Tax Filer Tip: This calculator applies the Basic Personal Amount (BPA) tax credit (approx. $15,705 for 2026) which lowers your total tax owed. If your employer deducted more tax in Box 22 than your actual calculated tax liability, you get a Refund. If they deducted too little, you will have a Balance Owing. Add RRSP contributions to your actual tax return to increase your refund even more!