Useful links and phone numbers:Register an account with CRA https://www.cra-arc.gc.ca/esrvc-srvce/tx/psssrvcs/menu-eng.htmlMake a payment to CRA https://www.cra-arc.gc.ca/mkpymnt-eng.htmlChild and family benefits https://www.cra-arc.gc.ca/bnfts/menu-eng.htmlPayroll deductions online calculator https://www.cra-arc.gc.ca/esrvc-srvce/tx/bsnss/pdoc-eng.htmlIndividual Income Tax Inquiries 1-800-959-8281Business Tax Inquiries 1-800-959-5525Canada Child Benefits 1-800-387-1193GST Credits 1-800-959-1953Canada Pension Plan (CPP) and Old Age Security (OAS) 1-800-277-9914Employment Insurance 1-800-206-7218Forms and Publications 1-800-959-2221