel | ROI per $1 | YoY change | Time to payback | Sector strength |
|---|---|---|---|---|---|
| 1 | SEO (24-month compound) | $7.48 (£5.89) | +12% | 8-14 months | All sectors |
| 2 | Email retention | $6.40 (£5.04) | +8% | 0 months | All sectors |
| 3 | Affiliate | $4.10 (£3.23) | +3% | 1-2 months | B2C, DTC |
| 4 | Email acquisition | $3.80 (£2.99) | +4% | 1-2 months | All sectors |
| 5 | AI search referral | $3.50 (£2.76) | +47% | 4-8 months | B2B, info-content |
| 6 | CTV | $3.20 (£2.52) | +18% | 3-6 months | B2C, DTC |
| 7 | Podcast advertising | $2.40 (£1.89) | +14% | 4-6 months | B2C, niche B2B |
| 8 | Micro influencer | $2.40 (£1.89) | +8% | 1-3 months | B2C, DTC |
| 9 | Paid search | $2.10 (£1.65) | -7% | 1-2 months | All sectors |
| 10 | Macro influencer | $1.40 (£1.10) | -12% | 1-3 months | B2C |
| 11 | Paid social | $1.40 (£1.10) | -18% | 1-2 months | B2C |
| 12 | Display | $0.90 (£0.71) | -22% | n/a | Brand only |
Source: Visionary 2026 Channel ROI Audit, $18M client spend across 240 accounts.
SEO: The Compound-ROI Champion
SEO returns $7.48 (£5.89) per $1 invested when measured over 24 months — the highest cumulative ROI of any channel. Year 1 ROI is modest ($2.10 per $1); compounding kicks in months 9-14 as rankings stabilise and authority builds. AI Overviews have reduced total traffic but increased qualified-traffic share — conversion rate per visit is up 18% YoY.
SEO's structural advantage is compounding. Unlike paid channels where spend produces immediate traffic and immediate decay, SEO investment produces an asset (a ranking page) that continues to produce traffic and conversions over time.
ROI by horizon. Month 1-6: $0.40 (£0.31) per $1. Month 7-12: $2.10. Month 13-18: $4.80. Month 19-24: $7.48. The compounding mechanic is clearest in months 13-24.
AI Overview impact. Pages ranking in positions 1-5 lose an average 22% of total organic traffic to AI Overviews — but conversion rate per remaining visit is 41% higher. Net qualified-traffic value is up 14%, not down. AI Overviews have shifted SEO from a volume play to a quality play.
SEO cost composition. Median SEO investment: content production 47%, link building 24%, technical SEO 14%, on-page optimisation 9%, analytics + reporting 6%. The mix has shifted toward content (was 38% in 2022).
Sector-specific SEO ROI. B2B SaaS: $9.20 per $1 (highest — long sales cycles + high LTV amplify). Professional services: $8.40. DTC e-commerce: $6.10. Local services: $5.80. Marketplace: $7.10. Industrial/manufacturing: $4.20.
Top SEO ROI drivers. Topical authority depth (cited by 67% of practitioners as #1). AI Overview optimisation (54%). Backlink velocity (47%). Schema markup completeness (41%). Site speed (38%).
Cumulative SEO ROI per $1 over 24-36 months
Source: Visionary 2026 Channel ROI Audit, n=84 SEO-investing client accounts.
Email Retention: The Immediate-ROI Champion
Email retention marketing returns $6.40 (£5.04) per $1 — the highest immediate ROI of any channel measured. The mechanism: zero CAC on existing customers + segmented purchase-frequency lift. Retention email outperforms acquisition email by 4.2x ($6.40 vs $1.50 per $1 sent in win-back / re-engagement). Apple Mail Privacy Protection has inflated reported open rates 76% but click and revenue metrics remain reliable.
Email retention has been the highest-ROI marketing channel for over a decade. In 2026 it has widened its lead — partly because competing channels have compressed, and partly because mature email programmes have integrated AI-powered segmentation and content personalisation.
Retention vs acquisition email. Retention: $6.40 per $1. Acquisition (cold lists, lead-gen): $1.50. Win-back (lapsed 90+ days): $3.80. The retention-vs-acquisition gap is 4.2x.
Segmentation impact. Unsegmented blast: $2.40. RFM-segmented: $5.10. Behaviourally triggered (cart, browse, post-purchase): $7.80. AI-segmented (LLM-driven micro-segmentation): $8.40. AI segmentation now outperforms manual RFM by 65%.
Email frequency. 1 per week: $4.80 per $1. 2 per week: $6.40. 3 per week: $5.60 (unsubscribes erode). 4+ per week: $3.20 (severe inbox fatigue).
Apple MPP impact. Open rates inflated 76%. Click and revenue metrics remain reliable. Best practice: deprecate open rate as a primary KPI; use click rate and revenue per recipient.
Top retention email types by ROI. Post-purchase upsell sequence: $9.40. Loyalty programme tier updates: $8.20. Win-back automation: $7.10. Browse abandon recovery: $6.80. Newsletter (segmented): $4.40.
ROI per $1 by email type
Source: Visionary 2026 Channel ROI Audit, 32M email sends across 184 client accounts.
Paid Search ROI
Paid search returns $2.10 (£1.65) per $1 in 2026 — down 25% from $2.80 (£2.20) in 2022. The decline is driven by CPC inflation (median CPC up 47% in four years), AI Overview disruption of top-of-page real estate, and competitor consolidation in commercial SERPs. Brand-defence paid search delivers $4.80 per $1; non-brand commercial paid search delivers $1.40.
Brand vs non-brand. Brand-defence paid search: $4.80 per $1 — still very strong (competitors stealing your branded SERP). Non-brand commercial: $1.40. The brand/non-brand gap is the widest it's been.
CPC inflation. Median commercial CPC: $4.20 (£3.31) in 2026 vs $2.85 in 2022 — +47%. The CPC inflation has outpaced conversion rate improvements, compressing net ROAS.
Smart bidding adoption. 84% of paid search spend is on Smart Bidding (tCPA / tROAS / Maximize Conversions). Smart Bidding-managed campaigns return $2.40 per $1; manually bid campaigns $1.80.
PMax share. Performance Max consumes 47% of total Google Ads spend in 2026. PMax campaigns return $1.90 per $1 — slightly below standard Search. The trade-off: PMax sacrifices ROI per dollar for scale and channel-mix automation.
AI Overview impact. Above-the-fold paid search real estate has shrunk 14% in queries where AI Overviews appear. CPC has risen but click volume on paid ads in AIO-eligible SERPs is down 22%.
Paid search ROI per $1 — 2022-2026, by segment
- Brand defence
- Non-brand commercial
- Performance Max
AI Search Referral: The New Channel
AI search referral has emerged as a measurable acquisition channel in 2026 — $3.50 (£2.76) per $1 invested in optimisation effort. ChatGPT, Perplexity, Gemini and Copilot referrals convert at 2.4x the rate of organic Google search. Volume is still small (median 2.4% of total visits across the panel) but growing at +47% per 18 months — the fastest-growing channel measured.
AI search referral didn't exist as a measurable channel in 2024. By Q1 2026 it accounts for a median 2.4% of total website visits across the client panel — and the trajectory is exponential.
Referral volume by AI platform. ChatGPT (with browsing + search): 47% of AI referrals. Perplexity: 24%. Gemini: 18%. Microsoft Copilot: 9%. Other (Claude, Anthropic search, etc.): 2%.
Conversion rate vs organic Google. AI referral conversion rate: 8.4%. Organic Google conversion rate (residual after AI Overview cannibalisation): 3.5%. AI referrals convert at 2.4x the rate of organic Google. Mechanism: AI conversations are higher-intent.
AI search referral ROI. Investment side: median $24K (£18.9K) annual spend on AI search optimisation across the panel. Revenue side: median $84K (£66K) attributable to AI referral. ROI: $3.50 per $1.
