De or het omslagbelasting?

The correct Dutch article is:

de omslagbelasting

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

How to use omslagbelasting

the omslagbelastingde omslagbelasting
this omslagbelastingdeze omslagbelasting
that omslagbelastingdie omslagbelasting
our omslagbelastingonze omslagbelasting
your omslagbelastingjouw omslagbelasting
every omslagbelastingelke omslagbelasting
which omslagbelasting?welke omslagbelasting?
a big omslagbelasting / the big omslagbelastingeen grote omslagbelasting, de grote omslagbelasting