Stop stitching together a bookkeeper here, a payroll app there, and invoicing whenever you find time. ATS runs your entire back office — bookkeeping, accounts payable and receivable, payroll coordination, and monthly reporting — as one CPA-led department, so your books are always current and you get your evenings back.
What does an outsourced back office do? It runs your company’s day-to-day finance function for you — recording every transaction, paying suppliers, invoicing and chasing customers, coordinating payroll, tracking sales tax, closing the month, and delivering reports you can actually use. ATS provides that whole department as a service: a licensed CPA firm in Montréal, bilingual, serving businesses across Canada, so you get finance-department output without the finance-department payroll.
Most small and mid-sized businesses don’t need a full in-house finance team — but they do need everything a finance team does. ATS closes that gap. We become your virtual bookkeeping and accounting department: the same people, every month, handling the full cycle from source documents to management reports, all reconciled and connected. You get one accountable partner instead of a bookkeeper, a payroll service, and a spreadsheet that never quite agree.
If finance work keeps landing on someone who shouldn’t be doing it, a back office fits.
The full finance function — not just data entry.
This page is general information, not accounting or tax advice for your specific situation. Scope is tailored to your business — book a free consultation to design the right back-office setup.
Onboard once, then a steady monthly rhythm.
We map what your finance function needs today and where the gaps and risks are.
We connect your accounts, set up or clean up QuickBooks/Xero, and define approvals, workflows, and your reporting package.
We handle bookkeeping, AP, AR, payroll coordination, and sales tax throughout the month, with a dedicated point of contact.
We close the month and deliver reconciled financials and the metrics you use to run the business.
A back office only works if the numbers can be trusted — which is why it belongs with accountants, not just data-entry help. ATS is a licensed CPA firm, a member of the Ordre des CPA du Québec, with US and Canadian CPAs on staff, over a decade of experience, and QuickBooks Certified ProAdvisor and Xero Partner credentials. Bilingual and Montréal-based, we serve businesses across Canada, and because a CPA firm stands behind the work, your year-end is already clean.
Your back office connects to everything else we do: monthly bookkeeping, AP/AR management, payroll, tax, and cloud accounting. Préférez le français ? Voir comptabilité externalisée.
