NHS London Weighting Explained: How It Affects Your Take Home Pay

By Sadeem · Last updated: 2 August 2026

What Is NHS London Weighting (HCAS)?

If you work for the NHS in or around London, you are entitled to an additional payment on top of your standard Agenda for Change (AfC) salary. Officially known as the High Cost Area Supplement (HCAS), this is what most people still refer to as NHS London weighting. The supplement exists to help NHS staff cope with the significantly higher cost of living in and around the capital, covering everything from housing to commuting costs. Understanding exactly how HCAS affects your NHS take home pay in London is essential for budgeting and financial planning.

The supplement is divided into three geographic zones, each with a different annual payment added directly on top of your national AfC band salary. Whether you work in a central London hospital or in a town on the commuter belt, you will fall into one of these three categories.

The Three NHS London Weighting Zones

Your HCAS entitlement depends entirely on where your workplace is located, not where you live. Unlike a flat cash bonus, HCAS is calculated as a percentage of your basic salary, subject to a minimum and maximum cash value. The three zones and their 2026/27 rates are:

• Inner London: 20% of basic salary, minimum £5,794, maximum £8,746 per year
• Outer London: 15% of basic salary, minimum £4,870, maximum £6,137 per year
• Fringe Zone: 5% of basic salary, minimum £1,346, maximum £2,270 per year

Because it is percentage-based with a cap, HCAS is worth more in cash terms to higher-banded staff, up to the maximum. Inner London covers the central boroughs such as Westminster, Camden, Islington, Tower Hamlets, and Southwark. Outer London includes boroughs like Croydon, Ealing, Barnet, and Bexley. The Fringe zone extends into areas just outside Greater London, including parts of Surrey, Essex, Hertfordshire, and Kent that fall within the designated high cost area boundary.

It is worth noting that HCAS does not change your AfC pay band or spine point — it simply sits alongside your salary as a separate supplement, and both elements are subject to income tax, National Insurance, and pension contributions.

How NHS Inner London Weighting Affects Your Pay: A Band 5 Example

Let's take a concrete example to see how NHS Inner London weighting changes your actual pay packet. A newly qualified Band 5 nurse or allied health professional starts at the entry point of £32,073 per year under the national AfC scale. Inner London HCAS is 20% of this, which is £6,415 — within the £5,794 to £8,746 range, so it applies in full. Your total gross salary becomes £38,488 per year, or approximately £3,207 per month before deductions.

Here is how that monthly gross breaks down into your actual take home pay. At this total gross, National Insurance is charged at 8% throughout, income tax at the basic 20% rate, and the NHS pension tier rises to 9.8% because the higher combined gross (salary plus HCAS) pushes you into that pensionable pay band.

Compared to the same Band 5 role outside a high cost area (around £1,996 take home per month), Inner London HCAS adds roughly £292 per month to take home pay after tax, NI and the higher pension tier are accounted for — a meaningful but more modest uplift than the headline supplement suggests, since HCAS is itself taxed and pensioned like ordinary salary. If you also work unsocial hours in a high cost area, see our unsocial hours pay guide for how those enhancements stack on top.