De or het tegenvordering?

The correct Dutch article is:

de tegenvordering

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

How to use tegenvordering

the tegenvorderingde tegenvordering
this tegenvorderingdeze tegenvordering
that tegenvorderingdie tegenvordering
our tegenvorderingonze tegenvordering
your tegenvorderingjouw tegenvordering
every tegenvorderingelke tegenvordering
which tegenvordering?welke tegenvordering?
a big tegenvordering / the big tegenvorderingeen grote tegenvordering, de grote tegenvordering