England has confirmed a new 50.8p high-value business rates multiplier for 2026–27, effective from 1 April 2026. It applies to properties with a rateable value of £500,000 or more and sits 2.8p above the standard 48.0p rate set for the same year, according to HM Treasury’s published tables. (gov.uk)

For firms caught by the threshold, think of this as a simple supplement: 2.8p per pound of rateable value. On the numbers, a £500,000 RV site pays £14,000 more a year under the high-value rate; £1 million RV adds £28,000; £5 million adds £140,000. Councils including Westminster have briefed the same thresholds and values ahead of April. (westminster.gov.uk)

The legal footing comes from the Non‑Domestic Rating (Multipliers and Private Schools) Act 2025, which inserted new powers allowing the Treasury to set extra multipliers up to 0.1 above the main rate. The Treasury’s regulation for England uses those powers to fix the high‑value rate 2.8p above the standard multiplier. (legislation.gov.uk)

For readers outside Whitehall, ‘B’ in the regulation is the base multiplier defined in the 1988 Act’s charging schedules for occupied, unoccupied and central‑list calculations. The Act now permits different calculations for those cases, which is why official notices reference Schedules 4ZA, 4ZB and 5A. (legislation.gov.uk)

There is also a carve‑out for special authorities. In practice this means the City of London, the only authority that meets the statutory test in section 144(6). The high‑value approach applies there too, with the underlying ‘B’ definition adjusted to fit the legislation. (legislation.gov.uk)

The high‑value rate arrives alongside two lower multipliers for retail, hospitality and leisure properties: 38.2p for small RHL sites and 43.0p for standard RHL. These replace the temporary relief and are awarded based on use rather than ownership or chain size, per HM Treasury guidance. (gov.uk)

Costs land at the same time as fresh valuations. The Valuation Office Agency published draft 2026 rateable values on 26 November 2025, with revaluation taking effect from 1 April 2026. Finance teams should verify entries via the VOA’s services before bills are issued. (angliarevenues.gov.uk)

For planning, a quick rule works: the high‑value supplement equals roughly 2.8% of rateable value per qualifying hereditament. Use that to refresh 2026–27 budgets, pressure‑test rent reviews that pass through rates, and revisit head office, warehouse or data‑centre footprints that sit near the £500,000 threshold.

Operationally, the usual mechanics remain. Expect standard instalment profiles, empty‑rates rules unchanged, and central‑list occupiers seeing the same 2.8p step‑up embedded in their multiplier calculations. The legislation allows different ‘B’ values for occupied, unoccupied and central‑list cases, but the high‑value supplement is consistent. (legislation.gov.uk)

A process note to close: the statutory instrument states no separate impact assessment, reflecting that this amends an existing local tax regime. For large warehouses, data centres, airports, flagship retail and trophy offices, the takeaway is straightforward-assume £28,000 extra for every £1 million of rateable value and check whether any sites should sit on the new RHL multipliers instead. (gov.uk)