Which of the following is NOT included in the IRS definition of "cash"?

The IRS definition of "cash" includes various forms of payment that can be readily used for transactions, focusing on items that are treated as cash equivalents for tax purposes. Cash on hand, credit card transactions, and wire transfers can all be directly used as means of payment in financial dealings, thus falling under the IRS's broader classification of cash.

Personal checks, however, do not fit neatly into this definition because they are not considered immediate cash. While personal checks can be deposited and converted into cash, they represent a promise to pay rather than cash itself until they are cleared and funds are transferred. This nuance is essential to understand when distinguishing between what constitutes "cash" in the context of IRS regulations.