Phased Return to Work Letter - Do I Need a Sick Note?

If you're returning to work after illness, injury or surgery, your employer may ask for a phased return to work letter from your doctor confirming the recommended adjustments to your duties, hours or working environment.

A phased return to work doesn't always require a new sick note — but it does usually require a formal letter from a GMC-registered GP setting out what adjustments are needed and for how long. Get yours online today, same day, direct to your inbox. Apply online anytime, no appointment needed.

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Phased Return to Work — Sick Note, Return to Work Certificate & Light Duties Letter

Returning to work after sick leave often requires medical documentation — whether you are coming back gradually on reduced hours, resuming duties with specific adjustments, or your employer needs written confirmation that you are fit to return. MedicalCert issues phased return sick notes, return-to-work certificates, and reasonable adjustments letters same day, online, through GMC-registered UK doctors. No GP appointment needed.

There are three distinct documents used around a return to work — and different situations need different ones: a phased return sick note is issued while you are still partially unfit and certifies a gradual return; a return to work certificate (also called a fit-to-return letter) confirms you have recovered and are ready to resume duties; a reasonable adjustments / light duties letter documents ongoing modifications to your role. This page covers all three.

Still partially unfit Phased Return Sick Note “May be fit for work” assessment. Certifies a gradual return — reduced hours or days — while you are still recovering. Issued before you are fully well.

Fully recovered Return to Work Certificate Confirms you have recovered and are fit to resume duties — fully or on a structured plan. Issued when sick leave has ended.

Ongoing condition Light Duties / Adjustments Letter Documents specific modifications to your role — light duties, adjusted hours, home working — for an ongoing condition or disability. Not time-limited.

Phased Return to Work Sick Note

A phased return to work sick note is issued under the “may be fit for work” assessment on a fit note. It certifies that you are not yet ready for full duties but can return in a limited capacity — for example, three days per week initially, building to five over four weeks. This is different from a standard sick note (which certifies full incapacity) and from a return-to-work clearance letter (which certifies full recovery).

Not fit for work

Standard sick leave. Full incapacity — you cannot work at all. Your employer should not require attendance. Used during active illness or recovery.

May be fit for work ← phased return

You can return in a limited capacity if the employer can accommodate specific arrangements. The doctor specifies reduced days, hours, duties, or other conditions. If the employer cannot accommodate them, the note is treated as “not fit for work.”

ACAS guidance confirms that fit note recommendations are advisory — employers must consider them but are not legally obliged to implement them. If your condition qualifies as a disability under the Equality Act 2010, your employer has a legal duty to consider the phased return recommendation as a reasonable adjustment.

Sick pay during a phased return — April 2026 changes

From 6 April 2026, the Employment Rights Act 2025 significantly improves sick pay during phased returns. SSP is now assessed day-by-day rather than requiring four consecutive sick days. This means an employee returning on three days per week receives SSP for the two days per week they are not yet able to attend — something that was rarely possible under the old rules.

Previous rules: SSP required four consecutive absent days. Phased return working patterns typically broke this run, meaning most employees on phased returns received no sick pay for absent days.

New rules: SSP payable from day one of absence, assessed per qualifying day. Rate: £123.25/week or 80% of average weekly earnings, whichever is lower. Lower earnings limit removed — all employees qualify regardless of income.

Return to Work Certificate — Fit to Return Letter from Doctor

A return to work certificate (also called a fit-to-return certificate, return to work letter from doctor, or medical clearance letter) is issued when you have recovered from illness and your employer requires written medical confirmation before reinstating you. It is the document that closes the sick leave episode.

Many employers request this for absences of four weeks or more, for safety-critical roles, or as a matter of occupational health policy. While employers cannot generally make return legally conditional on such a letter in standard employment situations, the request is common and legitimate — particularly for longer absences.

What a return to work certificate includes

✔Your full name, date of birth, and contact details
✔Confirmation you are medically fit to return to work
✔The date from which you are cleared to return
✔Whether you are fit for full duties or a structured return arrangement
✔Any recommended adjustments or restrictions, where applicable
✔GMC registration number of the signing doctor
✔Unique QR code for employer verification

⚠ Note: In most standard employment situations, the expiry of a fit note is sufficient — an employer cannot make return legally conditional on a separate clearance letter. However, where a return-to-work letter is legitimately requested (safety-critical role, occupational health policy, prolonged absence), a MedicalCert certificate satisfies the requirement. If the request feels unreasonable, ACAS offers free advice at acas.org.uk.

Light Duties Letter & Reasonable Adjustments Letter

A light duties letter — also called a reasonable adjustments letter, adjusted duties letter, or work adjustment certificate — documents specific ongoing modifications to your role. Unlike a phased return note (which is time-limited and covers the transition back) or a return-to-work certificate (which confirms full recovery), a reasonable adjustments letter addresses permanent or long-term modifications needed because of an ongoing condition, disability, or recovery period.

Common scenarios where a light duties or reasonable adjustments letter is needed:

✔Back injury or musculoskeletal condition requiring no heavy lifting or modified physical duties

✔Mental health condition requiring reduced workload, no client-facing duties, or flexible hours

✔Post-surgical recovery where specific movements, tasks, or environments must be avoided

✔Chronic condition (migraines, fibromyalgia, fatigue) requiring flexible start times or remote working

✔Pregnancy-related adjustments requiring removal from certain duties or environments

✔Disability accommodation requiring ergonomic changes, software, or role modifications

Equality Act 2010 — your employer’s legal duty

Where your condition meets the Equality Act 2010 disability definition — a substantial and long-term adverse effect on normal day-to-day activities for 12 months or more — your employer has a legal duty to consider reasonable adjustments. A medical letter documenting the adjustments recommended by a GMC-registered doctor provides the clinical basis for that duty to be acted on.

