The bill also proposes widening the definition of income to include interest and dividends for salary and wage earners. When calculating how much child support is payable, the incomes of both parents are used, but income from interest or dividends is not currently included in the calculation, simply because the amount of that income earned in a year is not known until the end of the tax year. The bill proposes introducing a four-year time bar for income reassessments, as currently exists for income tax. This would provide certainty for parents. The bill also includes a number of technical amendments, which will contribute to a better, more efficient child support scheme. These include proposals such as improvements to the estimation provisions to make them fairer.