Fuel tax credits and fuel tax adjustments are attributed to tax periods (or fuel tax return periods).

Generally, if you are a business taxpayer, your fuel tax credit for taxable fuel is attributed to the same period as your input tax credit for the fuel (to reduce compliance costs). If you are a non‑business taxpayer, your fuel tax credit for taxable fuel is attributed to the fuel tax return period in which you acquire, manufacture or import the fuel.

Fuel tax adjustments are attributed to the tax period (or fuel tax return period) in which you become aware of the adjustment.