I’m not exactly sure what you are referring to, but as everyone knows, Uncle Sam collects taxes everywhere he can.
I would consult with a knowledgeable accountant for the specifics to your question. Or check out the FAQ at the IRS site at www.IRS.gov.
A couple of things I do know is that you may be subject to the Alternative Minimum Tax. Also if you do not actively participate in your rentals (if that’s what your real estate investments are), you don’t get as many tax breaks.