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Payroll & source deductions · Oshawa

Payroll services in Oshawa

Durham payrolls are rarely tidy: crews that swell in spring, shift premiums on a shop floor, drivers paid by the mile, servers paid partly in tips. EverStone runs payroll for Oshawa employers remotely, with the CRA, WSIB and Employer Health Tax sides handled by one CPA on a written fixed scope.

Quick answer: An Oshawa employer withholds CPP, EI and income tax from every pay, remits them to the CRA on the schedule set for its payroll account. It reports to WSIB and pays Ontario Employer Health Tax once total Ontario payroll passes the exemption. T4 slips are due by the last day of February. EverStone runs the pays, makes the remittances and files the year-end, remotely and at a fixed fee. Payroll is included in monthly bookkeeping from $300 a month.

The federal deductions underneath every pay

Every Ontario pay starts with the same federal calculation: Canada Pension Plan contributions, Employment Insurance premiums and income tax, withheld from the employee and remitted to the CRA along with the employer’s own CPP and EI share. The deadline for sending it depends on how much the business withholds on average, and larger remitters send it more often. A late remittance draws a penalty even when the amount is right, so the schedule is set up before the first pay rather than learned from the first notice.

The CRA payroll account, the RP account, is separate from the HST account and the corporate account, and each carries its own balance. Payments applied to the wrong one are a common source of false arrears. Payroll remittances and the RP account explains how the schedule is assigned, and the remittance calendar lays out the dates.

Employer Health Tax, and how the rate is chosen

Ontario levies Employer Health Tax on remuneration paid to employees who report to an Ontario workplace. It is an employer cost, not a deduction from the employee. Smaller employers are fully covered by the annual exemption, but a growing Durham business crosses it sooner than expected, especially once overtime and bonuses are counted, because remuneration for EHT includes taxable benefits and bonuses as well as wages.

The rate is chosen from a graduated table using total Ontario payroll before the exemption, and only then is the exemption deducted from the taxable amount. Reading the table the other way round understates the tax. Associated employers, such as two companies owned by the same family, share one exemption and must agree how to split it. And a group with Ontario payroll above the upper limit gets no exemption at all. The current bands, exemption and limit are on the Ontario tax facts page, each with its source.

WSIB, and why construction is different

The Workplace Safety and Insurance Board is Ontario’s workplace insurance system, run separately from both the CRA and the Ministry of Finance. Most employers register, report insurable earnings and pay premiums at the rate for their industry class. Construction reaches further than other industries: coverage is compulsory for most construction businesses, and in many cases for independent operators and executive officers who would be optional elsewhere.

A Durham general contractor also carries exposure for the subcontractors it hires. If a sub is not registered and in good standing, the hiring contractor can be held responsible for its premiums. The protection is a WSIB clearance certificate, obtained before work starts and again before each payment. We keep that check in the payment routine rather than as an afterthought. Contractor accounting in Oshawa covers the rest of the construction file.

Ontario employment standards that reach the payroll

Some rules that shape a pay cheque come from Ontario’s employment standards rather than from tax law. Vacation pay accrues on wages and has to be paid out or given as paid time off. Public holidays carry their own pay calculation, which is easy to get wrong for part-time and shift staff whose hours vary week to week. Overtime applies above a weekly threshold for most employees. A final pay after a resignation or termination has its own timing, and a Record of Employment has to be issued. These are not optional extras; they are the lines a former employee checks first. See vacation pay and statutory holiday pay.

Durham payroll patterns, industry by industry

Each of Durham’s main industries puts its own strain on payroll:

  • Construction: crews that grow for the building season and shrink in winter, so Records of Employment are frequent, and WSIB applies to nearly everyone on site.
  • Manufacturing: shift premiums, overtime and larger headcounts that bring Employer Health Tax into play. See manufacturer accounting in Oshawa.
  • Trucking: drivers paid by the mile or the load, and the recurring question of whether a driver is an employee or an incorporated contractor. See trucking accounting in Oshawa.
  • Restaurants: tips and tip pools, where who controls the distribution decides whether CPP and EI apply. See restaurant accounting in Oshawa.

