Jeff,I concur, but would amend the above to say you must not just earn more than your cost of funds for the leverage to be beneficial, but more than your opportunity costs.Right now, we can borrow at prime (3%) from our corporate line of credit, or less if we place a mortgage.  

You may wish to confirm that the new 401k provider will handle the ongoing compliance support such as any required 5500 filing (e.g. 5500-EZ for a one-participant plan with assets in excess of $250,000), any required tax reporting (e.g. 1099-r in the event of a distribution or in-plan Roth conversion), mandatory plan updates and amendments, etc.4.

At this point, all of your prior year losses are unlocked and you can deduct them without limitation.After July 15th, I'd contact a knowledgeable real estate tax professional and have them amend your return. 

Blindly doing what you're thinking about doing via TurboTax because you read about it online is the stuff that amended returns and high CPA fees are made of."

If you have an accountant filing your taxes for you he will likely advise against trying to make any amendments. 

Do I HAVE to do the amendment for 2020?

Sometimes best to do this without too much time delay so that there aren't too many intervening posts between the original and the amended. 

Would this all just need to be completed on the amendment form? 

Mennem, May 13, 2013.An amendment to the Mexican Constitution, which has already been approved by the Chamber of Deputies, is currently in the hands of the Senate which could allow foreign ownership of beachfront property.

Sorry I need to amend my previous post as I was corrected by the genius of probate and deceased estates, Rick Harmon."