Payments made from 1 April 2012 for childcare and/or housekeeper payments are not eligible for a tax credit.
From 1 April 2014 you can only claim donation tax credits within a period of four years, following the year in which the gift was made. This means that donations made prior to 1 April 2016 can no longer be claimed.
Rather than rounding all tax credit refund amounts to the nearest cent, Inland Revenue stops at two decimal places. This means that if you work out a tax credit of $99.9999, your refund will show as $99.99.