Your client keeps the books day to day in Arvello. You review them, run payroll and file with the Accountant role, or read along as a Viewer.
One Accountant or Viewer seat is free on every plan and doesn't count as a team member, so inviting you costs your client nothing extra.

Each client invites you once. Your companies page lists them all, and the switcher moves you between them without signing out. The free Accountant or Viewer seat applies in every company.
On every plan you see the same ledger, trial balance, reports and documents as your client. Your time goes on review rather than re-entry. Each client company is a click away from the same login.
Type the company's name or registry code. Arvello fills in its details, board members and shareholders from the Business Register. Opening balances come from the last filed annual report, so you start from figures that have already been filed.
The KMD, KMD INF and TSD build from the books. Check them, then download the files and upload them to e-MTA.
Your client can ask Arvo how the app works or what a rule says before they ask you. Answers link the Help Centre page, Act or EMTA guidance they rest on.
By the 20th of the month after the period, in e-MTA. For October, that is 20 November.
KMS § 27 lg 1