Paula is granted a pay increase.

A payment made to “catch up” wages because a pay increase was processed late is a retroactive payment. The CRA provides different income tax calculation approaches depending on the payment type and specifically lists “Retroactive payments” as its own category, separate from regular tax-table calculations, lump-sum, and bonus/irregular methods.

For bonuses and retroactive pay increases, the CRA also points employers to the Payroll Deductions Online Calculator (PDOC) to calculate CPP, EI, and income tax correctly, which aligns with using the appropriate CRA method for retroactive amounts.

Because this situation is explicitly a retroactive adjustment (two pay periods late), the correct choice is the Retroactive tax method (option C), not the bonus/irregular method, not the lump-sum method, and not the regular tax tables.