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At Tax Filings Canada, we handle every part of your t4 and t4a amendment, from the filing itself to the planning around it. Our accountants work with corporations and business owners every week, so you can focus on running and growing your business.
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Yes — t4 and t4a amendment can be handled entirely online. Tax Filings Canada covers payroll runs, CPP/EI withholdings, T4 slips and records of employment for employers from their first hire to multi-province teams at affordable fixed fees, pay-after-service.
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| Factor | Tax Filings Canada | Typical Firm |
|---|---|---|
| Pricing model | Fixed, flat fee | Hourly / unpredictable |
| Payment | Pay after service | Upfront retainer |
| Price match | Yes, on written quotes | Rarely |
| CRA audit support | Included | Billed extra |
| Typical turnaround | 3-5 business days | 2-4 weeks |
T4 slips and the T4 Summary are due the last day of February; each missed slip carries its own penalty, scaled to how many are late. Late payroll remittances draw penalties of 3% to 10%, doubling to 20% for a repeat failure with gross negligence in the same calendar year. Because the fee is fixed and affordable, the economics stay predictable whether your file is simple or messy.
A few notes from the files we actually work on, because t4 and t4a amendment is decided by details that never make it into a brochure.
Everything in t4 and t4a amendment hangs off a single anchor. Remitter frequency follows average monthly withholding. A business that grows into the accelerated threshold keeps remitting monthly at its peril. The deadline moves before the CRA writes to say so.
There is a companion rule that changes how the first one plays out in practice: Late payroll remittances draw a penalty of 3% to 10% depending on how late. The penalty doubles to 20% for a repeat failure with gross negligence in the same calendar year. The third rule is where the real exposure hides. Source deductions are held in trust for the Crown from the moment they are withheld, which is why directors can be personally liable for unremitted amounts under section 227.1. Unlike most corporate debts, this one can follow the directors personally after the company is gone.
The practical upshot is simple: every one of these rules has a version that helps you and a version that costs you, and which one applies depends on choices made before filing. That is precisely the ground a tax expert covers. Here is what to have on hand so the t4 and t4a amendment work starts moving on day one.
You will see the finished work before it goes anywhere — review-before-filing is standard here, not an add-on. The fee is fixed up front, and nothing is payable until the service is done.
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See how our expert T4 and T4A Amendment tax and accounting services have helped Canadian businesses save money and stay compliant.
A home-care agency in Vancouver, British Columbia was scaling. The growth exposed remittances still going out monthly after the business had moved to the accelerated threshold. The back office was rebuilt to match, freeing $77,000.
A home-care agency in Vancouver, British Columbia was opening in a second province. That meant different filing obligations and a different payroll regime. Remittances still going out monthly after the business had moved to the accelerated threshold already sat in the file. We moved the account to the correct remitter frequency and caught up the arrears. We filed a taxpayer relief request that cancelled the bulk of the penalty. We then put monthly reporting in place. That let the owner see the cash effect of growth while there was still time to act on it. Growth was absorbed without a compliance failure. $77,000 of cash was released, and the monthly reporting now flags a problem while it is still small.
A charity with part-time program staff in Kitchener, Ontario was carrying $135,000 of penalties and interest. The charges arose from long-term contractors who met every test for employment. A relief application cancelled that amount.
An assessment of $135,000 landed at a charity with part-time program staff in Kitchener, Ontario following a desk review. It turned on long-term contractors who met every test for employment. The auditor had not seen the records behind it. We reconciled the payroll register, general ledger and T4 summary to the cent, then filed the amended slips. We then set out the legislative basis for the position alongside the documents supporting it. $135,000 of penalties and interest was cancelled under the taxpayer relief provisions, and the underlying assessment was adjusted to match the filed position.
A clinic paying its associates as contractors in Edmonton, Alberta faced a $93,000 proposed reassessment. It came after company vehicles used personally with no logbook and no taxable benefit reported. We rebuilt the documentation and the adjustment was withdrawn in full.
A clinic paying its associates as contractors in Edmonton, Alberta received a proposal letter opening a review of T4 and T4A amendment. The CRA had identified company vehicles used personally with no logbook and no taxable benefit reported. It proposed an adjustment of $93,000, with 30 days to respond. We treated the response as an evidence exercise rather than an argument. We filed the outstanding slips and summary and requested relief on the per-slip penalty with the reasons documented in writing. We then indexed every supporting document against the specific line the auditor had questioned. The proposed adjustment was withdrawn in full — all $93,000 of it. The file closed in 8 weeks with no change to the assessed amounts and no penalty.
A 3-week rebuild at a landscaping company with seasonal staff in Victoria, British Columbia got the filing in with 14 days to spare. That avoided $65,000 in penalties.
A landscaping company with seasonal staff in Victoria, British Columbia was weeks away from the deadline for T4 and T4A amendment. Behind that sat T4s that did not agree to the payroll register or the general ledger. The exposure if the date slipped was around $65,000. We reviewed each contractor against the CRA’s control and integration tests and converted those who met the employment tests. We priced the transition before it was forced by a ruling. The filing went in complete rather than provisional, so there was no amended return to follow. Filed with 14 days to spare. $65,000 in late-filing penalties avoided, and the working papers are ready for the following year.
