Company Tax Filing Guide: What You Need to Know

Jun 9

5 min read

Updated: Jul 31

Many businesses set their year-end date to December. This means the tax filing deadline for most companies is fast approaching! If your year-end falls in December, then June 30th is your tax filing deadline.

Many business owners mistakenly believe that "if the company isn't making money, it doesn't need to file taxes." This is a misconception. Others think, "I'll have to hire an accountant anyway, so I don't need to worry about it." However, without understanding the procedures, you might overpay taxes, miss out on deductions, or even face fines.

Understanding the Tax Filing Process

In this article, you will learn about:

The three core components of the T2 tax form
The complete process from financial statements to tax adjustments
A general schedule used by 80% of small and medium-sized companies when filing taxes
Compliance Timeline: When is payment due? When is the deadline?

If you understand this article, you can at least break even with the accounting fees you save. You will also feel more confident when communicating with your accountant.

I. The Three Main Components of a Company Tax Return

Understanding the T2 tax return is crucial. It consists of three main components:

| Part | Content | Common Name |

|------|---------|-------------|

| One | T2 main table (first 9 pages) | Main Form |

| Two | Various appendices (Schedule 1–8, etc.) | Appendices |

| Three| Financial Statements (GIFI) | Financial Data |

If you use certified tax preparation and accounting software (such as TurboTax, FutureTax, or T2 Express), most calculations will be done automatically. However, you need to know where the numbers come from and where they go.

Important Note: Do not submit your taxes by paper anymore! Doing so will result in a penalty of up to $1,000!

II. Filling in the Company's Basic Information

Key Field Interpretation (Common Mistakes)

When filling out the first 9 pages of the T2 main form, pay attention to these key fields:

BN (Business Number): This is a 9-digit number. Note that RC = Corporate Tax, RT = GST/HST, and RP = Payroll Deductions.
Company Type: Most privately owned small businesses are CCPCs (Canadian controlled private corporations).
Year-end: For example, December 31st → Application period: January 1st – December 31st.
Change of Ownership: If more than 75% of shares are transferred within the year (at fair market value), the "Acquisition of Control" box must be checked.
Main Products/Services: Enter an approximate percentage; it doesn't need to be exact.
Installments: If you have already prepaid taxes this year, be sure to enter this field; otherwise, the CRA may assume you haven't paid.

💡 Practical Tip: When using tax software, the previous year's data will be automatically carried over. Still, verify the address, contact person, and email address to avoid the CRA sending emails to the wrong address.

III. Preparing Financial Statements (GIFI)

1. Balance Sheet (G100)

Taking ABC Company as an example (December 31, 2025):

|------------------------|----------|------------------------|----------|

| Cash | $10,000 | Accounts Payable | $5,000 |

| Accounts Receivable | $3,000 | Loan Payable | $20,000 |

| Prepaid | $3,000 | Total Liabilities | $25,000 |

| Stock | $30,000 | Total Equity | $296,000 |

| Original value of fixed assets | $60,000 | | |

| Less: Accumulated Depreciation | ($10,000) | | |

| Net income for the year | $29,350 | | |

| Total Assets | $296,000 | Total Equity | $296,000 |

Note: Accumulated depreciation in the software is usually entered as a positive number, but the system will automatically treat it as a negative number.

2. Income Statement (G125)

| Project | Amount |

|-----------------------|----------|

| Sales Revenue | $200,000 |

| Less: Cost of Sales | ($100,000) |

| Gross Profit | $100,000 |

| Investment Income | $500 |

| Canadian Company Dividends | $6,000 |

| Proceeds from Sale of Stocks | $5,000 |

| Less: Expenses | ($82,150) |

| Accounting Net Income | $29,350 |

Key point: Net accounting income ≠ taxable income; the difference is adjusted using Schedule 1.

