The terms for a 2nd position loan on a rental is 6%, 25 year term,  and 2 points origination fee.  

If you have a buyer's agent, you should have already signed a buyer's representation agreement and that fee/commission is disclosed in that document so you should very well know what that charge will be.If you were the seller and going to owner finance the property, what would you want to see from the buyer that tells you that they will be able to pay the mortgage moving forward. 

Tax liens2.

Hard money loans offer fast approval and don't risk personal assets but come with high-interest rates and fees, which can be tax-deductible as carrying costs.

The highest fee I've seen for assisting with tenant placement is 10% of one month's rent.

The fees and rate are generally higher on DSCR loans. 

(Late fees would be one example.)

Investing in a mortgage fund should not have tax implications for your Roth IRA since the investment is passive. 

Because a large percentage of the charges are base fees that do not change based on use!

You must have the Business tax license & pay all the fees required.