Will YouTube ads revenue growth remain below 10% YoY in both Q1 and Q2 2026?

YouTube ads grew +9% in Q4 2025 (one quarter below the 10% threshold). The question requires BOTH Q1 AND Q2 to be below 10%. Q4 deceleration was attributed to election spend lapping — political advertising creates a one-time comparison headwind. Q1 2025 did not have the same election spend, so the YoY comparison normalizes. This strongly suggests Q1 2026 should show a rebound above 10%. For both quarters to be below 10%, the structural deceleration thesis must be correct AND there must be additional headwinds. Setting at 28% — the election lapping explanation is credible and Q1 comparison normalizes.

The requirement that BOTH Q1 AND Q2 be below 10% is stringent. YouTube was at +15% in Q3 2025 before the Q4 deceleration. The prior trajectory suggests underlying growth rate is 12-15%, with Q4 depressed by election lapping. For both H1 quarters to be sub-10%, YouTube would need to have genuinely lost structural growth capacity — meaning the +15% Q3 was the anomaly, not the +9% Q4. This contradicts the committee's assessment that YouTube's $60B annual revenue base is fundamentally healthy. Network ads declining (-2%) provides a structural precedent, but YouTube's product (video ads, CTV, Shorts) is categorically different from programmatic display. Setting at 22%.

The structural risk deserves more weight than the election lapping narrative suggests. Short-form video (TikTok, Instagram Reels) is genuinely taking ad market share from YouTube in certain demographics. YouTube's content cost structure is also rising (NFL Sunday Ticket). Even if Q1 rebounds to 10-12%, Q2 could slip back below 10% if the structural headwinds persist. The 30% probability accounts for a scenario where the election lapping explanation is partially correct (Q1 rebounds to 10-11%) but structural forces keep Q2 below 10%. The question requires BOTH quarters, which is the critical constraint.

Election lapping is a credible explanation for Q4 deceleration. Q1 comparisons normalize. YouTube at +15% Q3 suggests underlying health. Both quarters below 10% is unlikely unless there's a genuine structural break. Setting at 25%.

I give structural risk more weight. YouTube ads decelerated from +15% to +9% in one quarter — even accounting for election lapping, that's a sharp drop. CTV ad market is increasingly competitive with Amazon Prime Video, Netflix, Disney+, and Peacock all selling ads. YouTube Shorts monetization may be at lower rates than traditional YouTube ads. If the ad market softens at all in H1 2026, YouTube could stay below 10% in both quarters. The 6pp sequential deceleration suggests more than just election lapping.

The stringent requirement (BOTH quarters) makes this unlikely. Even if Q1 is borderline (9-11%), Q2 comparisons against Q2 2025 (when YouTube was growing mid-teens) should normalize further. The market for YouTube ads is fundamentally healthy at $60B+ annual revenue. Setting at 23%.

Election lapping explains Q4. Q1 comparisons normalize. Both quarters below 10% unlikely. Setting at 27%.

YouTube at $60B+ with +15% Q3 growth. Q4 dip was election-related. Both quarters below 10% requires structural break. Low probability. Setting at 20%.

Possible if structural headwinds from short-form video and CTV competition persist. But election lapping normalization should help Q1. Setting at 30% — the structural case has some merit.