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

Payment period

Invoice and timesheet approval deadline

Funds received

Sept 2018

2nd October 2018 - midnight

15th October 2018

Oct 2018

2nd November 2018 - midnight

15th November 2018

Nov 2018

4th December 2018 - midnight

17th December 2018

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


All invoices need to be addressed to Hydrogen International Limited and show the following:

  • The name of the contractor 
  • A valid invoice number (not just the date) 
  • Ltd Company bank details 
  • Ltd Company number 
  • Ltd Company registered address   

When claiming for both time worked and expenses, please provide two separate invoices; one for the time worked and one for expenses. We recommend you keep copies of all documents. 


V.A.T Registered Limited Companies need to show the following:            

  • The V.A.T. element on the invoice 
  • The Ltd Company V.A.T. registration number 
  • If the Limited Company is not V.A.T registered, this needs to be indicated on the invoice

Useful documents

Contact information

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

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