First time 5500 ez for a 15 year old account

I have a one man Corp since 2003 and opened a 401k solo plan with fidelity. I am finding value of this portfolio crossed threshold of  250k. So I plan filing 5500EZ by March 15 i.e when I file company taxes.

How far back can IRS audit this? How will they know who much actually I deposited each year etc considering stock market changes and I lost money few years.  It should have been 250K in 13  years considering my deposit have been 20k each year. Is it normal for solo accounts?

Prior years' deposits/history don't matter.  You have to file when assets exceed $250K, period.

9 hours ago, Raj said:

How far back can IRS audit this? How will they know who much actually I deposited each year

They can go back as far as they want. They should know your deposits from your personal/corporate tax returns. 

interesting, at 20,000/year at the end of 2006 the balance would have been 80,000 without gains. at that time the EZ rule was a balance of only 100,000 so you missed out the filing requirement back then. the 250000 limit was effective 2007.

and the gains over the years have experienced some ups and downs, with 2017 being really good, so most likely this would indeed be the first year for filing.