Illustrative previewA per-tenant AL extension that determines sales tax, VAT and GST in real time from Avalara AvaTax during Business Central document posting — built, installed and supported by ECOSIRE.
Key Features
Real-time AvaTax rate determination on sales and purchase posting via AL event subscribers on the posting codeunits
CreateTransaction payload built from document lines, item tax codes and ship-from/ship-to addresses, written back as line-level tax before GL posting
Address validation against Avalara's address API on customer and vendor cards, with one-click correction
Exemption certificate / entity-use code handling mapped to BC customers and document lines
Multi-jurisdiction nexus and registration mapping covering US/Canada sales & use tax, EU/UK VAT and GST across 75+ countries
Commit / void / credit synchronization so posted, voided and credit-memo documents stay reconciled in AvaTax
Return-file data export feeding Avalara Returns or your filing process from posted VAT/tax entries
AvaTax setup page with account ID, license key and company code stored in BC isolated storage
Job queue entry for resilient calls — automatic retry, timeout handling and graceful fallback to BC native tax
Dedicated permission set scoping tax setup, posting and reconciliation roles
Per-tenant extension install (no source lock-in) recompiled and revalidated against each BC major release
Sandbox-first cutover with reconciliation reports comparing AvaTax output against BC native VAT/tax posting
Built to order, done for you
No DIY setup — a working app, built, installed and supported by ECOSIRE.
- 1
You order
Start with a one-time build price. We scope it with you at kickoff.
- 2
We build & install
ECOSIRE builds, configures and installs it on your Dynamics 365 Business Central.
- 3
Go live + support
You go live in about 2–4 weeks, with a post-launch support window.
About this Product
This is a build-to-order Business Central extension, not an instant AppSource download. ECOSIRE builds it in AL, installs it as a per-tenant extension on your Business Central environment (SaaS Online or on-prem), and supports it after go-live.
The connector wires Avalara's AvaTax determination engine directly into the BC posting pipeline. Using AL event subscribers on the sales and purchase posting codeunits (OnBeforePostSalesDoc, OnAfterReleaseSalesDoc and related publishers), it intercepts documents before they post, builds an AvaTax CreateTransaction payload from the document lines, ship-from/ship-to addresses and tax codes, and writes the returned line-level tax back onto the document — so the GL, customer ledger and VAT entries reflect Avalara's real-time rate determination across 75+ countries (US/Canada sales & use tax, EU/UK VAT, GST and more).
We add table and page extensions for AvaTax tax codes, entity-use (exemption) codes and nexus/registration mapping, a setup page holding the AvaTax account ID, license key and company code (license stored via BC's isolated storage), and a permission set scoping who can post and reconcile tax. Address validation runs against Avalara's address API on customer/vendor cards. Calls are made through BC's HTTP client to the AvaTax REST endpoint, with a job queue entry for retry, batch commit (commit/void on posting and credit) and return-file data export.
Because it is your own per-tenant extension, the source is yours, it survives BC major upgrades (we recompile against each release), and there is no shared multi-tenant black box. You bring the Avalara account; we deliver the certified-pattern integration, deploy it, and validate it against real posting scenarios in a sandbox before production cutover.
What you get
- Per-tenant AL extension (.app) installed on your Business Central sandbox and production environments
- Full AL source code, transferred to your repository — you own it
- AvaTax setup page, table/page extensions and permission set configured to your jurisdictions
- Job queue setup for retry/batch processing and scheduled return-file export
- Sandbox validation run with a reconciliation report (AvaTax vs BC native tax) signed off before cutover
- Deployment runbook, configuration guide and post-go-live support window
Who this is for
Finance / Tax Manager
Owns multi-jurisdiction VAT, GST and US sales & use tax accuracy and wants determination to happen automatically at posting instead of via spreadsheets and manual rate lookups.
Business Central Administrator
Needs the integration installed as a clean per-tenant extension with proper permission sets and job queue setup, and that survives BC's twice-yearly major upgrades.
Controller / CFO at a cross-border seller
Sells into the US, EU, UK and beyond and needs audit-ready, jurisdiction-correct tax on every invoice plus clean return-file data for Avalara Returns.
How Avalara-Certified Sales Tax & VAT Engine Connector for Business Central Compares
| Criterion | ECOSIRE | Custom Build | Competitor | Odoo Native |
|---|---|---|---|---|
| Real-time AvaTax determination inside BC document posting | Included | Partial support | Included | |
| Address validation against Avalara's address API | Included | Partial support | Included | |
| Exemption certificate / entity-use code handling | Included | Partial support | Included | |
| Multi-jurisdiction nexus across 75+ countries | Included | Partial support | Included | |
| Return-file data export for Avalara Returns | Included | Partial support | Included | |
| Full AL source code ownership, no vendor lock-in | Included | Included | Not included | |
| Built, installed and supported for you on your environment | Included | Not included | Partial support | |
| Tailored to your jurisdictions and tax-code mapping | Included | Included | Partial support |
Frequently Asked Questions about Avalara-Certified Sales Tax & VAT Engine Connector for Business Central
Is this an instant AppSource download?
No. This is a build-to-order extension. ECOSIRE builds it in AL to fit your jurisdictions and tax-code mapping, then installs it as a per-tenant extension on your Business Central environment. You receive the full source code.
What is the delivery lead time?
Typical delivery is around 2 to 4 weeks depending on the number of jurisdictions, your exemption-certificate rules and how many document types need coverage. We start in a sandbox, validate against real posting scenarios, and only then cut over to production.
How does ongoing support and updates work?
Business Central ships major releases twice a year. We recompile and revalidate the extension against each release so it keeps working, and provide a post-go-live support window for fixes and configuration changes. Extended support and enhancement retainers are available.
Do I need my own Avalara AvaTax account?
Yes. You provide the AvaTax account ID, license key and company code from your own Avalara subscription. We securely store the credentials in BC isolated storage and wire the determination, commit/void and address-validation calls through to your account.
Will it work on Business Central SaaS (cloud) and on-premises?
Yes. The extension uses supported AL patterns — event subscribers, the HTTP client and the job queue — so it installs as a per-tenant extension on BC Online (SaaS) and on supported on-premises versions. We confirm your version and environment during scoping.
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Avalara-Certified Sales Tax & VAT Engine Connector for Business Central
A per-tenant AL extension that determines sales tax, VAT and GST in real time from Avalara AvaTax during Business Central document posting — built, installed and supported by ECOSIRE.
- Real-time AvaTax rate determination on sales and purchase posting via AL event subscribers on the posting codeunits
- CreateTransaction payload built from document lines, item tax codes and ship-from/ship-to addresses, written back as line-level tax before GL posting
- Address validation against Avalara's address API on customer and vendor cards, with one-click correction
- Exemption certificate / entity-use code handling mapped to BC customers and document lines