Most London short lets are charged council tax exactly like any other home, because council tax is based on a property being a dwelling, not on who is staying in it. A property only moves onto business rates once it is being run as a self-catering letting business in a way that meets a set of usage tests, based on how many days a year it is available to let and how many days it is actually let. Occasional short lets, or a flat used partly by the owner, almost never meet that bar and stay on council tax.
Why council tax is the default
Council tax is charged on domestic property. A flat that is someone's home, or that sits empty between occasional bookings, is still a dwelling in the ordinary sense, and the local authority has no reason to treat it differently because some of its nights were sold to guests rather than lived in by an owner. Letting a spare room while you live there, or letting the whole place for a scattering of nights across the year, does not change what the property fundamentally is.
This means the overwhelming majority of London hosts, including most who let within the 90-night limit, are simply council tax payers with a letting income on the side. Nothing about listing on Airbnb or Booking.com moves you off council tax by itself.
What actually triggers the move to business rates
The switch happens when a property meets specific tests set nationally, based on how many days in the year it is available to let commercially and how many days it is actually let. These are usage-based thresholds, assessed year to year, not a one-off decision. A property that clears both thresholds is treated as a self-catering holiday letting for rating purposes rather than a dwelling, and it moves from council tax onto business rates, with its rateable value set by the Valuation Office Agency rather than a council tax band.
The exact day counts are set nationally and have been adjusted before, so we are not going to state a figure here that might be wrong by the time you read it. What matters for planning purposes is the shape of the rule: it rewards genuine occupancy across most of the year, not a handful of high-value bookings. A flat let out for a few peak weeks around major events, sitting empty the rest of the time, is unlikely to meet the threshold even at a high nightly rate. A flat run close to the 90-night limit, and available for booking well beyond that even if it does not all sell, is far more likely to be assessed against it. Check the current day thresholds directly on GOV.UK or with the Valuation Office Agency before assuming which side of the line a property sits.
Business rates are not automatically the worse outcome
It sounds like a downgrade, but it often is not. Business rates on a single self-catering property are frequently eligible for small business rates relief, which can reduce the bill substantially depending on the property's rateable value. Plenty of hosts who move onto business rates end up paying less than they would have on council tax for the same property, particularly where the flat's council tax band was high relative to its rateable value as a holiday letting.
The reverse is also possible. A high-value London property with a correspondingly high rateable value, or one that does not qualify for relief, can end up paying more. This is not a rule you can generalise from a neighbour's experience. It depends on the specific rateable value the Valuation Office Agency sets, and that is worked out property by property.
What actually happens when a property switches
The Valuation Office Agency assesses the property and gives it a rateable value, which replaces its council tax band for as long as it continues to meet the usage tests. The local council then bills business rates on that value rather than council tax, and any relief is applied by the council once you have told them the property qualifies and asked for it. It is not automatic. If usage drops in a later year and the property no longer meets the thresholds, it can move back onto council tax, though this generally needs reporting rather than happening by itself.
None of this is triggered by Airbnb, by the council noticing a listing, or by the 90-night planning limit, which is an entirely separate system covering land use rather than tax. A property can be well within its 90 nights and still meet the business rates usage tests, because the two thresholds are not the same and do not need to be.
What to actually do
If a property is being run close to full-time as a short let, available for booking most of the year rather than for a handful of weeks, it is worth checking its position against the current thresholds rather than assuming council tax still applies by default. The Valuation Office Agency and GOV.UK set out the current tests and how to notify them if a property meets them. If it is likely to qualify, ask about small business rates relief at the same time, since it is not applied automatically.
If you are not sure which side of the line a property falls on, an accountant or the Valuation Office Agency directly can confirm it against the actual booking pattern, which is the only way to get a reliable answer.
If you want to know what a property is actually likely to earn and how often it would need to be let to matter for this, send us the postcode and we will give you a straight answer on the letting side of it.
This is general information about how the council tax and business rates boundary works, not tax advice. The day thresholds and relief schemes are set nationally and can change. Confirm the current position with the Valuation Office Agency or GOV.UK, and speak to an accountant about your own property before relying on it.