Filing as Common-Law in Canada: What It Does to Your Credits and Benefits

You moved in together, nothing was signed, and nobody proposed. As far as the Canada Revenue Agency is concerned, on the first anniversary of that move you became a couple, and the tax return you file next spring is not the one you filed last year.

This catches people out in both directions. Some report late and get a bill for benefits they were not entitled to. Others report on time and never claim the transfers that only couples can use. Both are avoidable once you know which levers the status actually moves.

What makes you common-law to the CRA

The CRA does not ask whether you feel committed. It applies a test, and you meet it if any one of these is true.

• You have lived together in a conjugal relationship for 12 continuous months. Short breakups under 90 days do not restart the clock.
• You have a child together, by birth or adoption.
• One of you has custody and control of the other's child, and that child is wholly dependent on you for support.

Provincial family law uses its own definitions for property and support, and they do not match. A province may treat you as common-law after two or three years while the CRA already did at twelve months. For tax and benefits, the CRA definition is the one that applies.

What you lose: income-tested benefits move to household income

Every income-tested federal and provincial benefit switches from your income to your combined family net income the moment you are a couple. Nothing about your earnings changed. The test did.

Only one of you can claim the GST/HST credit and the Canada Child Benefit for the household. The CRA decides who receives it rather than splitting it, and for the child benefit it presumes the parent primarily responsible for the child's care.

The number that matters here is line 23600 net income for both of you, added together. Run both returns before you assume the direction of the change, because a partner in school, on parental leave, or between jobs can leave family income lower than you expect. The take-home pay calculator gives you a realistic net figure to work from.

What you gain: transfers, pooling and splitting

The other side of the ledger is real, and it is the part people leave on the table. None of these are available to two people filing as single.

Unused credits transfer to the higher-income partner

If your partner cannot use their full age amount, pension income amount, disability amount, or tuition amount because their income is too low, the unused portion can transfer to you. Tuition transfers are capped and only the current year's amount transfers, so carry-forward stays with the student.

The spouse or common-law partner amount

When one partner's net income is low, the other can claim a non-refundable credit for supporting them. This is often the single largest line that appears on a first return filed as a couple.

Medical expenses and donations pool

Medical expenses are reduced by a percentage of net income before they count, so pooling the household's receipts on the lower-income partner's return usually produces a bigger claim. Charitable donations work the other way: combine them on one return to clear the first-tier threshold and get the higher rate on the excess.

Pension income splitting and spousal RRSPs

Retirees can allocate up to half of eligible pension income to the lower-income partner, which can pull a household out of an Old Age Security clawback. Before retirement, a spousal RRSP does the same job in advance: the higher earner takes the deduction, and the lower earner eventually withdraws at their own rate. If you are weighing that against a matched workplace plan, read whether to take employer RRSP matching.

The first-time home buyer trap

First-time buyer status is not personal once you are a couple. For the FHSA and the Home Buyers' Plan, you are generally disqualified if you lived in a home that your spouse or common-law partner owned during the current year or the four preceding calendar years. Someone who has never owned anything can lose the status by moving in with a partner who owns their condo.

The timing is worth planning around rather than discovering. The step-by-step FHSA guide sets out the qualifying rules and the withdrawal sequence in full.

What to do in the next hour

1. Work out the date you met the CRA test, which for most couples is twelve months after you started living together.
2. Update your status in CRA My Account, or file Form RC65 if you prefer paper. Both partners should confirm it shows correctly.
3. Run both returns as a couple and as singles in the same software to see the true net effect before you file.
4. Move medical receipts to the lower-income return and donations to one return.
5. Check whether either of you is relying on first-time buyer status, and confirm it survives the relationship.

If you have been late reporting, the CRA's Voluntary Disclosures Program exists for exactly this, and coming forward before you are contacted is materially better than the alternative.

Frequently asked questions

Do we have to file a joint tax return in Canada?

No. Canada has no joint return. You each file your own, but each return reports the other's name, social insurance number and net income, and the CRA uses the combined figure for income-tested benefits.

What happens if I do not report that I am common-law?

The CRA can reassess, recover benefits you were not entitled to, and charge interest. Reporting late is treated more gently than being caught, and the Voluntary Disclosures Program is designed for people correcting it themselves.

Will my GST/HST credit stop?

It may. The credit is tested on family net income, so two incomes that were each below the threshold can combine to sit above it. Only one partner receives the household payment.

We separated. When do I tell the CRA?

After 90 consecutive days of living separate and apart, and the change is then effective from the original separation date. Reporting early and reconciling inside the 90 days creates its own correction.

Does living together affect my first-time home buyer status?

Yes. A home your partner owned and you lived in during the current year or the previous four calendar years can end your status for the FHSA and the Home Buyers' Plan.

Sources

• CRA: Marital status
• CRA: GST/HST credit
• CRA: Canada Child Benefit
• CRA: Amounts transferred from your spouse or common-law partner
• CRA: Pension income splitting