- A Roadmap To CRA Compliance and Financial Stability
- Small Business Tax Obligations
- CRA Compliance Filing: Start Here
- Why You Should Amend Your Tax Return
Why You Should Amend Your Tax Return Before CRA Finds the Error
By L.Kenway BComm CPB Retired
This is the year you get all your ducks in a row! Start by starting ... and keep it simple. Consistency beats perfection.
Published March 30, 2026
WHAT'S IN THIS ARTICLE
Amend Your Return | If You Do Nothing | Why Amend? | Missing T slips | Self-Employed? | T4A Box 48 | Platform Economy | Moonlighting & Skimming | Find An Amendment | Action Checklist
NEXT EXPLAINER >> How To File and Pay Your Taxes Using CRA's Online Portal
BACK TO >> Compliance Filing Basics
Got a T4A that does not match your invoices? Here is what to do.Picture this. You filed your tax return before February 28th, breathed a sigh of relief, and moved on. Done for another year. Then a T slip arrives in the mail. Or you log into your Canada Revenue Agency (CRA) My Account to get your Notice of Assessment in late March and thought you'd just check All-Slips again. You spot something that was missing when you filed. Your stomach drops a little. Now what?
Here is the good news. This happens to a lot of Canadians, and it is fixable. The key is acting quickly (before April 30th would be excellent!), because what you do next determines whether you pay just the tax you owe or the tax plus a painful penalties or interest on top.
What Actually Happens If You Do Nothing
The CRA runs what is called a matching program. Every T slip issued by your employer, your contractor, your gig platform, your bank, or a trust company is also sent electronically to CRA. That means CRA knows what income you received, even if you forgot to report it. This is not a maybe. It is an automated process that runs every single year.
Here is how the consequences stack up if CRA finds the unreported income before you report it yourself.
- First time it happens: CRA adjusts your return, sends you a Notice of Reassessment, and charges you interest on the unpaid tax. Interest is calculated daily from your original filing due date, so the longer it sits, the more it costs.
- Second time it happens: The interest is still there, but now CRA also adds a 20 percent penalty on the unreported income. That is 10 percent under the federal Income Tax Act and an additional 10 percent under your provincial Tax Act.
Real World Scenario
To put real numbers to this, say you had $2,000 in unreported gig platform income and your combined federal and provincial tax rate is 30 percent. The tax owing is $600. A 20 percent penalty adds $400 on top of that. Then daily interest compounds on the full balance from the original due date. For a solopreneur watching cash flow, that is a hit that could have been avoided entirely.
Why Filing An Amendment Changes Everything
When you file an amendment before CRA finds the error through their matching program, you change your outcome significantly.
You still owe the tax if it's applicable. You still pay interest from the original due date if there is a balance owing (which is April 1st). But you avoid the penalty entirely on a first occurrence. And importantly, you reset the clock on the second-offence rule.
You are not getting away with anything. You are simply paying what you owe without the punishment layer on top. That is a meaningful difference.
A Word About Late and Missing T Slips
Before we get into how to file an amendment, it helps to understand why late slips happen in the first place, because this is more common than you might think.
The CRA receives copies of your T slips from gig platforms, contractors you worked for, employers, financial institutions and other issuers. They do not issue the slips themselves. The general deadlines are as follows.
T4 employment income slips, T4A other income, and T5 investment and dividend income slips are due from issuers by the end of February. T3 trust income slips, which cover things like mutual fund distributions, are not due until the end of March. That means if you file your return in February or early March, you may not yet have all your slips in hand.
To make things more complicated, fewer and fewer slips arrive by mail these days. Many Canadians now rely on CRA's All-Slips view inside My Account and Auto-fill My Return service included in tax software programs to gather their information at tax time.
In 2025, this caused real frustration. CRA introduced stricter validation processes for incoming data from employers and financial institutions, which caused widespread delays. Many slips were not available in the portal until late March or even mid-April, well into tax season. Because people had grown accustomed to relying on the digital service, paper copies were not as readily available as they had been in past years.
The practical takeaway is this. Before you file, log into your CRA My Account and check the All-Slips view. Compare what is there against what you are expecting. If something is missing, do not contact CRA. You need to go directly to the issuer, your gig platform, your employer or your financial institution, and request a copy. CRA cannot post a slip until the issuer sends it to them, and if there is an error in your name, address or Social Insurance Number on the slip, it may not appear in your account at all.
The 2026 tax season appears to be going more smoothly, but the lesson from 2025 stands. Do not assume the portal has everything. Verify before you file.
If You Are Self-Employed, Pay Extra Attention Here
If you are a solopreneur, freelancer or self-employed Canadian, the missing slip conversation has some specific wrinkles worth knowing about.
1. The T4A Box 48 Situation
If you provided services to a business as an independent contractor, that business is legally required to report what they paid you to CRA using a T4A slip. Specifically Box 48, which covers fees for services. Any payments over $500 in a calendar year must be reported.
