The entirety of the note or mortgage often becomes due on notice of foreclosure. So in your situation, in order to become current, you would have to pay the whole balance of the mortgage plus any fees, and legal expenses incurred by the lender. Some of these fees may not be apparent to you, and you may need to contact the lender for full details.
If you've defaulted on forbearance agreement, you should have been receiving a few notices from your financial institution that is holding your mortgage. Those documents have an amount that you owe to bring you into compliance.
More often than not, your lender will likely prefer to try to sit down with you to work out a repayment plan/proposal, rather than having another foreclosure on their books.
Therefore, it would be advisable to call your lender as soon as possible to find out what steps you need to take to get this taken care of prior to sale date.
Wish you the best outcome and feel free to give us a call and we can provide a free consultation for you.
A.S. Foreclosure Defense Lawyers