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 retirement plan that meets tax law tests and allows for tax deferment and tax-free accumulation of income until benefits are withdrawn. Pension, profit-sharing, stock bonus, employee stock ownership, and Keogh plans and IRAs may be qualified plans.