In April each year you can claim a tax rebate for any donations made during the previous tax year (1 April to 31 March).
Just fill out an IR526 form for the tax year you're claiming on. You can fill out the form for the 2014/15 tax year online here. For earlier years go to the IRD website and enter IR526 into the search box.
You can only claim a tax credit for donations made within the last four years. That means you can't claim a tax credit for a donation made outside this time period.
You can't claim for payroll donations made through your salary and wages. You receive tax credits for this giving at the time of your donation.
Here's what you'll need to complete the claim form:
Your IRD number
Your bank account number
Receipts for donations
Why not claim your rebate, and donate that to HFNZ too? Because every little bit helps us to support our members and our programmes.