You may be entitled to a tax refund if you:

• were entitled to the tax credit for children or the income under $9,880 tax credit for the 2012 tax year or earlier (find out more about tax credits)
• were entitled to the independent earner tax credit, but didn’t receive it all during the year from the 2010 tax year
• had more than one job during the year
• worked for only part of the year
• can claim expenses against your income.

Check it out on IRD website