Here is where it gets interesting for solopreneurs right now.
This reporting requirement has been on the books for years, but compliance has been uneven. In 2011, CRA introduced a moratorium on penalties for businesses that failed to complete Box 48 on the T4A slip. The idea was to give businesses time to get familiar with the requirement. That temporary measure has been in place ever since, which means many businesses simply got out of the habit of issuing T4A slips for fees paid to contractors.
That is changing. As of December 2025, CRA lifted that moratorium for the trucking industry, and Budget 2025 introduced funding for CRA to implement a focused compliance program around fees for service reporting more broadly. The direction of travel is clear. CRA is moving toward stricter enforcement of T4A Box 48 reporting across industries, not just trucking.
What this means practically is that you may start receiving T4A slips more consistently from clients who have not issued them in the past.
IF You Receive A T4A Box 48 Slip
The first thing to understand is that receiving a T4A slip does NOT create new income. It reports income you were already responsible for declaring. Your obligation to report your self-employment income has always existed regardless of whether a client issued a slip. CRA is simply getting better at verifying it.
The T4A Box 48 amount belongs on your T2125 Statement of Business or Professional Activities, not on an employment income line. Your tax software will have a specific field for T4A Box 48 fees for services on the T2125. By entering the T4A slips into the tax program, it will put the income on correct line of your T2125 tax form.
🦆 Here is the critical point
You must make sure you are not double counting. If you have already included that client invoicing in your total business income on the T2125, entering the T4A Box 48 amount in the designated field on tax form T2125 means you need to back the same amount out of your other reported income. The T4A amount and your other business income together should equal your total gross revenue, not exceed it.
The practical approach is to reconcile each T4A slip you receive back to your own income records. Match the slip amount to the invoices you issued for that client. Investigate any differences. A difference could mean the client made an error on the slip, which you would need to be corrected, or it could reveal income you missed tracking in your own records.
If you really have a mix of income with slips and income without slips, You could reclassify (using an adjusting journal entry) the T4A slip income to a separate revenue account in your books. That keeps it clean and helps you determine if you've reported everything. This is just optional reporting in your books if you are having trouble keeping things straight.
For a detailed walkthrough of where T4A income goes on your T2125 and how to handle it in your return, see my article on CRA subcontracting reporting requirements.
If You Do Not Receive A T4A Slip
Not receiving a T4A slip does not change your reporting obligation one bit. You are still required to report all your self-employment income. Remember, the moratorium that has been in place means many businesses have not been issuing these slips consistently. You can't assume this means CRA is unaware of the payments. As enforcement tightens, the matching program becomes more effective.
If you have been keeping good records and reporting all your income accurately, a T4A slip arriving after you filed is simply confirmation of income you already reported. No amendment is needed. Just reconcile the slip against your records to confirm everything matches and file it away.
🦆 An amendment only becomes necessary if the T4A reveals income you did not report. That is the situation you want to get ahead of before CRA finds it first.
A Note On Self-Employment Taxes
As an independent contractor, you are responsible for calculating and remitting your own taxes. The businesses that hire you are not responsible for withholding or remitting tax on your behalf the way an employer would for an employee. That means no one is setting aside your CPP contributions or income tax installments for you. That is your job.
This is worth keeping in mind when a T4A slip arrives. It is not a surprise tax bill. It is a record of income you were already responsible for managing. The amendment process exists for situations where the timing of receiving that slip did not line up with when you filed.
2. Platform Economy Income Is On CRA's Radar
If you earn income through online platforms, whether that is ride-sharing, short-term rentals, freelance marketplaces, delivery services or any other digital platform, you need to know that CRA has made platform economy income a specific audit focus for 2026.
This is not a surprise. Canada, along with many other countries, has been moving toward requiring platforms to report what they pay to sellers and service providers directly to tax authorities. CRA is actively working to match that data against what individuals report on their returns.
If you have platform income that was not fully reported in a prior year, now is the time to get ahead of it. An amendment filed before CRA initiates contact puts you in a far better position than waiting to receive a letter. For more on how platform economy income fits into your overall tax picture, see my overview on the Bookkeeping-Essentials.ca home page. I explain how the CRA defines the platform economy. In 2024, CRA rolled out new reporting requirements.
A Straight Talk Moment About Moonlighting and Skimming
This section would not be complete without addressing something directly. Some self-employed people are tempted to simply not report cash income, under-report what platforms paid them, or keep two sets of books. This is NOT a grey area. It is tax evasion, and it is illegal.
There is an important distinction worth understanding.
- Effective tax planning means legally arranging your affairs to minimize the tax you owe. Using legitimate deductions, income splitting where permitted, and contributing to your RRSP are all examples of legal tax planning that every self-employed Canadian should be doing.
- Tax evasion means deliberately hiding income or falsifying records to avoid paying tax you legally owe. That is a criminal matter.
