Accounting AI agent · E-invoicing
Statutory E-Invoicing & E-Reporting Compliance AI Agent
Map each invoice to the format the destination mandates, transmit it through the required channel, act on clearance responses, and assemble e-reporting submissions, with filing sign-off and tax position staying with an authorised person.
- Typical delivery
- 4–6 weeks
- Deployment
- Your stack
- Filing sign-off
- Pre-clearance
- After launch
- Agent Care
What this agent does
Maps and transmits — not the tax call
In
- 01
The invoice record and its destination jurisdiction are pulled from supported billing, ERP or e-invoicing sources.
- 02
The schema each field must match is normalised from the source record, with the original value carried forward.
Reason
- 03
The mandated format — the jurisdiction's schema, structure and required fields — is mapped from the invoice record.
- 04
The jurisdiction's configured channel and clearance rules decide where and how the transmission is sent.
- 05
Every mapped field is bound to a source value, and what the mandate leaves ambiguous is marked.
Decide
- 06
Clearance rejections, schema mismatches and threshold changes are flagged against the configured jurisdiction.
- 07
Every rejection and flagged transmission is routed to the named tax lead for review.
Out
- 08
The invoice, the schema it targeted, the transmission result and any correction are retained against the record.
- 09
Execute write actions only inside the approval boundaries agreed during implementation.
Product statement
The agent maps and transmits the invoice; the tax lead decides on any rejection, and the business stays the filer of record.
Example workflow
One invoice, issuance to filing
- 1Invoice generatedERP invoice run, billing system, POS export or invoicing API
- 2Mandate context assembledCounterparty jurisdiction, transaction type, prior filings and the configured mandate rules
- 3Invoice mapped to formatSchema, channel, flags and confidence
- 4Controls appliedSchema validation, duplicate checks, mandate-rule checks and confidence threshold
No human action required
Stages 1 to 4 run unaided, and nothing transmits at any of them — the agent is mapping and validating, and the tax lead's lane opens at the confidence gate.
Goes to the tax lead to approve.
Adds a compliance read first.
Filing sign-off
The transmission is held with its mapped schema, its flagged fields and the confidence.
Approve · Correct · Escalate to counsel
Approved — released to transmit
- 6ERP and filing records updatedOnly where write access and approval policy allow it
- 7Outcome evaluatedClearance outcome, correction turnaround, rejection cause and filing accuracy
Corrections
Every tax-lead correction is counted in the evaluation.
What should not run autonomously
Human approval stays in control
Outside the boundary — human approval required
8 items
- Deciding a transaction's taxability or VAT rate.
- Filing the VAT return or any indirect-tax filing.
- Choosing a jurisdiction's tax treatment or position.
- Altering an invoice's commercial terms or pricing.
Automation boundary
Agent acts unaided
- ✓Map each invoice to the format its destination mandates.
- ✓Transmit it through the currently registered, configured channel.
- ✓Apply the jurisdiction's validation or post-audit rules.
- ✓Flag rejections and threshold changes for the named tax lead.
Any transmission happens inside the boundaries agreed at implementation, never ahead of approval.
- Treating a clearance rejection as resolved unseen.
- Selecting which certified platform an invoice uses.
- Backdating an invoice's statutory issue date.
- Deciding the e-reporting scope for a jurisdiction.
Example output
One invoice, annotated
Everything the agent transmits is attached to the mandate it was mapped against.
Transmission output · single invoice
Illustrative example- Invoice
- Italian clearance invoice
- Mapped output
- Corrected and resent to SdI within the statutory cure window
- Invoice total
- €4,250.00
- Mandate source
- Italy clearance mandate
- Confidence
- 91%
- Clearance status
- SdI receipt ID re-issued
As received
Taken from the invoice record and the SdI response — nothing on this side is inferred by the agent.
Source facts used
- SdI rejection code
- Configured mandate rules
- Platform receipt log
Why this status
A scartata response means the invoice never legally existed and a person still decides.
What the score decides
Below the configured threshold the transmission picks up a compliance read before it.
Action
ApproveCorrectEscalate to counselValue
Where AI adds value
The same four claims, placed at the point in the workflow where each one applies.
Where the value lands
Value 01 – 04
Every invoice
From the invoice record
Map from the record
Draw on the invoice record and the jurisdiction's configured format and channel rules.
Rejected means never issued
A clearance rejection is caught and routed the moment the platform returns it, not at month-end.
Send review to the failed sends
Rejections and low-confidence mappings are marked, so the tax lead's read starts where mandate risk concentrates.
Build an evidence trail
The invoice, the schema it cleared against and the clock the authority stamped stay on the record.
Integrations
Typical integrations
Five system groups connect to the same agent. Which of them are in scope is decided in discovery.
ERP and billing systems
- SAP
- Oracle
- NetSuite
- Zuora
- Chargebee
- custom ERP
National clearance platforms
- SdI
- KSeF
- ZATCA Fatoora
- PDP/PPF
- IRP
- MyInvois
Archiving and audit
- Compliant e-archive stores
- Tax-authority audit trails
Agent
E-invoicing compliance
- Reads the invoice
- Maps and transmits
- Holds for sign-off
Tax and filing systems
- VAT/GST return systems
- E-reporting submission tools
Observability & evaluation
- OpenTelemetry
- Langfuse
- Supported monitoring/evaluation sources
Integration availability depends on the client's existing systems and API access.
Agent controls
Six layers between the model and the mandate
Controls nest inward. What the stack misses is set out in the map beneath it.
L6 · Outermost — last line of defence
Inward → L1 · closest to the model
- L1 – L2
- Test whether a transmission may stand
- L3
- Puts the release in the tax lead's hands
- L4 – L5
- Keep the invoice and the clearance behind it
- L6
- Reverts to queue-and-alert when the channel degrades
How Nestack evaluates it
Evaluate the transmission workflow — not only the mapped schema.
Coverage runs the whole depth of the workflow, and every layer is cut by slice.
Surface — the filing the authority sees
- E1Final-output evaluationDid the mapped schema clear the destination platform's validation?
- E2Step-level evaluationDid the agent use the right jurisdiction, format and channel configuration?
- E3Tool evaluationDid it read and write the correct invoice and the correct clearance response?
- E4Confidence calibrationDo low-confidence mappings actually attract more clearance rejections?
- E5Slice evaluationHow does performance change across specific mandate types?
- E6Business outcomeHow many transmissions needed a correction or resend after rejection?
Floor — the outcome the filing entity answers for
Failure modes
Where each failure originates in the agent
Seven failure modes, placed at the stage each one originates.
Agent lifecycle
Direction of processing →
01 · Retrieval
1 mode
- EI-03
Stale registration source
A platform or PDP's registration status is read from a cached list, not the live registry.
Stage gathers
Invoice record, counterparty jurisdiction
02 · Reasoning
2 modes
- EI-04
KSeF legal-date error
Invoice is dated to the seller's ERP stamp, not the platform's receipt time.
- EI-06
Threshold misapplied
A phase-in tier or exemption is applied before the counterparty's effective date.
Stage proposes
Schema, channel and confidence
03 · Tool / write
2 modes
- EI-02
Resend abandoned after outage
Transmission is not retried once the platform returns, missing the mandatory window.
- EI-05
Obligation conflated
E-reporting data is submitted in place of the separate e-invoicing obligation.
Stage writes
Only where write access and approval policy allow it
04 · Output
1 mode
- EI-01
Rejection read as accepted
A submission acknowledgement is treated as clearance, not the platform's later validation.
Stage returns
The status the indirect-tax lead approves
05 · Change / Version
1 mode
- EI-07
Silent mandate regression
A schema or channel update changes what the agent will map without notice.
Stage tracks
Model, prompt, schema and channel rules
- Sev-1 · transmits outside the boundary
- Sev-2 · a wrong filing reaches the authority
- Sev-3 · source degrades, routes to review
Affected slices
One mandate carries the rejection rate
A national pass rate can look acceptable while one mandate cohort — a new country, a reverse-charge flow, a correction — absorbs most of the rejections. Nestack reports the rejection rate by slice, not only in total.
Slice performance — reported separately, not only in aggregate
Illustrative example| Slice | Failure rate | Lift | Lift vs. threshold | Status |
|---|---|---|---|---|
| First invoices under a new mandate | 7.4% | 3.9× | Review | |
| Cross-border B2B with reverse charge | 5.2% | 2.7× | Review | |
| Credit notes and corrections | 3.1% | 1.6× | Watch | |
| Domestic B2B, steady state | 1.9% | 0.7× | Normal |
Bar: rejection-rate lift vs. the domestic steady-state baseline · scale 0–4.0× · tick at 2.0×
2 of 4 slices over threshold
Evidence-linked improvement
Every cycle ends with a new regression case
A cycle closes when the rejection is a case the next release has to clear. That suite is what the next invoice transmitted is measured against.
Improvement cycle · five stages
Switchback — the path turns at Improve and returns at Learn
- 01
Detect
Rejection rate rises in a mandate slice.
- 02
Diagnose
The transmission the platform refused is read back against its schema and the jurisdiction's rule until the cause narrows to one.
- 03
Improve
The correction is versioned, with the invoices that motivated it attached.
- 04
Verify
A failing schema case holds the release until it passes.
- 05
Learn
The case is added permanently, and the jurisdiction rules move with it.
Learn → Detect
The return edge. Detection next time runs against a suite one rejection longer.
Typical build scope
Twelve workstreams across six weeks
The build scope read against the delivery timeline. Week structure follows the six-week plan — discovery, sources, mapping workflow, evaluation, integration, then production validation and handover.
Workstream
Week 1Week 2Week 3Week 4Week 5Week 6
- 01E-invoicing workflow discovery and boundary mapping.Week 1
- 02ERP, billing and registry assessment.Week 1, Week 2
- 03Jurisdiction, format, channel and clearance-rule mapping.Week 1, Week 2
- 04Invoice ingestion and field normalisation.Week 2
- 05Mandate retrieval and mapping logic.Week 2, Week 3
- 06Confidence scoring and rejection routing.Week 3
- 07Filing sign-off workflow.Week 3, Week 4
- 08Billing-system and platform integration.Week 5
- 09Schema and clearance cases.Week 4, Week 5
- 10Guardrails and transmission controls.Week 4
- 11Invoice-trail instrumentation.Week 5, Week 6
- 12Deployment, documentation and Agent Care handover.Week 6
12 workstreams · 6 weeks · bar shows the weeks a workstream is active — several run in parallel
Final scope and sequence confirmed in discovery
Engagement tiers
What each tier includes
Rows are the capabilities named in each tier's scope. Higher tiers include everything below them.
| Capability✓ in scope · — not at this tier | PilotOne jurisdiction, one entity | ProductionProduction billing systems | AdvancedMultiple countries / entities |
|---|---|---|---|
| Introduced at Pilot | |||
| Mapping to your mandate rules | ✓ | ✓ | ✓ |
| Filing sign-off | ✓ | ✓ | ✓ |
| Clearance-rate baseline | ✓ | ✓ | ✓ |
| Introduced at Production | |||
| Reporting by jurisdiction | — | ✓ | ✓ |
| Sign-off workflow in your systems | — | ✓ | ✓ |
| Approved transmission | — | ✓ | ✓ |
| Billing-system integration | — | ✓ | ✓ |
| Introduced at Advanced | |||
| Multi-jurisdiction mandate rules | — | — | ✓ |
| Multi-stage filing sign-off | — | — | ✓ |
| High invoice volume | — | — | ✓ |
| Multi-country mandate controls | — | — | ✓ |
| Build price | From $5,000 | From $8,000 | Custom quote |
- Final build price
- Confirmed after discovery based on integrations, workflow complexity, transaction volume, approval controls and deployment requirements.
- Separate from build
- Build pricing is separate from recurring Agent Care, which covers managed monitoring, evaluations, incidents and verified improvements after launch.
What we need from you
What you bring, and what we build with it
Each input maps to a piece of build scope and a week in the delivery timeline.
You bring
We build with it
01Your invoice fields and ERP record structure
→Invoice ingestion and mandate-field mapping
Week 102Representative invoices across your markets
→Mapping baseline, schema extraction and field binding
Week 203Your jurisdiction list and mandate configuration
→Jurisdiction, format and channel-rule mapping
Week 104Access to relevant APIs, feeds or exports
→ERP, billing and platform-registry assessment, then integration setup
Week 205Invoices you would not want transmitted
→Rejection cases and the evaluation suite
Week 406What no invoice may leave without
→Confidence scoring, rejection routing, guardrails and sign-off controls
Week 307Named tax leads to sign off transmissions
→Filing sign-off workflow, then pilot and production validation
Weeks 5–6
Nothing else is required
Deployment, documentation and Agent Care handover are ours.
Delivery timeline
Four phases across six weeks
Weeks are drawn where the work sits, so the fifth carries both evaluation and the first live transmissions.
Phase
W1
W2
W3
W4
W5
W6
- DiscoveryW1
- BuildW2 – W3
- EvaluateW4 – W5
- Pilot & LaunchW5 – W6
Week focus
W1E-invoicing discovery, mandate mapping and the automation boundary
W2Source integration and the mapping baseline
W3Mapping workflow, confidence logic and sign-off controls
W4Evaluation suite, schema checks and failure-mode testing
W5Platform integration, pilot transmissions and targeted corrections
W6One filing period transmitted under the indirect-tax lead, then handover
- Reading the band
- A bar covers only the weeks its work is named in. The week 5 overlap is real, not padding.
- At the end of W6
- Validation closes on live transmissions, and Agent Care takes over monitoring.
- Duration
- Six-week plan shown · typical delivery 4–6 weeks depending on scope confirmed in discovery.
Next step · Accounting AI agent
Build an e-invoicing agent around each mandate's format and channel.
Show us your invoicing systems, your mandate countries and who owns filing sign-off. What does each jurisdiction actually require? We map the format, the channel and the sign-off chain before anything transmits.
- Typical delivery
- 4–6 weeks
- Deployment
- Your ERP stack
- Filing sign-off
- Pre-clearance
- After launch
- Agent Care available
Nestack Agents · E-invoicing compliance
AGT-ACC-17 · Agent Care available after launch