Buying a self-catering or guest accommodation business in Wales: how the 182-day rule decides business rates or council tax

Contents

1. The rule in one page
2. The four conditions in the order the statute sets them
3. What counts as a let day
4. Reading a booking ledger: nights, midnight and the 28-day cap
5. Three ways to reach 182 days
6. Buying as a going concern: sale, effective dates and the months either side

The rule in one page

Short answer: Wales sets two day counts in the statute, 252 days available and 182 days let, and a failure on either one pushes a self-catering property out of business rates.

When a holiday cottage is sold, the question is whether it is a business, paying business rates, or a home, paying council tax. Wales answers it with numbers written into section 66 of the Local Government Finance Act 1988. The subsection that applies in Wales is (2BB). The English subsection (2B) uses lower numbers and does not apply in Wales (s.66(2AA) and (2BA), Local Government Finance Act 1988).

The numbers rose on 14 June 2022, when the Welsh amending order came into force. The order replaced 140 with 252 and 70 with 182. A transitional article reads the new numbers as 140 and 70 for any assessment day before 1 April 2023, so the higher numbers bite from that date (arts. 1 to 3, SI 2022/563).

Two more changes took effect on 1 April 2026 under the Welsh 2026 Order: averaging of let days over earlier years, and up to 14 charity days (WSI 2026/7). The table below gives the dates so you can place the seller's records against the rule that applied at the time.

Passing once does not carry forward. Welsh guidance says the criteria must be met for each property in each 12-month period (see the Welsh Government guidance page in Sources). The practical result for you: a clean year in the seller's records tells you about the past, and your own booking plan decides the next test.

Read the statute text and the amending orders yourself on legislation.gov.uk, using the numbers in Sources. A sample report shows how a finished purchase check is laid out, so you can see what the checks on a rating entry would sit beside.

The four conditions in the order the statute sets them

Short answer: the statute sets four conditions, each introduced by "each of the following paragraphs", and the property must pass all of them: intention to let, power to let, availability last year, and actual lets last year.

Section 66(2BB) says a building, or a self-contained part of a building, is not domestic property if each listed condition is met. "Not domestic" is what puts the property on the business rates list. The conditions come in four steps, and the table sets them side by side (s.66(2BB)(a) to (d), Local Government Finance Act 1988).

The explanatory note to the 2022 Order describes the same three day counts. The requirement to intend 252 days, the requirement of 252 days of availability in the previous year and the requirement of 182 days of actual lets all rose together (explanatory note, SI 2022/563).

Notice two things. The first condition looks forward, so a buyer's own plan feeds into it. The others look back, so the seller's records feed into them.

Also notice that 252 days of availability leaves room for 113 days a year when the property is not available at all: 365 minus 252 is 113 days. Owner use, maintenance closures, winter shutdowns and personal blocks all draw from that same 113-day allowance. A seller who closes the cottage from 1 November to 31 March uses 151 days and fails the availability test before anyone counts a booking. That is a conclusion from the arithmetic, so check the seller's calendar rather than the listing text.

The 182-day test is separate and tighter in practice. Actual lets of 182 days out of 365 means the property was let on 49.9 per cent of days across the year. Treat any year in the seller's records with fewer than 182 let days as a failed year unless averaging or charity days rescue it, and read three ways to reach 182 days for those.

What counts as a let day

Short answer: a let counts only if it is a short period of 28 days or fewer and a commercial letting at market rates that was actively advertised.

The statute says "short periods" and "commercially". Welsh Government guidance gives the working meaning: a short period is 28 days or fewer, and longer lets do not count toward the criteria (Welsh Government guidance, letting criteria). A three-month winter let at a discount is therefore worth nothing toward 182, however many days it occupies, and the same let might count as availability only if the property was actually offered for short lets in that period.

On "commercially", the guidance says letting must be at market rates and actively advertised. It adds that lets to friends or family at zero or nominal rent generally do not count (Welsh Government guidance, letting criteria). Free nights given to the owner's relatives, staff stays in lieu of pay and heavily discounted regulars are the lines to test in the booking ledger.

You can turn this into three filters to apply to every row of the seller's booking history:

1. Length. Is the stay 28 days or fewer? A stay of 29 days fails the "short period" definition.
2. Price. Was it charged at a price the open market would have paid? A zero-rent or nominal-rent stay generally does not count.
3. Offer. Was the property publicly advertised for those dates?

The third filter is why you ask for the advertising trail, not just the bank statements. A cottage that took repeat bookings by phone from a private list and was never advertised may fail the "actively advertised" part of the guidance even though cash arrived. Ask for listing pages with dates, channel manager exports and the direct-booking site's booking log.

The public side of this check is the rating list entry and the council's own file. Match the booking ledger against those entries, row by row.

Reading a booking ledger: nights, midnight and the 28-day cap

Short answer: count nights, not days on site. A stay ending before midnight does not count for its departure day, so a Friday-to-Sunday booking is two let days, and only stays of 28 days or fewer, at a market price, qualify.

