If you are an operator of trade or business (T:mi), an agricultural/forestry operator, select Manage your tax matters in MyTax. When you start with Manage your tax matters, you can access all your tax affairs. Read more: New in MyTax
I want to change something in my payment arrangement. Can I do that?
You cannot change the contents of an active payment arrangement. For example, you cannot ask the Tax Administration to remove taxes from the arrangement or add new taxes to it.
In addition, you cannot change the number of payment instalments. However, you can make payments in an accelerated schedule, which may reduce the overall number of your payment instalments.