De or het toonbanklening?

The correct Dutch article is:

de toonbanklening

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

How to use toonbanklening

the toonbankleningde toonbanklening
this toonbankleningdeze toonbanklening
that toonbankleningdie toonbanklening
our toonbankleningonze toonbanklening
your toonbankleningjouw toonbanklening
every toonbankleningelke toonbanklening
which toonbanklening?welke toonbanklening?
a big toonbanklening / the big toonbankleningeen grote toonbanklening, de grote toonbanklening