You mentioned you make too much to contribute to a Roth.

Many advanced hosts here can contribute or learn from each other, even at the next level. 

Instead of contributing to retirement at work, put that money into the next house.

Clearly define each person's roles, contributions, and responsibilities.

Remember, the notion of amassing wealth without investing is a dangerous myth perpetuated by self-proclaimed experts.

I look at it through the lens of: 1) If I contribute to a pre-tax account like a pre-tax 401k, Traditional IRA, SEP IRA, I get a tax deduction, but now I'm in a partnership with the IRS, but I don't know what I will have to pay them later on in life when I start pulling money out (that is because when you distribute you pay taxes based on your effective tax rate at that time, which can be unknown). 2) With Roth accounts, (Roth IRA/Solo 401k(k) with Roth component), I can get the taxes out of the way on the seed, so I don't have to pay on the crop. 

Ensuring you're both onboard from the start will contribute to a smoother process and a happier investing experience.

Thank you for your contributions on this forum!

We put 12% down on the property at a 5.99% rate and contribute another $120 or so every month towards the principle. 

Good luck on your bidding.although this post was 10 years, i figured it's still very useful. thank you for whoever contributed to this topic.