- Tax avoidance includes unacceptable and abusive tax planning. The General Anti-Avoidance Rule gives CRA the authority to challenge these arrangements.
What is skimming and moonlighting exactly? Let's define the terms plainly.
- Moonlighting in the tax evasion context means working for cash on the side and simply not reporting that income to CRA. It is not the moonlighting itself that is illegal. Lots of solopreneurs build their business on the side while still employed. The illegal part is pocketing the cash and leaving it off your tax return entirely.
- Skimming means taking a portion of your business revenue before it ever gets recorded in your books. Cash comes in, some of it goes straight into your pocket, and only the remainder shows up in your income records. It is one of the oldest forms of tax evasion and one of the first things CRA looks for when business income seems inconsistent with lifestyle or industry norms.
Both are forms of tax evasion. Both are deliberate. And both are illegal under the Income Tax Act.
The distinction that matters is intent. Making an honest mistake on your return, missing a slip, or miscategorizing an expense is not evasion. CRA distinguishes between errors made in good faith and deliberate concealment of income. The amendment process exists precisely for honest mistakes. Skimming and moonlighting are not mistakes. They are choices, and CRA treats them accordingly.
The consequences of tax evasion are serious. CRA can assess penalties and interest going back many years. In more serious cases, charges can be laid under the Income Tax Act, and a conviction can result in fines and even imprisonment.
The underground economy is one of CRA's ongoing enforcement priorities, and the matching program, combined with platform reporting requirements, is making it increasingly difficult to hide income that has already been reported by a third party.
If you have unreported income from prior years, the smartest move is to come forward voluntarily BEFORE CRA comes to you. Canada's Voluntary Disclosures Program exists for exactly this situation and can significantly reduce or eliminate penalties in some cases, though interest is generally still owed. (But it is really important that you get legal advice first before you do this. There is a right way and a wrong way to go about this and legal counsel will explain the right way.)
For a full explanation of the difference between tax avoidance, tax evasion and effective tax planning, and what each one means for your business, see my article on the underground economy and tax planning.
How to File An Amendment
The good news is that filing an amendment is not complicated and it does not automatically trigger a full audit. CRA has made this process much easier in recent years.
Once you receive your Notice of Assessment (NOA) for the return you need to change, you have two main options. Do not file a request until you receive your NOA.
- Use Change My Return in My Account. This secure online service lets you request changes for up to 10 previous calendar years. It walks you through common changes, including adding missing T slips. Online requests are typically processed within two weeks, compared to eight weeks or more for paper requests.
- Use ReFILE if you filed with NETFILE-certified tax software. This option lets you submit changes directly through your tax software for the last four years which as of this writing is 2025, 2024, 2023, and 2022 tax years. You will receive notifications if additional information is needed or if supporting documents are required.
🦆 DO NOT file a new return. That is a common mistake. You are requesting a change to the return you already filed, not starting over.
After CRA reviews your request, you will receive a Notice of Reassessment showing the changes made, or a letter explaining why changes were not made. If you are owed a refund as a result of the amendment, it will be issued at that time.
One important reminder. Keep all your receipts, slips and supporting documents for at least seven years after you file. CRA may request a review at any time, and they may ask for bank statements or cancelled cheques in addition to official receipts.
For an idea of what the CRA portal can do these days, see my mini-guide on how to file and pay your taxes online using the CRA portal.
What If You Owe Money You Cannot Pay Right Now
Filing the amendment and paying the balance are two separate things. File the amendment promptly regardless of whether you can pay immediately. Getting the amendment on record stops the penalty clock. Then you can work out the payment.
If you cannot pay the full amount right away, CRA may allow you to set up a payment arrangement. In some cases, if circumstances beyond your control affected your ability to meet your tax obligations, CRA may also grant relief from penalties and interest.
For more on your options, see the steps to take on what to do if you cannot pay your taxes.
Your Quick Action Checklist
Before you file each year, and after you file, run through this list.
- ☐ Log into CRA My Account and check the All-Slips view before filing. Compare what is there to what you are expecting based on your income sources. Do this even if you had a tax preparer file your return.
- ☐ If a slip is missing from the portal, contact the issuer directly. Do not wait for CRA to sort it out.
- ☐ File your return only when you have all your slips in hand. Waiting a few extra days is far less painful than filing an amendment.
- ☐ If a slip arrives after you have already filed, do not wait until next year to deal with it. File a T1ADJ amendment using Change My Return or ReFile as soon as you receive your Notice of Assessment.
- ☐ Pay any balance owing, or arrange a payment plan with CRA if you cannot pay in full. This can be done by phone or using Manage Balance in My Account or My Business Account.
- ☐ Keep copies of everything, your return, your Notice of Assessment, your Notice of Reassessment, and all supporting documents, for at least seven years.
Common Compliance and Filing Problems Solved
This explainer is one of three covering tax compliance and filing for Canadian solopreneurs.
