Miranda Cosgrove My Career Was DOA After Tour Bus Crash

10/27/2014 12:15 AM PDT

Miranda Cosgrove has had a virtual career collapse which she says is all the result of 2 careless drivers ... a collapse that has cost her millions of dollars.

Cosgrove has just filed legal docs explaining why she's suing for so much money. She says the extensive injuries she suffered while on her tour bus that collided with a semi derailed 25 booked concerts, which would have netted her nearly $400,000. 

Miranda says she lost another $560K in future shows. But there's more. The "iCarly" star says Sony Music dumped her after the accident because they were counting on her touring.  And if that weren't enough, she says she lost a $400K Neutrogena contract as a result of her injuries.

All told ... Cosgrove's team says her losses could be as much as $2.5 million.