The form below is found on the Cra site. Please click and print and send by mail this form.
http://www.cra-arc.gc.ca/E/pbg/tf/t1158/t1158-15e.pdf
Here is more information on this subject. Click on links below to learn more.
https://turbotax.intuit.ca/tax-resources/dependant-tax-expenses/filing-spousal-support-orders-to-cla...
http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/ncm-tx/spprtpymnts/rgstrng-eng.html