If you submit your timesheets on a client portal, please follow the below deadlines:
Payment Preiod Invoice and timesheet approval deadline Funds received
January 2019 4th February 2019 - midnight  15th February 2019
Week endings to be submitted: 6th, 13th, 20th, 27th Jan & 3rd Feb (5 weeks)
February 2019 4th March 2019 - midnight  15th March 2019
Week endings to be submitted: 10th, 17th, 24th Feb & 3rd Mar (4 weeks)
March 2019 2nd April 2019 - midnight  15th April 2019
Week endings to be submitted: 10th, 17th, 24th & 31st Mar (4 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: