Timeframe tax refund
I did my tax return for 2014 over the internet in February 2015. I was wondering when I could expect the refund.
You should receive the refund before July 1, 2015. The tax authorities have begun paying out refunds for tax returns which were filed before April 1 2015. If you filed an M form because you migrated to or from the Netherlands in 2014 it may take the tax authorities longer to assess and pay out the refund due to the complexity of the tax return and the fact that it has to be processed on paper.
See also: http://www.expatax.nl/kb/article/when-can-i-expect-to-receive-my-tax-refund-93.html