Based on the purchase price, closing cost, agent fees and certain other items you will calculate (capitalize) a total number.

If cybercrime industry was a country in 2021, it would have been the world's third-largest economy after the U.S and China, totaling a 6 trillion USD in inflicted damages.

As a general rule of thumb it's smart to pay for 10 - 20% of the total costs (purchase price + rehab) out of your pocket and then finance the rest with hard money. 

Total hands off, perfect property, with awesome tenants who pay on time or early and never ask for any repair. 

I recommend at least 10%, and obviously, something closer to 20% is a lot better.Is the borrower going to live in the home, or is this an investment property?

If you're refinancing to a business purpose loan that's totally fine, but chances are good you'll need a lease in place for the unit you were occupying so the lender feels confident that it's strictly going to be used as an investment property.

Doing it that way also allows you to get a general idea of how much income is needed to at least be close to breaking even. obviously being close to the break even line is not where anyone wants to be but it is interesting and useful metric.

Obviously if the value is low that's one thing, but what if I pay and they deny me for some other reason?

I don’t focus on the total interest paid over time metric.

I totally agree.