Personally, I would only move somewhere where you can do it on your own and not have to rely on that chunk of money as a down payment. Although in theory, it sounds like a great idea, it won’t be. Being in the financial industry, I would not recommend touching the 401k because of the taxes and penalties she will have to pay. I’m not sure what state you are in, but in CA, state and fed will average about 20-25% needing to be withheld. And she will be penalized on top of that because she is not of retirement age. That’s a lot of money to loose. If she takes out a loan, she’s going to have to check on a few things: 1) up to how much can she withdraw as a loan? 2) what will the payments be each pay period to repay the loan? 3) can she withdraw for a home purchase that isn’t hers (it won’t be in her name)? Also, there are so many more thousands of dollars more than just the realtor costs- make sure you’re prepared for that. I like where you’re going with the idea, but I personally would not rely on anyone else’s money to purchase the home. Too many things can go wrong and put you and your little family at risk. May I ask you this. can you put down 10%? I know a lot of people shoot for 20% down payment, but 10% may give you the flexibility for you and your husband to do it on your own. Then perhaps your mom can pay extra per month, which would have been part of her down payment anyway, and you apply the extra as principal only payment? For example, she would normally pay you $300, but now pays $600? Take the $300 extra and make an additional payment. And when you say the plan is for your husband to get on a loan with your mother. did you mean the two of them would be on the home loan? Or the 401k loan? Again, I wouldn’t have the two of them on the home loan. Who would reap the benefits when it comes time to file taxes because your mom and husband don’t file jointly. Then this would turn into more of a business venture and can get very messy. I would proceed with seeing what you and your husband can qualify for on your own. you’d be surprised how many loan programs are out there. It’s not cookie cutter like most think. The difference of her $30kish down payment would only be about $150/month when it comes to your mortgage payment.