PSB rebate backfile: four years to claim

Some Canadian charities have several years of unclaimed PSB rebates available within the CRA’s filing window. Recovering them starts with identifying each open claim period and filing the required forms.

How the backfile works

Outside Quebec administration, the PSB rebate can generally be claimed using Form GST66 and, where applicable, RC7066-SCH for the provincial part of HST. Revenu Québec administers most Quebec claims using its own forms. For a charity:

• Non-registrants generally have two claim periods per fiscal year.
• A non-registrant claim must generally be filed within four years of the last day of the claim period.
• A GST/HST registrant claim must generally be filed within four years of the GST/HST return due date for the claim period.
• A claim filed within the four-year window is processed and refunded; one filed after is generally barred.

In practical terms: calculate the window claim-period by claim-period before assuming a year is still open.

Why so many charities miss this

Several issues commonly lead to missed claims:

1. No GST/HST registration. Many small charities are not registered for GST/HST (because they’re below the small-supplier threshold) and assume the PSB rebate doesn’t apply to them. It does. Registration is not required.
2. Default chart of accounts. A bookkeeper running a generic chart of accounts often books GST/HST paid as a normal expense rather than tracking it as a recoverable. By year-end, the data needed to file is buried in expense detail.
3. Provincial portion forgotten. Charities in HST provinces (ON, NB, NS, PE, NL) sometimes claim only the federal 50% rebate and miss the provincial portion. Ontario’s 82% provincial rebate can make this omission especially significant.
4. Quebec filing route overlooked. Revenu Québec administers most GST/HST and QST PSB rebate claims in Quebec. The applicable forms and filing route should be confirmed before filing; selected listed financial institutions follow different rules.

How to backfile

For each open claim period:

1. Identify total GST/HST paid during the period from your accounting records.
2. Determine the federal portion and the provincial portion separately.
3. Use the applicable CRA or Revenu Québec form and electronic or paper filing route.
4. Apply the correct charity rebate rates by province (50% of the GST or federal part of HST; provincial rates vary).
5. Keep the source documents and calculation schedule with your books and records.

Estimate from the records, not revenue

The rebate is based on eligible non-creditable tax, not the charity’s revenue. A reliable estimate starts with invoice-level GST/HST, removes tax already recovered or claimable as an input tax credit or another rebate, separates federal and provincial components, and applies the rates in effect for each claim period.

What to do

If your charity has never claimed the PSB rebate, or claimed only the federal portion, or hasn’t filed in the past few years:

1. Pull GST/HST-paid totals for each claim period still in the four-year window.
2. Reconcile eligible non-creditable tax and apply the historical rates and place-of-supply rules for each period.
3. File the applicable CRA or Revenu Québec forms for each open claim period.
4. Set up monthly tracking going forward so this is no longer a backfile question.