QuickBooks closes your month, then you reconcile QST by hand because it wasn't built for Quebec
Custom accounting software in Montreal runs $60k to $150k over 5 to 8 months. QuickBooks, Xero, and FreshBooks handle GST/HST and general bookkeeping, but Quebec's QST, French-default invoices, and the dual-currency reality of Montreal aerospace and pharma trade push you into manual reconciliation and side spreadsheets the packaged tools weren't built to avoid.
The mainstream accounting tools treat Quebec as a tax-rate add-on. QST alongside GST, the specific filing forms, French-default invoices a Quebec customer is entitled to, and the CAD/USD costing of cross-border aerospace and pharma deals all end up partly manual. Your books close, but QST reconciliation and bilingual invoicing live in spreadsheets beside the system.
For a Montreal company with project-based revenue, an aerospace supplier, a research-services firm, the gap widens: you need project costing, multi-currency, French invoices, and Quebec-correct tax in one ledger, and the packaged products make you choose which lives outside the system.
Where the off-the-shelf tools fall short
- QST reconciliation lands in spreadsheets beside QuickBooks or Xero
- Invoices don't default to French for Quebec customers
- CAD/USD dual-currency costing on cross-border deals is partly manual
- Project-based aerospace and pharma costing doesn't fit the packaged ledger
Custom accounting: what Montreal teams actually get
You build when Quebec tax, French invoicing, multi-currency, and project costing all have to live in one ledger instead of spreadsheets beside it. Custom accounting software models QST and GST correctly, defaults invoices to French, and handles CAD/USD project costing natively. For a Montreal firm carrying all four needs, that single coherent ledger replaces the manual reconciliation the mainstream tools force.
Feature priorities for Montreal teams
What we build under accounting in Montreal
Digital Heroes builds the full accounting stack for Montreal teams. Typical engagements cover Xero integration, invoicing software, bookkeeping software, financial reporting, accounts payable automation and accounts receivable.
- QST and bilingual invoicing keep landing in spreadsheets
- You need multi-currency and project costing in one ledger
- French-default invoices are a real customer and compliance requirement
- The packaged tool forces parts of accounting outside the system
- Standard bookkeeping with a QST add-on covers you
- You don't run multi-currency or project costing
- An accountant manages QST reconciliation comfortably
- You prefer vendor-managed tax updates
The honest cost picture for Montreal
| Project scope | Typical cost | Timeline |
|---|---|---|
| QST and bilingual-invoice layer over existing accounting | $50k to $85k | 4 to 6 months |
| Custom accounting with multi-currency and project costing | $100k to $150k | 6 to 8 months |
| Project-costing and tax module integrated with your ERP | $70k to $115k | 5 to 7 months |
Timeline: what happens, and when
Exactly what you get
Accounting software that handles QST and GST correctly in one ledger so your month-end doesn't spill into QST spreadsheets, issues invoices that default to French for Quebec customers, and carries CAD/USD multi-currency and project costing natively for your aerospace and research work. It includes audit trails and approval workflows for proper controls, and integrates with your ERP, CRM, and inventory management so finance and operations share one set of numbers.
How to choose a developer in Montreal
Pick a team that can speak to QST filing forms and CAD/USD rounding precisely, because accounting accuracy is unforgiving and Quebec tax is where the mainstream tools cut corners. Ask how invoices default to French, how multi-currency stays consistent, and how they test for accounting accuracy. A strong Montreal partner has built Quebec-correct, bilingual, multi-currency accounting and treats QST and audit rigor as the heart of the system.
- QST and GST handled correctly in one ledger, no spreadsheet reconciliation
- Invoices that default to French for Quebec customers
- Native CAD/USD multi-currency for cross-border aerospace and pharma trade
- Project costing for project-based revenue in the same system
- Integration with your ERP, CRM, and inventory management
- You own tax-table and filing-form updates the vendors ship automatically
- Custom accounting carries audit and accuracy risk that demands rigorous testing
- Build timelines exceed configuring QuickBooks or Xero
- Standard small-business bookkeeping is genuinely well served by the packaged tools
- !They treat QST as a rate, ask how filing forms and reconciliation are handled
- !Invoices stay English, ask how French-default invoicing works
- !No multi-currency rigor, ask how CAD/USD rounding stays consistent
- !They underestimate accounting risk, ask how they test for accuracy
- !No ERP integration, ask how accounting and operations data align
Most Montreal teams pricing accounting end up comparing notes on warehouse management, field service management, erp too; the systems share one data spine.
Rohan advises mid-market and enterprise teams on ERP, CRM and custom software, and has led delivery on dozens of business-software builds.
Writes for Digital Heroes, shipping business software for 2,000+ brands across 55+ countries since 2017.
Frequently asked questions
Can't QuickBooks or Xero handle Quebec tax?
They handle GST/HST and offer a QST rate, but the filing forms, reconciliation, and French-default invoicing usually spill into spreadsheets beside the system. Custom accounting keeps QST, GST, multi-currency, and French invoices in one ledger.
What does Quebec-aware accounting software cost in Montreal?
A QST and bilingual-invoice layer over your existing tool runs $50k to $85k. A full custom system with multi-currency and project costing runs $100k to $150k over six to eight months.
Do invoices need to be in French in Quebec?
Yes, Quebec customers are entitled to French invoices, so a custom system should default invoices and statements to French, with English available when appropriate.
Why is custom accounting riskier than other builds?
Accounting accuracy is unforgiving, so a custom ledger demands rigorous testing and audit trails. The trade-off is real, which is why many firms extend their existing tool rather than replace it.