
In Ontario, Canada, common-law relationships are legally recognized and have implications for tax purposes. Unlike some other countries, Canadian tax rules do not allow spouses or common-law partners to file joint income tax returns. Each individual must file their own tax return, indicating their marital status and providing information about their spouse or common-law partner if applicable. The definition of a common-law relationship varies across provinces, but generally, it is defined as when two people live together in a conjugal relationship for 12 continuous months or immediately if they have a child together. For tax purposes, it is considered tax fraud to fail to disclose a common-law relationship or provide incorrect information, as it can impact tax benefits and credits.
| Characteristics | Values |
|---|---|
| Definition of common-law partnership | Living together in a conjugal relationship for the last 12 months or living with the person with whom you share a child by birth or adoption |
| Common-law partnership and tax fraud | If you are legally in a common-law partnership, it is considered tax fraud to file as single without claiming your accurate common-law status |
| Filing jointly | Common-law couples in Canada are not allowed to file a joint return; instead, they each file single returns and mark that they’re in a partnership |
| Tax benefits | Income splitting, combined deductions and credits, Canada Child Benefit, and the goods and services tax/harmonized sales tax (GST/HST) credit |
| Disadvantages of filing as common-law | Ineligibility for certain tax credits, including the GST/HST credit, Canada Child Benefit, Guaranteed Income Supplement, and Working Income Tax Benefit |
| Separation | To be considered officially separated, common-law partners must live apart for at least 90 days |
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What You'll Learn

Common-law relationship definition
In Canada, common-law relationships are legally recognised and considered equivalent to marriage for tax purposes. This means that common-law partners must disclose their relationship status and details about their partner on their tax returns.
The definition of a common-law relationship varies slightly across different provinces in Canada. However, according to the federal Income Tax Act, a couple is generally considered to be in a common-law relationship if they have lived together in a conjugal relationship for at least 12 months. Alternatively, if a couple has a child together, they are immediately considered common-law, regardless of how long they have lived together. Additionally, if a couple lives apart for reasons other than the end of their relationship (such as work, education, or medical reasons), they are still considered common-law by the CRA.
To be officially considered separated by the CRA, a couple must live apart for at least 90 days due to a breakdown in their relationship. During the year of separation, the claiming spouse's tax return is calculated using their partner's net income before the date of separation.
Failing to disclose a common-law relationship on tax returns can have serious consequences, including tax fraud charges, reassessment for unpaid taxes, and denial of certain benefits.
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Tax fraud risks
In Ontario, Canada, common-law relationships are legally recognized and have specific implications for tax purposes. While common-law couples cannot file joint tax returns, they must disclose their relationship status and their partner's information on their individual tax returns. Failure to do so is considered tax fraud and carries significant risks and consequences.
- Reassessment and Penalties: If you are in a common-law relationship and do not disclose it on your tax return, the Canada Revenue Agency (CRA) may reassess your returns. This can result in paying additional taxes, along with interest and penalties. The CRA may impose these penalties if they determine that you intentionally misrepresented your relationship status to avoid paying higher taxes or to maintain certain benefits.
- Denial of Benefits: By not disclosing your common-law status, you risk being denied important benefits such as the Canada Pension Plan (CPP) and other pension survivor benefits. These benefits are often crucial for financial stability, especially in the event of the death of a spouse.
- Loss of Credits and Deductions: Common-law partners may be eligible for various tax credits and deductions, such as combining medical expenses, charitable donations, and transferring unused tax credits. By not declaring your common-law status, you may lose the opportunity to take advantage of these credits and deductions, potentially increasing your tax burden.
- Impact on Government Credits: The CRA determines government credits and benefits based on household income. As a common-law couple, your combined income may affect your eligibility for credits such as the GST/HST credit, Canada Child Benefit (CCB), and other benefits. Failing to disclose your common-law status may result in receiving credits or benefits that you would not have qualified for otherwise.
- Legal Consequences: Tax fraud is a serious offence and can have legal repercussions beyond the financial penalties mentioned above. In extreme cases, individuals may face legal consequences, including fines or even criminal charges.
It is important to understand the definition of a common-law relationship in Ontario, which typically requires living together in a conjugal relationship for at least twelve months or having a child together. By being informed about the tax fraud risks associated with misrepresenting your common-law status, you can ensure compliance with tax regulations and avoid unnecessary financial and legal consequences.
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Tax credits and benefits
In Canada, common-law couples are treated as married for tax purposes. While each partner must file their own tax returns, they must indicate their relationship status and include their partner's information, such as their name, Social Insurance Number (SIN), net income, and employment status.
Being in a common-law relationship can impact your tax situation, including your eligibility for certain credits and benefits. Here are some key tax credits and benefits to consider:
- Income splitting: Common-law partners can reduce their overall tax burden by splitting income between themselves. This strategic tax planning can result in lower overall taxes and increased benefits.
- Combined deductions and credits: By combining or transferring credits, such as spousal amount, medical expenses, and charitable donations, common-law partners can maximize their tax savings.
- Canada Child Benefit (CCB): If one spouse has a low or no income, claiming this benefit based on combined income can increase the total benefit received.
- Goods and Services Tax/Harmonized Sales Tax (GST/HST) Credit: Your eligibility for this credit may change when you enter into a common-law relationship.
- Spouse or common-law partner amount: If one spouse supports the other, and their net income is below a certain threshold, the supporting spouse may receive a tax credit.
- Medical expenses: Common-law partners can combine their medical expenses to potentially increase their tax refund.