Welsh guidance says each day is judged on the circumstances immediately before midnight, and that a letting ending before midnight does not qualify for that day. Its own example: a let from Friday afternoon to Sunday morning counts Friday and Saturday only, because the whole of Sunday is judged at midnight (Welsh Government guidance, how days are defined). Operators declare their let nights on the Valuation Office form.

For you, the unit in the ledger is the night of stay. A broker who quotes "days occupied" or "weeks booked" may be counting arrival and departure days that the test ignores. Convert every row to nights before you compare it with 182.

The guidance also says the Valuation Office form for self-catering properties in Wales is the application that goes in when a property sits on the council tax list but meets the criteria. A second form, VO6048, is completed only if the Valuation Office asks for it (Welsh Government guidance, information to submit). Ask the seller which form went in and on what date, and ask for a copy of what was submitted.

A ledger worked through to the test

Illustrative figures: one cottage, one year, taken from a seller's booking export. The seller's broker says 244 nights were occupied.

Check the sum: 98 plus 42 plus 16 is 156 certain let nights. Add the 12 phone nights and you reach 168. Add 56, 14 and 6 and the ledger total is 168 plus 76, which is 244, the broker's figure.

The test sees 156 nights, or 168 at best. Both are below 182, by 26 nights or 14 nights. The broker's occupancy of 244 nights overstates the test figure by 88 nights: 244 minus 156 is 88.

Now apply the averaging route (see three ways to reach 182 days). Illustrative figures: the cottage let 192 nights in the year before and 200 in the year before that. Two years give 156 plus 192, which is 348, divided by 2 is 174. Three years give 156 plus 192 plus 200, which is 548, divided by 3, which is 182.67. The cottage passes on a three-year window and fails on a two-year window.

Which window the Valuation Office uses is a matter for the Valuation Office. Ask the seller whether it has accepted the property on a three-year average, and request that letter. The guidance notes other averaging approaches are assessed case by case (Welsh Government guidance, annex 1).

Three ways to reach 182 days

Short answer: a property that lets fewer than 182 days in its latest year can still pass through a group average, a two- or three-year average, or up to 14 charity days, and each route has its own proof.

Section 66(2BB)(d) gives the buyer a first route even before the 2026 changes: counting the property together with other buildings let in the same way. The 2026 Order added two more. Each route needs different records, so treat them separately.

Route one: the group average

The group average lets several buildings be tested together. The days let, taken with the other buildings in the calculation, must average at least 182 days for each building included (s.66(2BB)(d)(ii), Local Government Finance Act 1988). Each building in the calculation must meet three conditions:

• It is not included in another calculation for the same year.
• It is at the same location as, or in very close proximity to, all the other buildings in the calculation.
• It is let as part of the same business or connected businesses (s.66(2BB)(d)(ii)(aa) to (cc), Local Government Finance Act 1988).

Welsh guidance states the same, and adds that the commercial-basis test still applies to each property (Welsh Government guidance, letting criteria). A group average does not excuse a cottage that was never advertised: it is a way to pool days, not to waive the rest.

For a buyer, the condition to check is the one about business structure. If the seller held three cottages through two companies that are not "connected businesses", the group may break apart on your purchase. If you buy only two of the three cottages, the average is recalculated on the buildings you own, which may fail where the seller's three together passed. That is a conclusion from the three conditions, not a quoted rule, so ask the seller for the rating list entries and the calculation they used.

Route two: averaging over earlier years

From 1 April 2026, if the property was not let for at least 182 days in the year immediately before year A, it is treated as let for 182 days if the average days let per year reach 182. The average runs over the two years, or over the three years, immediately preceding the day in question (s.66(2BBA) inserted by WSI 2026/7).

The amendment applies to an assessment day on or after 1 April 2026 (art. 2, WSI 2026/7). It does not rewrite earlier assessment days, so a seller cannot use it to repair a bill that relates to a test day before that date.

Here is how it runs on figures. Illustrative figures: a cottage let for 170 days in its latest year, 200 days the year before and 176 days the year before that.

Check the sum: 170 plus 200 is 370, divided by 2 is 185. 170 plus 200 plus 176 is 546, divided by 3 is 182.

Now change the earlier years. Illustrative figures: latest year 170 days, then 180 days, then 175 days. Two years give 175 and three years give 175, both below 182. The cottage fails on all three windows and moves to council tax. Check the sum: 170 plus 180 is 350, divided by 2 is 175. 170 plus 180 plus 175 is 525, divided by 3 is 175.

The rule says the property "is treated as" let for 182 days if the average reaches 182. It does not change the 252-day availability test. A cottage with strong lets but 240 available days still fails on availability.

For you, the averaging route turns one bad year into a question about three years of ledgers. That is why you want three years of night-by-night records, not a summary figure from the broker.

Route three: up to 14 charity days

From 1 April 2026 up to 14 days count toward the totals in section 66(2BB). The property must be let, or available to let, under an arrangement with a charity registered under section 30 of the Charities Act 2011. The charity's beneficiaries use it free of charge as self-catering accommodation for short periods (s.66(2BBB) inserted by WSI 2026/7). The provision covers lettings on or after 1 April 2026 only (art. 2, WSI 2026/7).

