If you submit your time worked via a Hydrogen or Client Paper Timesheet or on the InTime Portal, please follow the below deadlines:

Payment period

Invoice and timesheet approval deadline - Midnight on:

Funds received

February 2020


4th February 2020

17th February 2020

March 2020

3rd March 2020

16th March 2020

April 2020

2nd April 2020

15th April 2020

N.B. Payment calendars are issued in 3 months rolling blocks - these dates may be subject to change.

Please note, you may be required to completed a client specific timesheet or portal - please check with Hydrogen before starting your assignment


  • InTime is our online portal for submitting timesheets and expenses if you are not required to use a client specific timesheet or portal.  Please check the payment guide sent on your original offer email to confirm if you will be using InTime.  
  • InTime is simple and easy to use and can be accessed from smart phones and tablets. As a contractor or timesheet approver, you will receive a unique login to quickly submit or approve time and expense claims as well as being able to view timesheet and payment statuses.
  • If you have not yet received your InTime login details please contractor our Contractor Care Team at intime@hydrogengroup.com 
  • Click below for our InTime User Guides for Managers and Contractors:​

Self bill

  • Hydrogen operates a Self Bill payment process for contractors. This means that you do not need to send an invoice with your timesheet or expense claim as we will produce an invoice on your behalf and email it to you.
  • Self Bill is fully HMRC compliant, helps to reduce payment delays and is a common practice within the recruitment industry (you may have contracted this way previously). 
  • As part of the onboarding process you will be asked to sign a Self Bill Agreement which may be included in your contract.
  • Please note that if you are paid via an Umbrella Company, we will be asking them to sign the Self Bill agreement as they send us the invoice.
  • If you have any questions, please email selfbill@hydrogengroup.com.   

Contact information

For all contract related enquires please contact our contractor care team:

For all timesheet submissions and pay related enquiries please contact payroll: