Spring Tax Prep Checklist for Calgary Business Owners

Spring means tax season for Calgary business owners. Whether you file your own returns or work with an accountant, being prepared makes the process faster, cheaper, and less stressful. Here is your spring tax-prep checklist for 2026.

1. Confirm Your Books Are Current Through Year-End

Your bookkeeping for the prior fiscal year should be fully complete: all transactions categorised, all bank and credit-card accounts reconciled, and year-end adjustments recorded. If you are behind, prioritise catching up now — your accountant cannot file accurate returns from incomplete records.

2. Gather All Tax Slips and Documents

Collect T3, T4, T4A, T5, and RRSP contribution slips. For business returns, assemble your income statement, balance sheet, and details of any capital asset purchases or disposals during the year. Having everything in one place before you start saves significant time.

3. Review Your Deductions

Walk through your expense accounts and ensure all legitimate deductions are captured. Commonly missed deductions include: professional memberships, home office expenses, vehicle mileage, conference and training costs, and bank fees. Each missed deduction costs you real tax dollars.

4. Reconcile Your GST

If you file GST annually, reconcile total GST collected against total GST remitted for the year. If you file quarterly, verify all four quarters were filed and the totals are consistent with your annual revenue.

5. Check Your CRA Account

Log in to CRA My Business Account and review your account status. Look for any outstanding balances, missed filings, or notices you may not have seen. Addressing these before filing your current return avoids complications.

6. Coordinate With Your Accountant Early

Accountants are busiest between March and June. Delivering clean, organised records early means your return gets filed sooner, and you avoid the last-minute rush that often leads to errors or extensions.

7. Plan for Balance Owing

If you expect to owe tax, plan for the payment now. Personal tax balances are due April 30 regardless of your filing deadline. Corporate tax is due two or three months after year-end depending on your structure.

Castle Makes Tax Prep Simple

Castle Bookkeeping clients receive a complete, tax-ready financial package every year. Our monthly bookkeeping ensures your records are always current, so tax season is just a handoff — not a scramble. Contact us for a free consultation.