Hej LeFoah
your solution looks ok and thank you for sharing it
You can shorten it a bit using sumproduct like this for october
Code:
=SUMPRODUCT((Intäkter!H5:H105)*( MONTH(Intäkter!A5:A105)=10)*Intäkter!D5:D105="Översättning SVE-ENG")
or replace 10 with MONTH(your_ref)
I find sumproduct more flexible than SUMIFS, but maybe it's slower