Canadian tax returns are not perfect, and errors do occur. Whether due to incomplete data, incorrect figures, or missed credits, the Canada Revenue Agency (CRA) permits taxpayers to make errors using a t1 adjustment request. If you have ever questioned how to correct errors in your return or what happens, this guide has all you need to know about how to file a t1 adjustment request in Canada.
What is a T1 Adjustment Request?
A t1 adjustment request is a request to correct a tax return already filed in Canada. If you notice mistakes after you’ve filed your taxes, you don’t need to panic, this request allows you to make corrections. Some of the reasons you can file a t1 adjustment request form include correcting income data, claiming missed deductions, or correcting personal data mistakes.
So, what is a t1 adjustment request, anyway? Basically, it’s a request to the CRA to fix your T1 General tax return. As opposed to filing a brand new return, it’s only adjustments, and this makes it faster and easier. The CRA does have some avenues for filing it so that your adjustments can be processed correctly.
When should you be requesting a T1 adjustment?
You have to make a t1 adjustment request when you notice errors after the CRA has already processed your return. For instance, if you omitted reporting certain income or did not claim an eligible credit, the CRA requests that you make a t1 adjustment request form instead of a new tax return.
It is always better to move quickly. The CRA has a 10-year policy to accommodate changes. For example, in 2025, you can request to adjust tax years 2015. If you are not certain whether you should do something, remember that fixing errors can result in additional refunds, reduced tax owed, or simply the peace of mind of knowing your return’s correct.
How to Submit a CRA T1 Adjustment Request
CRA offers a range of ways to make a cra t1 adjustment request and they are convenient and straightforward. The most used method is the CRA My Account portal and you can make your request online. This is usually the fastest method, and you can track your request easily.
Or you might complete a paper cra form t1 adjustment request (T1-ADJ) and mail it to your local tax centre. It will take longer, but it is still there for those who prefer to do things the old-fashioned way. Make sure to attach supporting documents such as receipts or slips that support your adjustments.
Some tax experts also assist in preparing t1 adjustment requests to make sure the process is conducted effectively and correctly.
Critical Documents Required for a T1 Adjustment Application
Accuracy and documentation for a t1 adjustment request are crucial when you file it. The CRA may ask for proof of your changes, so being prepared beforehand or during filing is recommended. Documents that are normally requested are:
- New T-slips (T4, T5, etc.)
- Receipts for credits and deductions
- Medicine or child care expense statements
- Education and fee arrangements
If you’re filing a paper t1 adjustment request form, send duplicate copies to avoid delays. For e-filing, retain photocopies in case the CRA requests additional information. The more clearly your supporting information is presented, the faster your CRA change tax return after filing will be processed.
How Long Does a T1 Adjustment Request Take?
Processing times for a t1 adjustment request are variable based on the method of submission and size of change. Online submissions are generally two weeks, and submissions on paper will take a maximum of eight weeks. Your account will be adjusted by the CRA when the adjustment is processed, and you will be issued a new Notice of Assessment.
It should be noted that changes with numerous years or significant dollar amounts are more time-consuming. Tracking your application via the CRA My Account portal informs you throughout the process.
Professional Help with T1 Adjustment Requests
While most Canadians do their own tax adjustments, it is possible to save time and stress by having a professional do it. Your own Mississauga tax accountant will walk you through the procedure so that your request is properly prepared and supported with the appropriate documents. Find out more here: personal tax accountant mississauga.
Tax professionals come in handy if your adjustment has complicated deductions, more than one year, or business income. With their guidance, you can have the assurance that your corrections are submitted correctly and without the need to wait unnecessarily.
Final Thoughts
Errors on tax returns happen to anyone, but it doesn’t have to be a worrisome experience. Filing a t1 adjustment request makes your tax account correct, whether it is changing income, claiming overlooked deductions, or changing personal information. Knowing how to employ the cra t1 adjustment request, filling out the proper cra form t1 adjustment request, and knowing what is a t1 adjustment request, you can be in control of your tax scenario.
Either way, if you do it yourself or take the recommendation of experts, immediate corrections not only cost you less money but also keep you in good standing with the CRA.