
In Canada, common-law relationships are on the rise, with more than one in five Canadian couples living together in an official, legal union without being legally married. For tax purposes, common-law couples are treated the same as married couples, and must file their individual taxes as such. This means that common-law couples combine to become one household, and any benefits based on household income may be affected. There are both advantages and disadvantages to filing as a common-law couple, including the ability to transfer unused tax credits to a partner to reduce the household tax rate, and the potential for a bigger tax refund. However, a higher combined income may reduce eligibility for certain benefits.
Characteristics and Values of Common Law in Canada for Taxes
| Characteristics | Values |
|---|---|
| Definition of common-law marriage | Living in a conjugal relationship with a person who is not your married spouse |
| Conditions | At least one of the following: the person has lived with you for at least 12 continuous months; the person is the parent of your child by birth or adoption; the person has custody and control of your child (or had it immediately before the child turned 19) and the child is wholly dependent on them for support |
| Involuntary separation | When one spouse lives away for work, school, health reasons, or is incarcerated |
| Tax filing | Common-law partners must file individual tax returns, indicating their marital status as common-law. They must include their partner's name, social insurance number, and net income. |
| Tax credits | Common-law status may unlock eligibility for certain tax credits and benefits not available to single filers, such as the GST/HST credit, the Canada Child Benefit, and the spousal amount tax credit. |
| Income splitting | Common-law couples can split certain types of income, such as pension income, to reduce their overall tax liability. |
| Tax deductions | Common-law partners can combine medical expenses to surpass the minimum threshold required for claiming these expenses on their tax returns. |
| Tax fraud | Failing to disclose common-law status on tax returns may be considered tax fraud, and there may be penalties related to benefits received. |
| Tax planning | Understanding the tax implications of common-law status is crucial for financial planning, and a chartered professional accountant can help navigate the complexities. |
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What You'll Learn

Common-law marriage definition
In Canada, common-law marriage is defined as living in a conjugal relationship with a person who is not your married spouse. To be considered a common-law couple, at least one of the following conditions must be met:
- The couple has lived together in a conjugal relationship for at least 12 continuous months, including any period of separation of less than 90 days due to a breakdown in the relationship.
- One partner is the parent of the other's child by birth or adoption.
- One partner has custody and control of the other's child (or had custody and control before the child turned 19) and the child is wholly dependent on that person for support.
It is important to note that the definition of a common-law relationship may vary across different provinces in Canada. For tax purposes, common-law couples are treated the same as married couples and must file their taxes accordingly. They must each file individual tax returns and indicate their common-law status, combining their family income to determine eligibility for certain credits and benefits.
Being in a common-law relationship can offer some tax benefits, such as the ability to transfer certain tax credits and deductions between partners and combine medical expenses to maximize credits. However, there may also be disadvantages, as a higher combined income may reduce eligibility for certain income-tested benefits. Therefore, it is essential for common-law couples to understand the tax implications of their relationship status and seek professional advice if needed.
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Common-law tax filing
In Canada, common-law couples are treated the same as married couples for tax purposes. This means that common-law partners must file individual tax returns, indicating their marital status as common-law and providing their partner's name, social insurance number, and net income.
To be considered a common-law couple in Canada, a couple must live together in a conjugal relationship for at least 12 continuous months, including any period of separation of less than 90 days due to a relationship breakdown. Alternatively, if a couple lives together and has a child together by birth or adoption, they are automatically considered common-law partners.
There are both advantages and disadvantages to filing taxes as a common-law couple. One advantage is the ability to transfer unused tax credits to the partner with the lower tax rate to reduce the household tax rate. Examples of these credits include post-secondary education credits, the Disability Tax Credit, and the age credit for those 65 and older. Common-law partners can also combine their medical expenses to surpass the minimum threshold required for claiming these expenses on their tax returns. Additionally, certain pension income-splitting options are available to common-law couples, potentially lowering the overall tax burden by allocating income to the partner in a lower tax bracket.
On the other hand, a disadvantage of filing as a common-law couple is that the CRA combines the couple's family income to determine eligibility for certain benefits and credits. This higher combined income may reduce eligibility for income-tested benefits and credits, such as the Guaranteed Income Supplement.
It is important to note that if an individual is living in a common-law relationship but does not disclose this on their tax return, they may be guilty of filing a fraudulent tax return.
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Common-law tax credits
In Canada, common-law relationships are on the rise. According to the federal Income Tax Act, common-law couples are treated the same as married couples for tax purposes. This means that common-law partners must file individual tax returns and indicate their common-law status. While marital status doesn't affect tax rates, it does offer potential benefits for tax credits and deductions.
