these days I recived a letter from em and it told me that my spouse could not have his/her gst / hst because I've already applied this for him/her,so in one family we can only have 1 GST/HST credit?
if I remember correctly, those with household income below $30,000 is elegible to apply GST/QST credit. Only one spouse can apply. better the lower income one to apply.