If you use a dwelling unit as a residence and rent it for fewer than 15 days during the year, you don’t report any of the rental income; it’s tax free. But you can’t deduct any expenses as rental expenses.
A portion of earnings withheld by an employer or put into a retirement plan for distribution to the employee at a later date. If certain legal requirements are met, the deferred amount is not taxable until actually paid, for example, after retirement.