Canadian in the US on a TN & Majority owner of a CAD Cor

[SkyCielo]

I have read through the board and have been unable to find a situation such as mine.

I arrived to the US on April 20/07 as a visitor with the intent to stay in the US for a few months & return to Canada. I told the customes officer that I was a majority shareholder of a Corp in Canada & that I was planning a vacation in the US, however from time to time may need to work for my Canadian Corp while in the US. He had no problem with this & let me enter. While in the US I found a company to do some work for, spoke to a lawyer and she suggested and prepared the papers for a TN Visa. I left the US for a few weeks, returned Aug 25/07 & was granted the TN. The US Corp paid my CAD Corp for my services, and my CAD Corp paid me. I was expecting to file a 1040NR as I'd made several lenghty trips out of the US, but when I counted up my days in the US for 07, they are just over 183, so I'm deemed a resident for taxes.

I'm not sure what forms to file to the IRS, I believe I need to file Form 1040, and Form 5471 with schedules A,B,C,E,F,G,H,I,J,M & O, is that correct? Or are there other/better forms that I need?

At this point, I am sure that I'll be late, so I filed form 4868 for an extension, does anyone know if that extension will also cover form 5471?

Thanks in advance for any responses. Greatly appreciated!