UK current account switching isn't evenly distributed across the year, it has a predictable seasonal rhythm that's repeated for five straight years. That raises an obvious question for anyone running acquisition marketing in this category: is your spend actually timed to that rhythm, or running on its own internal calendar regardless of when customers are actually switching? Pulling six months of current-account-flagged ad activity from Meta's Ad Library across 21 UK brands and holding it up against the known seasonal pattern gives a first real answer.
This is a seasonal product
Personal current account switching follows the same shape every year since CASS launched: a sharp dip every May, a steady climb through summer and autumn, and a peak in October or November, before falling back in December. This has held in 2021, 2022, the record year of 2023, and again in 2024 and 2025. Whatever drives the May trough, most likely a post-tax-year-end lull combined with reduced incentive activity industry-wide, it shows up reliably every single year.
This matters for what follows: if the calendar is this predictable, a marketing team that wants to compete efficiently has a known curve to plan against, rather than a genuinely unpredictable market.
Six months of ad spend, brand by brand
Against that backdrop, here's what 21 UK brands actually spent on current-account-flagged Meta ads from January to June 2026. The patterns split into four distinct groups, and almost none of them look like a direct response to the seasonal curve above.
Front-loaded, then pulled back — Monzo. Monzo peaks hard in March (179 ads), then drops to near-silence by May and June (8, then 6). That's the closest thing in this dataset to "spend while the market is building, go quiet once things historically slow down," though March is early relative to the actual autumn peak.
Counter-seasonal — Zopa and HSBC. Both brands increase into May, historically the lowest-switching month of the year (Zopa: 101 ads in April rising to 192 in May; HSBC: 6 in March rising to 37 in May). That's either a deliberate bet that May is cheaper and less contested precisely because competitors back off, or it reflects a campaign/product-launch timeline that has nothing to do with the switching calendar and simply lands there by coincidence.
Campaign-driven, not calendar-driven — Lloyds and Barclays. Lloyds is silent for almost the entire window except a single sharp spike in March (154 ads, dwarfing every other month it ran all year). Barclays sustains real volume from February through April, then drops off sharply. Neither shape tracks the CASS seasonal curve in any visible way, both look more like internally-timed launches or budget cycles than a response to when customers are actually switching.
Largely absent from this category — most of the remaining field. Halifax, Chip, First Direct, Monese, and Nationwide show effectively zero current-account-flagged ad activity across the entire six-month window. There's no seasonality strategy to read here because there's no visible activity in this category to begin with.
Zoom out across all 21 brands and the same picture holds: a handful of brands carry most of the visible activity, the rest are either silent or running occasional bursts that don't visibly track the cycle.
Source: Meta Ad Library, scraped Jan–Jun 2026, current-account-flagged ads only. Brands with zero activity in this window still render as flat lines for completeness. Each mini-chart is scaled to its own brand's maximum so low-volume brands remain readable.
So what?
None of the four patterns above look like a brand that has explicitly mapped its media plan to the known CASS seasonal curve. Monzo's front-load is the closest fit, but it peaks in March, months before the actual autumn demand peak, so even that reads more like an internal campaign calendar than a deliberate seasonal play. Zopa and HSBC's lean into May runs directly against the historical trough, which is either a genuinely sharp contrarian bet (cheaper inventory, less competitive noise) or simply coincidental timing from an unrelated campaign.
The bigger takeaway is that almost nobody in this category appears to be running media spend on a switching-seasonality-informed calendar at all. For a brand willing to actually build a plan around the known curve, leaning in ahead of the autumn peak rather than during or after it, there's a real gap between how predictable this market is and how few of its biggest players seem to be planning around that predictability.
Switching volume data: Pay.UK Current Account Switch Service monthly dashboards, 2021–2026, personal accounts only. Ad volume data: Meta Ad Library, scraped via custom pipeline, current-account-flagged ads, January–June 2026.
Further reading: a separate analysis of bank-level CASS switching outcomes (net gains/losses by brand, Q4 2024–Q4 2025) is available as a related appendix.