401 k Combined with Simple IRA, SEP IRA

[Chai Jonn]

Hi all,

I am planning to invest into Real Estate from SDIRA LLC or Solo 401k LLC. I as of now have a SDIRA. This year and next year I am getting self-employment income on 1099. I like to contribute as much as I can tax differed to the retirement accounts like solo 401k, IRA etc. I know that I can contribute to

Solo 401k $18500 + 20% Employer contribution

$5500 towards Traditional or Roth IRA

And then there are SEP IRA, SIMPLE IRA etc

I am wondering what combination of retirement accounts gives me the maximum contribution to the retirement accounts.

Can I do

Solo 401k + SIMPLE IRA

Solo 401k + SEP IRA

Please advice

Thanks

Chai