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How do I report this cash bonus/tip on income tax return?
Employers are not supposed to give cash gifts to their employees, even if you try to call it a "gift" for tax purposes. Presumably, the reason your wife's employer gave her cash was to be nice and save her taxes on that amount. Her employer already paid tax on that money so that your wife doesn't have to. If she plans to declare it anyway, then she should instead give it back and ask for it to be added to the W2 as an end of year bonus. This way her employer could then deduct the payment and pay her a larger amount of money. (The additional amount would be approximately their tax rate minus about 7.45% for FICA.) In fact, if your wife's tax rate is more than 15% lower than her employer's, then this is actually mathematically best for both parties.