Getting started
Adding clients to your practice
Limited companies, sole traders, and employers — which identifiers Hydra needs before you can file.
From Clients → Add client, set the entity type and the refs you already hold: company number and UTR for CT600, VRN for VAT, NINO for Self Assessment, PAYE and Accounts Office refs for RTI.
Flags for VAT-registered and employer unlock the matching module tabs. You can add identifiers later, but Hydra will block submit until the statutory fields for that rail are present.