Are you using Microsoft Access to create the database? If so, post details
of what you need to do. If not, you would do best to find a newsgroup
appropriate to the software you are using to create the form.
Buy TurboTax or one of the many commercial tax packages. It'll cost you $30 or
so; you'll spend ten times that in your time and effort duplicating its
functionality in Access... not to mention the fines and penalties if you
should, heaven forbid, make a mistake in your code.