Coexist by design

Connect the tools your accountant already uses.

FastAccounts can exchange data through tested provider adapters while making direction, ownership, review, and conflicts visible. No provider below is connected by default, and tax submission remains gated.

3 accounting adapters2 filing gatesRead-only banking candidate
UK

QuickBooks Online

Accounting platform

Coexist with an existing QuickBooks company through reviewed imports and controlled exports.

ContactsInvoices and billsPaymentsAccounts and taxAttachments
DirectionImport first · export by policy
Record ownershipConfigured per object
Read provider documentation ↗
UK · EE

Xero

Accounting platform

Exchange accounting data with a Xero organisation using tenant-scoped OAuth and explicit conflict review.

ContactsInvoices and credit notesPaymentsBank transactionsReports
DirectionImport first · export by policy
Record ownershipConfigured per object
Read provider documentation ↗
EE

Merit Aktiva

Accounting platform

Support Estonian accountant workflows with HMAC-signed V2 invoice, payment, tax, GL and report exchange.

Sales and purchase invoicesPaymentsTax IDsGL transactionsDimensions
DirectionImport and export · reviewed
Record ownershipConfigured per object
Read provider documentation ↗
UK

HMRC Making Tax Digital

Filing agent

Prepare accountant-reviewed VAT workpapers now; add sandbox obligations and submission flows before production approval.

VAT obligationsNine-box workpaperReview declarationSubmission receipt plan
DirectionFastAccounts to HMRC
Record ownershipAccountant-approved filing
Read provider documentation ↗
EE

Estonian Tax and Customs Board

Filing agent

Generate accountant-reviewed KMD and VD workpapers and retain a stub for a future supported filing channel.

KMD workpaperVD preparationAudit exportDirect filing discovery
DirectionFastAccounts to accountant
Record ownershipAccountant-reviewed export
Read provider documentation ↗
UK · EE

Open banking

Bank data

Read booked transactions through a selected AISP after GB/EE business-bank coverage and legal review.

Consent lifecycleAccounts and balancesBooked transactionsReconciliation input
DirectionRead-only first
Record ownershipBank remains source
Read provider documentation ↗
Review gate: Imports and exports produce reconciliation records. Direct tax submission stays disabled until provider approval, accountant UAT, and explicit finalisation controls are complete.