I was looking over the final numbers and I noticed that my gross salary for the last ten years and the gross profit on the house are close enough to be noticed.

Purchase price: $465,000 Cash invested: $80,000 Checkout my Airbnb here: airbnb.com/h/madeirabeachoasisSalt Water Pool & Hot Tub: $60,000Tiki bar with electrical hookup: $3,500Mural: $1600Interior Furnishings: $6,500Exterior Furnishings: $1,500Monthly gross booking revenue: $8,000-$12,000

You mentioned gross rents of $3400 per month and Principle/Interest/Tax/Insurance of $2500 per month. 

Purchase price: $465,000 Cash invested: $80,000 Checkout my Airbnb here: airbnb.com/h/madeirabeachoasisSalt Water Pool & Hot Tub: $60,000Tiki bar with electrical hookup: $3,500Mural: $1600Interior Furnishings: $6,500Exterior Furnishings: $1,500Monthly gross booking revenue: $8,000-$12,000

I recommend you budget 5% of the gross rent (for the whole place, even what the rent would be if you were living in it as a tenant) for repairs and 5% for capital expenditures.

Operating as short term rental by the bedroom, grossing $3500 - 5000/mo, between $500-1000 net.

Commercial Revenue Generating properties like office buildings, apartment buildings, retail centers, etc (banks call it "CRE" lending) are typically evaluated from their net operating income, not gross.

I lived in Madrid, Spain for about 8 months and I am curious if it is possible for non-residents to successfully have rental properties within the country.My concern is mostly from a tax standpoint and whether it makes sense.My research shows that Non-residents of Spain(but a resident of Europe) pay a flat rate of 19% on NET RENTAL INCOME.Non-residents of Spain(Not a resident of Europe, such as the USA) pay a flat rate of 24% on GROSS RENTAL INCOME.The difference of paying tax on Net and Gross is huge.Americans are not able to deduct expenses such as mortgage interest, taxes, insurance, cleaning, repairs, etcA pro that I can think about when it comes to invest in Spain is that overall costs are less - Mortgage rates are currently around 4% - 4.5% while it is around 6.5% - 7% in the US.Am I reading the tax law correctly?

Gross rents = $5,500.

You'll most likely still need a coborrower at first, but may be able to refi them out of the deal in a year or two once you have qualifying experience and operating history - then you can likely use all of the rental income towards your gross income.