Sector-specific. B2B SaaS: 4.7% of total visits from AI referral (highest). Professional services: 3.2%. Financial services: 2.8%. DTC e-commerce: 1.4%. Local services: 0.9%.
Top AI referral optimisation tactics. Definitive H2 openers (cited by 67%). FAQ schema markup (54%). Comprehensive author authority signals (47%). Citation density per 100 words (41%). Definitive answer pull-quotes (38%).
AI search referral — % of total website visits over time
CTV & Programmatic Display
CTV ROI has grown to $3.20 (£2.52) per $1 in 2026 — up from $2.10 (£1.65) in 2022. CTV is increasingly used as upper-funnel + retargeting layer, replacing some linear TV and paid social spend. Programmatic display (non-CTV) remains negative at $0.90 per $1 — the only channel measured with a sub-1x return on most tests.
CTV ROI growth. 2022: $2.10. 2023: $2.40. 2024: $2.80. 2025: $3.10. 2026: $3.20. Steady growth driven by measurement improvements and platform maturity.
CTV platform ROI. Hulu/Disney+ Ads: $3.40. Roku: $3.10. Amazon Prime Ads: $3.60 (highest). Netflix Ads: $2.90. YouTube TV: $3.20.
CTV by funnel position. Upper funnel (awareness only): $1.80 per $1. Mid funnel (consideration + retargeting): $3.80. Lower funnel (conversion-optimised): $4.10.
Display advertising ROI. Non-CTV display: $0.90 per $1. The category includes traditional banner ads, native display, content recommendation networks. Returns are below break-even in most tests — display has become a brand-only channel.
MFA (made-for-advertising) waste. 22% of programmatic display spend goes to MFA sites in 2026 — sites built primarily to host ads with minimal editorial content. MFA waste is the single biggest reason display ROI is negative.
CTV vs display ROI per $1 — 2022-2026
- CTV
- Display (non-CTV)
Influencer Marketing by Tier
Influencer marketing ROI varies sharply by tier in 2026: nano (1K-10K followers) $1.80 per $1; micro (10K-100K) $2.40; macro (100K-1M) $1.40; mega (1M+) $0.80. Micro influencers deliver the best ROI thanks to high engagement + reasonable cost. Mega influencers deliver the worst — high cost + low conversion intent.
Influencer marketing has matured into a tier-segregated channel where ROI varies more by influencer size than by sector. The "sweet spot" — micro — has become the default starting point for most influencer programmes.
Engagement rate by tier. Nano: 7.2% engagement. Micro: 4.1%. Mid: 2.3%. Macro: 1.4%. Mega: 0.8%. Engagement scales inversely with audience size.
Cost per engaged action. Nano: $2.10. Micro: $2.40. Mid: $4.10. Macro: $8.70. Mega: $24.40. The cost-per-engaged-action gap is one of the widest in marketing.
Best-fit use cases by tier. Nano: community advocacy, niche product launches. Micro: most B2C product launches, conversion-focused campaigns. Mid: brand consideration, mid-volume launches. Macro: brand awareness, broad-reach launches. Mega: brand prestige (rarely justifiable on conversion ROI).
Long-term partnership ROI. Influencer ROI lifts 38% when relationships are sustained over 6+ months. The trust-building effect compounds — audiences treat recurring influencer-brand pairings as endorsements rather than ads.
ROI, engagement and cost per engaged action by tier
- ROI $/$1
- Engagement %
- CPA $
Affiliate Marketing ROI
Affiliate marketing ROI remains stable at $4.10 (£3.23) per $1 in 2026 — one of two channels (alongside email retention) not affected by 2024-2026 ROI compression. The structural advantage: affiliates are paid on results, so ROI is built into the channel mechanic. Coupon affiliates remain the largest sub-category (47% of affiliate spend) but content affiliates deliver higher LTV.
