Modified Duty Letters: What You Need to Know
A modified duty letter (also called a "light duty letter" or "functional limitations letter") is medical documentation that outlines what work you CAN do while recovering from an illness or injury. It's the bridge between being completely off work and returning to full duties.
When You Need a Modified Duty Letter
- Recovering from surgery but able to do desk work
- Back injury that prevents lifting but not sitting
- Broken arm/wrist that limits certain tasks
- Post-concussion with screen time restrictions
- Mental health recovery with reduced hours
- Pregnancy-related limitations
- Chronic condition flare-up affecting specific activities
What a Good Modified Duty Letter Includes
| Element | Example | Purpose |
|---|---|---|
| What you CAN do | "Can perform desk work, attend meetings, use computer" | Helps employer assign appropriate tasks |
| What you CANNOT do | "No lifting over 5 kg, no standing over 30 min" | Sets clear boundaries |
| Duration | "For 4 weeks, reassess on [date]" | Gives employer planning timeline |
| Specific parameters | "Maximum 6 hours/day for first 2 weeks" | Quantifiable restrictions |
| Review date | "Follow-up assessment on [date]" | Ensures ongoing monitoring |
What It Should NOT Include
- Your specific diagnosis
- Details about your treatment
- Medications you're taking
- Prognosis beyond the review date
- Personal medical history
Your Employer's Legal Obligations
Under Canadian human rights law, your employer MUST:
1. Accept the letter from any licensed physician
2. Attempt to accommodate your restrictions
3. Provide modified work if reasonably available
4. Not penalize you for working modified duties
5. Maintain your pay at your regular rate (in most cases)
6. Keep your information confidential — only HR and your direct supervisor need to know
The limit: Accommodation to the point of "undue hardship." For most employers, providing modified duties is not undue hardship.
Common Modified Duty Arrangements
Physical restrictions:
- No lifting over specified weight
- No repetitive bending/twisting
- Alternating sitting/standing
- No climbing ladders or working at heights
- No driving company vehicles
Time restrictions:
- Reduced hours (4-6 hours instead of 8)
- No overtime
- No night shifts
- Mandatory breaks every 2 hours
- Graduated return (increasing hours weekly)
Environmental restrictions:
- No exposure to dust/chemicals
- Temperature-controlled environment only
- Quiet workspace (post-concussion)
- No screen time over 4 hours/day
- Ground-level work only
Getting a Modified Duty Letter
From your treating physician: Best option if they know your condition well. They can provide specific, medically-informed restrictions.
From an online physician service: Appropriate for straightforward cases (back pain, minor injury recovery, mental health). The physician assesses your reported capabilities and limitations.
From a specialist: For complex cases (post-surgical, neurological, chronic conditions) where specific expertise is needed.
Frequently Asked Questions
Can my employer assign me ANY work within my restrictions?
They should assign work that's meaningful and within your qualifications. Assigning demeaning or punitive work (cleaning bathrooms when you're an accountant) could constitute harassment.
What if my employer says they have no modified work available?
They must demonstrate they've genuinely explored options. "No modified work" claims are often challenged successfully — most workplaces have some tasks within any set of restrictions.
How often do I need to update my modified duty letter?
At each review date specified in the letter, or when your restrictions change. Most letters are valid for 2-6 weeks before reassessment.
Can I refuse modified duties and stay home instead?
Generally no. If your physician says you can work with modifications and your employer provides appropriate modified work, refusing could affect your sick leave benefits.
Sources
- Canadian Human Rights Commission — Duty to Accommodate
- Provincial Workers' Compensation Boards — Modified Work Programs
- Canadian Centre for Occupational Health and Safety — Return to Work