Keeping money to the end of the year won't have any more tax drawbacks, any income you can not deduct, towards expenses, would be taxed. one way to not owe the tax at the end of the year is if you sell a property and do a 1031 exchange ( like kind exchange ).

A benefit to you when you occupy a property for any 2 out of 10 years, is that the property increases in value over time, and you can exclude the capital gains from taxation. 

@Steve Vaughan There's a very good point you make regarding the taxation issues, if you rent for 12 months and a day, 366 days, your taxation when you sell (what the IRS charges you)  is a lot less then if you sell quickly (less than 12 months)See your CPA

However, by virtue of the US/UK treaty for the avoidance of double taxation, you could credit the income and capital gains taxes paid to the UK against your US income and capital gains taxes.

@Sunil ChataniDepending on how the LLC's are structured, they may or may not require an separate tax filing.Since you are a real estate agent, you also want an accountant who is familiar with business taxation since being a real estate sales person is a business.There are a couple of CPA's on the messageboard.

Do they also specialize in real estate taxation?

But it doesn't impact any taxation.  

I recommend finding an accountant who specializes in real estate taxation over one that is local.

Your best best is to find a CPA who specializes in real estate that is also familiar with the state laws where you are a resident of.People think that there are only a select few amount of CPA's that specialize in real estate taxation.Real estate investing and the taxation revolving them is as old as time.You may be able to find a local CPA that specializes in real estate taxation at a REIA meeting.You can also a CPA by networking with other investors within your state and asking who they use.Best of luck!

Marcelle,You will want to connect with a CPA who understands real estate taxation(especially involving STR's) and multi-state taxation as you have investments in multiple states.Best of luck to you in your search.