Mild or severe? Your employer's grading has no legal weight

Severity grading from a dyslexia assessment has no legal definition under the Equality Act 2010. The Act's test is "substantial and long-term," not "severe," and "substantial" means more than minor or trivial. Most dyslexic employees clear that bar.

If your employer told you your "mild" assessment means no adjustments are required, they've confused two different classification systems that were never designed to talk to each other.

This is the most common employer defence after disclosure. It's also wrong, and it fails in tribunals. Understanding why will help you push back with confidence, whether you're at the adjustment request stage or already in a dispute.

What the Equality Act 2010 actually says

The definition of disability in the Equality Act 2010 is set out in Section 6. A person has a disability if they have a physical or mental impairment that has a substantial and long-term adverse effect on their ability to carry out normal day-to-day activities.

Two words do the legal work here: "substantial" and "long-term." Schedule 1 to the Act and the Equality and Human Rights Commission's statutory code of practice both confirm that "substantial" means more than minor or trivial. Long-term means 12 months or more, or likely to last 12 months.

There is no severity tier in the definition. No threshold marked "mild," "moderate," or "severe." The test is binary: either your condition has a more-than-trivial effect on a day-to-day activity, or it doesn't.

Dyslexia, by its nature, affects reading, writing, information processing, and working memory. These are day-to-day activities. The threshold is a low bar, deliberately so.

A 2025 Employment Appeal Tribunal ruling in Stedman v Haven Leisure Limited confirmed that tribunals must not balance activities a person can do against those they cannot. If the condition has a substantial effect on even one day-to-day activity, the disability definition is met. One task, done harder than it should be, is enough.

If your dyslexia makes it harder to read documents accurately, process written instructions, or produce written work at the speed expected, you almost certainly meet the legal definition. Your assessment grade doesn't change that calculation.

Where severity grades come from, and what they're for

When an educational psychologist or specialist assessor gives you a severity label, they're comparing your performance on standardised tests to a general population sample. "Mild" usually means your scores fall in the lower-average range relative to the general population. "Severe" means your scores are in the lowest percentile bands.

These grades exist for clinical and educational planning: they help assessors design appropriate support and help schools or universities calibrate reasonable adjustments for academic settings. They were not designed as a legal classification, and they have no connection to the Equality Act 2010 framework.

An assessor who grades your dyslexia as "mild" is telling you something about your phonological processing speed relative to the general population. They are not making a legal determination about whether your employer is required to act. Those are different questions, answered by different frameworks, and conflating them is a mistake.

The same pattern holds in US law. The ADA Amendments Act of 2008 (ADAAA) explicitly rejected the narrow interpretation of "substantially limits" that courts had been applying. Congress reset the standard to cover conditions that have any substantial limitation on a major life activity, including reading.

Under the ADAAA, dyslexia nearly always qualifies, regardless of what an assessor's severity label says.

The next time an employer cites your severity grade, ask them to point to where that word appears in the Equality Act 2010. It doesn't. The conversation usually ends there.

The coping strategies trap

There's a second version of the employer argument that's worth knowing about. Sometimes the reasoning goes: "Your assessment says mild dyslexia, and you seem to be managing fine, so no adjustments are needed." This conflates two separate things: your functional performance and the effort it takes to achieve it.

The Equality Act 2010 specifically addresses this. Schedule 1 states that where an impairment has a substantial adverse effect when someone does not use a measure to cope with it, the effect is to be taken as substantial. In plain terms: the law looks at what it's like to do a task without your workarounds, not what you manage to produce when you've triple-checked, re-read, and compensated for three hours.

An important Employment Appeal Tribunal case, Paterson v Commissioner of Police of the Metropolis [2007], confirmed this principle. Mr Paterson's dyslexia was only apparent under timed conditions (a promotion exam). The EAT found he was still disabled within the meaning of the Act, because the test is the effect without coping strategies, not the apparent outcome with them.

Producing polished work is not evidence that adjustments aren't needed. It's often evidence of exactly the opposite: the extra time and energy required to compensate is the impairment. The masking cost calculator puts a number on this: enter your salary and your workarounds, and it shows what that hidden effort costs per year.

If your manager or HR points to your output quality as evidence you don't need adjustments, explain the coping strategies the law requires them to discount. The Schedule 1 provision is the right reference.

What employment tribunals actually examine

In a tribunal, the question is not "what does the assessment say?" It's "what can't this person do, or what do they find harder to do, as a result of their condition?" Tribunals look at day-to-day activities: reading, writing, processing information, concentration, memory, and communication.

For dyslexia, the common functional impacts are reading accurately under time pressure, writing at the speed expected in a professional context, retaining verbal instructions, and switching between tasks that involve written material. These are all day-to-day activities in most jobs. If dyslexia makes any of them harder by more than a trivial amount, the definition is met.

The Enna Global case analysis of Hastings v FEAT (Employment Tribunal, 2024) is worth knowing: the tribunal found against an employer who had failed to make adjustments despite clear evidence of functional difficulty, even where the employee had not provided a formal assessment report. What mattered was the functional impact, evidenced by the employee's own account and observable performance patterns, not a clinical document.

Two things follow from this. First, you don't need a perfect assessment to demonstrate disability. Second, your employer cannot dismiss the legal duty by pointing at a severity label on a document.

The duty turns on function, not classification.

If you haven't yet worked out which specific tasks are hardest and what adjustments would help, the reasonable adjustments builder walks you through your challenges and turns them into a clear, written conversation plan for HR, in about two minutes.

The strongest adjustments request focuses on specific tasks: "I take twice as long to proofread documents and I miss errors under time pressure" is more useful than "I have mild dyslexia." Task-level evidence is what the legal test actually requires.

What to do if your employer uses severity to refuse

Here is the direct answer: if your employer refuses adjustments on the basis that your dyslexia is "only mild," challenge the reasoning in writing and ask them to identify the legal basis for their position. They cannot point to a clause in the Equality Act 2010, because no such clause exists.

The practical sequence is as follows. Put your adjustments request in writing, framed around the specific tasks that are harder and the specific changes that would help. If HR or your manager refers to your assessment grade as the reason for refusal, respond in writing noting that the Equality Act 2010 defines disability by functional impact, not clinical severity, and that you are asking them to reconsider on that basis.

Keep records of everything. A timestamped written request and a written refusal are the two documents a tribunal would want to see. An employer who refuses without engaging with the functional impact evidence is already in a weak position.

If your employer continues to refuse, contact ACAS (UK) before any claim. Early conciliation is free, mandatory before a tribunal claim, and often resolves disputes without a hearing. In the US, file a charge with the EEOC; you have 180 days from the discriminatory act (300 days in some states).

On the UK side, it's also worth knowing that the Employment Rights Act 2025 extended the tribunal time limit for disability discrimination claims from three to six months, with the change expected in force from October 2026. You have more time than you used to, but starting early still matters.

The broader picture: access to adjustments in the UK runs through two parallel tracks. Your employer's Equality Act 2010 duty applies whether or not you use Access to Work. The Access to Work guide covers the separate grant route, which funds assistive technology and specialist support independently of your employer's budget.

The math points toward challenging any severity-based refusal in writing, immediately. Employers who understand the legal position usually back down. Those who don't have given you the written record you'd need for a formal claim.