Who is this guide for?
Owners, managers, and operations teams running centers and service businesses in Spain who need clearer processes around billing—without guesswork.
What your invoice must include
A compliant invoice needs complete, consistent data. This checklist helps you avoid common accounting mistakes.
- Invoice number (sequential)
- Issue date
- Issuer data (name, tax ID, address)
- Customer data (name and tax ID when needed)
- Service description
- Tax base, VAT treatment (or exemption), and total
Simple example
Service: Therapeutic physiotherapy session
Tax base: 45.00 EUR
VAT: Exempt (art. 20.Uno.3 LIVA)
Total: 45.00 EUR
Common errors
- Broken numbering or missing sequence
- Vague concepts ("misc services")
- Wrong VAT applied to service type
- Incorrect exemption or withholding display
Why this matters for leadership and day-to-day work
Clean invoices reduce payment delays, cut repeat work for admin staff, and improve trust with clients, insurers, and corporate clients.
Recommended team way of working
- Use one standard invoice concept structure
- Define VAT/exemption rules by service type
- Review customer tax data before issuing
- Send PDF immediately and track payment status
How Halthia helps
Halthia generates compliant PDFs with consistent numbering and automated calculations, reducing manual errors.