Use software or do ach through your bank.

@Hjiorst FjioordsHere are considerations in choosing a Solo 401k provider and bank to provide the account:Solo 401k Bank Account Considerations:Here are some general considerations:If you want access to bank checks, a debit card and/or the ability to ACH funds out, you will need a bank, credit union etc. rather than a brokerage.There are 100s of banks and credit unions that have opened accounts for a Solo 401k.Keep in mind that the bank's role is limited to simply providing the account (i.e. no tax reporting, no recordkeeping, etc.) such you may wish to de-prioritize familiarity with Solo 401k plans and focus on other things that are important to you (i.e. branch locations, fees, etc.).If you want the ability to invest in stocks, mutual funds, etc., you will need a brokerage account.Many brokerage firms will open "free" accounts (i.e. no setup fee, no maintenance fee), which will also come with checkbook access and the ability to wire funds out such that they function as a "hybrid" between a bank and/or brokerage account.If you are looking for names of banks that open bank accounts for Solo 401k plans, there are many banks where we have received positive feedback including Wells Fargo, Bank of America, PNC along with local banks and credit unions just to name a few.

Can anyone give me some recommendations, or banks/credit unions that have caused them head aches?

Sacrifice the GI trips to Apple Bees and muscle cars.

Oh I love his phrase "You listened to people - you  made a huge mistake" - with his muscled face.

The successful bidder must pay for the taxes, interest, tax sale costs and any high-bid premium, by ACH Debit not later than 5:00 p.m. the day of the auction.

I'm kinda going through a similar issue but I used an HVAC guy that's driving around in a van. 1400$ and over a month and I still got no ac and a lot of head ache.....

We have been using ACH though our bank for many years and it works great for the most part.

What type of payment was it (ACH, credit card, etc.)?

I would make sure you really want another lease as you may want to feel out the people for a while and then start to muscle the 1 or 2 that don't pay timely and try to leave those other tennants alone, if possible.