Can my Ontario corporation use prior-year losses to offset salary or dividend payments now?

Corporate losses and personal salary or dividends operate in separate tax systems. A non-capital loss the corporation carries forward from a prior year offsets the corporation's taxable income in a future profitable year — it does not offset your personal income from salary or dividends. The carryforward stays inside the corporate entity.

When the corporation becomes profitable again, the loss carryforward reduces the corporate tax payable in that year. This means the corporation has more after-tax retained earnings to distribute to you as dividends or to fund salary payments. In that indirect sense, prior losses benefit you — they increase what the corporation has available to pay out.

From a compensation planning perspective, in a year when the corporation has large loss carryforwards absorbing its income, you might choose to take more salary than usual because the salary deduction further reduces corporate income that is already being absorbed by losses — the deduction has limited additional corporate tax value if income would have been covered by carryforwards anyway. Taking dividends in such a year instead might be slightly more efficient since the dividend does not reduce corporate income that was already sheltered. The practical difference is usually modest and depends on the exact amounts. Confirm with your accountant.