Product
BlackZero is built natively for the per-taxpayer BIR registration model. Not a foreign accounting tool retrofitted for Philippine compliance — a system designed around the CAS Annex B requirements and the EIS transmission pipeline from the ground up.
The three pillars
Most accounting tools address one of these. BlackZero does all three — and they are designed to work together, not bolted together.
Auto-generates your complete BIR CAS registration packet — Annex A-1, A-2, A-3, sample invoice, and system documentation guide — formatted for RDO submission. Under 10 minutes. Flat fee ₱1,500.
How CAS registration works →Every invoice you post is automatically signed (JWS), encrypted, and transmitted to BIR within the 3-day window. BIR acknowledgements are archived against the original document. Transmission status is visible in real time.
How EIS transmission works →All 7 BIR-mandated books of accounts — General Ledger, Cash Receipts, Cash Disbursements, Sales Journal, Purchase Journal, Subsidiary Sales Ledger, Subsidiary Purchase Ledger — maintained automatically. SAF export on demand.
How books work →Why it matters
BIR's CAS/EIS framework requires every taxpayer TIN to have its own Acknowledgement Certificate and Permit to Transmit. There is no shared registration. BlackZero's architecture is built around this model — every tenant has an isolated compliance state, independent AC tracking, and its own transmission pipeline.
BIR's e-invoicing mandate takes effect 31 December 2026.