Kickstart Your Other Accounting Services in Mississauga Today
This page is your practical, step-by-step guide to starting an Other Accounting Services business (NAICS 541219) in Mississauga. You’ll get a clear overview of the 12 requirements to operate legally and smoothly—from business registrations and tax accounts to insurance, software setup, and client data security. We break down the permits you may need, the expected costs, and a realistic timeline so you can plan with confidence.
What you’ll learn: a practical checklist for each requirement, where to apply for registrations (ServiceOntario and the CRA for GST/HST), and which permits or registrations apply to your setup. You’ll see typical startup costs (registration fees, insurance, software, marketing) and the expected timeline from planning to launch. Plus, actionable tips on setting up trust accounting, data security, and choosing the right accounting tools.
Why Mississauga works: this city’s thriving business community, proximity to Toronto, and strong support for small firms create a great environment to grow an accounting practice. With relatively lower overhead and access to diverse clients, launching 541219 services here is a smart move.
Requirements Overview
The most critical requirement for operating an accounting services business in Mississauga is Chartered Professional Accountant (CPA) License. This is legally required and you cannot operate without it. In Ontario, you must hold the CPA designation and the Ontario CPA Licence to practice as an accountant, so this requirement is non-negotiable and foundational to offering professional services.
On the operational side, focus on health, safety, and the necessary permits and registrations. Ensure you meet Occupational Health and Safety Act (OHSA) requirements and have WSIB coverage to protect you and your staff. You’ll also need to comply with Employment Standards rules and set up Payroll Deductions Registration for employee withholdings. Protect client data and your practice by achieving PIPEDA compliance, and safeguard your business with Professional Liability Insurance (Errors & Omissions). Finally, obtain a Business Licence to operate in Mississauga and complete the Ontario Business Name Registration (ServiceOntario) so your company name is properly registered.
For business registration and tax, you’ll want to secure the basics with the right numbers and registrations. Start by registering for a Business Number (BN) with the Canada Revenue Agency (CRA) to handle taxes, payroll, and other filings. If you expect to make taxable sales in Canada, register for GST/HST. Also ensure Payroll Deductions Registration is in place so you can properly remit CPP, EI, and income tax on behalf of employees.
Next steps: confirm your CPA license requirements with CPA Ontario (and ensure any Ontario-specific licensing is up to date), set up the CRA accounts you need, and build a simple compliance calendar (licensing renewals, insurance, privacy policies, and quarterly tax filings). With these basics in place, you’ll be on solid ground to start an accounting services business in Mississauga.
Detailed Requirements
Here are the specific requirements for starting a other accounting services in Mississauga:
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Chartered Professional Accountant (CPA) License RequiredUse of the CPA designation and provision of public accounting services requires CPA certification through CPA Ontario. Includes education, experience, and examination requirements, plus continuing professional development. Complete CPA certification through CPA Ontario: prerequisite education, PEP program, CFE exam, 30 months practical experience. For public accounting: additional 24 months under licensed PA. CFE in September annually. New CPA Professional Program launching 2027. All requirements must complete by Dec 2028 under current program. Contact: 416-962-1841.
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Ontario Chartered Professional Accountant (CPA) Licence RequiredAccountants providing public accounting services (audits, reviews, compilations) must hold CPA designation and public practice licenses from provincial CPA regulatory bodies. CPA designation requires completion of CPA Professional Education Program (PEP), passing Common Final Examination (CFE), and practical experience requirements (30 months). Public practice license requires additional practical experience in public accounting, completion of in-depth tax and assurance modules, professional liability insurance, and compliance with quality assurance standards. CPA members must complete annual continuing professional development (CPD), maintain independence standards, and follow professional and ethical standards. Provincial CPA bodies conduct practice inspections of public accounting firms. Non-CPAs cannot use CPA designation or provide reserved services. Each province regulates through CPA provincial body operating under national CPA Canada framework. To become a CPA in Ontario: 1. Complete CPA prerequisite education 2. Enrol in CPA Professional Education Program (PEP) 3. Complete practical experience requirements 4. Pass Common Final Examination (CFE) 5. Register with CPA Ontario 6. For public accounting: obtain PAL (renewed annually Oct 31)
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Business Number (BN) Registration RequiredA 9-digit Business Number is required for most businesses operating in Canada. It is used to interact with the Canada Revenue Agency and other federal programs. Required for GST/HST, payroll, corporation income tax, and import/export accounts. Register FREE online through Business Registration Online (BRO) at canada.ca. Takes 15-30 minutes. As of November 3, 2025, online registration is MANDATORY for new BNs - phone registration no longer available. You'll need: business name, address, owner SIN, business type, and start date. BN (9-digit number) issued INSTANTLY online. Available 21 hours/day, 7 days/week (closed 3-6am ET for maintenance).
