@Account Closed Your CPA was probably referring to the effects of unestablished income on your credit. Schedule E income is still taxed in the year earned, unless you lock it up in a corporate entity (C-Corp, S-Corp, or Corp-LLC*).
There are other effects of using a corporate structure- some deductions which are capped for individuals (like depreciation, which cannot exceed income less all other expenses) but are not capped for corporations, so there are also times when such a structure is appropriate to capture those tax effects. There are also benefits (like the avoidance of taxation of long term gains on the taxpayer's primary residence) that are denied corporate structures, so choosing the right one for a particular scenario can be important.
*Corp-LLC- LLC that has elected to be taxed as a corporation, which involves the corporation recognizing income in the year it occurs, but the investor personally recognizing income in the year the corporate entity distributes it. Yes, income gets taxed both times, although the second time is at a preferential rate.
See the disclaimer in the earlier post. Let's save the planet by reducing digital waste. ;)