To be considered common-law under the Income Tax Act, a couple must meet at least one of the following conditions:
- They have been living together in a conjugal relationship for at least 12 continuous months (including any period of separation of less than 90 days due to a breakdown in the relationship).
- They are the parents of a child by birth or adoption.
- One partner has custody and control of the other partner's child (or had custody before the child turned 19) and the child is wholly dependent on them for support.
Common-law partners can take advantage of various tax credits and deductions, such as:
- Combining receipts for medical expenses and charitable donations to maximize credits.
- Claiming the Family Tax Cut if they have a child under 18.
- Claiming the federal and provincial spousal amount tax credit if they financially supported their partner and their income was below a certain threshold.
- Claiming the $5,000 Home Buyers tax credit if they are new homeowners.
- Transferring unused tax credits to their partner, such as post-secondary education credits, the Disability Tax Credit, and the age credit.
It is important to note that common-law partners must each file their own tax returns and include their partner's name, social insurance number, and net income (even if it is zero). Failure to disclose a common-law relationship on a tax return may result in penalties and be considered tax fraud.
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Common-law tax benefits
In Canada, common-law couples are treated the same as married couples for tax purposes. To be considered a common-law couple, a pair must live in a conjugal relationship for at least 12 continuous months, or one person must be the parent of the other's child by birth or adoption, or one person must have custody and control of the other's child and the child must be wholly dependent on them for support.
If you meet the definition of a common-law couple, you must indicate this on your tax return. Both partners must file their own tax returns, declaring their partner's name, social insurance number, and net income. The Canada Revenue Agency (CRA) will then calculate government benefits based on the household income.
There are advantages and disadvantages to filing as a common-law couple. One advantage is that you may be able to maximise certain tax credits and deductions. For example, you may be able to combine receipts for medical expenses and charitable donations to increase your credits and reduce your tax. You may also be able to claim the Family Tax Cut, the federal and provincial spouse or common-law partner amount tax credit, and the $5,000 Home Buyers tax credit. Additionally, common-law partners can 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.
However, there are also some disadvantages to filing as a common-law couple. The CRA combines the family income to determine eligibility for benefits such as the GST/HST credit, the Canada Child Benefit, the eligible dependant credit, and the Guaranteed Income Supplement and Allowance.
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Common-law tax penalties
In Canada, common-law couples are treated the same as married couples for tax purposes. However, common-law partners cannot file joint returns; instead, they each file single returns and indicate that they are in a partnership. This involves disclosing their partner's name, social insurance number, and net income on their return.
There are several penalties that may be incurred by common-law partners who do not adhere to tax regulations. Firstly, it is considered tax fraud to file as single without claiming your accurate common-law status. This may result in penalties relating to benefits received that would not have been qualified for if the common-law partnership had been listed.
Secondly, common-law partners must accurately report their marital status when filing their tax returns. Failure to do so may result in reassessment, leading to the payment of interest and penalties on unpaid taxes, as well as the risk of being denied CPP and other pension survivor benefits.
Thirdly, common-law partners who separate must update their marital status to "separated" after 90 days of living apart due to a breakdown in the relationship. While there are no specific penalties for filing as separated, certain benefits such as the ability to share non-refundable tax credits may be lost.
In addition, common-law partners may face the same penalties as other taxpayers for failing to file returns on time or neglecting to report all sources of income, which can result in hefty fines and a larger tax bill.
Overall, it is important for common-law partners in Canada to understand their tax obligations and accurately report their marital status and income to avoid incurring penalties and ensure they receive the correct benefits.
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Frequently asked questions
Common-law in Canada refers to a couple that is not married but has lived together in a conjugal relationship for at least 12 continuous months. Alternatively, if a couple lives together and has a child together, they are automatically considered common-law.
Common-law couples must file their individual taxes as common-law and indicate their marital status on their tax return. They are considered married for tax purposes and must file accordingly. Both partners must file their own tax returns and include their partner's name, social insurance number, and net income.
Common-law status may unlock eligibility for certain tax credits and benefits not available to single filers, such as the Goods and Services Tax (GST)/Harmonized Sales Tax (HST) credit, the Canada Child Benefit, and the spousal amount tax credit. There are also opportunities for income splitting, such as with certain pension incomes, and combining expenses like medical expenses. However, a higher combined income may reduce eligibility for certain income-tested benefits and credits.





































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