The Enrolment Window for 2025/2026 is open from 6 May 2025 to 20 May 2025.

How to enrol

It’s easy to enrol. Find out what to know and do to enrol in your benefits.

When you can enrol
When You're Newly Eligible for Benefits

When You Enrol
- Following your hire, you’ll receive an email or letter stating when your enrolment period will begin.
During Annual Enrolment

When You Enrol
- In May
When Your Elections Take Effect
- 1 June
Because of a Life Event

When You Enrol
- You can only make changes to your benefits outside of Annual Enrolment if you have a life event, such as the birth of a child, gain or loss of dependent coverage, a reduction of salary (20% or more), Long-Term Disability (LTD) or a pension change. You must make changes by the first day of the following month or wait until the next Annual Enrolment or life event.
When Your Elections Take Effect
- If you make your election between the 1st and 20th of the month, Your benefits take effect starting the following month of your enrolment.
- If you make your election from the 21st through the end of the month your benefits become effective one month after the following month.

Enrol
1. Visit ironmountain.tbs.aon.com and type in your username (your employee number ID) and password. If you’ve forgotten your password, you can reset this from the login page.
2. Review and confirm that your details are correct and add any dependents you wish to cover.
3. From the home page, click on “Update My Benefits.”
4. Once you’re finished with your selections, click “Confirm Choices.”
5. Check the box to confirm your choices and to indicate that you agree with the terms and conditions. Then, click “Confirm Choices” again.

What to do if you have a life event

If you experience a life event during the year — like having a child or your spouse/partner gaining or losing cover outside of Iron Mountain — you may need to modify some of your benefits. Go to the Flexible Benefits website to review your benefits and/or make changes, or contact 01252 767 058 or ironmountain@aon.co.uk for assistance.

Having Trouble Enroling?

If you need assistance enroling for benefits, call the Flexible Benefits helpline at 01252 767 058.

Contacts

Disclaimer

© 2025 Iron Mountain Incorporated. All Rights Reserved. This website is not intended to replace the Summary Plan Documents that provide further details on Iron Mountain medical, dental, vision, Flexible Spending Account (FSA), retirement, disability, Life, Accidental Death & Dismemberment (AD&D) and any additional plans available to you. This site is a brief synopsis of key features of your available benefits plans. It's intended to help you use these plans effectively and alert you to actions or situations that could limit the benefits you and your eligible dependents might receive. Refer to the Summary Plan Documents for exact terms and conditions of coverage. If any conflict arises between this site and the official Plan Documents, the terms of the actual Plan Documents or other applicable documents will govern. Iron Mountain reserves the right to change, modify or terminate the plans at any time. This website isn't a contract for purposes of employment or payment of benefits.

Certain employees subject to a collective bargaining agreement are only eligible to participate in certain benefits to the extent provided in the applicable collective bargaining agreement.

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