Need advice on retroactive filing of 5500 (401k related)

[Maribel Manibo]

I used a Rollover for Business Startup (ROBS) to start my REI business a few years ago, rolling over 401k funds. I fell behind due to personal/health issues in filing the 5500 (3+ years) but my business also did not make money. How bad is this issue and what will it potentially cost me to get "caught up"? Does this affect the good standing of my company for transacting business or is it just considered back taxes? Would love referrals? I'm not even sure if I need a REI tax attorney, corporate tax attorney, CPA (REI versed) or something I'm not thinking off...