Year-end: T4s, T4As and the reconciliation

T4 slips, T4A slips and T5 slips are all due by the last day of February. Before the T4s go out, the year’s payroll has to agree three ways: what the pay records say was withheld, what was remitted to the CRA, and what the slips report. Differences are cheaper to fix in January than after the CRA sends a mismatch letter. Owners paid a salary by their own company get a T4 like anyone else, and the amount should match the decision made at the corporate year-end. Slip filing deadlines sets out each one.

About this article
EverStone CPA

Prepared and reviewed by a Chartered Professional Accountant at EverStone CPA, an Abbotsford CPA firm working with small businesses and incorporated contractors across the Fraser Valley and Canada. Updated September 2026. About the firm  ·  Book a free consult

Payroll obligations for an Oshawa employer

Payroll obligations for an Oshawa employer Who you report to, and what for — for a business operating in Oshawa, Ontario
ObligationWhat it involves
CRA source deductionsCPP, EI and income tax withheld and remitted on your assigned schedule
Ontario Employer Health TaxEmployer-paid tax on Ontario remuneration above the exemption
WSIBRegistration, insurable earnings reported, premiums paid by industry class
Year-end slipsT4 and T4A slips by the last day of February; ROEs as employees leave
Sales tax where you operate13% HST, a single registration and a single return

Source: Payroll services in Canada. General information, not advice.

In Oshawa, EverStone also works with realtors.

Common questions

Oshawa payroll questions

Does my Oshawa business have to pay Employer Health Tax?+
Only once total Ontario payroll passes the annual exemption, and associated employers share one exemption. The rate is chosen from payroll before the exemption is deducted. Current figures are on the Ontario tax facts page. Ask about your case →
Do I need WSIB coverage?+
Most Ontario employers do, and construction businesses face compulsory coverage in more situations than other industries. If you hire subcontractors, get a clearance certificate for each one.
Are tips subject to CPP and EI?+
It depends on who controls them. Tips the employer collects and distributes are generally treated as pensionable and insurable; tips paid directly by customers to staff generally are not.
When are T4 slips due?+
By the last day of February for the previous calendar year, along with the T4 summary. T4A and T5 slips have the same deadline.
What does payroll cost?+
It depends on headcount and pay frequency, and it is quoted as a fixed fee. For trades corporations, bookkeeping, payroll and the year-end T2 together usually run $450 to $650 a month. See pricing.
Is payroll run from a Durham Region office?+
No. EverStone runs payroll remotely from Abbotsford, British Columbia, with remittances and filings made online.
Do you work with businesses outside Oshawa itself?+
Yes. Employers in Whitby, Ajax, Pickering, Clarington and the rest of Durham Region are set up the same way as those in Oshawa: payroll runs remotely, remittances are scheduled, and the fee does not change with the address.

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A reply from a CPA within one business day, usually sooner — and a fee fixed in writing after a free consultation.

What happens when you get in touch

Payroll in Oshawa runs on the same federal rules and the same fixed fee as anywhere else we work.

  1. A free thirty-minute conversation. How many people, how they are paid, and what the CRA is already expecting from your RP account.
  2. The account and the calendar, before the first run. Your remitter type sets your due dates, and those go in the calendar at the start rather than after the first missed remittance. WSIB and Employer Health Tax accounts are confirmed at the same time; if you are hiring for the first time, your first employee lists what has to be in place.
  3. Every run, then the year end. Deductions calculated and remitted on schedule through the year, pay records posted to the monthly books, then T4s and the T4 Summary filed by the end of February.

Book a free consultation to get set up, or ask a payroll question before you commit to anything.

Ontario payroll handled properly

Remittances, WSIB and Employer Health Tax handled by a CPA, remotely. Book a free, no-obligation consult.

Remote payroll for Oshawa from Abbotsford

Payroll for Oshawa and Durham Region employers is delivered remotely from Abbotsford, British Columbia. There is no Oshawa office and no local team. Remittances and filings are made online, and the CPA running the payroll is the one you call with a question.

Talk to a CPA about this

One Chartered Professional Accountant, start to finish. Fixed fees, quoted in writing before any work begins, and no obligation from a first conversation.