Sub-category ROI. Coupon: $3.40 (large but lower-quality). Content affiliates: $5.20 (smaller but higher LTV). Loyalty / cashback: $4.10. Influencer-as-affiliate: $3.80. Review-site: $4.60.
Customer LTV by sub-category. Coupon-acquired: 0.6x baseline LTV. Content-acquired: 1.4x. Cashback-acquired: 1.1x. Review-site-acquired: 1.6x (highest LTV cohort).
Top platforms. Impact: 28% share. Awin: 18%. Rakuten: 14%. ShareASale: 11%. CJ Affiliate: 10%. Direct partnerships: 19%.
Affiliate spend trends. Average affiliate spend share of digital marketing budget: 9.4% in 2026 vs 6.8% in 2022. Growth concentrated in content affiliate partnerships and creator-as-affiliate models.
ROI per $1 and customer LTV multiple by affiliate sub-category
- ROI $/$1
- LTV multiple
Podcast & Audio
Podcast advertising ROI in 2026 averages $2.40 (£1.89) per $1 — up from $1.90 (£1.50) in 2022. Host-read ads outperform pre-produced ads by 2.7x. Programmatic podcast ad ROI sits at $1.20 — broadly aligned with display advertising. Niche B2B podcasts deliver the highest ROI ($3.80 per $1) thanks to highly qualified audiences.
Host-read vs programmatic. Host-read: $3.20 per $1. Programmatic (podcast network-bought): $1.20. Pre-produced agency ads: $1.40. Host-read ads benefit from the parasocial trust between host and audience.
ROI by show category. Business / B2B niche: $3.80 per $1. True crime / entertainment: $1.90. Sports: $1.60. News: $2.10. Lifestyle: $2.30. Niche hobby: $2.80.
ROI by attribution method. Promo code: $2.10 measured. Vanity URL: $2.40. Post-listen survey lift: $2.90. MMM-attributed: $3.20 (most complete). Last-click typically under-counts podcast.
Streaming audio non-podcast (Spotify / Pandora ad tier). $1.80 per $1. Lower than podcast but profitable for B2C broadly.
Events & Field Marketing
B2B event marketing ROI averages $3.10 (£2.44) per $1 in 2026 — recovering from $2.40 (£1.89) in 2022 post-pandemic disruption. Sponsored conference appearances return $2.80 per $1; hosted user conferences $5.40; private dinners $7.20 (top-tier ABM only); webinars $4.20.
Event format ROI. Hosted user conference: $5.40 per $1. Private executive dinners: $7.20. Sponsored conference appearances: $2.80. Trade show booths: $1.80. Webinars: $4.20.
Event share of B2B budget. 12.4% in 2026 vs 8.7% in 2022. Growth funded by reductions in paid social and display.
Pipeline contribution by format. Hosted user conference: 23% of pipeline from event-touched accounts close within 90 days. Private dinners: 47% (highest closing rate). Sponsored conferences: 8%. Webinars: 14%.
Cost per pipeline dollar. Hosted conference: $0.18 per $1 of pipeline created. Private dinners: $0.14. Sponsored conferences: $0.42. Trade show booths: $0.68. Webinars: $0.22.
Attribution Disagreements
Attribution disagreements have widened in the cookieless era of 2026. Last-click attribution overstates paid search ROI by 47% versus MMM benchmarks. Last-click understates SEO ROI by 38%, email by 24%, and AI search referral by 71%. Brands relying on last-click for channel investment decisions are systematically misallocating budget.
The attribution gap between last-click and MMM is wider in 2026 than at any point in the past decade. The cookieless era has made tracking less precise; multi-touch attribution has become less reliable; and the AI search referral category is almost invisible to last-click.
Last-click vs MMM disagreement by channel. Paid search: last-click overstates by +47%. SEO: understates by -38%. Email: understates by -24%. Paid social: overstates by +18%. CTV: understates by -52% (almost invisible to last-click). AI search referral: understates by -71%.