Employers cannot lawfully refuse to consider reasonable adjustments where the disability threshold is met. A light duties letter gives your employer documented clinical evidence of what adjustments are appropriate — which both supports your request and provides the employer with evidence of due process if the adjustment is challenged.

For detailed workplace modification documentation, a dedicated work adjustment certificate provides a more clinically detailed framework than a standard sick note or return certificate.

Which Certificate Do You Need?

Common scenarios and which document applies

Returning from 6 weeks off with back pain, employer wants confirmation before you resume: Return to work certificate — confirms fitness to resume, can note any physical restrictions.

Returning from depression but not yet ready for full hours: Phased return sick note — “may be fit for work” with reduced hours documented. SSP applies to non-working days from April 2026.

Back at work but ongoing condition means you can’t lift heavy loads permanently: Light duties / reasonable adjustments letter — documents the ongoing restriction for employer records and Equality Act purposes.

Returning from surgery but want a structured 3-month build-back: Phased return sick note for the first few weeks, then return to work certificate once fully reinstated.

Employer wants documentation before you return — you’re fully recovered: Return to work certificate — straightforward medical clearance with confirmed return date.

How to Get Your Certificate — Same Day

Complete the online consultation

Describe your condition, how long you were off, your current capacity, and what arrangement you are proposing — reduced days, light duties, specific adjustments. The more specific you are, the more useful the certificate will be to your employer.

GMC-registered doctor reviews your case

One of our GPs reviews the same day and issues the appropriate certificate — phased return, return-to-work clearance, or light duties/adjustments letter — based on your clinical picture. If a certificate cannot be supported, you receive a full refund.

Certificate delivered to your inbox

Same day (submit before 9pm) or by 9am the following morning. Forward directly to your employer or HR. The QR code allows instant credential verification. ACAS recommends putting any agreed return arrangement in writing — the certificate gives both sides the clinical documentation to support that agreement.

Work sick note → Return-to-work clearance letter → Work adjustment certificate → Mental health sick note →

Phased Return to Work FAQs

Yes — a phased return requires a fit note with a “may be fit for work” assessment that documents the recommended return arrangement. A standard sick note (“not fit for work”) certifies full absence and does not support a phased return. The “may be fit for work” assessment specifically allows the doctor to note reduced hours, days, or duties as conditions for return. Without this documentation, your employer has no clinical basis for the phased arrangement and you have no formal protection if the arrangement is challenged.

A return to work letter from a doctor — also called a return to work certificate, fit to return certificate, or medical clearance letter — is a document from a GMC-registered doctor confirming that you have recovered from illness and are fit to resume your duties. It closes the sick leave episode. Employers often request this for absences of four weeks or more, for safety-critical roles, or as part of occupational health policy. It is distinct from a sick note (which certifies incapacity) and from a phased return note (which certifies partial return). MedicalCert issues return to work letters same day, online.

No — fit note recommendations are advisory, not legally binding. Your employer must consider the recommendation carefully, but if they cannot accommodate it operationally, they may treat the note as “not fit for work” and continue the sick leave. However, where your condition qualifies as a disability under the Equality Act 2010, the employer has a legal duty to consider reasonable adjustments — and refusing a medically recommended phased return without good reason could constitute a failure to make reasonable adjustments, which is unlawful. Most long-term conditions resulting in extended absence will meet the Equality Act disability threshold.

For days worked: normal pay for hours worked. For days not yet attending: from 6 April 2026, SSP is payable for each qualifying absent day during a phased return — even if you are attending on other days in the same week. This is a significant change from the old rules, where the requirement for four consecutive sick days meant most phased return absent days did not qualify for SSP. The new rate is £123.25/week flat rate or 80% of average weekly earnings, whichever is lower. Some employers pay full salary throughout a phased return — check your employment contract.

A light duties letter — also called a reasonable adjustments letter or adjusted duties letter — is a medical document from a GMC-registered doctor recommending specific modifications to your role. Unlike a phased return note (time-limited, covers the transition back) it documents ongoing modifications for a longer-term condition or disability — no heavy lifting, reduced hours, home working, specific environment changes. Where your condition meets the Equality Act 2010 disability definition, your employer has a legal duty to consider these adjustments. The letter provides clinical evidence for that process. A dedicated work adjustment certificate provides the most detailed clinical framing for this purpose.

There is no statutory fixed duration. Most phased returns last 2–6 weeks, with hours or days increasing at agreed milestones. For more complex conditions or longer absences, a phased return of several months may be appropriate. ACAS recommends putting the arrangement in writing and reviewing it at regular intervals. If your condition worsens during the phased return and you are no longer able to attend even in a reduced capacity, contact your employer immediately — a new standard sick note certifying full incapacity may then be needed. A phased return is not irrevocable.

Yes. MedicalCert issues return to work certificates online, same day, through GMC-registered UK doctors. No appointment is needed. Complete the online consultation describing your condition, recovery, and the return arrangement — the doctor reviews and issues the certificate the same day (submit before 9pm) or by 9am the following morning. Full refund if a certificate cannot be issued. The certificate includes the doctor’s GMC registration number and a QR code for employer verification.

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