Changing the percentage ownership now has a number of potential problems, especially if the IRS views it as a tax avoidance/evasion strategy.

@Cody Tappan They put people in prison for tax evasion.

Remember, they couldn't get Capone on any of the stuff they really wanted to so tax evasion was the only thing to stick.

When you don't file, there might be a penalty for failure to file, and even worse they could try to say "tax evasion" ...

Actually, it's tax avoidance, not evasion, but I'm sure evasion is there as well.

He started being constantly late, very evasive.

If you know someone who's collecting rent and not reporting it on their tax returns they're committing tax evasion. 

He later served 10 years in prison for tax evasion.

Your creativity is setting you up for tax evasion if you use your inflated price to compute capital gains or calculate depreciation on a future tax return.  

Well, I'll say it, IRS Code requires a full accounting of all amounts exchanged in any real estate transaction, RESPA may or may not apply, the Code applies to any RE transaction.Buyer must account for fees and expenses paid to establish the correct basis in compliance with the Code.......unless you like taking chances of tax evasion, I suggest you show and report costs.A buyer can show an assignment fee on lines in the 200 section, summary of borrowers transactions, it can be shown "P.O.C." for paid out of closing.