De or het omzetvermindering?

The correct Dutch article is:

de omzetvermindering

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

How to use omzetvermindering

the omzetverminderingde omzetvermindering
this omzetverminderingdeze omzetvermindering
that omzetverminderingdie omzetvermindering
our omzetverminderingonze omzetvermindering
your omzetverminderingjouw omzetvermindering
every omzetverminderingelke omzetvermindering
which omzetvermindering?welke omzetvermindering?
a big omzetvermindering / the big omzetverminderingeen grote omzetvermindering, de grote omzetvermindering