- Education credits, Disability Tax Credit, and age credit: Common-law partners can transfer unused tax credits, such as post-secondary education credits, the Disability Tax Credit, and the age credit for those 65 and older, to reduce their household tax rate.
It's important to note that while there are benefits to filing taxes as a common-law couple, there may also be disadvantages. For example, your combined family income may disqualify you from certain benefits programs, such as the GST/HST credit, that you would have been eligible for as a single person. Additionally, common-law partners may no longer be eligible for certain tax credits, such as the Canada Child Benefit and the Guaranteed Income Supplement.
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Tax filing process
In Canada, common-law relationships are legally recognised as equivalent to marriage for tax purposes. This means that common-law couples must file their taxes differently from single people, and there are potential tax benefits and drawbacks to this.
Firstly, it is important to understand what constitutes a common-law relationship in Ontario. According to the Canada Revenue Agency (CRA), a couple is considered to be in a common-law relationship if they have lived together in a conjugal relationship for at least 12 months. Alternatively, if a couple has a child together, they are considered common-law as soon as they begin living together.
Now, here is a step-by-step guide to the tax filing process for common-law couples in Ontario:
Step 1: Disclose Your Relationship Status
When filing your individual tax return, you must indicate your relationship status and provide information about your partner. This includes their name, Social Insurance Number (SIN), net income, and employment status. Failing to disclose your common-law status is considered tax fraud and can result in reassessments, penalties, and denial of certain benefits.
Step 2: Prepare Your Returns
You have the option to prepare your tax returns separately or together. Preparing your returns together, also known as a "coupled return", can help maximise tax savings and minimise the amount of tax owed. This can be done using tax preparation software or with the help of a tax advisor.
Step 3: Combine Credits and Deductions
One of the main advantages of filing as a common-law couple is the ability to combine or transfer credits and deductions. This includes combining medical expenses, charitable donations, and certain tax credits, such as the spousal amount, post-secondary education credits, and the Disability Tax Credit. By combining these, you may be able to increase your tax savings.
Step 4: Consider Family Income
As a common-law couple, the CRA will consider your combined family income when determining eligibility for certain benefits and credits. This includes benefits such as the GST/HST credit, Canada Child Benefit (CCB), and the Guaranteed Income Supplement. Combining incomes may result in losing eligibility for certain benefits that are income-dependent.
Step 5: Account for Separation
If your common-law relationship breaks down, you must still account for this in your tax filings. The CRA considers a couple officially separated if they have lived apart for at least 90 days due to a breakdown in the relationship. When filing your tax return for the year of separation, you will need to include your ex-partner's income up to the date of separation.
In conclusion, the tax filing process for common-law couples in Ontario involves disclosing your relationship status, preparing your returns together, combining credits and deductions, considering the impact of combined family income, and accounting for any periods of separation. By following these steps and understanding the definition of a common-law relationship, you can ensure accurate and beneficial tax filings.
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Financial planning
For financial planning purposes, it is important to understand how your relationship status in Ontario affects your taxes. In Canada, if you meet the definition of common law, you must disclose that on your tax return. You are considered married for tax purposes, so file accordingly.
To be considered common-law partners in Canada, you must have lived together in a conjugal relationship for the last 12 months. Alternatively, if you live with someone who is the parent of your child by birth or adoption, you are automatically considered to be in a common-law partnership with them. If you have lived together for less than 12 months, the CRA considers you common-law partners if you share a child by birth or adoption or if one of you supports the other one's child.
When filing your tax return, you will need to provide information about your common-law partner, including their net income, for certain credits to calculate properly. If you or your partner's net income is less than a certain amount, the other person will get a tax credit called the spouse or common-law partner amount. You can also split or share certain credits. For example, if you both have medical expenses, one of you can claim them all to increase your refund. Common-law partners may also transfer unused tax credits to their partner to reduce their household tax rate. These include post-secondary education credits, the Disability Tax Credit, the age credit, and pension income amounts.
There are also disadvantages to filing as common-law. The CRA combines your family income to determine eligibility for benefits such as the GST/HST credit, the Canada Child Benefit, and the eligible dependant credit. You may no longer be eligible for certain tax credits, including the GST/HST credit, Canada Child Benefit, Guaranteed Income Supplement, and Working Income Tax Benefit. You will only be able to claim one exemption from capital gains on your primary residence.
It is important to note that if you are in a common-law relationship and do not indicate this on your tax return, you may be found guilty of tax fraud, with possible consequences including being reassessed for unpaid taxes (including interest and penalties) or being denied CPP benefits or other pension or survivor benefits in the future.
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Frequently asked questions
Common-law partners are considered married for tax purposes. Common-law couples in Canada are not allowed to file joint returns. Instead, they file single returns and mark that they're in a partnership. To be considered a common-law partnership, couples must have lived together in a conjugal relationship for 12 continuous months or immediately if they have a child together.
It is against the law to lie on your income tax return, including about your relationship status. You run the risk of being reassessed and paying interest and penalties on unpaid taxes. You also risk being denied CPP and other pension survivor benefits.
Common-law partners may transfer unused tax credits to their partner to reduce their household tax rate. These include post-secondary education credits, the Disability Tax Credit, the age credit, and pension income amounts. A con of filing as common-law is that CRA combines your family income to determine eligibility for benefits such as the GST/HST credit, the Canada Child Benefit, and the eligible dependant credit.
You will need to provide information about your common-law partner, including their name, social insurance number (SIN), net income, and employment status. You will file individual tax returns but indicate your marital status and who you are living with on the return.







































