Inland Revenue has modified the rules, again, on tax payment dates.
Previously, if the due date for payment was at a weekend or fell on a public holiday such as an anniversary day, you were entitled to pay on the next working day.
However, if you usually pay your tax electronically, the banking system still operates and therefore the time is not extended to the next working day.
If you pay physically at Westpac bank, you still get allowed that extra day.
Note April 7 is on Good Friday. Be sure to follow the new rules.