NEW YORK ( Credit.com) --Want to be 100% responsible for someone else's obligation? Then co-sign for them on a mortgage -- and you'll be just as responsible for repaying the obligation as they are, even though you are co-signing to simply help the other party. When you co-sign on a big-ticket item like a mortgage, you are in essence lending a portion of your future income and credit worthiness for the benefit of someone else's obligation. Doing so requires meticulous consideration to every detail of the terms, as well as a potential exit strategy. Here are some facts about co-signing on a mortgage you should fully understand before you commit: Relationship doesn't matter, although it helps. When you co-sign to help somebody else qualify for a mortgage, the relationship between you and the primary borrower taking out the loan doesn't matter as long as it's fully explained and documented. Typically, it's immediate family or blood relatives who co-sign for another family member -- e.g. parents co-sign for their kids to buy their first home. Someone else's choices shape your chances. Let's say you helped your brother buy a home a few years ago by co-signing for him. But now he has fallen on tough financial times and subsequently has not been able to make his house payment obligation, resulting in a negative mark on his credit report. This delinquency will appear on your credit report as well, as you have just as much obligation on his liability as he does. Remember that the responsibility to make timely payments per the mortgage note -- no matter how the title is held -- is still 50/50 between parties. All parties are conjoined. The person who you co-signed for will have to pay off the mortgage by means of refinancing you off the mortgage, or by selling the property, which pays off the note. You may want to consider living together. You don't have to live in the property you are co-signing for, referred to as a non-occupant co-borrower. However, if all parties purchase and live in the house of their primary residence, there is a greater level of transparency of financial status amongst the borrowers, which could mitigate difficulties down the road. Your borrowing power will be reduced. Planning to take out another mortgage? Your ability to get another mortgage, another credit card, another auto loan, etc., will be hindered to the extent of how much of your income and liabilities are being used for the benefit of the person you originally co-signed for. Simply put, to co-sign for someone else reduces your chances of qualifying for future credit obligations.