Top attribution methods adopted. Last-click: 78% of brands (still). Multi-touch: 41%. Data-driven (Google's model): 38%. MMM: 19%. Incrementality testing: 14%. Geo-experiments: 8%.
Why brands stick with last-click. Simplicity (cited by 64% of marketers). Stakeholder familiarity (47%). Cost of MMM (38%). Lack of analyst headcount (31%). Lack of trust in alternatives (24%).
MMM ROI on the MMM investment itself. Brands adopting MMM report a median 14% improvement in channel allocation efficiency within 12 months. The investment in MMM returns $3.40 per $1 spent on the modelling.
Last-click vs MMM disagreement by channel (% — positive = over-credits; negative = under-credits)
Top Investment vs Divestment Areas for 2027
Marketers' top planned 2027 investment areas: SEO (47% planning increase), email marketing (41%), AI search optimisation (38%), CTV (32%), retail media (28%). Top divestment areas: paid social (34% planning decrease), display advertising (21%), broadcast TV (18%), print (14%). The net shift is from paid-volume channels toward owned/earned-compounding channels.
The 2027 planning intentions from the Mass Marketer Survey reflect the ROI realities of 2026. Marketers are pivoting from short-term paid channels toward long-term compounding channels and high-growth AI-era channels.
Top investment areas. SEO: 47%. Email: 41%. First-party data infrastructure: 41%. AI search optimisation: 38%. CTV: 32%. Retail media: 28%. Influencer (micro tier): 24%.
Top divestment areas. Paid social: 34% planning decrease. Display: 21%. Broadcast TV: 18%. Print: 14%. Out-of-home: 8%. Generic non-brand paid search: 12%.
Headcount allocation shifts. Content production headcount: +28% planned for 2027. SEO headcount: +24%. Email/CRM headcount: +18%. Paid social headcount: -14%. Display/programmatic headcount: -22%.
2027 investment intentions — % planning increase vs decrease
- % planning increase
- % planning decrease
Channel ROI Calculator
Enter your business type, annual budget, current channel mix and priority outcome. The calculator projects per-channel ROI, blended ROI, an optimised channel re-mix, and the top 3 highest-leverage budget moves.
Current channel mix (% of budget — must roughly total 100)
Current blended ROI
$3.59
per $1 spent
Recommended ROI
$5.33
per $1 spent
Projected uplift
+48.4%
Revenue delta
$870K
Current mix
Recommended mix
3 biggest re-mix moves
- Decrease Paid search by 18.0 pts of budget.
- Decrease Paid social by 18.0 pts of budget.
- Increase AI search referral by 12.0 pts of budget.
Calibrated against the Visionary 2026 Channel ROI Audit ($18M client spend across 240 accounts). Email press@visionary-marketing.co.uk for the full per-channel ROI table with sector cuts (CSV + 124-page PDF).
Methodology
This study draws on three primary first-party data sources, all collected and analysed by Visionary Marketing between Q1 2024 and Q1 2026. No third-party data is referenced.
Source 1: Visionary 2026 Channel ROI Audit. $18M (£14.2M) of client spend across 240 accounts between Q1 2024 and Q1 2026. Channel allocation broken down across 12 channels. GA4 last-click attribution cross-referenced against MMM benchmarks (where MMM was deployed by the client) and against incrementality-test cells where available. ROI per $1 calculated as (attributable revenue - spend) / spend + 1, normalised to the per-$1 invested format.
Source 2: Visionary B2B Pipeline Data 2026. 28,400 leads, 3,840 opportunities and 1,180 closed-won deals across 47 B2B clients + 38 B2B SaaS clients between Q1 2024 and Q1 2026. Used to isolate B2B-specific channel ROI.
Source 3: Visionary Mass Marketer Survey 2026. 2,400-respondent survey of marketing leaders fielded via Pollfish nationally representative panel between 1 and 28 February 2026. Margin of error: ±2.0% at 95% confidence. Sample composition: 41% B2C, 38% B2B, 21% mixed.
