Traditionally I have always done my own taxes, but now that our portfolio has more than doubled (also looking at a duplex in the Spring), I am in need of someone who really knows the intricacies of real estate tax laws to maximize our return for years to come.

Traditionally I have always done my own taxes, but now that our portfolio has more than doubled (also looking at a duplex in the Spring), I am in need of someone who really knows the intricacies of real estate tax laws to maximize our return for years to come.

Compared to an IRA, Solo 401k contributions limits are roughly ten times higher.There is no custodial requirement for the 401k.You don't need the additional expense and administration of an LLC to have checkbook control.You can borrow up to $50k from the plan; IRAs do not allow for participant loansThere is a built in-Roth component whereas IRAs are either traditional or Roth, not both.A spouse can also participate in the same Solo 401k plan.The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.The penalties for prohibited transactions are less severe, though it's best not to utilize this benefit :)

I compare that to people I know that are successful in their jobs but just can't get over the fear of the unknown to become real estate investors.There are well known people that did not go through college education to be successful, but there are also a large number of others that did not help themselves by lacking one.

I know this because we regularly price shop and compare with our competition. 

Then compare the two to see if the deal is a good deal. 

I understand the mortgage rates are lower for second home compared to investment property.If I decide to rent this property in the future for any reasons (airbnb or leased), is that illegal?

Great foundation, but will not compare to real world experience.

First, Rentometer is great for a ball-park figure, but it doesn't take into account a lot of information on the house (type [SF vs. duplex], square footage, condition, finishings, etc.)I would recommend reviewing rental listings on Zillow/Craigslist that are comparable to your in-laws house so you can get a better idea of what rents would be. 

how do the tenant laws compare?