De or het projectbegroting?

The correct Dutch article is:

de projectbegroting

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

How to use projectbegroting

the projectbegrotingde projectbegroting
this projectbegrotingdeze projectbegroting
that projectbegrotingdie projectbegroting
our projectbegrotingonze projectbegroting
your projectbegrotingjouw projectbegroting
every projectbegrotingelke projectbegroting
which projectbegroting?welke projectbegroting?
a big projectbegroting / the big projectbegrotingeen grote projectbegroting, de grote projectbegroting