De or het loononderhandeling?

The correct Dutch article is:

de loononderhandeling

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

How to use loononderhandeling

the loononderhandelingde loononderhandeling
this loononderhandelingdeze loononderhandeling
that loononderhandelingdie loononderhandeling
our loononderhandelingonze loononderhandeling
your loononderhandelingjouw loononderhandeling
every loononderhandelingelke loononderhandeling
which loononderhandeling?welke loononderhandeling?
a big loononderhandeling / the big loononderhandelingeen grote loononderhandeling, de grote loononderhandeling