u can still use the x5 as a business vehicle and take the one time deduction of 25k..(or 70% of that in u're case) Back as recent as 03 tax year u could take up to a 100k one time deduction...(on a side note a pick up with no back seat still qualifys for the 100k deduction...Anyways needless to say i've had 3 business vehicles in the past 4 years..lol.. my lastest is the srt8gc a definite keeper...

Besides i used to do my own taxes when i was w2 but i don't see how one can once self employed or s-corp(payroll,benefit plans,expenses,capital gains,futa, state unemployment) so just ask u're accountant.. Once u become self employed i think u're accountant truly does save u money by catching u're mistakes..

Also if u only claim that u're car is 70% business use then just buy a new business vehicle next year and claim 100% on that vehicle and retire u're current business vehicle to personal use... if u're gonna claim 100% business use then u really need a back up car but u might as well make u're back up car u're old business car...there is no limit on taking a 179 business vehicle deduction each year...again consult u're accountant

On u're taxes u can't really cheat on u're income but u can sure as hell maximise u're expenses-travel, insurance etc ,

Also u need to find an accountant that u're comfortable with...