Welsh Ministers have approved changes to the test that decides whether a short‑term let in Wales sits on business rates or council tax. From 1 April 2026, owners who fall short of the 182‑day letting requirement in the previous year will be able to meet it on a two‑ or three‑year average. Up to 14 days of free breaks donated through a registered charity can also count. The policy reflects proposals the Welsh Government consulted on in August 2025. (gov.wales)

What stays the same matters. Since 1 April 2023, Wales has required self‑catering units to be available to let for at least 252 days and actually let for at least 182 days to remain on non‑domestic rates; the option to average days across multiple units at the same location as one business also continues. Business Wales guidance and the 2022 Order set those rules in black and white. (businesswales.gov.wales)

How the new averaging works in practice: for any assessment day on or after 1 April 2026, if a property wasn’t let for 182 days in the immediately preceding year, it can be treated as if it was-provided the average over the previous two years or, alternatively, the previous three years reaches 182 days. The legislation also labels the year being tested as “year A”, which should make future assessments clearer for owners and billing authorities.

Two quick examples show the intent. A coastal cottage that logged 165 letting days in 2025 and 210 in 2024 averages 188 across two years, so it would remain on non‑domestic rates for 2026/27. A three‑year pattern of 170 days in 2023, 200 in 2024 and 180 in 2025 averages 183-again sufficient. But if the last three years were 150, 160 and 170 days, the 160‑day average would see the property revert to council tax until compliance is re‑established.

There is also a modest allowance for community‑minded operators. Up to 14 days per year where the unit is provided free to beneficiaries under an arrangement with a registered charity can now count towards the totals of days “let” or “available for letting”. Owners should keep the charity agreement, booking records and evidence that the breaks were short‑term. For the avoidance of doubt, this charity allowance applies to lettings beginning on or after 1 April 2026. (gov.wales)

Multi‑unit businesses are not left out. The long‑standing ability to average days across several units on the same site remains, and the government’s consultation material indicates the new multi‑year averaging will also apply where days have been pooled across units. In practice, that lets an operator average across units and over two or three years to assess the 182‑day test-useful for farms with several cottages or holiday parks with multiple cabins. (businesswales.gov.wales)

Timing is important. The averaging change applies where the assessment day falls on or after 1 April 2026. The charity allowance counts only for lettings that begin on or after 1 April 2026. Owners should align booking records to these dates and ensure their systems can export clean evidence by unit for each relevant year.

Cash‑flow context matters too. The same date-1 April 2026-marks the start of Wales’s next business rates revaluation and the introduction of differential multipliers. Ministers have set a standard multiplier of 0.502 for 2026/27 and confirmed a two‑year transitional relief scheme that phases in bill increases at 33% in 2026/27 and 66% in 2027/28 before the full amount in 2028/29. If you’re on the margin between council tax and rates, build these parameters into your scenarios. (gov.wales)

Evidence still decides outcomes. The Valuation Office Agency stresses that “available for letting” turns on genuine commercial intention, so keep listing screenshots, calendars, platform extracts and invoices to show continuous marketing and paid bookings. Good records reduce friction if an assessment is queried. (gov.uk)

What to do now is straightforward. Calculate two‑ and three‑year averages for each unit ahead of 1 April 2026, stress‑test borderline cases, and consider structured charity partnerships within the 14‑day cap. Speak early to your billing authority or adviser if a property risks dipping below 182 days so you understand the point at which council tax would apply.

Why this change? A single‑year test created cliff‑edges after poor seasons or late cancellations. A limited averaging option reduces churn between tax regimes without shifting the 252/182 standards introduced in 2023, which ministers framed as ensuring fair contributions and community benefits. For many small operators, this is a practical fix that stabilises budgets while retaining the higher bar on occupancy. (legislation.gov.uk)

Market Pulse UK view: this isn’t a giveaway. It’s a smoothing tool for businesses that usually meet the bar and a nudge for everyone else to plan, document and trade consistently. If you hit the numbers most years, you now have room for a blip; if you don’t, council tax remains the default.