# How We Processed 600 Real Tax Invoices in 4.5 Minutes Using a Dual-Engine Gemini AI & Vertex AI Architecture

> Source: <https://dev.to/digitax_do/how-we-processed-600-real-tax-invoices-in-45-minutes-using-a-dual-engine-gemini-ai-vertex-ai-2gel>
> Published: 2026-11-04 22:46:21+00:00

Manual data entry remains the single biggest bottleneck for Certified Public Accountants (CPAs) and SMEs in Latin America and the Caribbean. In the Dominican Republic, preparing the monthly **DGII Form 606 (Purchases)**, **Form 607 (Sales)**, and **IT-1 (VAT/ITBIS)** declarations for a mid-sized business with 600 monthly receipts typically consumes **15 hours of manual typing and tax ID validation**.

At **[DiGitax Suite](https://digitax.do)** ([Corporate Profile — DiGitax LLC](https://digitax.do/company)), we engineered a dual-engine AI document processing pipeline that cuts those 15 hours down to **4 minutes and 31 seconds** with **100% field extraction accuracy**—while keeping daily AI ingestion free for accountants.

Here is the architecture and the full benchmark data from our **[600-Invoice AI Case Study (Gemini AI vs. Vertex AI)](https://digitax.do/escaneos-ia-gemini-vertex-digitax)**.

Most accounting scanners fail in production for two reasons:

`B02`), and duplicate PDFs. If an OCR tool blindly dumps all of that into the ledger, the accountant spends more time cleaning up the mess than typing it manually.`0 Credits` vs. `6 Credits/doc`)
Instead of forcing every document through an expensive enterprise endpoint, **[DiGitax](https://digitax.do)** routes documents across two specialized engines backed by a **[Unified Non-Expiring Prepaid Credit Wallet](https://digitax.do/creditos-lotes-precio-digitax)**:

| Metric / Capability | Track 1: Google Gemini AI ( `0 Credits / $0.00 Free` ) | Track 2: Google Cloud Vertex AI ( `6 Credits / doc` ) | 
|---|---|---|
| **Target Workload** | Continuous daily ingestion (WhatsApp, mobile app, email) | End-of-month bulk closures & multi-page PDF batches | 
| **Throughput Speed** | **45 documents / hour** (+20 free scans/day per Google key) | **1,500 to 4,000 documents / hour** (~4.5 min per 300 docs) | 
| **Multi-Invoice PDF Splitting** | Up to 3 invoices per PDF | **Unlimited** (splits 50–100 page stapled PDFs automatically) | 
| **Extraction Accuracy (RNC, NCF, ITBIS)** | **100%** | **100%** | 
| **Cost per Document** | **$0.00 USD (0 Credits)** | **$0.0042 – $0.0060 USD (6 Credits)** | 

`Declarados` vs. `Descartados`
Before any extracted document touches the General Ledger, it passes through our **[4-Filter DGII Validation & Depuration Pipeline](https://digitax.do/ingesta-inteligente-depuracion-facturas-606#flujo-bandeja-fiscal)**:

**Fiscal & Accounting Track (Left Rail):**

`Procesados` → `Contabilizados` → `RNC Activo`) and voucher sequence (` NCF Serie B` / `e-CF Serie E` under **Control & Depuration Track (Right Rail):**

`Pendientes` → `Incidencias` → `[RNC + NCF]` duplicates are automatically diverted to