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GST, QST, HST & Indirect Tax Services in Montreal
One firm for everything—accurate GST/QST/HST registration, filings, audit defense, and full-cycle accounting that keeps your business compliant and cash-flow strong.
35+
years filing indirect taxes across Quebec
1k+
businesses supported annually
99%
on-time GST/QST/HST submissions
<5
days typical filing turnaround for standard periods*
Our Core Indirect Tax & Compliance Services
GST/QST/HST Registration & Account Setup
We assess nexus, determine filing frequencies, and register your accounts correctly with CRA and Revenu Québec—so you’re compliant from day one.
Preparation & Electronic Filing
Accurate period-end returns (monthly/quarterly/annual), remittances, and reconciliations—filed electronically with confirmations and audit-ready workpapers.
Input Tax Credit (ITC/ITR) Recovery
Systematic capture and documentation of recoverable taxes to prevent leakage—improving cash flow and reducing effective tax cost.
Audit Representation & CRA/ARQ Correspondence
Direct representation with tax authorities—responses, reconciliations, and defense packages that reduce adjustments, penalties, and interest.
E-Commerce & Multi-Province Compliance
Marketplace rules (Shopify, Amazon, Etsy), destination-based rates, and cross-border obligations—automated, accurate, and scalable as you grow.
End-to-End Accounting Integration
CPA-supervised bookkeeping, payroll, and T2 support—clean ledgers and bank-ready financials that align with every indirect tax return.
The Mackisen Advantage
Coordinated team of CPAs, auditors, and tax lawyers under one roof
Bulletproof reconciliations and documentation to withstand audits
Proven playbooks for retail, e-commerce, construction, real estate, manufacturing, and services
Cloud bookkeeping, secure portal, and automated workflows for accuracy and speed
Cash-flow focused approach: maximize ITCs/ITRs and optimize remittance timing
Bilingual, confidential service with clear timelines and fixed scopes
* Turnaround assumes complete records and standard complexity; timelines may vary.
01
Do you offer bilingual service (EN/FR)?
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How do your fees and packages work?
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What industries do you specialize in?
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Do you offer a free consultation?
01
Do you offer bilingual service (EN/FR)?
02
How do your fees and packages work?
03
What industries do you specialize in?
04
Do you offer a free consultation?
01
Do you offer bilingual service (EN/FR)?
02
How do your fees and packages work?
03
What industries do you specialize in?
04
Do you offer a free consultation?
File Clean. Avoid Penalties.
Book a free indirect tax consultation—our CPA team will register, reconcile, and file your GST/QST/HST, defend audits, and integrate everything with your accounting.
Talk to an expert
File Clean. Avoid Penalties.
Book a free indirect tax consultation—our CPA team will register, reconcile, and file your GST/QST/HST, defend audits, and integrate everything with your accounting.
Talk to an expert
File Clean. Avoid Penalties.
Book a free indirect tax consultation—our CPA team will register, reconcile, and file your GST/QST/HST, defend audits, and integrate everything with your accounting.
Talk to an expert
Trusted by 5000+ customers
Trusted by 5000+ customers
4.7
From 100+ ratings
Caroline
Review on Google
I can confidently say that they deliver a level of service that goes beyond expectations. From the very beginning, I felt like I was in good hands.
Mary Michelle Reyes
Review on Google
I had my taxes done at Mackisen Consultation Inc., and I couldn’t be more satisfied. The technicians were not only highly skilled but also took the time to explain every detail.
Houman Gholipour
Review on Google
I do my taxes for me and also all members of our family with Mackisen since more than 25 years. They are very reliable and very patient and quick to support and react.
Joey D
Review on Google
I've been going to Mackisen for over 20 years to do my taxes and for other financial advice. I couldn't be happier with their service, making finance easy to understand.
Our Core Audit & Assurance Services
Financial Statement Audit (IFRS/ASPE)
The gold standard in financial reliability. We conduct independent audits that verify every figure in your financial statements, producing an auditor’s report with full assurance and credibility. Audited financials earn immediate trust from banks, investors, and regulators—enabling smoother financing, mergers, and growth.
Review Engagement (Mission d’examen)
When a full audit isn’t required, a review provides professional credibility at a lower cost. Through analysis and inquiry, we ensure your statements are plausible and accurate, giving lenders moderate assurance and improving borrowing potential.
Compilation (Notice to Reader / Mission de compilation)
Ideal for small businesses seeking clarity and organization. We compile your financial information into professional CPA statements that strengthen loan applications and internal decision-making—even without an audit opinion.
Special Purpose and Compliance Audits
For grants, government funding, or lender covenants, we perform targeted compliance audits. Our reports help you meet the requirements of regulators, boards, and funding agencies with confidence.
Internal Controls and Risk Advisory
Protect assets and reputation with a control audit that identifies weaknesses before they become problems. We review accounting systems, fraud prevention, and IT safeguards to enhance reliability and boost lender confidence.
IFRS/ASPE Conversion and Advisory
Transitioning from ASPE to IFRS or preparing for an IPO, merger, or acquisition? We manage the conversion—from policies to restatements—ensuring compliance and clarity for global investors and partners.
The Mackisen Advantage
Financial statements accepted by major banks and investors
Faster loan and financing approvals
Lower borrowing costs through verified transparency
Stronger confidence from investors and boards
Full compliance with IFRS, ASPE, and Quebec CPA standards
Comprehensive review of internal controls and fraud prevention
All our services
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