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Employment law and compliance

What is the ADA in the workplace?

A plain-English definition of ADA, how it works, a worked example, and the mistakes US employers make, checked against primary sources.

HRTally Research Team
Updated October 25, 2026 · 7 min read · Editorial standards
Definition

The ADA, or Americans with Disabilities Act, is a 1990 federal law that bans discrimination against qualified people with disabilities and requires employers with 15 or more employees to provide reasonable accommodations unless doing so would cause undue hardship. Title I covers employment.

Key takeaways

  • A disability is an impairment that substantially limits a major life activity, a record of one, or being regarded as having one.
  • The 2008 amendments broadened the definition, so most conditions now qualify.
  • Employers can't ask disability-related questions or require medical exams before a job offer.
  • Disability appeared in 38% of EEOC charges in fiscal year 2024.

How ADA works

The ADA protects qualified individuals: people who can perform the essential functions of the job, with or without reasonable accommodation (EEOC, Disability discrimination). When an employee asks for help because of a medical condition, the employer must engage in an interactive process to find an effective accommodation.

Medical inquiries follow a timeline. Before an offer, employers can't ask about disabilities or require medical exams. After a conditional offer, they can require exams if all entering employees in the same job get them. During employment, inquiries must be job-related and consistent with business necessity. Medical information must be kept confidential and separate from personnel files.

The ADA Amendments Act of 2008 told courts to interpret disability broadly, and conditions that are episodic or in remission, like epilepsy or cancer, count if they would be limiting when active.

ADA example

An accounting clerk with a back condition asks for a sit-stand desk and the ability to take short breaks. HR meets with her, reviews a brief note from her doctor confirming the need, and orders a desk for $450. Her manager adjusts her schedule to allow two extra five-minute breaks. The process takes nine days, is documented in a short accommodation record, and costs less than a single day of recruiting a replacement.

Why ADA matters for employers

Disability-related charges are common: they appeared in 38.0% of EEOC charges in fiscal year 2024 (FY2024 EEOC enforcement statistics summary (CWC)). Many involve failures in the process, such as ignoring a request, delaying for months, or firing someone at the end of FMLA without considering more leave as an accommodation.

Good process is cheap insurance. Train managers to recognize accommodation requests, which don't require the word "ADA," route them to HR, and keep records of each step. Leave management software can track ADA, FMLA, and state leave together so cases don't fall through gaps.

Common ADA mistakes to avoid

Asking about health in interviews

Pre-offer disability questions are illegal, even casual ones.

Requiring magic words

An employee doesn't need to say "ADA" or "accommodation" to make a request.

Automatically terminating at the end of FMLA

Additional leave can be a reasonable accommodation.

Storing medical records in personnel files

Keep them in a separate, confidential file.

ADA: questions people also ask

Which employers must follow the ADA?
Private employers with 15 or more employees, state and local governments, employment agencies, and labor unions.
What counts as a disability under the ADA?
A physical or mental impairment that substantially limits a major life activity, a record of such an impairment, or being regarded as having one.
Can an employer ask about a disability?
Not before a job offer. After an offer and during employment, questions must follow ADA rules and be job-related.
What is undue hardship under the ADA?
Significant difficulty or expense considering the employer's size, resources, and operations. It's a high bar, especially for large employers.
Does the ADA cover mental health conditions?
Yes. Conditions such as depression, anxiety, PTSD, and bipolar disorder often qualify as disabilities.

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How we wrote this definition

HRTally glossary entries are written by people who have run US payroll, benefits, and HR operations, then checked line by line against primary sources such as the IRS, Department of Labor, EEOC, and Bureau of Labor Statistics. Dollar limits and rates are for 2026 unless stated. We review every entry at least twice a year and whenever a rule changes. This page explains general rules and isn't legal or tax advice; state law can differ. Read our editorial standards.

Sources

Cite this definition

Teachers, consultants, and HR communities are welcome to quote this definition with a link back to HRTally.

<blockquote>The ADA, or Americans with Disabilities Act, is a 1990 federal law that bans discrimination against qualified people with disabilities and requires employers with 15 or more employees to provide reasonable accommodations unless doing so would cause undue hardship. Title I covers employment.</blockquote><p>Source: <a href="https://www.hrtally.com/hr-glossary/ada/">HRTally HR Glossary, ADA</a></p>

Written by the HRTally Research Team

Our guides are written and reviewed by people with hands-on US HR, payroll, and HR technology experience. Legal and tax facts are checked against primary sources, such as the Department of Labor, IRS, EEOC, and USCIS, and linked at the end of each guide. Vendors never review or pay for our editorial content.

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