4 years of filings at a retail chain across two provinces in Winnipeg, Manitoba had never claimed the incentives the work qualified for. The review recovered $47,000.
A retail chain across two provinces in Winnipeg, Manitoba had been filing for 4 years. In that time, the incentives its activity qualified for were never claimed. Behind that sat remittances still going out monthly after the business had moved to the accelerated threshold. We tested each activity against the eligibility criteria rather than the description on the invoice. Then we paid the accrued bonus inside the 180-day window and kept the deduction in the year it was accrued. $47,000 in credits claimed, with the open prior years adjusted as well. The claim passed review without adjustment.
Closing the books at a restaurant with heavy seasonal turnover in Moncton, New Brunswick took 6 weeks. The cause was a bonus accrued to bring the year-end tax bill down and still unpaid more than a year later. It now takes 9 days.
The accounting file at a restaurant with heavy seasonal turnover in Moncton, New Brunswick had a weak foundation. It was built on a bonus accrued to bring the year-end tax bill down and still unpaid more than a year later. The year-end had taken 6 weeks each of the last three years. We wrote each pay code against its income tax, CPP and EI treatment. That way, a new benefit could not reach the payroll without a decision on how it was withheld. We also moved the reconciliations into the monthly cycle, so the year-end stopped being a rebuild. The file reconciles. Month-end closes in 9 days instead of 6 weeks, and the year-end is a review rather than a reconstruction.
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Direct answers to what Canadian business owners actually ask before hiring an accountant.
T4 and T4A Amendment starts at a fixed fee quoted before any work begins. The quote is locked at the outset and does not change mid-engagement, and you pay only after you have reviewed and approved the deliverable. Compare every plan on our transparent pricing page.
At minimum: prior-year returns and notices of assessment, your bank and credit-card statements for the fiscal period, payroll records if you have employees, and GST/HST filings. We send a checklist tailored to your situation after the free 15-minute call.
Most engagements are completed within 3 to 5 business days once your documents are complete. Catch-up work covering multiple years takes longer, and we tell you the realistic timeline before you commit rather than after.
We respond on your behalf at no extra charge for any return we prepared. Every figure we file is supported by documentation retained in your file, which is what turns a CRA review from a crisis into correspondence. See how our CRA audit representation works.
Yes. Late filing penalties compound at 5% of the balance owing plus 1% per month, so the cost of waiting is real. We prioritise catch-up work and, where eligible, file under the CRA's Voluntary Disclosures Program to reduce penalties.
Yes. We serve clients in every province and territory at the same fixed fees, so your location does not change the price or the service. Browse our coverage across Canada to find your city.
We work across construction, healthcare, e-commerce, professional services, restaurants, real estate, transportation, technology and non-profits, each with its own deduction profile and CRA scrutiny patterns. See all industries we serve.
Software applies the rules you already know about. An experienced tax accountant finds the ones you do not: capital cost allowance timing, the small business deduction threshold, shareholder loan repayment rules, and TOSI exposure on family dividends. The fee is usually smaller than the deductions it surfaces.
Our t4 and t4a amendment services include complete filing, compliance management, and strategic advice customized to Canadian tax laws.
You can start by booking a free 15-minute call. We will review your files, provide a fixed quote, and start working immediately.
Our answer starts where the legislation starts. Employers withhold CPP, EI and income tax and remit on a schedule set by their average monthly withholding. Late remittance carries a penalty of 3% to 10%, rising to 20% for a repeat failure with gross negligence in the same year. Payroll penalties compound quietly. An employer that drifts one cycle late each quarter can owe more in penalties than in the tax it was late paying. From there it is a matter of applying it to your year — and that application, not the rule itself, is where an accountant earns the fee.
You are asking the right question, and it has a real answer. Source deductions are held in trust for the Crown from the moment they are withheld, which is why directors can be personally liable for unremitted amounts under section 227.1. Unlike most corporate debts, this one can follow the directors personally after the company is gone. What we add on top of that is the paperwork discipline that makes the answer stand up if anyone ever asks you to prove it.
The questions Canadians actually search on this topic, answered plainly. Browse every question in the Canadian tax answers directory.
There is no single percentage. Your employer applies the federal withholding table plus the table for your province or territory, using pay frequency, your annual rate of pay and the amounts claimed on your federal and provincial TD1 forms, then adds CPP contributions and EI premiums until the annual maximums are met. Pension contributions, union dues and benefit premiums come off separately. The CRA's Payroll Deductions Online Calculator reproduces the exact figures shown on your stub.
EI benefits are taxable income. Service Canada withholds income tax before each payment reaches you, and the total benefits plus the tax withheld appear on your T4E for the year. That withholding follows a basic calculation rather than your full marginal rate, so people who also worked during the year often end up with a balance owing at filing. Asking Service Canada to withhold more, or setting money aside yourself, avoids a surprise. Higher-income claimants can also have to repay part of their regular benefits through the return.
