Okay, then each get an attorney and draft a prenup. The prenup specifies the current equity in the house as your asset that remains yours. In the divorce you’re planning, you keep that equity, and any further equity is divided equally between you. You each keep your investment balances as of the date of the wedding, and balances created during the marriage are split.

Or even better, sell the house, you keep the proceeds, then buy a new house together and each put in equal amounts.

But you really do need to consider whether 50/50 is always fair and whether it will always work. What if you become disabled or partner gets leukemia or one of you is sued and loses a million dollar judgment or partner’s child needs a kidney transplant and can’t pay for it or you get burned out doing your six-figure job and need six months off or to become a kindergarten teacher or youth pastor for a 75% pay cut. There are reasons why married couples have traditionally pooled their assets and budgeted together.