Illustrative figures: a cottage let commercially for 170 days plus 14 charity days reaches 184 and passes. A cottage let for 165 days plus 20 charity days counts only 14 of them and reaches 179, which fails. The limit is "up to 14", so extra days earn nothing.

Charity days before 1 April 2026 count for nothing, so a seller's 2025 record of donated breaks is not evidence for this route. Ask for the written arrangement with the charity, the charity's registration number and the dates the beneficiaries stayed.

Buying as a going concern: sale, effective dates and the months either side

Short answer: a property sold as a going concern stays on the business rates list if the 252-day and 182-day conditions were met in the 12 months before and after the sale. A sale to someone who plans domestic use, or a gap in trading, moves it to council tax.

Welsh guidance lists the usual reasons a property is treated as domestic and listed for council tax. They are sale to a new owner who plans domestic use, private occupation, fewer than 252 available days in the past year, no plan to make it available for 252 days in the coming year, fewer than 182 let days (with no averaging rescue), and the business ceasing to trade (Welsh Government guidance, ceasing to be self-catering).

The same passage says a property sold as a going concern stays non-domestic where the 252-day and 182-day conditions were met in the 12 months before and after the sale. Two of those reasons attach to the sale itself, so a completion date is a rating event.

Your first 12 months are tested too

The sale rule has a forward half. The statute's first condition asks what the owner intends for the 12 months after the assessment day (s.66(2BB)(a), Local Government Finance Act 1988). The guidance repeats the point in its list of reasons: an operator who does not plan to make the property available for 252 days in the coming year falls out.

Your plan matters from completion day. A buyer who closes the cottage from 1 November to 31 March for a refit draws 151 days from the 113-day allowance (the four conditions explain the allowance) before any guest books. Add a three-week family holiday of 21 days and the total is 172 days, which is 59 more than the allowance: 172 minus 113 is 59. The unit then cannot reach 252 available days in that year.

That is a conclusion from the numbers. The practical step is to build the first year's availability calendar before you offer, mark every block, and check that the unblocked days reach 252 with some margin.

The effective date when a property comes back to business rates

If a property sits in a council tax band and later meets the criteria, the guidance sets the effective date as the later of two dates: the date it reached 252 days of commercial availability, and the date it reached 182 days of letting in the previous 12 months. That assumes it will continue to be commercially available for 252 days in the following 12 months. If not, it stays in the council tax band (Welsh Government guidance, effective date).

Illustrative figures: a buyer completes on 1 March and opens the cottage for commercial booking at once. The cottage has been banded for council tax under the seller. Counting 1 March as day 1, there are 245 days to 31 October, so the 252nd available day is 7 November: 245 plus 7 is 252.

The let date depends on bookings. At 60 per cent of nights let, 182 let nights take about 303 days, which is late December: 182 divided by 0.6 is 303.3. The effective date is the later of the two, so late December. Until then the property carries council tax, with any premium the council has set. A slow first summer pushes the let date later and the move to business rates with it.

Ask for the dates on which the seller's own units last changed list. If a unit changed list in the past three years, the date shows which of the two conditions was the slower one.

Telling the Valuation Office, and the backdated bill

The guidance says owners can notify the Valuation Office of a change rather than wait for a reassessment. Otherwise they may receive a backdated council tax bill (Welsh Government guidance, ceasing to be self-catering). Its FAQ adds that reassessment can happen at any time, can reach past years, and can follow a change of circumstances or use. The Valuation Office will not list a property for council tax for periods before 1 April 2023 unless it failed the earlier criteria of 140 days available and 70 days let (Welsh Government guidance, annex 2 question 3).

That final sentence gives you a cut-off to apply to the seller's history. The numbers attach to the assessment day: an assessment day before 1 April 2023 reads 140 and 70, and an assessment day from that date reads 252 and 182 (art. 3(1), SI 2022/563). A year that ended before April 2023 is therefore not safely tested at 70.

Illustrative figures: a seller's cottage let for 160 days in the year to March 2023 and 150 days in the year to March 2024. The 2023 year would clear 70 by 90 days (160 minus 70), but that comparison only helps if the assessment day fell before 1 April 2023. An assessment day on or after that date looks back at the year ending then and applies 182. The 2024 year fails the current 182-day test by 32 days: 182 minus 150 is 32. A backdated bill, if one comes, could therefore start from the later year and not from the earlier one.

Sources

1. Welsh Government, Business Wales, non-domestic rates for self-catering properties in Wales. https://businesswales.gov.wales/non-domestic-rates-self-catering-properties-wales (retrieved 2026-11-06)
2. Local Government Finance Act 1988, section 66. https://www.legislation.gov.uk/ukpga/1988/41/section/66 (retrieved 2026-11-06)
3. The Non-Domestic Rating (Amendment of Definition of Domestic Property) (Wales) Order 2022, SI 2022/563. https://www.legislation.gov.uk/uksi/2022/563/made (retrieved 2026-11-06)
4. The Non-Domestic Rating (Amendment of Definition of Domestic Property) (Wales) Order 2026, WSI 2026/7. https://www.legislation.gov.uk/wsi/2026/7/made (retrieved 2026-11-06)