Michael Jackson Estate in Serious Tax Cheating Allegations

The Michael Jackson Estate is in the crosshairs of the IRS for allegedly cheating taxpayers out of a fortune ... and now the taxman wants the Estate to pay the piper -- to the tune of more than $700 million.

The allegations are stunning.  According to legal docs -- obtained by the L.A. Times -- when Michael died the executors told the IRS his net worth was
around $7 million.  The IRS now says MJ's net worth was actually $1.125 BILLION!  

And in a HIGHLY unusual move, the IRS claimed executors so grossly misled the agency, it doubled the tax penalty -- from 20 - 40%.  So the IRS claims the Estate didn't pay $505 million worth of taxes, and when you add the 40% it comes to more than $702 Million.

As for what the agency says was under-reported:

-- The Estate valued MJ's likeness at $2,105. The IRS says the value is actually more than $434 million.
-- The Estate valued Michael's interest in a trust that owns songs by MJ and the Beatles at ZERO!  The IRS says its more like $469 million.
-- There's another MJ trust the Estate claims is worth $2.2 mil.  The IRS says it's worth $60.6 mil.
-- The Estate valued the Jackson 5 master recordings at $11.2 mil.  The IRS says $45.5 mil.

It's pretty clear the Estate will fight this like crazy, but worst case scenario the taxes could wipe out what the Estate has made since MJ's death ... which could be devastating for Michael's kids.

TMZ