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.
Shifting income to a later year, such as where you defer taxable interest to the following year by purchasing a T-bill or savings certificate maturing after the end of the current year. Investments in qualified retirement plans provide tax deferral.