ATS is a licensed CPA firm based in Montréal, serving businesses across Canada. We pair experienced Canadian and US CPAs with modern, AI-automated bookkeeping to deliver accounting you can build a business on — bilingual, cross-border, and dependable.
ATS started where most businesses feel the pain first — bookkeeping and payroll — and grew, over more than a decade, into a full-service accounting firm. Today we handle the whole financial operation for our clients: bookkeeping, payroll, sales tax, corporate and personal tax, cross-border US–Canada work, and advisory, all under one licensed CPA roof.
We’re based in Montréal and work bilingually in English and French, with clients across every Canadian province. Because we run on cloud accounting and AI-automated document capture, distance is irrelevant — your books are live, your reports are on time, and your accountant is a message away wherever you are.
What hasn’t changed since day one is the standard: accurate books, filed on time, explained in plain language, and backed by professional accountability.
Presented as a firm — verifiable, collective, and real.
The principles behind every engagement.
Owner-managed businesses and organizations across Canada.
We present ATS by its credentials rather than by individual profiles. Our licence, certifications, and experience are collective and verifiable — a licensed CPA firm with Canadian and US CPAs, QuickBooks ProAdvisor and Xero Partner status, and over a decade of experience. You always know the qualifications standing behind your books; we simply keep the focus on the work and respect our team’s privacy.
Explore what we do: accounting services in Montréal, bookkeeping, tax, and cross-border tax. Préférez le français ? Voir À propos d’ATS.
