Can I pay the additional claim resulting from the last tax assessment in instalments?

Yes, provided that the conditions for deferring the tax debt are met. This may be the case, for example, if it is a major final payment for which you were unable to arrange in time and you do not have the funds required for payment on the due date, nor are you in a position to obtain these funds in a reasonable manner. You can then also apply for a deferral in instalments. In your application, you should also make a statement about the amount of the instalments.

You might also be interested in "I can't pay my tax debt on time and would like to apply for a deferral. What do I need to look out for in detail?"