How does AI document extraction work for invoices and receipts?

The AI OCR engine scans uploaded documents - photos of receipts, PDF invoices, bank statements - and automatically extracts key fields like vendor name, date, amount, VAT, and line items. The extracted data is pre-filled into the appropriate form, so the user only needs to review and confirm rather than type everything manually.

Why is number-to-words conversion important for invoices?

In many countries, including Bulgaria, invoices must display the total amount written out in words (e.g., 'one thousand two hundred and fifty BGN') as a legal requirement. This prevents tampering and ensures the document is legally valid. Our system generates this automatically in the correct language and currency.

Can the platform handle multiple currencies and exchange rates?

Yes. The platform supports BGN, EUR, and USD with configurable exchange rates. Users can set their base currency and the system automatically converts totals when generating invoices in a different currency. Exchange rates can be updated manually or pulled from a reference source.

How does role-based access work for accountants and business owners?

The platform supports three roles: admin (full access to all features and settings), accountant (can create and manage invoices, expenses, and reports for assigned clients), and viewer (read-only access to documents and dashboards). This lets accounting firms manage multiple clients from a single account without exposing sensitive settings.

From 15 Minutes to 2: AI-Powered Invoicing for Small Business

For most small businesses and freelancers, invoicing is a necessary chore that eats into billable hours. Open a Word template, copy client details, calculate line items, add VAT, convert the total to words (a legal requirement in many countries), export to PDF, and send. Fifteen minutes per invoice, multiplied by dozens of invoices per month, adds up to entire working days lost to administrative busywork.

EasyInvoiceSoft was built to eliminate that friction. The goal was an AI-powered financial platform purpose-built for small businesses - one that handles invoicing, expense tracking, and financial reporting without the complexity or price tag of enterprise accounting software. Here is how we made it happen.

Project: invoice.prolevelsolutions.com

The Challenge

The client came to us with a clear observation: existing invoicing tools fell into two camps. Simple tools that could generate a basic invoice but lacked multi-currency support, proper tax compliance features, and expense tracking. And complex enterprise platforms like SAP or QuickBooks that were powerful but expensive, difficult to set up, and designed for companies with dedicated accounting departments.

Small businesses in Bulgaria and across Eastern Europe needed something in between - a tool that was simple to use but handled the real-world complexity of running a business:

Legal formatting requirements including automatic number-to-words conversion on invoice totals, sequential invoice numbering, and proper VAT line-item breakdown
Multi-currency support for BGN, EUR, and USD with configurable exchange rates - essential for businesses that invoice international clients
Expense and income tracking with categories, attachments, and financial analytics - not just invoicing, but a full financial picture
AI-powered document extraction to eliminate manual data entry from receipts, bank statements, and supplier invoices
Role-based access so accountants could manage multiple client accounts, while business owners retained control over their own data

The platform had to feel instant. A business owner should be able to create a professional, legally compliant invoice in under two minutes - including selecting a client, adding line items, and exporting to PDF.

Our Solution

We built EasyInvoiceSoft as a React and TypeScript application on Supabase, with AI document extraction and a focus on speed and compliance at every step.

Intelligent Invoice and Quote Builder

The core of the platform is a fast, keyboard-friendly invoice builder. Users select a client from their saved contacts (or create one inline), add line items from their product/service library (each with a default VAT rate), and the system instantly calculates subtotals, per-item VAT, and the grand total. The total is automatically converted to words in the correct language and currency - no manual formatting required. Invoices and quotes can be exported to PDF via jsPDF or to Excel via XLSX export, ready to send or archive.

AI OCR Document Extraction

One of the biggest time sinks for small businesses is manually entering data from paper receipts, supplier invoices, and bank statements. We integrated an AI-powered OCR engine that lets users photograph or upload a document, and the system automatically extracts vendor name, date, individual line items, amounts, and VAT. The extracted data is pre-filled into an expense or income record, and the user simply reviews and confirms. This single feature eliminated hours of manual data entry per month for early users.

Multi-Currency with Exchange Rates

The platform supports three currencies - BGN, EUR, and USD - with user-configurable exchange rates. When creating an invoice in a currency different from the base, the system automatically calculates and displays the converted total. This is critical for Bulgarian businesses that invoice EU clients in EUR but file taxes in BGN.

Expense and Income Tracking

Beyond invoicing, the platform tracks all business expenses and income in categorised records with file attachments. Users can upload receipt photos, assign categories (travel, office supplies, software, etc.), and tag entries by client or project. A financial analytics dashboard aggregates this data into monthly summaries, category breakdowns, profit/loss views, and VAT reports - giving business owners a real-time snapshot of their financial health.

Client and Product Libraries

Repeat clients and common products/services are stored in reusable libraries. When creating a new invoice, users pick from saved clients (with pre-filled company details, VAT numbers, and addresses) and saved products (with descriptions, default prices, and VAT rates). This eliminates repetitive typing and ensures consistency across documents.

Role-Based Access Control

The platform supports three roles - admin, accountant, and viewer - validated through Supabase Row Level Security and Zod schema validation. Accounting firms can onboard multiple clients under a single account, with accountants accessing only the clients assigned to them and viewers limited to read-only dashboards. This multi-tenant architecture was designed from day one, not bolted on after the fact.

The Results

EasyInvoiceSoft delivered measurable improvements from the first week of use:

Invoice creation time dropped from 15 minutes to under 2 minutes with saved clients, product libraries, and automatic VAT and number-to-words calculation
AI document extraction eliminated manual data entry for receipts and supplier invoices, saving hours per month
Multi-currency support (BGN/EUR/USD) with exchange rates enabled international invoicing without manual conversions
Full tax compliance with per-item VAT, automatic number-to-words, and sequential numbering out of the box
Role-based multi-client management enabled accounting firms to manage all their clients from one platform
PDF and Excel export provided professional document formatting for every invoice, quote, and financial report

The platform proved that small business financial tools do not have to choose between simplicity and capability. By combining AI-powered automation with thoughtful UX design, EasyInvoiceSoft gave small businesses the same invoicing speed and financial visibility that enterprise tools provide - without the enterprise complexity or price.

Technology Stack

Technology	Role
React + TypeScript	Frontend with type-safe forms and real-time calculation engine
Supabase	Database, auth, Row Level Security for multi-tenant access control
jsPDF	Client-side PDF generation for invoices and quotes
XLSX Export	Excel export for financial reports and data portability
AI Document Extraction	OCR-powered extraction from receipts, invoices, and bank statements
i18next	Internationalisation for bilingual interface support
Zod	Runtime schema validation for forms, API inputs, and role permissions

The combination of Supabase's Row Level Security with Zod's runtime validation gave us a robust multi-tenant architecture where data isolation is enforced at both the database and application layers. jsPDF and XLSX export handle document generation entirely on the client, keeping the platform fast and reducing server costs.