A-melding is Norway's unified monthly reporting for employers. It covers Skatteetaten (tax withholding), NAV (employment), and SSB (statistics). Deadline: the 5th of each month for the previous month's payroll. This guide walks through how to submit correctly and what to do on issues.
A-melding contains four main elements: employment (start/end date per employee), income (salary, benefits in kind, refunds), prepaid tax withholding, and employer contribution. Each employee is reported with national ID number (11 digits) — not d-number or temporary ID.
Norway has differentiated employer contributions based on the workplace zone. Zone I (Oslo/Akershus/big cities) = 14.1 %, zone II = 10.6 %, zone III = 6.4 %, zone IV = 5.1 %. The workplace, not the company's head office, determines the zone. Home office pre-COVID = company zone; post 2024 interpretation = employee's residence zone.
If you discover an error in an already submitted A-melding, a correction is submitted. The platform generates only the delta — you don't need to re-submit the entire month. Example: an employee got the wrong bonus → correction shows new amount + original amount + reason.
After submission Altinn returns a receipt within 5-10 seconds. If there are issues they are shown in plain text with field reference. Common issues: invalid national ID (wrong check digit), missing zone, income type not matched to code list. The platform runs validators before submission to eliminate these.
Talk to us about how the 4b2b ecosystem fits into your existing Altinn process. We have implementations from 50-employee firms to OBX-listed companies.
