CSV Tools for Accountants and Bookkeepers
Fiscal codes, IBANs, VAT numbers, and invoice sequences that fail a filing rarely fail loudly, they fail quietly until a submission is rejected. These tools catch the structural problems in bulk, before that happens, entirely in your browser, so client registries and invoice data never leave your device.
Bottom line: HowToCSV's accountant tools validate Codice Fiscale, Partita IVA, IBAN, EU VAT, GSTIN, and invoice sequences in bulk, entirely client-side, catching structural errors before a tax authority rejects the filing.
Fiscal Compliance Tools
Accountant Tools
Bulk-validate Codice Fiscale, Partita IVA, IBAN and dates, and compute IVA on invoices.
FatturaPA Validator
Check Italian e-invoices for mandatory fields, checksums, and IVA math before SDI submission.
EU VAT Compliance
Bulk-validate EU VAT numbers and flag when distance sales cross the €10,000 OSS/IOSS threshold.
US/CA Sales Tax Auditor
Flag post-Wayfair economic nexus threshold breaches and audit Canadian GST/HST/PST rates.
India GST Compliance
Validate GSTIN checksums, CGST/SGST/IGST logic, and the ₹5 crore e-invoice mandate.
Invoice Sequence Auditor
Detect gaps and duplicates in invoice numbering before a fiscal year close.
A Suggested Workflow
Run Accountant Tools first to validate client identifiers (Codice Fiscale, Partita IVA, IBAN) and compute IVA across a batch of invoices. If your business operates internationally, layer in EU VAT Compliance, US/CA Sales Tax Auditor, or India GST Compliance depending on where your customers are. Before a fiscal year closes, run Invoice Sequence Auditor across the full year's invoice numbers to catch gaps or duplicates while there's still time to explain them, rather than during an audit.
For Italian e-invoicing specifically, FatturaPA Validator catches the structural issues (missing Natura codes, IVA math mismatches) that cause SDI to reject a submission, before you submit, not after.
Supporting Tools
For custom validation rules or a broader data-quality pass on any client export:
Frequently Asked Questions
Does client data ever leave the browser?
No, every check runs client-side. Client registries, payroll exports, and invoice data are never uploaded anywhere.
Does passing these checks guarantee a filing will be accepted?
No, these are structural pre-checks confirming the data is internally consistent and correctly formatted, not a guarantee of acceptance by SDI, GSTN, VIES, or a tax authority. Always confirm against the official system before filing.
Have a client export to validate?
Run it through HowToCSV without ever uploading it to a server.
Open Accountant Tools