The 100% Council Tax Premium on English Second Homes: The Arithmetic That Now Forces Every STL Owner to Choose
By STL Accounting and Finance
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In short: From April 2025 English councils gained the power to charge 100% council tax premiums on furnished second homes. Hamptons' December 2025 tracker showed 211 of 296 English billing authorities had already switched it on, with 38 more confirmed for April 2026 — around 84% of England. For STL owners in an activated area the choice is now stark: hit the 70-let / 140-available business rates thresholds, or absorb double council tax.
The Levelling Up and Regeneration Act 2023 handed English councils a new discretionary power: to charge a 100% council tax premium on properties that are furnished but not used as anyone's sole or main residence. That power went live for the 2025/26 billing year, and councils have adopted it faster than anyone expected.
Where the map now sits
According to Hamptons' December 2025 release, 211 of the 296 English billing authorities switched the premium on for the 2025/26 year. A further 38 confirmed for April 2026, taking coverage to roughly 84% of England by the time the 2026/27 tax year is running. The councils that have not yet adopted are, as a rule, either finalising the decision or are urban authorities with few second homes to target — meaning the operators who are exposed are the ones in exactly the areas STLs cluster.
For a Band D property (typical council tax around £2,300 in England for 2026/27), the premium adds roughly the same amount again — an additional £2,000-£2,500 per year, per property, on top of whatever the operator was paying.
The business rates escape valve
The classic route out of the premium for STL operators has always been the same: get the property assessed as non-domestic (self-catering accommodation) and pay business rates instead of council tax.
For an English property to move to the non-domestic rating list as a self-catering property, since the April 2023 rule tightening, it must be:
- Available to let for at least 140 days in the previous and following 12 months, and
- Actually let for at least 70 days in the previous 12 months.
Meet both, and the Valuation Office Agency reassesses the property onto the non-domestic list. Miss either, and it stays on the council tax list — with the premium applied where the council has activated it.
The arithmetic operators need to run
For each affected property, the numbers are now specific and finite:
- Council tax band and 2026/27 headline bill for the property.
- Plus 100% premium if the council has activated it (check the specific billing authority's stance for 2026/27, not the 2025/26 position).
- Compare against the rateable value on the non-domestic list plus any Small Business Rate Relief that would apply. In England, properties with a rateable value under £12,000 currently get 100% relief; £12,001-£15,000 tapered.
For a small English self-catering unit that would qualify for SBRR at 100%, moving from council tax + premium (say £4,600) to business rates + SBRR (potentially £0) is a five-figure saving over a five-year holding period. The operational commitment (70 lets, 140 days availability) is real, but for a business already running as an STL it is not usually additional work — it is documentation of work already being done.
What operators should not do
Do not assume the previous year's position holds. Councils are activating the premium on a rolling basis. A property that was safe on council tax in 2024/25 may be exposed for 2026/27.
Do not attempt to switch mid-year without evidence. The VOA requires evidence of the actual letting activity over the qualifying period. Retrofitting a claim without documented booking evidence is a bad idea.
Do not overlook the interaction with planning permission. Moving to business rates flags the property as being in commercial short-let use. Where the property does not have planning permission or a Certificate of Lawfulness for that use, the change in rating can prompt a planning-enforcement review by the same council. Our sister firm STL Solutions covers this dimension separately.
What operators should do
- Check your billing authority's premium status for 2026/27. Do not rely on 2025/26.
- Run the arithmetic for each property. Business rates + SBRR versus council tax + premium.
- Where business rates wins, document your letting activity now. The 70/140 thresholds need contemporaneous evidence — booking calendars, platform statements, availability records.
- Where planning position is uncertain, address it before switching rating. The two questions are connected.
For most STL owners in England, the premium arriving alongside the FHL abolition has been a two-punch year on tax. The council tax premium is the punch you can still choose whether to take.
Book a free consultation to model the numbers for your specific properties.
Sources: Hamptons via Latch — Second Homes Council Tax Premium 2026 tracker; CalcHub — UK Council Tax Premium on Second Homes 2026; HomeOwners Alliance — Second home council tax.
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