Taxable regular income rules limit nonprofit tax when most income is applied or accumulated for charitable or religious purposes. Taxable regular income for a registered non-profit organisation is determined by the extent to which its regular income for a tax year is used for charitable or religious purposes; if a substantial portion is applied or accumulated for those purposes in the tax year, taxable regular income is nil, otherwise taxable regular income is the regular income reduced by the portion applied or accumulated for charitable or religious purposes and a prescribed proportion of the remainder is treated as taxable.