
In Canada, common-law relationships are on the rise, and it is important to understand how they affect income tax and child tax benefits. Under the federal Income Tax Act, common-law couples are treated the same as married couples, and must file their tax returns as such. This can have implications for tax credits and benefits, such as the Canada Child Benefit (CCB). The CCB is a non-taxable amount paid monthly to eligible families with children under 18 and is based on household income. When filing taxes as common-law, family incomes are combined, which can impact eligibility for benefits and result in either increased or decreased benefits.
| Characteristics | Values |
|---|---|
| Common-law partners definition | A couple living in a conjugal relationship for at least 12 continuous months, or immediately if they have a child together |
| Common-law partners' tax filing requirements | Each partner must file their own tax return, including their partner's name, social insurance number, and net income |
| Common-law partners' tax benefits | Ability to maximize certain tax credits and deductions, such as combining receipts for medical expenses and charitable donations, claiming the Family Tax Cut, and transferring unused tax credits to their partner |
| Common-law partners' impact on child tax benefit | The child tax benefit is calculated based on household income, so filing as common law may decrease the benefit as household income increases |
| Common-law partners' separation impact | To be considered officially separated, the couple must be apart for at least 90 days, and their claim for the common-law partner amount is calculated using their partner's net income before the date of separation |
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What You'll Learn
- Common-law partners must file individual tax returns and include their partner's details
- Common-law couples are treated the same as married couples for tax purposes
- Common-law partners can transfer unused tax credits to their partner
- Common-law partners can combine receipts to maximise tax credits
- Common-law partners must disclose their relationship status on their tax return

Common-law partners must file individual tax returns and include their partner's details
In Canada, common-law partners must file individual tax returns and include their partners' details. The Canada Revenue Agency (CRA) defines common-law marriage as living in a conjugal relationship with a person who is not your married spouse, with at least one of the following conditions being met:
- The person has lived with you in a conjugal relationship for at least 12 continuous months, including any period where you were separated for less than 90 days due to a relationship breakdown.
- The person is the parent of your child by birth or adoption.
- The person has custody and control of your child (or had custody immediately before the child turned 19) and the child is wholly dependent on them for support.
If you meet the CRA's definition of a common-law partnership, you must disclose your relationship status and your partner's details on your tax return. This includes your partner's name, social insurance number, and net income. By filing as common-law partners, couples can benefit from income splitting, combined deductions and credits, and increased benefits such as the Canada Child Benefit (CCB) and the GST/HST credit. However, it is important to note that there can also be disadvantages to filing as common-law versus filing as a single person.
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Common-law couples are treated the same as married couples for tax purposes
In Canada, common-law couples are treated the same as married couples for tax purposes. This means that common-law partners must file their taxes as a couple and include their partner's information on their tax return, including their name, social insurance number, and net income.
The definition of a common-law partner in Canada is someone with whom you live in a conjugal relationship, and at least one of the following conditions must be met: the person has lived with you for at least 12 continuous months (including any period where you were separated for less than 90 days due to a relationship breakdown); they are the parent of your child by birth or adoption; or they have custody and control of your child (or had custody immediately before the child turned 19) and the child is wholly dependent on them.
When it comes to child tax benefits, such as the Canada Child Benefit (CCB), common-law couples are treated the same as married couples. The CCB is a non-taxable benefit paid monthly to eligible families with children under 18, and the amount is based on the age of the children and the household income. Both individuals in a shared custody arrangement should apply for the CCB, and the parent with whom the child resides the majority of the time is usually considered to be primarily responsible for the child and should apply for the benefit.
There are advantages and disadvantages to filing taxes as a common-law couple. One advantage is the ability to combine deductions and credits, such as medical expenses and charitable donations, to maximize tax savings. Common-law partners can also transfer unused tax credits to their partner to reduce the household tax rate. Additionally, couples can reduce their overall tax burden by splitting income between spouses and leveraging lower tax brackets. However, there may be instances where filing as a single person may result in lower taxes and increased benefits.
It is important to note that failing to disclose your correct marital status, including a common-law partnership, on your tax return is considered tax fraud and can result in penalties and interest on unpaid taxes.
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Common-law partners can transfer unused tax credits to their partner
In Canada, common-law partners are required to disclose their relationship status and their partner's information on their tax returns. The CRA combines the family income of common-law partners to determine eligibility for benefits such as the GST/HST credit, the Canada Child Benefit, and the eligible dependent credit.
To be considered a common-law partnership in Canada, at least one of the following conditions must be met:
- The couple has been living together in a conjugal relationship for at least 12 continuous months.
- The couple has a child together by birth or adoption.
- One partner has custody and control of the other partner's child/ren, and the child/ren is/are wholly dependent on that person for support.
It is important to note that if common-law partners separate due to a breakdown in the relationship for 90 days or more, they cannot transfer any unused amounts to each other.
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Common-law partners can combine receipts to maximise tax credits
In Canada, common-law couples are treated the same as married couples under the federal Income Tax Act. Each partner must file their own tax return, but they are considered a couple for tax purposes, and their combined household income is used to determine eligibility for government benefits and tax credits.
Common-law partners can combine their receipts for medical and charitable donations to maximise deductions claimed on their individual returns. This can help them to pay less tax.
There are other advantages to filing as a common-law partner, such as the ability to 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 (for those 65 and over), and pension income amounts.
However, there are also disadvantages to filing as a common-law partner. One partner may lose some tax credits they were entitled to when filing as a single person because their combined income makes them ineligible.
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Common-law partners must disclose their relationship status on their tax return
In Canada, common-law partners are treated the same as married couples for tax purposes. Common-law partners must disclose their relationship status on their tax return. This is because the Canada Revenue Agency (CRA) calculates government benefits based on household income.
A common-law partnership is defined as when two people live together in a conjugal relationship for 12 months, or immediately if they have a child together. If you meet this definition, you must file as common law. Common-law partners must each file their own tax return with the CRA, and include their partner's name, social insurance number, and net income (even if it is zero).
There are advantages to filing as a common-law couple, including the ability to combine receipts for medical expenses and charitable donations to maximise credits and pay less tax. You may also be able to claim the Family Tax Cut, transfer credits to your partner, and increase your Canada Child Benefit (CCB) based on combined income.
However, there are also disadvantages to filing as common-law. CRA combines family income to determine eligibility for benefits such as the GST/HST credit, the CCB, and the eligible dependant credit. Failing to indicate the correct marital status is considered tax fraud, and you may be asked to repay any benefits received with penalties and interest.
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Frequently asked questions
A common-law partnership is defined as when two people live together in a conjugal relationship for 12 months, or immediately if they have a child together.
Common-law partners must file their tax returns separately, but family incomes are combined to calculate income-tested benefits, such as the GST/HST credit or the CCB. Couples can also combine charitable donations and medical expenses, which can increase potential payments. However, CCB payments decrease as household income increases, and there are tiers to these payments.
It is illegal to lie on your income tax return, including about your relationship status. If you receive benefits you are not entitled to because of an incorrect marital status, you will be asked to repay them with penalties and interest due.





























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