If you submit your timesheets on a client portal, please follow the below deadlines:
Payment Preiod Invoice and timesheet approval deadline Funds received
September 2018 2nd October 2018 - midnight 15th October 2018
Week endings to be submitted: 2nd September, 9th September, 16th September, 23rd September, 30th September (5 weeks)
October 2018 2nd November 2018 - midnight 15th November 2018
Week endings to be submitted: 7th October, 14th October, 21st October, 28th October (4 weeks)
November 2018 4th December 2018 - midnight 17th December 2018
Week endings to be submitted: 4th November, 11th November, 18th November, 25th November, 2nd December (5 weeks)

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


Please note expenses must be submitted within two months of being incurred. Any expenses submitted outside of this period may result in non- payment.

Expenses must adhere to the client’s expense policy and all claims need to be accompanied with copies of all corresponding receipts.


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: