You never have to tell your employer you're disabled, but it's best to disclose in writing as soon as you need a workplace adjustment: your Equality Act 2010 rights only fully apply once the employer knows. The timing is your choice, but the legal protection is not free-floating — it switches on when your employer knows, or could reasonably be expected to know, that you're disabled. So the safe move is to speak up before your condition starts affecting your work, not after.
Tell someone who can act on it, in writing
Disclose to whoever can actually do something with it — usually your line manager or HR, and occupational health if your needs are more complex. Put it in writing (an email is fine) so there is a dated record of what you said and when. You don't have to name a diagnosis: you can disclose "a condition" or "a health issue" and still trigger your employer's duties. A formal diagnosis isn't required for the law to apply either — under the Equality Act you're disabled if a physical or mental impairment has a substantial and long-term effect on your everyday activities (Equality Act 2010, section 6). In your message, say what gets in the way at work and what reasonable adjustments you think would help.
Good moments to disclose
There is no single right time, but these are the natural ones:
- At application, if you need adjustments for the interview itself (extra time, questions in advance, a quieter room).
- When you accept a job offer, so support can be in place before you start.
- When you start, as part of induction.
- When something changes — a new or worsening condition, or a new role that creates fresh barriers.
Telling your employer once you've been offered or started a job also makes it easier to spot if you're later treated unfairly, because the disclosure is on record.
Why writing it down matters
Once your employer knows, it has a legal duty to support you, including making reasonable adjustments (Equality Act 2010, section 20). That duty can even apply where you haven't formally told them — if the circumstances, such as repeated sickness absence or obvious changes, mean they could reasonably be expected to know. But relying on that is risky. The Act gives your employer a defence where it neither knew nor could reasonably have been expected to know you were disabled (Equality Act 2010, Schedule 8). A clear written disclosure closes that gap and is what actually secures your protection. The Equality Act covers England, Scotland and Wales; in Northern Ireland the equivalent law is the Disability Discrimination Act 1995.
Where the law comes from
Related
This page is general information, not clinical or legal advice.