How do you prevent payroll remittance surprises?

First, know your remitter type, because it sets every deadline

Most remittance surprises are really deadline surprises: the employer is remitting on the schedule it has always used while CRA expects a faster one. Your remitter type is assigned from your average monthly withholding amount, generally measured two calendar years back, which is exactly why it catches growing businesses. The payroll you ran two years ago sets the deadlines you must meet today, and a company that crossed the threshold back then can be put on an accelerated schedule now without anything visible changing in this year's payroll.

Two habits keep this table from hurting you. Check the remitter type printed on your CRA statements at the start of every year rather than assuming it carried over, because CRA does send a letter when your type changes and that letter is easy to miss in a January pile. And if your withholdings are trending toward $25,000 a month, plan for the switch before CRA imposes it; the mechanics of the faster schedules, and the cash-flow rhythm they force, are covered in what an accelerated payroll remitter is.

The due date is also about when the money arrives, not when you press pay. A remittance sent by online banking on the due date can settle a day later, and CRA measures receipt. Build the payment lead time into the calendar, and treat a due date that lands on a weekend or holiday as an instruction to pay early, not a debate to have with the penalty notice afterwards.

Reconcile the payroll account monthly, not at T4 time

The second class of surprise is discovered in February: the T4 summary says one number, the payroll account shows another, and someone owes the difference plus interest. The prevention is a monthly reconciliation that takes minutes when it is current. Each month, compare three numbers: what your payroll records say you withheld and owe as employer contributions, what your books show leaving the bank, and what CRA's statement of account shows received. All three should match to the dollar.

The gaps have familiar causes. A remittance posted to the wrong account or the wrong period, a payroll run recorded in the books but never remitted, an off-cycle payment, a manual cheque to a departing employee that bypassed the software, or an employer contribution calculated on the wrong earnings base. Found in the same month, each of these is a small correction. Found at T4 time, they arrive as a lump-sum liability, and by then the deadline for the money has long passed, so interest and penalty are already running.

CRA's own tools make this easier than it used to be. The statement of account and remittance history sit in My Business Account, so you or your accountant can pull the CRA side of the reconciliation without waiting for mail. After you file T4s, CRA also runs its own check, comparing the CPP and EI reported on the slips to what the earnings required; a discrepancy triggers a pensionable and insurable earnings review, and the employer is assessed for shortfalls, including amounts that should have been withheld from employees. A clean monthly reconciliation is what makes that review a non-event.

Watch the payroll events that change the number

The third class of surprise is a payroll event that changes the remittance while the routine stays the same. These are the ones we see most in files that come to us:

• Bonuses. A December bonus is withheld on when paid, which can multiply that period's remittance, and a large one can push your average withholdings over a threshold so the deadlines accelerate two years later.
• Taxable benefits. Personal use of a company vehicle, employer-paid group life premiums and similar benefits are income, and most of them attract CPP and some attract withholding through the year. Handled per pay period, they are routine; discovered at year-end, they create a true-up owed with the final remittance and amended payroll numbers.
• The second CPP ceiling. Since 2024 there is an additional CPP contribution range above the first earnings ceiling, so contributions for higher-paid people run further into the year than old habits expect, and the employer match runs with them.
• Owner compensation decided late. A salary or bonus accrued at year-end still has to be paid, withheld on and remitted on time once it is paid; the corporate deduction timing does not move the payroll deadlines.
• Terminations and retroactive pay. Vacation payouts, pay in lieu and retro adjustments all carry withholdings, often outside the normal cycle.
• New provinces. Hiring someone who works in another province changes the withholding tables and can add employer levies there; the wider picture is in what a multi-province business should review for tax compliance.

The discipline is to route every one of these through payroll before the money moves, not after. A bonus run through the shareholder loan account in December and papered in February is how a remittance surprise and a bookkeeping problem happen at the same time.

If you miss or under-remit, fix it fast, because the penalty scales with delay

The late-remittance penalty is graduated, so speed directly reduces cost. It starts at 3% of the amount for a remittance one to three days late, steps up through 5% and 7%, and reaches 10% when the amount is more than seven days late or not remitted at all. A second failure in the same calendar year, where it was made knowingly or through gross negligence, can be penalized at 20%. Interest compounds daily on top, at CRA's prescribed rate, from the day the amount was due.

Corrections are simplest inside the calendar year. An under-remittance caught in-year is generally fixed by remitting the shortfall right away and keeping the working paper that explains it; an over-remittance can usually be absorbed against the next period. Once T4s are filed, corrections mean amending slips and the summary so the reported and remitted numbers agree, and answering the CRA review if one has already started. If a penalty arrives from a genuinely exceptional cause, CRA has a taxpayer relief process for interest and penalties, but it responds to documented circumstances, not to being busy.

There is one more reason not to let this drift. Source deductions are trust amounts: money withheld from employees that was never yours. If a corporation fails to remit them, directors can be personally assessed for the unremitted amounts, with a due-diligence defence that depends on being able to show active oversight. That is why we tell owners to treat the payroll liability account as untouchable cash, and why a shortfall here is the one CRA debt we never advise financing by delay. If letters have already arrived, this is standard CRA Support work: establish the real balance, stop the penalty clock, and fix the process that caused it.

Put it on a compliance calendar, and keep the records that prove it

A payroll compliance calendar is the cheapest control in this whole area, because every date is known in advance. Ours for an Ontario employer typically carries: each remittance due date for your remitter type, a monthly reconciliation day, T4 and summary filing by the last day of February, the Ontario Employer Health Tax return where payroll is over the exemption, WSIB reporting where it applies, and an annual January check of the remitter-type letter, benefit setups and the new year's rate tables. Multi-province employers add each province's dates. This is ordinary CRA support and corporate compliance work for an Ontario CPA, and it is the difference between a payroll that runs itself and one that generates letters.

Retention is part of the same discipline. Payroll records, remittance confirmations, benefit calculations and T4 working papers must be kept for six years from the end of the last tax year they relate to, and they are exactly what a payroll examination asks for. Keep the proof of payment with the calculation it paid, so any period can be defended in one email.

Onboarding is where surprises are inherited. When payroll changes hands, to new software, a new provider or a new accountant, the remitter type, year-to-date withholdings, benefit configurations and any open CRA balances have to transfer with it, or the new system confidently produces wrong numbers. We rebuild that picture whenever we take payroll on inside an Ongoing Financial Partnership, where payroll runs within End-to-End Accounting rather than as a silo, because the person filing the T2 should be the same team watching the payroll account.

What changes the answer for your payroll

How much structure this takes depends on a handful of facts:

• Your remitter type and trajectory, since crossing $25,000 in average monthly withholdings rewrites the deadlines on a two-year delay
• Who actually runs payroll, because software defaults, a provider or a manual spreadsheet each fail in different ways
• Which taxable benefits are in play, vehicles and employer-paid premiums being the usual late discoveries
• Your bonus and owner-pay habits, especially December decisions that move money before payroll paperwork
• Where your people work, since each added province changes withholding and can add employer levies
• Your compliance history, because a first late remittance is a percentage and a repeat pattern is a much bigger one, plus a director-liability conversation

If any of those is moving this year, a free 15-minute discovery call is enough to tell you whether your remittance process will hold, and what a monthly rhythm would look like with one team running payroll, books and corporate filings together.

Source: CRA — Remitting source deductions.