Undiagnosed dyslexia still triggers your employer's legal duty.

ACAS updated its guidance on neurodiversity at work in January 2025. The key line for anyone working without a formal assessment: "A worker does not need a diagnosis to be considered disabled under the Equality Act 2010." If you've been managing quietly for years, re-reading emails twice more before sending, assuming there's no legal basis to ask your employer for support, that sentence has your answer.

Your employer's duty to make reasonable adjustments is triggered when they know, or ought reasonably to know, that you're struggling because of a disability. A direct conversation about your difficulties, in many cases, is enough to start the clock.

The myth and what the law actually says

The belief is widespread: without a formal diagnosis, you have no legal footing. Many employees accept this as fact and either wait months for an assessment or quietly conclude that no assessment means no rights.

The Equality Act 2010 works differently. Section 6 defines disability as "a physical or mental impairment that has a substantial and long-term adverse effect on the ability to carry out normal day-to-day activities." There is no diagnosis requirement anywhere in that definition. The test is entirely functional: what your dyslexia does to your working life, and whether it substantially affects your day-to-day activities.

Re-reading every email three times before sending it is unpaid work. The masking cost calculator puts a number on it: enter your salary and your daily workarounds, and it shows you what that time costs per year. Whether or not you have a formal diagnosis, the impact is real, and the law is written to cover it.

If dyslexia is substantially affecting your ability to do your job, you are likely within the scope of the Equality Act 2010, with or without formal paperwork.

What "ought reasonably to know" means for you

The employer's duty to make reasonable adjustments is triggered when they know, or "ought reasonably to know," that a worker has a disability. That phrase carries real weight for undiagnosed dyslexic employees.

If you tell your manager that reading documents at speed is difficult, or that you need more time to process written information, that conversation puts your employer on notice. They cannot later claim ignorance. The ACAS guidance confirms this directly: employers should offer support "whether or not they have a diagnosis for their neurodivergence."

The practical implication: what your employer needs to hear is a description of the functional impact at work, for example: "Reading dense documents under time pressure slows me down considerably and I make more errors as a result." You do not need to name dyslexia specifically to put your employer on notice, though naming it is usually clearer.

Describing your difficulties at work in writing, even informally, may be enough to trigger your employer's legal duty. You do not have to wait for paperwork.

How to ask for adjustments without a diagnosis

The barrier at this stage is usually practical: knowing what to say, and to whom. Most dyslexic employees who haven't been assessed never ask for adjustments. The block is usually knowing how to frame the request. The reasonable adjustments builder turns your specific challenges into a conversation plan and a draft email, in about two minutes. You can use it before any formal assessment.

The request is about your experience at work: the specific tasks that take you significantly longer, and the adjustments you think would help. Your employer then has a duty to consider those requests in good faith and explore what is reasonable.

Keep a written record of any conversation about adjustments, including informal ones. An email to yourself summarising what was said, and when, is sufficient. If things escalate later, that paper trail is what matters, not a formal meeting or HR form.

You can put in an adjustments request this week. Use the adjustments builder, send it to HR in writing, and keep a copy of everything you send and receive.

If your employer says you need a diagnosis first

Some employers respond to adjustments requests with a version of: "We need a formal diagnosis before we can act." This is a common response. Under current guidance, it is not a legally sound one.

ACAS guidance (January 2025) states that while an employer can ask for proof of a condition, a worker "is not legally required to provide this" and "might not have any proof they can give." The guidance is explicit that employers should offer support whether or not a diagnosis exists. Using the absence of paperwork as a reason to delay all support can itself constitute a failure to make reasonable adjustments under the Equality Act 2010.

What to do: point your employer to acas.org.uk/reasonable-adjustments/adjustments-for-neurodiversity. If they continue to refuse any engagement at all, contact ACAS (0300 123 1100) to begin early conciliation. That is the step before any Employment Tribunal claim, and it is free.

If your employer cites the absence of a diagnosis as a reason to do nothing, send them the ACAS link in writing. Document the refusal. If they still refuse, ACAS early conciliation is the next step.

The US position: similar principle, one extra step

Under the Americans with Disabilities Act 1990, as broadened by the 2008 amendments (ADAAA), dyslexia qualifies as a disability in most workplace contexts. The underlying principle mirrors the UK approach: the test is functional. What your dyslexia does to your working life is what matters.

The key difference in the US: employers have somewhat stronger rights to request documentation before providing accommodations. The Job Accommodation Network (JAN, askjan.org) confirms that employers can request "reasonable documentation" of a disability and its functional limitations. That documentation does not need to be a formal neuropsychological evaluation. A letter from a treating physician or GP describing your functional limitations is generally sufficient.

Telling HR in writing that you have dyslexia and that specific tasks take you significantly longer starts the ADA's "interactive process," which requires your employer to engage in good faith. They can request documentation. They cannot simply ignore your request or wait indefinitely without engaging.

In the US, describe your functional limitations in writing to HR and request the interactive process. If asked for documentation, a letter from your GP is a reasonable starting point before pursuing a formal assessment.

A formal assessment is still worth pursuing

An assessment changes what is available to you, even though it is not required to start the process.

In the UK, Access to Work can fund up to £69,260 per year in support, covering assistive technology and specialist support, including workplace needs assessments. Only 1 in 10 dyslexic employees eligible for that funding have ever applied (British Dyslexia Association, 2024). A formal assessment, or a funded workplace needs assessment, strengthens an Access to Work application considerably. The Access to Work calculator shows you what you could claim based on your role and the support you need.

An assessment also makes your employer's duty harder to dismiss. A request backed by a written report carries more weight than one based on self-identification alone, particularly with a reluctant manager. If you're weighing up cost and timing, the dyslexia assessment cost guide covers what you'd pay in 2026 (£690 to £882 via BDA assessors, as of June 2026) and when Access to Work covers the cost.

The diagnosis conversation is separate and worth having, on your own timeline. Access to Work funding and a stronger paper trail are both waiting for you on the other side of that assessment. Your right to ask for adjustments exists either way.

Get assessed when you're ready. In the meantime, you have rights now. Don't wait for the report to start the conversation.

The call: what to do this week

If you suspect dyslexia but haven't been assessed, here is the clear recommendation: describe the specific tasks that take you significantly longer or cause substantially more difficulty, put that description in writing, and send it to HR or your line manager. The adjustments builder helps you turn your experience into clear language your employer can act on.

Your employer can ask for proof of your condition. Under ACAS guidance updated in January 2025, you are not legally required to provide it. If they refuse to engage at all, that refusal is their legal problem. ACAS early conciliation is free and is the right next step before any formal claim.

You don't need to wait for an assessment to find out what you can ask for. The disclosure decision guide helps you work through the timing question: who to tell and when.

The diagnosis question is separate. It matters, and it's worth pursuing. The right to reasonable adjustments at work exists independently of the assessment report. You already have it.