De or het salarisaanpassing?

The correct Dutch article is:

de salarisaanpassing

Rule Words ending in -ing: almost always de. See the rule

How to use salarisaanpassing

the salarisaanpassingde salarisaanpassing
this salarisaanpassingdeze salarisaanpassing
that salarisaanpassingdie salarisaanpassing
our salarisaanpassingonze salarisaanpassing
your salarisaanpassingjouw salarisaanpassing
every salarisaanpassingelke salarisaanpassing
which salarisaanpassing?welke salarisaanpassing?
a big salarisaanpassing / the big salarisaanpassingeen grote salarisaanpassing, de grote salarisaanpassing