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Personal Information Protection and Electronic Documents Act (PIPEDA) Compliance RequiredProfessional services that collect, use, or disclose personal information must comply with PIPEDA federal privacy law. Includes consent requirements, security safeguards, and breach notification obligations. No registration required - compliance law. Follow PIPEDA's 10 fair information principles when handling personal data: accountability, identify purposes, consent, limit collection/use/retention, accuracy, safeguards, openness, individual access, challenging compliance. Appoint someone responsible for privacy. Penalties: up to $10M or 3% global revenue under proposed Bill C-27. Contact: Office of the Privacy Commissioner 1-800-282-1376.
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Business Licence RequiredGeneral business licence required to operate a business in City of Mississauga. Apply to City of Mississauga for Business Licence: 1. Determine business category 2. Complete business licence application 3. Submit required documents (ID, lease, zoning confirmation) 4. Pay application and annual fees 5. Await approval and receive licence Contact City of Mississauga Business Licensing for specific requirements. Home-based businesses may have different requirements. Annual renewal required.
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Ontario Business Name Registration (ServiceOntario) RequiredBusinesses in Ontario operating under a name other than the owner's legal name must register with Ontario Business Registry through ServiceOntario. This includes sole proprietorships, partnerships, and business names for corporations. Registration provides legal protection for the business name within Ontario and is required for banking, licensing, and business operations. Registration can be completed online through Ontario Business Registry. Business name registrations must be renewed every 5 years. Register business name with Ontario Business Registry: 1. Search Ontario Business Registry (free) for name availability 2. Consider NUANS name report ($25) for thorough search 3. Register online through Ontario Business Registry 4. Pay registration fee ($60 for sole proprietorship/partnership) 5. Receive 9-digit Ontario Business Identification Number (BIN) 6. Registration valid for 5 years 7. Renew before expiry
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Occupational Health and Safety Act Compliance RequiredAll Ontario workplaces must comply with the Occupational Health and Safety Act to ensure safe working conditions. Requirements include workplace safety policies, training, hazard assessments, and incident reporting. No registration - compliance law. Must post OHSA in workplace. JHSC required for 20+ workers (or 6+ in designated industries). Nov 2025: New administrative penalty scheme, defibrillator reimbursement. Telework now covered. Fines: up to $500K individuals, $1.5M corporations. 27 regulations under OHSA. Must conduct safety audits, maintain training records. Contact: 1-877-202-0008.
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Employment Standards Compliance ConditionalApplies if you have employees. Covers minimum wage, hours of work, vacation pay, public holidays, termination notice, etc. All Ontario employers must comply with the Employment Standards Act, covering minimum wage, hours of work, overtime, vacation, termination, severance, and other workplace rights. No registration required - compliance-based requirement. Follow Employment Standards Act (ESA) for minimum wage, hours of work, overtime, vacation, leaves, and termination. Post ESA poster in workplace (free download from ontario.ca). Keep employment records for 3 years. NEW for 2025: Employers with 25+ staff must provide written employment info to new hires by July 1, 2025. Job postings must include salary ranges by Jan 1, 2026. Call 1-800-531-5551 for help.
