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Can an unmarried couple buy a home together with only one person on the mortgage?
It is highly unlikely that this would be approved by a mortgage underwriter.   When the bank gives a loan with a security interest in a property (a lien), they are protected - if the borrower does not repay the loan, the property can be foreclosed on and sold, and the lender is made whole for the amount of the loan that was not repaid.   When two parties are listed on the deed, then each owns an UNDIVIDED 50% share in the property.  If only one party has pledged the property as surety against the loan, then in effect only 50% of the property is forecloseable.  This means that the bank is unable to recoup its loss.   For a (fictional, highly simplified) concrete example, suppose that the house is worth $100,000 and Adam and Zoe are listed on the deed, but Adam is the borrower for a $100,000 mortgage.  Adam owes $100,000 and has an asset worth $50,000 (which he has pledged as security for the loan), while Zoe owes nothing and has an asset worth $50,000 (which is entirely unencumbered).  If Adam does not pay the mortgage, the bank would only be able to foreclose on his $50,000 half of the property, leaving them exposed to great risk.   There are other legal and financial reasons, but overall I think you'll find it very difficult to locate a lender who is willing to take that kind of risk.  It's very complicated and there is absolutely no up-side.   Also - speaking from experience (from which I was protected because of the bank's underwriting rules) and echoing the advice offered by others on this site: don't bother trying.  Commingling assets without a contract (either implicit by marriage or explicit by, well a contract) is going to get you in trouble.