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What things should I consider when getting a joint-mortgage?
This is more of a long comment but may answer user's situation too. I have dealt with joint mortgages before in 3 states in the US.  Basically in all three states if one party wants to sell, the home goes up for sale.  This can be voluntary or it can go up via auction (not a great choice). In 2 of the 3 states the first person to respond to the court about the property, the other party pays all legal fees.  Yes you read this right.  In one case I had an ex who was on my mortgage, she had no money invested in the house ($0 down and still in college with no job).  [If she wasn't on the mortgage I wouldn't have gotten loan - old days of dumb rules] When we split her lawyer was using the house as a way to extort other money from me.  Knowing the state's laws I already filed a petition for the property but put it on hold with the clerk.  Meaning that no one else could file but if someone tried mine would no longer be on hold.  My ex literally spent thousands of dollars on this attorney and they wanted to sell the house and get half the money from the house.  So sale price minus loan amount divided between us.  This is the law in almost every state if there is no formal contract.  I was laughing because she wanted what would be maybe 50-75K for paying no rent, no money down, and me paying for her college. Finally I broke her attorney down (I didn't lawyer up but had many friends who were lawyers advising).  After I told her lawyer she wasn't getting anything - might have said it in not a nice way - her lawyer gave me her break down.  To paraphrase she said, "We are going to file now.  My assistant is in the court clerk's office.  You can tell the court whatever you want.  Maybe they will give you a greater percentage since you put the money down and paid for everything but you are taking that chance.  But you will pay for your lawyer and you will need one.  And you will pay for me the entire time.  And this will be a lengthy process.  You would be better served to pay my client half now." Her office was about 2 blocks from court.  I laughed at her and simply told her to have her assistant do whatever she wanted.  I then left to go to clerk's office to take the hold off.  She had beat me to the office (I moved my car out of her garage).  By the time I got there she was outside yelling at her assistant, throwing a hissy fit, and papers were flying everywhere.  We "settled" the next day.  She got nothing other than the things she had already stolen from me.  If I wouldn't have known about this loophole my ex would have gotten or cost me through attorney's fees around 40-50K for basically hiring a lawyer.  My ex didn't really have any money so I am pretty sure lawyer was getting a percent. Moral of the story: In any contract like this you always want to be the one bringing in the least amount of money.  There are no laws that I know of in any country where the person with the least amount on a contract will come out worse (%-wise).  Like I said in the US the best case scenario that I know of for joint property is that the court pays out the stakeholder all of their contributions then it splits things 50/50.  This is given no formal contract that the court upholds.  Don't even get me started with hiring attorneys because I have seen the courts throw out so many property contracts it isn't even funny.  One piece of advice on a contract if you do one.  Make it open and about percentages.  Party A contributes 50K, Party B 10K, Party A will pay this % of mortgage and maintenance and will get this % when home is sold.  I have found the more specific things are the more loopholes for getting out of them. There are goofy ass laws everywhere that make no sense.  Why would the person first filing get their lawyers paid for???  The court systems in almost all countries can have their comical corners.   You will never be able to write a contract that covers everything.  If the shower handle breaks, who pays for it?  There is just too many one-off things with a house. You are in essence getting in a relationship with this person.  I hear others say it is a business transaction.   NO.  You are living with this person.  There is no way to make it purely business.  For you to be happy with this outcome both of you must remain somewhat friends and at the very least civil with each other.   To add on to the previous point, the biggest risk is this other person's character and state of mind.  They are putting in the most money so you don't exactly have a huge money risk.  You do have a time and a time-cost risk.  Your time or the money you do have in this may be tied up in trying to get your money out or house sold.  A jerk could basically say that you get nothing, and make you traverse the court system for a couple years to get a few thousand back. And that isn't the worst case scenario.  Always know your worst case scenario.  Yours is this dude is in love with you.  When he figures out 2-3 years later after making you feel uncomfortable the entire time that you are not in love with him, he starts going nuts.  So he systematically destroys your house.  Your house worth plummets, you want out, you can't sell the house for price of loan, lenders foreclose or look to sue you, you pay "double rent" because you can't live with the guy, and you have to push a scooter to get to work. That is just the worst case scenario.  Would I do this if I were 25 and had no family?  Yea, why not if I trusted the other person and was friends with them?  If it were just a co-worker?  That is really iffy with me.    Edit: Author said he will not be living with the person.  So wording can be changed to say "potentially" in front of living with him in my examples.