De or het tariefaanpassing?

The correct Dutch article is:

de tariefaanpassing

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

How to use tariefaanpassing

the tariefaanpassingde tariefaanpassing
this tariefaanpassingdeze tariefaanpassing
that tariefaanpassingdie tariefaanpassing
our tariefaanpassingonze tariefaanpassing
your tariefaanpassingjouw tariefaanpassing
every tariefaanpassingelke tariefaanpassing
which tariefaanpassing?welke tariefaanpassing?
a big tariefaanpassing / the big tariefaanpassingeen grote tariefaanpassing, de grote tariefaanpassing