How do I manage joint activity for a sole proprietorship?

If you apply simplified information submission for joint activities, you must state the social security number of the accounting responsible , ie the person who reports all income and expenses, etc. for the joint activities on tax form NE page 1.

The person who has reported all income/expenses up to and including field code R17 in a joint activity indicates with field code R18 on NE the other person's share of the result if there is a surplus. And at code R19 if there is a deficit. The person who is not responsible for accounting must not enter any information before field code R17 on tax form NE, but must start stating their share of the result at R18 or R19.

This situation is not handled in Visma Skatt & Bokslut Pro. You can not create a tax form NE without entering information on page 1. This is something you need to handle manually outside the service.

Read more about it here: Joint activity.