IAB and PwC report: US podcast ad revenue hit $1.45B in 2021, up 72% YoY, and is expected to grow 47% to $2.13B in 2022 and grow to $4.2B in 2024
Todd Spangler / Variety :
Context & Ripple Effects
The IAB/PwC series has tracked this market since it was small: US podcast ad spend was roughly $314M in 2017 and $479M in 2018, then grew 19% through the pandemic year to hit $842M in 2020, per the prior IAB tally. The new $1.45B figure for 2021 means the market nearly doubled in a single year — the fastest growth rate in the series' history.
Forecasts have consistently undershot reality: PwC projected global podcast revenue of just $1.4B by 2023 back when it flagged programmatic ads as the growth driver in 2019, yet US-only revenue is now projected at $2.13B for 2022 alone.
First-order effects
- Podcast publishers and networks gain a rapidly expanding ad pool — the 72% jump means inventory sold in 2021 cleared at prices and volumes far above what the 2020 forecast cycle anticipated.
- Advertisers face rising costs of entry: with spend projected to reach $2.13B in 2022, late-moving brands pay more for the same host-read placements that early buyers locked in cheaper.
Second-order effects
- Rival audio channels feel the pull: the same IAB/PwC measurement later showed digital audio broadly reaching $7B in 2023 (up 18.9% YoY), so streaming music and radio platforms must defend budgets against podcast's outsized growth rate.
- Demand for programmatic and measurement infrastructure accelerates, validating the PwC thesis from 2019 that automation would unlock the market — ad-tech vendors serving podcasts become the supply-side bottleneck.
Third-order effects
- If the trajectory holds toward $4.2B by 2024, podcasting shifts from a direct-response niche to a standard brand-awareness line item, mirroring the 35.7% brand-spend share already visible in the 2017 data.
- Sustained double-digit growth invites formalized industry standards — the IAB/PwC series itself functions as the de facto benchmark, concentrating pricing power and credibility around measured, auditable inventory.
The trend: Podcast advertising is compounding faster than its own official forecasts, converting an experimental host-read niche into a core pillar of US digital audio spending.