The 182-day rule is the test a Welsh holiday let has had to pass since 1 April 2023 to be charged business rates instead of council tax: it must have been available to let for at least 252 days in the previous 12 months and actually let for at least 182 of them. Miss either number and the property is treated as a second home for council tax, where Welsh councils can charge a premium of up to 300% on top of the standard bill.
The detail
Before April 2023 the thresholds were 140 days available and 70 days let, the same as England still uses. The Welsh Government raised them specifically to stop lightly-used second homes claiming business rates — and small business rate relief, which usually meant paying nothing at all — while contributing nothing to the local council. The 182-let-nights figure is high: it is 50% occupancy across the whole year, which coastal markets such as Pembrokeshire and Gwynedd hit only with strong shoulder-season demand and active pricing.
The consequence of failing is not just moving to council tax. Since April 2023 Welsh councils have been able to charge a council tax premium of up to 300% on second homes and long-term empty properties, and several of the strongest holiday-let counties use it. A property with a £2,400 standard bill can therefore face £9,600 a year in the year it drops below 182 nights, with no retrospective relief if it recovers the following year. The test is applied on the trailing 12 months. Since 1 April 2026 a property that misses 182 in a single year can instead be assessed on its average over the previous 24 or 36 months, and up to 14 nights a year donated to charity count towards the total, which takes some of the cliff edge out of one bad season — but not out of a property that never gets near the number.
Two further Welsh rules sit alongside it. Councils can require planning permission to change a dwelling into a short-term let through an Article 4 direction under the use classes introduced in October 2022, and Gwynedd has done so from 1 September 2024, outside the Eryri National Park. And the Visitor Accommodation (Register and Levy) Etc. (Wales) Act 2025 creates a national register of visitor accommodation and lets councils introduce a per-night visitor levy no earlier than April 2027 — a cost to model rather than a ban, but one more line on the sheet.
The numbers that matter
Where this stops holding
This is a local-tax rule, not a licensing one, and it applies only in Wales: England still uses 140 available and 70 let, and Scotland's licensing scheme sits on top of a separate council-tax test. Whether a given council levies the premium, and at what rate, is a local decision that changes at each budget — check the council's own page before assuming either the best or the worst case.
Sources
- GOV.UK — business rates for self-catering and holiday let accommodation (Wales criteria and the 2026 averaging rule)
- Welsh Government — council tax on empty and second homes (premiums up to 300%)
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