De or het subsidievermindering?

The correct Dutch article is:

de subsidievermindering

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

How to use subsidievermindering

the subsidieverminderingde subsidievermindering
this subsidieverminderingdeze subsidievermindering
that subsidieverminderingdie subsidievermindering
our subsidieverminderingonze subsidievermindering
your subsidieverminderingjouw subsidievermindering
every subsidieverminderingelke subsidievermindering
which subsidievermindering?welke subsidievermindering?
a big subsidievermindering / the big subsidieverminderingeen grote subsidievermindering, de grote subsidievermindering