
In Canada, a common-law partnership is legally recognized as a relationship in which two individuals have lived together in a conjugal relationship for a continuous period of at least 12 months. If you were in a common-law relationship in the tax year for which you are filing, you must note your status and include your partner's income and social insurance number. While joint filing can offer income splitting and other benefits, it is important to understand the potential impact on individual credits and liabilities. Incorrect filing can lead to hefty penalties and even legal consequences.
| Characteristics | Values |
|---|---|
| Definition of common-law partnership | Two individuals have been living together in a conjugal relationship for a continuous period of at least 12 months |
| Common-law status | If you were married or in a common-law relationship in the tax year for which you are filing, you must note your status in the "information about you" section of your tax return |
| Common-law tax return | Common-law partners file their taxes individually but must indicate that they are in a common-law relationship |
| Common-law tax credits | 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 |
| Common-law tax deductions | Common-law spouses can combine medical expenses and donations and may receive larger combined tax savings than when filing as single individuals |
| Common-law tax benefits | Common-law partners can benefit by paying less tax overall by splitting their eligible pension income |
| Common-law tax disadvantages | Filing as common-law versus as a single person can lead to the loss of certain credits, such as the GST/HST credit, Canada Child Benefit, and Guaranteed Income Supplement |
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What You'll Learn

Common-law partners must file taxes individually
In Canada, common-law partners are not allowed to file joint income tax returns. Each Canadian files their own tax return, regardless of their marital status. Common-law partners must file taxes individually, but they must indicate their marital status and include their partner's name, income, and social insurance number (SIN) on their return.
The CRA defines a common-law partnership as a relationship in which two individuals have lived together in a conjugal relationship for a continuous period of at least 12 months. If the couple has a child together, the 12-month requirement does not apply. Additionally, the couple must not have lived apart for more than 90 days.
There are advantages and disadvantages to filing taxes as a common-law couple. One advantage is that common-law partners can combine medical expenses and donations, which may result in larger tax savings than when filing as single individuals. They can 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.
However, there are also disadvantages to filing as a common-law couple. One disadvantage is the loss of certain credits and deductions that are only available to single individuals. For example, single individuals may qualify for credits such as the GST/HST credit and the Canada Child Benefit, which may not be available to those in a common-law relationship. Additionally, if one partner has a complex financial situation, such as a business with various deductions, it could complicate the tax filing process when combining finances.
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Common-law couples can combine medical expenses and donations
In Canada, common-law couples are treated the same as married couples under the federal Income Tax Act. Common-law couples must file their taxes separately, but they can combine medical expenses and donations to maximize their tax savings.
To be considered a common-law couple, you must have lived together in a conjugal relationship for at least 12 continuous months, including any period you were separated for less than 90 days due to a relationship breakdown. Alternatively, if you have a child together or one partner has custody and control of the other's child, you are immediately considered common-law.
When filing taxes, common-law couples must indicate their status and include their partner's name, social insurance number, and net income. By combining medical expenses, couples can apply the deduction to the tax return of the partner with the lower income, resulting in a larger tax credit. Similarly, charitable donations can be combined to maximize tax credits, as higher donation amounts qualify for larger credits.
Additionally, common-law couples can transfer credits, such as the Disability Tax Credit, pension income, and age amount, to optimize their tax savings. They can also take advantage of income splitting, where income is split between spouses to leverage lower tax brackets and maximize deductions.
It's important to note that while common-law couples may gain tax advantages, they may also lose certain tax credits they were entitled to when filing as single individuals due to changes in eligibility or increased combined income.
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Common-law partners can transfer unused tax credits to each other
In Canada, common-law partners are required to disclose their relationship status and information about their partner when filing their tax returns. This includes noting their status in the "information about you" section of the tax return and providing information about their spouse, such as their name, social insurance number (SIN), net income, and employment status.
- Tuition, education, and textbook amounts: The maximum amount that can be transferred is $5,000 minus any amounts used by the transferring spouse in the current year.
- Age amount: If the spouse or common-law partner is 65 years of age or older, their age amount can be transferred.
- Disability Tax Credit: This can be transferred to a supporting family member, including a spouse or common-law partner.
- Pension income amount: Eligible pension income can be split with a spouse or common-law partner.
- Canada Caregiver Amount: This can be claimed for infirm children under 18 years of age.
It is important to note that the transfer of these credits is subject to certain conditions and limitations, such as the requirement to complete specific forms and schedules for each credit type. Additionally, if common-law partners separate due to a breakdown in the relationship for a period of 90 days or more, they cannot transfer any unused amounts to each other.
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Common-law couples lose certain credits
In Canada, common-law couples are treated the same as married couples under the federal Income Tax Act. While being in a common-law relationship does not change the tax rates, it does offer some benefits for tax purposes. Common-law couples can combine medical expenses and donations and may receive larger combined tax savings than when filing as single individuals.
However, there are certain disadvantages to filing taxes as a common-law couple. One of the main disadvantages is that common-law couples may no longer be eligible for certain tax credits that they would have been entitled to when filing as single individuals. This includes the GST/HST credit, Canada Child Benefit, Guaranteed Income Supplement, and Working Income Tax Benefit.
For example, a single man who previously claimed a $15,000 eligible dependent credit for his child lost the credit after moving in with his girlfriend. The credit was dependent on him being single. Additionally, common-law couples can only claim one exemption from capital gains on their primary residence, whereas single individuals can claim an exemption for each of their residences.
Furthermore, common-law couples may experience a reduction in the GST/HST credit if their combined income exceeds a certain threshold. The GST/HST credit is calculated based on adjusted family net income, and a couple with a higher combined income may no longer be eligible for this benefit.
It is important to note that the impact of being in a common-law relationship on tax credits and benefits can vary depending on individual circumstances, such as income levels and the number of dependents.
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Common-law partners must indicate their relationship status on their tax return
In Canada, common-law partners are required to indicate their relationship status on their tax returns. The Canada Revenue Agency (CRA) defines a common-law partnership as when two individuals have lived together in a conjugal relationship for at least 12 continuous months. Alternatively, if the couple has a child together, they are also considered common-law partners.
When filing taxes, common-law partners must disclose their relationship status and include their partner's income and social insurance number (SIN). While common-law partners file taxes individually, their relationship status impacts their tax returns. By indicating their status, common-law partners can combine medical expenses and donations, potentially resulting in larger tax savings than when filing as single individuals. Additionally, if one spouse is not working, the other spouse can claim them as a dependent and gain tax credits. Common-law partners can also transfer unused tax credits, such as post-secondary education credits and the Disability Tax Credit, to their partner to reduce their household tax rate.
However, there are disadvantages to filing as a common-law partner. The CRA combines the household income of common-law partners to determine eligibility for certain benefits, such as the GST/HST credit and the Canada Child Benefit. As a result, some individuals may no longer qualify for certain tax credits or benefits that they were eligible for when filing as single. Therefore, it is essential for common-law partners to carefully consider the advantages and disadvantages of filing taxes jointly or individually and seek advice from tax professionals to ensure accurate and compliant tax filings.
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Frequently asked questions
Common-law partners can combine medical expenses and donations and may receive larger combined tax savings than when filing as single individuals. They can also transfer unused tax credits to their partner to reduce their household tax rate.
While some tax credits and deductions increase when filing jointly, others may decrease or become unavailable. For instance, single individuals may qualify for certain credits that are not applicable to individuals in a relationship.
The Government of Canada defines common-law marriage as living in a conjugal relationship with a person who is not your married spouse. To be considered common-law partners, couples must have lived together for at least 12 continuous months, or have a child together.







































