De or het loonderving?

The correct Dutch article is:

de loonderving

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

How to use loonderving

the loondervingde loonderving
this loondervingdeze loonderving
that loondervingdie loonderving
our loondervingonze loonderving
your loondervingjouw loonderving
every loondervingelke loonderving
which loonderving?welke loonderving?
a big loonderving / the big loondervingeen grote loonderving, de grote loonderving