Your employer projects your pay over the full year, applies the federal brackets to that annualised figure, subtracts the credits you claimed on your TD1 forms, and withholds a proportional share each pay period. The same is done for your province, so one deduction line reflects both. Employers use the CRA payroll deductions calculator or its published tables. Where large deductions mean too much is being withheld, Form T1213 can reduce it; processing takes several weeks, so the request should go in during the autumn before the year it is meant to apply to.
No. Age creates no exemption. Income tax is withheld from a young worker’s pay in the usual way, though many earn less than the basic personal amount and recover the withheld tax by filing a return. EI premiums apply at any age. CPP contributions begin with the month after the worker turns 18, so no CPP comes off before then. Filing anyway is worth it, because earned income builds RRSP room for later.
Line 12100 is interest and other investment income. It captures bank and term deposit interest, amounts shown on T5 slips, interest credited on savings bonds, income from certain annuities and the interest portion of some settlements. Report it even when no slip arrives, because institutions are not required to issue a slip for very small amounts. Dividends and capital gains have their own lines. The line number is unchanged from recent years, so software lists it under investment income.
Usually yes, if you are not registered. Non-resident digital suppliers such as ad networks and software subscriptions must register under CRA's digital economy rules and charge GST/HST to Canadian customers who are not registered themselves. If you give the platform a valid GST/HST number, it generally stops charging the tax and you account for it yourself where the rules require. Tax charged on genuine business purchases is normally recoverable as an input tax credit once you are registered.
Controlled tips do. Amounts the restaurant collects and controls, such as a mandatory service charge or a pool the house allocates, run through the books as revenue and then as wage expense when paid out, and a mandatory service charge on a taxable meal is generally subject to GST/HST. Voluntary tips passed straight to staff are not the restaurant's revenue and no GST/HST applies. Keep the two streams separate in your bookkeeping.
The principal you repay is never deductible, so clearing the balance faster brings no tax saving of its own. Only the interest portion of payments on an eligible federal or provincial student loan counts, and it produces a non-refundable credit rather than a deduction. Ask your loan servicer for the annual interest statement, because a bank record of the payment does not show the split. Interest you cannot use this year carries forward.
No. Canada has no joint return. Each spouse or common-law partner files a separate T1 reporting only their own income. What changes is the identification page: you tick married or common-law and give your partner's name, social insurance number and net income, which opens up couple-level credits and sets the income used for benefits. Most couples still prepare the two returns side by side so donations, medical expenses and pension splitting land on the better return.
Fees for elementary and secondary school, including most private school tuition, are not deductible. A portion may still count where the school separates it out: the child care element can qualify as a child care expense, and the religious instruction element is sometimes receipted as a charitable donation. Post-secondary study works differently, with the eligible institution issuing a tuition slip so the student claims a non-refundable credit that can be carried forward or partly transferred to a parent or grandparent.
Two different taxes are in play. GST/HST is not charged on long-term residential rent, which is an exempt supply, so the landlord adds no tax and cannot claim input tax credits on those costs. Commercial rent and most short-term accommodation are taxable once the landlord is registered, at 13% HST in Ontario or 5% GST in Alberta. Separately, the rent received is income to the landlord, reported on the T1 or T2 after deductible expenses.
Not always, but filing every year is usually the better choice. A return is required when you owe tax, when the CRA asks for one, and in situations such as disposing of property or repaying certain benefits. Even with no tax payable, filing keeps benefit and credit payments flowing, builds RRSP room and records tuition amounts or capital losses you can carry forward. Personal returns for the 2025 tax year were due 30 April 2026.
Reviewed and fact-checked by Udit Gupta
Ex Big 4 — Ernst & Young, Deloitte · International & cross-border tax specialist · CPA Canada (In-Depth Tax Program) · Chartered accountant, ICAI & MIA
Udit Gupta has over 15 years of experience helping corporations and business owners with corporate structuring, corporate tax filing, bookkeeping, payroll, GST/HST, cross-border tax and CRA representation. He is Big 4 trained, at Ernst & Young and Deloitte, and qualified as a chartered accountant in India and again in Malaysia. In 2014 he founded his accounting practice to serve entrepreneurs, startups and non-resident business owners across Canada. View full member bio.
The Institute of Chartered Accountants of India — member 521458 · Malaysian Institute of Accountants — member CA 44667 · Ex Big 4: Ernst & Young, Deloitte · CPA Canada (In-Depth Tax Program), completed 19 Dec 2023 · In-Depth GST/HST Part I, 12 Jul 2022 · Part II, 5 Jul 2023
Editorial policy. Every page is researched against primary sources — the Income Tax Act, CRA publications and CPA Canada guidance — and every rate or threshold is stated with the tax year it applies to.
Sources. CRA — Payroll · CRA — Keeping records · Income Tax Act (Justice Laws Website)