IV. Key Appendices Explained

✅ Schedule 1: Accounting Revenue → Taxable Revenue

| Adjustment Items | Amount |

|-----------------------|----------|

| Accounting Net Income | $29,350 |

| Add back: Accounting Depreciation | $2,000 |

| Add back: 50% for Dining and Entertainment | $5,500 |

| Less: CCA (Tax Depreciation) | ($1,000) |

| Less: Tax-free Dividends | ($6,000) |

| Taxable Income | $29,850 |

💡 Net income before tax = Accounting net income + Non-deductible expenses - Tax-exempt income - Additional depreciation, etc.

✅ Schedule 3: Dividend Details

Dividends received between Canadian companies are tax-exempt, but must be disclosed. If dividends come from unrelated portfolio companies, they may trigger Part IV tax (which is refundable).

✅ Schedule 4: Loss Carryforward

Non-capital loss: Can be offset against income from any source.
Capital Loss: Can only be offset against capital gains.
Losses can be carried forward for 3 years and forward for 20 years.

✅ Schedule 6: Asset Sale (Capital Gains)

| Project | Amount |

|-----------------------|----------|

| Selling TD Bank Shares | $16,000 |

| Less: Cost | ($11,000) |

| Capital Gains | $5,000 |

| Taxable Portion (50%) | $2,500 |

The $2,500 will go into the "Taxable Capital Gains" line of Schedule 1.

✅ Schedule 7: Differentiate Between Investment Income and Active Operating Income

| Income Type | Amount |

|-----------------------|----------|

| Property Income | $500 |

| Taxable Capital Gains (50%) | $2,500 |

| Total Investment Income | $3,000 |

This portion is taxed at a high rate (approximately 50%) but can be recovered in the future through a dividend tax refund (RDTOH).

✅ Schedule 8: Tax Depreciation (CCA)

Tax depreciation (CCA) is not mandatory. If your income is low in a given year, you can accrue less or even none at all, reserving the amount for future use.

V. Practical Exercise: How to Fill Out Tax Return Forms in the Software

Suggested Operation Order:

Fill in the GIFI (balance sheet + income statement) → Schedule 1 data will be automatically generated.
Enter Schedule 8 (CCA Depreciation) → Automatically adjust Schedule 1.
Fill in Schedule 6 (Capital Gains) + Schedule 3 (Dividends).
Check Schedule 7 → Ensure investment income and active income are correctly categorized.
Check Schedule 1 → Is the taxable income reasonable?
Complete the disclosure appendices (50, 9, 11, etc.).
Return to the T2 master table → Confirm Part I and Part IV taxes and installment payments made.
Electronic submission (NETFILE).

VI. Important Timeline: When Should I Pay?

| Year-end | Application Deadline | Tax Payment Deadline (if any) |

|-----------------------|----------------------|-------------------------------|

| December 31 | June 30th of the following year | Installment payments: March, June, September, and December 15th; balance due April 30th. |

Key reminder: Tax due dates are earlier than the filing deadline. If you anticipate having to pay taxes but haven't opted for installments, the CRA will charge daily compound interest.

Example: ABC Company owes $3,000 in Part I taxes. If it is not paid by April 30th and is only paid together with the tax return on June 30th, the interest from April 30th to June 30th will still be calculated (approximately 4-6% annual interest).

VII. Practical Advice on Company Tax Filing

✅ If You File Your Taxes Yourself (Using Software)

Keep last year's tax return as a template.
Verify GIFI against your accounting records line by line.
Confirm the use of CCA categories (avoid double depreciation).
Beware of catering and entertainment expenses: only 50% is deductible.
Make sure the installment payment amount has been entered correctly before submitting.

✅ If You Hire an Accountant

Prepare a clean trial balance and a detailed list of fixed assets in advance.
Provide a list of affiliated companies (affecting the $500,000 limit allocation).
Provide details of shareholder loans (to avoid being seen by the CRA as hiding dividends).
Check the "follow-up" issues in Schedule 141—if there are large transactions that occur after the year-end but before filing taxes, disclosure is required.