I Received A 1099-A. BOX 2 HAS 250,521.00 AND BOX 4 HAS 19,500.00, BOX 5 IS MARKED "YES". HOW DO I CALCULATE MY TAX LIABILITY?

First, you may have NO tax liability unless and until you get a Form 1099-C.

However, you should go and get professional help on this issue, because you may be able to waive any taxes if you meet certain criteria.