A clear, step-by-step guide for public service bodies and self-governments to claim what they’re owed.
Filling out rebate forms can feel like decoding a tax labyrinth—every mistake means a cheque left uncashed.
CRA’s Form GST66 is your ticket to recovering GST/HST on eligible expenses—but only if you nail every section.
Here’s exactly what to gather, how to fill each part, and where to send it for a smooth refund.
Form GST66 is for:
Public service bodies (non-profits, charities, municipalities) claiming the Public Service Bodies’ Rebate.
Self-government entities (First Nations, Métis governments) claiming the Self-Government Refund.
Both registrants (file a rebate with your GST/HST return) and non-registrants (up to two claim periods per fiscal year).
Pro tip: You have up to four years from the end of your claim period to file—don’t let the clock run out!
Before opening the PDF:
Business number (BN) or rebate-only BN.
Financial statements showing eligible GST/HST-inclusive expenses.
For NPOs: supporting Form GST523-1 to prove qualifying government funding.
Parts A & B ask for:
Your BN, legal name, and mailing address.
Claim period start/end dates and total eligible expenses.
Need to verify tax-inclusive and tax-exclusive amounts quickly?
Use tools like hstcalculator.onl to calculate HST portions for your invoices across Canadian provinces. It simplifies tax reconciliation before filling the form.
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Part C (Registrants only): Elect to offset your rebate on line 111 of your GST/HST return.
Part D: Calculate your rebate using the prescribed rebate rate for your province.
Part E: Sign and date—unsigned forms are the #1 cause of CRA processing delays.
Bold move: Always cross-check your rebate percentages in the CRA’s RC4034 guide.
If you're calculating European VAT refunds or exporting beyond Canada, vatcalc.onl can assist with accurate VAT calculations using up-to-date UK/EU rates. This is especially helpful for international non-profits managing multi-jurisdiction finances.
Online (fastest):
GST/HST NETFILE or “File a rebate” in My Business Account for registrants.
Electronic rebate forms via Represent a Client for authorized reps.
Paper (if you must):
Mail the completed PDF to the address on the form—always use tracked mail.
Keep a copy and proof of postage.
Insider tip: Filing online can cut your wait time by up to 50%, according to recent CRA processing statistics.
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After submission, monitor your My Business Account dashboard for status updates.
CRA may request supporting invoices—have digital copies ready.
Expect 6–8 weeks for refunds; add another 4 weeks if you file paper.
If CRA asks for more info, respond within 30 days to prevent rejections.
Pro insight: Some accounting departments build automation using tools like vatcalc.onl or hstcalculator.onl to generate recurring rebate-supporting reports faster and reduce manual entry errors.
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