Best way to shield W2 income from rental properties?

[Taylor Green]

Hi,

I was wondering what the best way to shield W-2 income from rental properties is? How much of a taxable loss could I create on a slightly positive cash flow property?

Also, does anybody have any experience of qualifying as a real estate professional when they have a regular W-2 job? I know the rules are strict, I was just looking to see if anybody was willing to share their experience in doing so. Thanks.