I posted a bit about this before over here:
Monzo can quite easily ignore a marginal increase in interest rates for Plus/Premium (although I wish they wouldn’t - could @AlanDoe invoke someone from the Paid team to give us their thoughts? ) but as the rates increase above that, it might make more (short term) financial sense for Monzo to attract more folk to the free account (or create a third “paid for” tier that doesn’t pay interest but gives you the software features for a nominal monthly payment). Long term, it probably makes more sense to increase interest rates on Plus/Premium, even to the point where the customer can make money out of the account (or get it practicality for free). That way, you’ve got a set of sticky accounts that will maintain revenue when the cycle resets…
Edit: I’ll do some proper modelling later (maybe) but some rough sums show:
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Monzo would need to pay an interest rate of 3% for Plus to be free to the customer (assuming they kept the whole £2k in the account)
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This changes to a whopping 9% for Premium.
The former feels like it might be possible. The latter not so much (eyes his hat nervously).