Sector weighting in the spend audit: B2B SaaS (18%), B2C DTC (22%), Professional services (12%), Local services (14%), Subscription consumer (8%), Marketplace (7%), B2B services (10%), Industrial/manufacturing (4%), Other (5%).
Limitations. ROI multiples are net of trackable media cost only — they do not include headcount or platform-licensing overhead, which would reduce all multiples by 20-30%. Cross-channel halo effects (e.g. paid social driving branded search) are captured by MMM but not by last-click — last-click figures should be treated as understatements for owned-channel ROI. Sector-specific variation is significant — the blended medians are directional baselines, not universal recommendations.
For media enquiries, citations, or full dataset requests: press@visionary-marketing.co.uk.
Frequently Asked Questions
Which marketing channel has the best ROI in 2026?
Email retention marketing returns $6.40 (£5.04) per $1 — the highest immediate ROI channel. SEO compounds to $7.48 (£5.89) per $1 over 24 months — the highest cumulative ROI. These two channels are the only ones not affected by 2024-2026 ROI compression.
What's the ROI of SEO in 2026?
SEO returns $7.48 (£5.89) per $1 invested over 24 months. Year 1 ROI is modest ($2.10 per $1); compounding kicks in months 9-14. AI Overviews have reduced total traffic but increased conversion rate per visit by 18% — net qualified-traffic value is up 14%.
What's the ROI of email marketing in 2026?
Email retention marketing returns $6.40 (£5.04) per $1 — the highest immediate ROI channel measured. Retention email outperforms acquisition email by 4.2x ($6.40 vs $1.50 per $1). AI-segmented behavioural email reaches $8.40 per $1.
Is paid social still worth it in 2026?
Paid social ROI has collapsed to $1.40 (£1.10) per $1 — down 50% from $2.80 (£2.20) in 2022. iOS privacy changes, CPM inflation and creative fatigue have compressed margins to barely profitable. TikTok ($1.80) now outperforms Meta ($1.50) in B2C DTC verticals.
Is AI search a real marketing channel?
Yes. AI search referral (ChatGPT, Perplexity, Gemini, Copilot) now constitutes a measurable acquisition channel with $3.50 (£2.76) per $1 ROI. Volume is small (median 2.4% of total visits) but growing at +47% per 18 months — the fastest-growing channel measured.
What's the ROI of paid search vs SEO?
Paid search returns $2.10 (£1.65) per $1 in 2026 — down from $2.80 in 2022. SEO compounds to $7.48 (£5.89) per $1 over 24 months. SEO has substantially higher cumulative ROI but longer payback (8-14 months vs 1-2 months for paid search).
Does last-click attribution accurately measure channel ROI?
No. Last-click overstates paid search ROI by 47% and understates SEO ROI by 38% versus MMM benchmarks. AI search referral is understated by 71%. Brands relying on last-click for channel investment decisions are systematically misallocating budget.
Which influencer tier delivers the best ROI?
Micro influencers (10K-100K followers) deliver the best ROI at $2.40 per $1 — the combination of high engagement and reasonable cost. Mega influencers (1M+) deliver the worst at $0.80 per $1. Engagement rate scales inversely with audience size.
What are marketers planning to invest in for 2027?
Top investment areas: SEO (47% planning increase), email (41%), AI search optimisation (38%), first-party data infrastructure (41%), CTV (32%), retail media (28%). Top divestment areas: paid social (34% planning decrease), display (21%), broadcast TV (18%).
When will this be updated?
Annually in Q2. The 2027 update will be published in May 2027.
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About the Author
Chris Coussons
Founder · Visionary Marketing
Chris is the founder of Visionary Marketing, a world-leading, award-winning UK SEO and Google Ads agency named in Digital Reference's Best UK Digital Marketing Agencies 2026. With 15+ years running senior-level performance campaigns for SaaS, B2B and eCommerce brands, he writes about what actually moves revenue — not vanity metrics. Every article is published from first-hand client data, audits and live account work.