De or het kostensplitsing?

The correct Dutch article is:

de kostensplitsing

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

How to use kostensplitsing

the kostensplitsingde kostensplitsing
this kostensplitsingdeze kostensplitsing
that kostensplitsingdie kostensplitsing
our kostensplitsingonze kostensplitsing
your kostensplitsingjouw kostensplitsing
every kostensplitsingelke kostensplitsing
which kostensplitsing?welke kostensplitsing?
a big kostensplitsing / the big kostensplitsingeen grote kostensplitsing, de grote kostensplitsing