De or het loonberekening?

The correct Dutch article is:

de loonberekening

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

How to use loonberekening

the loonberekeningde loonberekening
this loonberekeningdeze loonberekening
that loonberekeningdie loonberekening
our loonberekeningonze loonberekening
your loonberekeningjouw loonberekening
every loonberekeningelke loonberekening
which loonberekening?welke loonberekening?
a big loonberekening / the big loonberekeningeen grote loonberekening, de grote loonberekening