The £400,000 Rates Cap in Northern Ireland: What It Means for Your Bill

How the Cap Works

Northern Ireland applies a statutory cap on the capital value used to calculate domestic rates. No property is charged rates on more than £400,000 of capital value, regardless of what the actual assessment says.

The distinction matters:

• Assessed capital value — the true valuation LPS assigns to the property as of 1 January 2005
• Chargeable capital value — the figure used in the rates calculation. If the assessed value is at or below £400,000, the chargeable value equals the assessed value. If it exceeds £400,000, the chargeable value is capped at exactly £400,000.

A property assessed at £600,000 pays the same rates bill as one assessed at £400,000 — the excess £200,000 is disregarded.

Why This Matters Before You Challenge

The cap creates a practical trap for high-value property owners considering a valuation challenge.

If your property is assessed at £480,000 and you successfully reduce it to £420,000, your chargeable value stays at £400,000. Your rates bill doesn't change by a single penny. You've gone through the review process — including the risk of an upward revision — for zero financial benefit.

For a challenge to produce real savings on a property valued above £400,000, the reduction must bring the assessed capital value below £400,000. A drop from £450,000 to £350,000 would reduce the chargeable value from £400,000 to £350,000, generating a real bill reduction.

Before filing Form CR3, check your capital value on the LPS Valuation Search. If it's well above £400,000, calculate how much reduction you'd realistically need before the cap even comes into play.

The Numbers for 2026/27

To see what the cap means in practice, here's the maximum annual rates bill for a property at the cap in three different council areas during 2026/27:

The variation comes entirely from differences in district rate poundage — Derry's district rate is nearly 70% higher than Lisburn's — not from valuation differences.

Planned Reforms

The Department of Finance has published policy roadmaps outlining planned structural changes to the domestic rates system. These include raising the capital value cap from £400,000 to £485,000 and reducing the Early Payment Discount from 4% to 2%.

These reforms haven't been implemented as of the 2026/27 rating year. If and when the cap rises to £485,000, properties currently assessed between £400,001 and £485,000 would see their chargeable value increase — meaning higher bills for those homeowners without any change to their assessed capital value.

Who the Cap Helps (and Doesn't)

The cap benefits owners of the highest-value properties, effectively providing a rates discount that grows with property value. A home assessed at £800,000 pays the same as one at £400,000 — a substantial saving.

For most Northern Ireland homeowners, the cap is irrelevant. The median domestic capital value in Northern Ireland sits well below £400,000, so the assessed and chargeable values are identical.

If you're considering a challenge and your property sits near the cap, our valuation challenge guide includes a refund calculation worksheet that accounts for the cap — so you can see the actual financial impact before deciding whether to proceed.

See more Northern Ireland guides →