Updated Checked by the Tax-Services.ca editorial team How we check
CRA Sudbury means the Sudbury Tax Centre, and on the CRA’s own address page it’s a mailing destination: 1050 Notre Dame Avenue, Sudbury ON P3A 5C2 for income tax and benefit returns. If you live in the Sudbury area and were hoping for a counter to walk up to, read the next section before you drive anywhere.
Can you visit the CRA in Sudbury in person?
We couldn’t confirm that. The CRA’s page lists Sudbury as a tax centre with two mailing addresses. It says nothing about walk-in service, opening hours or appointments, and it points people to submitting documents online instead. So we won’t tell you there’s a public counter, or that there isn’t one.
If you need a person, the safest route is to start from the CRA’s contact pages on Canada.ca or your CRA account, not from a listing on a directory site. Many questions, like checking a balance or a missing slip, can be answered without anyone ever seeing your face.
Where do you mail a tax return to the Sudbury Tax Centre?
There are two addresses, and the postal codes differ by one character. That’s the kind of detail that gets a letter delayed.
| What you’re sending | Address |
|---|---|
| Income tax and benefit returns | Sudbury Tax Centre, 1050 Notre Dame Avenue, Sudbury ON P3A 5C2 |
| Other documents or correspondence | Sudbury Tax Centre, Post Office Box 20000, Station A, Sudbury ON P3A 5C1 |
The same page lists tax centres in Winnipeg, Prince Edward Island and Jonquière as well. It tells you to mail a paper return to the appropriate tax centre, and it has a selector for that. We haven’t confirmed which one covers your postal code, so use the selector on the CRA page instead of guessing from a neighbour’s advice.
Do you need to mail anything at all?
Probably not. The CRA’s NETFILE and ReFILE services are open for transmission from Monday, February 23, 2026, until Friday, January 29, 2027. You can file returns for the 2018 to 2025 tax years through them, using certified software.
If you do mail something, use a method with a tracking number and keep a copy.
The CRA hasn’t posted the dates for the 2026 tax year as far as we’ve seen, but the usual ones would be April 30, 2027 for most people and June 15, 2027 for the self-employed. For the 2025 return, the filing and payment deadline for most people was April 30, 2026. Self-employed people had until June 15 to file, but any tax owing was still due April 30.
What can you do online instead of calling or visiting?
Quite a bit. A CRA account lets you see your notice of assessment, your balance and your slips without waiting on hold. If a letter arrives asking for a document, check whether the letter itself offers an upload option, since the CRA points people to submitting documents online. It saves a trip to the post office and gives you a record that it went through.
A quick example: Marc in Sudbury gets a letter asking for proof of a $1,200 childcare claim. Instead of buying an envelope and a tracking number, he looks for the online submission route first. Only if the letter says otherwise does he mail the copies to the address printed on it.
What can you estimate before you contact the CRA?
Much of what people phone about is a number they could have checked first. Wondering whether a refund looks right? Take a Sudbury employee earning $75,000 with $14,000 of tax withheld. The tax refund calculator gives income tax of $12,704.65 for the year (using Ontario rates) and a refund of $1,295.35. With only $10,000 withheld, the same person owes $2,704.65.
That’s a useful check against your notice of assessment. If your figure is far off the estimate, look for a missing slip or credit before you call. The income tax calculator shows the total tax and what’s left after CPP and EI, and the tax installments calculator is for people who pay tax in instalments during the year.
These are estimates. They leave out benefits, refundable credits and many claims. Only the CRA can give you your actual balance.
What should you gather before you contact the CRA?
A short preparation saves time whether you write, upload or call. Have your social insurance number, the tax year in question, and the letter or notice reference in front of you. Pull your notice of assessment and the slips you received for that year. If the letter asks for proof of a claim, collect the receipts or statements that match the amount and put them in the same order the letter lists them.
Write down in two sentences what you think the problem is and what outcome you expect. When you have that, it is much easier to tell whether you need to send a document, correct a return or simply read a balance. Keep the date you acted and any confirmation number you are given.
How do you keep a record of what you sent?
Whatever route you use, keep proof. For mail, that means a copy of every page and the tracking receipt from the post office. Mark on your copy which of the two Sudbury addresses you used and why, since the postal codes differ by one character. For an online upload, save the confirmation screen or number.
Put everything for that tax year into one folder, paper or digital, and add a note with the dates. If the CRA later says it never received something, you can show what you sent and when. Marc, from the example above, would keep the letter, the $1,200 childcare proof he submitted and the confirmation together. Check the CRA page for your situation if the letter names a specific method.
What mistakes cause delays?
Sending to the wrong address is the common one, particularly mixing up the two postal codes above. Another is mailing a return when the online route would have taken minutes.
Don’t rely on a page that offers “tax help in Sudbury” and asks for your details either. We don’t know of any private service linked to the CRA, and we make no claim of any link ourselves. If a firm says it can speak for you, ask to see the authorization form you’d sign.
Official page on this topic: Canada Revenue Agency: Contact the CRA.
Where we got these figures
The addresses come from the Canada Revenue Agency‘s page on tax centres and offices, and the NETFILE dates from its NETFILE overview, both read in 2026. The 2025 return deadlines come from its filing dates page for that tax year. Income examples come from this site’s calculators, which use Ontario and federal rates for 2026.
Frequently asked questions
What is the CRA's address in Sudbury?
Sudbury Tax Centre, 1050 Notre Dame Avenue, Sudbury ON P3A 5C2 for income tax and benefit returns. Other correspondence goes to Post Office Box 20000, Station A, Sudbury ON P3A 5C1.
Can I walk in to the CRA in Sudbury?
We couldn't confirm it. The CRA's address page gives mailing addresses only and says nothing about counter service.
Do I have to mail my return?
No. NETFILE is open from February 23, 2026 to January 29, 2027 for the 2018 to 2025 tax years, using certified software.
What are the 2026 tax year dates?
We haven't seen them published yet. Check the CRA's dates page before you rely on any date.
- Dealing with the CRA: letters, audits and payments
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