Accounting Services in Montréal
Bilingual & Canada-Wide

Our Montréal Accounting Services

One bilingual partner for every financial operation your business needs.

Bilingual & Quebec-Native by Design

We work in English and French and are fully fluent in Quebec's requirements: QST alongside GST/HST, Revenu Québec filings, RL slips, and QPP/QPIP payroll. Prefer to work in French? Visit our page de comptabilité en français. Whether you're a Montréal restaurant, a Quebec non-profit, or a growing company with employees in several provinces, you get one team that understands both worlds.

QuickBooks & Xero Experts — AI-Automated Bookkeeping

ATS is a QuickBooks Certified ProAdvisor and a Xero Partner. We set up, clean up, integrate and run your books on the platforms you already use — and we layer in AI-powered automation to categorise transactions, chase receipts and flag issues faster, so your numbers stay current and accurate.

A CPA-led team, serving Canadian businesses for over a decade. Our team includes Canadian CPAs (Ordre des CPA du Québec / CPA Canada) and US CPAs on staff — so we also handle cross-border US–Canada tax. We grew from bookkeeping and payroll roots into full-service accounting.

Your data, protected. Accounting means handling sensitive financial information. We use bank-grade encrypted cloud platforms, restrict access on a need-to-know basis, and keep every client engagement strictly confidential. Learn more about how we work →

Works With Your Accounting Software

We connect directly to the major Canadian cloud accounting platforms — or help you migrate to the right one.

Who We Help

Small businesses and organisations that want reliable, bilingual financial operations.

Quebec & Montréal Compliance, Handled

Doing business in Quebec means two tax authorities, not one. ATS manages the full Quebec picture alongside your federal obligations, so nothing falls between the cracks:

• GST/HST and QST — registration, tracking and remittances for both the federal GST/HST and Quebec’s provincial QST.
• Revenu Québec — business tax accounts, instalments and filings, in addition to your CRA returns.
• RL-1 and RL slips — Quebec’s employee slips issued alongside federal T4s at year-end.
• QPP & QPIP payroll — Quebec Pension Plan and Quebec Parental Insurance Plan deductions, which replace CPP and EI for Quebec employees.
• CNESST & provincial remittances — we keep your payroll aligned with Quebec’s workplace and remittance requirements.
• French-language service & Law 25 — we work in French when you need it and handle your financial data in line with Quebec’s privacy legislation.

National, English-only firms often outsource or skip the Quebec side. Because we are Montréal-based and bilingual, it is simply part of how we work.

Canada-Wide, Remote by Design

A Montréal head office does not mean Montréal-only clients. Our bookkeeping runs on secure cloud platforms with AI-assisted workflows, so we support businesses in every province without an in-person visit — and we adjust for each jurisdiction’s rules:

• Federal filings with the CRA for corporations and small businesses anywhere in Canada.
• Sales tax by province — HST in Ontario and the Atlantic provinces; GST plus a provincial sales tax (PST/RST) in British Columbia, Manitoba and Saskatchewan; and GST-only in Alberta.
• Provincial payroll & workers’ compensation — from WSIB in Ontario to WorkSafeBC and the provincial WCBs.
• One team, many provinces — ideal for employers with staff spread across the country who want a single, consistent point of contact.

Cross-Border US–Canada Tax

With US CPAs on staff alongside our Canadian CPAs, ATS handles situations most local firms refer out: US citizens and green-card holders living in Canada, Canadians earning US income, companies operating on both sides of the border, and non-resident filings. That dual-jurisdiction, bilingual capability is rare among Montréal firms of our size. If cross-border tax is part of your picture, tell us about your situation and we’ll map the right approach.