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GST/HST Registration ConditionalRequired if annual taxable revenue exceeds $30,000 (small supplier threshold). Taxi/ride-share drivers must register regardless of revenue. Businesses with gross revenues over $30,000 in any single quarter or over four consecutive quarters must register for, collect, and remit GST/HST. Small suppliers (under $30,000) may register voluntarily. Register FREE online through Business Registration Online (BRO) when your revenue exceeds $30,000 in any 4 consecutive quarters (small supplier threshold). Takes 15-30 minutes. You MUST register within 29 days of exceeding threshold and start charging GST/HST immediately on the sale that made you exceed it. Need your BN (or get one simultaneously). As of Nov 3, 2025, online registration is mandatory. Voluntary registration available anytime for input tax credits.
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Payroll Deductions Registration ConditionalRequired if you pay salaries, wages, or other remuneration to employees. Must register before first pay period. Required if you have employees. You must withhold Canada Pension Plan (CPP), Employment Insurance (EI), and income tax from employee wages and remit to CRA. Register FREE online through Business Registration Online (BRO) when you hire your first employee. Takes 15-20 minutes. You'll need your Business Number (BN) or can get one simultaneously. Payroll account (RP) added to your BN instantly. Register BEFORE your first pay date. Required to deduct CPP, EI, and income tax from employee wages. For 2025: CPP rate 5.95%, EI employee rate $1.66/$100 insurable earnings.
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WSIB Registration and Coverage ConditionalRequired within 10 days of hiring first employee, including family members and subcontractors. Workplace Safety and Insurance Board (WSIB) registration is mandatory for most Ontario businesses with employees. Provides compensation and support for workplace injuries and illnesses. Sole proprietors and partners can apply for optional coverage. Register FREE online at wsib.ca in 15-20 minutes. MANDATORY for most Ontario employers within 10 calendar days of hiring first worker. You'll need: CRA Business Number, payroll estimate, business activity description, owner/director info. Account number issued INSTANTLY online. Construction industry has expanded compulsory coverage. Premium rates vary by industry classification. Must display WSIB safety poster in workplace.
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Professional Liability Insurance (Errors & Omissions) RecommendedProfessional liability insurance (E&O insurance) protects against claims of negligence, errors, or omissions in professional services. Mandatory for most regulated professions and strongly recommended for all professional services. Required for many regulated professions in Ontario. Real estate (RECO): $500/yr for E&O. CPAs: firms must maintain PLI. Engineers (PEO): C of A holders need primary PLI. Insurance brokers: RIBO/OIC regulations. Typical coverage: $1M per claim/$2M aggregate. Profession-specific requirements vary. Check with regulatory college/association. Contact licensed insurance broker.
Funding & Grants
Available funding programs that may apply to your other accounting services:
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Cohort-based program supporting Quebec companies operating primarily in immersive/interactive digital content (VR/AR/MR, interactive scenographies, installations). Selected cohorts share a total funding envelope. First cohort (2024): 17 companies shared $7.5M; second cohort (2025): 11 companies shared $3.725M (~$340K–$440K per company). Video games, animation, VFX, and traditional formats are not eligible.
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Non-repayable project or composite (multi-year) grants for arts sector innovation, development, and support activities. Project grants normally up to $50,000; composite grants up to $50,000/year for multi-year periods. Exceptional projects may receive up to $100,000. Rolling intake — no fixed deadlines.
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The HIPP provided up to $200,000 over 9 months for Stage 1 proof-of-concept, with Stage 2 covering up to 75% of eligible expenses over up to 3 years (minimum 25% applicant cost-share). Eligible applicants included Alberta post-secondary institutions, government entities, health delivery agents, and for-profit or not-for-profit organizations. The program …
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A provincial personal and corporate income tax credit for arm's-length investors who purchase shares in certified eligible NL small businesses. The credit is 35% for businesses operating outside the North East Avalon region and 20% for businesses within the North East Avalon. Maximum annual credit is $50,000 per investor. Carry-forward: …
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The Invest Nova Scotia Payroll Rebate is a negotiated incentive for knowledge-based companies creating at least 20 net new full-time positions in Nova Scotia. The rebate is 5–10% of eligible gross payroll, disbursed annually over a set period (typically up to 5 years), after audited confirmation of job creation. Eligible …
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