Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

How do I calculate ownership percentage for shared home ownership?
Once your sister and you make your first payments, you've paid $20,645, and your sister has paid $1400. But your sister also owes rent. Zeroth order estimate for rent is that it's equal to mortgage payment, so that's $2045 (I assume that $2045 is actually your total payment, not just your escrow payment. Unless I'm misunderstanding what the term means, $2045 is an absurdly high amount for a monthly escrow payment.) So your sister now has made a net capital contribution of ... negative $645. So you're giving your sister a gift of $7740 each year, and are the sole equity owner of the house. There's a $14000/year gift tax exclusion, and I think that both you and your husband can claim it separately, so every year you could declare your sister to have $20260 added to her capital contribution, or more if you're willing to pay gift tax. But as it stands, if there are any losses from the property, they will be borne exclusively by you; therefore, any profits should be enjoyed exclusively by you. Any other arrangement is you giving a gift to your sister. If the price of the house were to shoot up to $1,000,000 after a year, and you were to split the profits with your sister 50:50, and not pay a gift tax, you WOULD be violating tax law.