Solo401K or HELOC to get re-started?

[Amy Charles]

My husband Michael and I want to jump back into RE investing, here in Austin, TX. We have previous experience having owned a duplex in Boston for 16 years which we house-hacked, rented long term, Airbnb'ed, converted to condos and sold off as individual units. We also renovated the Boston duplex top to bottom, and built our house here in Austin at the same time.

How should we fund the purchase of an investment property? Solo 401k could be an option as my husband is self employed in a solo photography business. (No other employees.) He has a large amount in rollovers and IRA's. Can he set up a Solo 401K and take out a loan from the Solo 401K? Is the cap for that loan $50K with interest around 6-7%? What companies do y'all use to set up your Solo 401K's? Our CPA was not able to help us with this, and directed us to find a company to set it up.

Also considering taking out a HELOC on our house. We own it outright, and it is worth around $600K.

We are looking to pull out or borrow around $220,000 to get started in the Austin area. We want to burrrr properties, or maybe flip. We are interested in single family residences, duplexes, and quad.

Would love recommendations on CPA's, LLC, Solo 401K set up, Title Companies, RE Lawyers, wholesalers, and hard money lenders in the Central Texas area. Any advice is welcomed. Thank you in advance!