Invoice Biz: Expense Tracker is a free iPhone and Android app that generates fully VAT-compliant invoices in under 60 seconds: automatic VAT calculation at any rate, your VAT registration number on every invoice, clear pre-VAT and VAT-amount line items, and instant PDF sharing via email or WhatsApp — no account required, works in all VAT countries.
If your business is VAT-registered — whether you're in the UK, UAE, Saudi Arabia, or anywhere else in Europe or the Middle East — every invoice you issue needs to meet specific VAT requirements. Miss any of them and your customer can't reclaim the VAT, which creates friction, disputes, and a poor impression of your business.
The good news: creating a fully VAT-compliant invoice from your phone takes about 60 seconds with the right app.
What does a VAT-compliant invoice actually need to include?
VAT invoice requirements vary slightly by country, but the core elements are consistent across the UK (HMRC), UAE (FTA), Saudi Arabia (ZATCA), and EU member states:
- Your business name, address, and VAT registration number
- Customer's name and address (and their VAT number for B2B invoices)
- A unique sequential invoice number
- Invoice date and tax point date
- Description of goods or services supplied
- Net amount (excluding VAT), VAT rate, VAT amount, and gross total
- For the UAE/KSA — invoices must also be available in Arabic
Getting all of this right manually in a Word template is time-consuming and easy to get wrong. An invoice app handles it automatically every time. If you're also dealing with GST in countries like India, Australia, or New Zealand, see our guide on how to send a GST invoice from your phone.
How does the app generate a compliant VAT invoice automatically?
Invoice Biz is a free iPhone and Android app that generates fully VAT-compliant invoices with all required fields, automatic tax calculations, and professional PDF output — ready to share instantly.
| Creating VAT Invoices Manually | With Invoice Biz |
|---|---|
| Calculate VAT manually — risk of errors | VAT calculated automatically at your configured rate |
| Type VAT registration number on every invoice | VAT/GST number stored once, appears on every invoice |
| Format invoice to meet compliance requirements | All required fields included automatically (pre-VAT, VAT, total) |
| Save PDF manually, organize filing system | Share PDF instantly via email or WhatsApp, auto-archived |
| Different VAT rates require manual calculation per line | Custom tax rate per line item for mixed-rate invoices |
Set up your VAT rate once
Enter your VAT rate in settings — 20% for the UK, 5% for the UAE and Saudi Arabia, or whichever rate applies to your business. The app applies it automatically to every invoice going forward.
Your VAT number appears on every invoice
Enter your VAT registration number in your business profile and it appears automatically on every invoice generated — no manual entry each time, no risk of forgetting it.
Net, VAT, and gross clearly itemised
The invoice automatically shows the net amount, the VAT amount, and the gross total — clearly separated exactly as required for a valid VAT invoice.
Quote First, Invoice Later
For businesses that provide estimates before confirming a sale — very common in construction, trade services, and professional services — the Quotations feature lets you send a professional quote first, then convert it to a VAT-compliant invoice in one tap when the client confirms. No re-entering details, no duplicate work, everything organised per business.
Can the app handle multiple VAT rates on the same invoice?
Some businesses deal with multiple VAT rates — for example in the UK where most goods are standard-rated at 20% but some are reduced-rated at 5% or zero-rated. The app supports different tax rates per line item within the same invoice, so mixed-rate invoices are handled cleanly.
Does the app support VAT invoicing requirements in the UAE and Saudi Arabia?
For businesses operating in the Gulf, the app's Arabic language support means invoices can be generated and shared in Arabic — meeting the bilingual requirements of UAE and KSA VAT regulations. The 5% VAT rate is configurable in settings, and the invoice format meets FTA and ZATCA requirements.
How do you keep track of VAT collected across different reporting periods?
The expense tracking and P&L reports connect your VAT-collected data to your overall financial picture. While the app doesn't file VAT returns directly, having clean categorised records of VAT charged across each period makes the filing process significantly faster — whether you're filing with HMRC, the FTA, or ZATCA.
How do you plan ahead for quarterly VAT payments so they don't catch you short?
One often-overlooked aspect of VAT registration is that VAT collected isn't your money — it needs to be remitted to the tax authority on a quarterly or monthly basis. The Budget feature helps you plan for this by setting aside the right amount each month, while the cash flow forecast ensures VAT payment dates don't catch you short.
Is the app free to download, and what does the Pro version include?
Invoice Biz is free on iPhone and Android with no account required. The Pro upgrade — covering P&L reports, budget tracking, cash flow forecasting, cloud backup, and WhatsApp payment reminders — is available at $1.99/month, $9.99/year, or $15.99 lifetime.
Available in 14 languages including Arabic, with full multi-currency support — ideal for businesses operating across borders in the EU, GCC, or beyond.
Frequently Asked Questions
Which countries' VAT systems does the app support?
The app supports any country with a VAT, GST, or similar consumption tax — including the EU, UK, India, Australia, Canada, New Zealand, Singapore, UAE, and others. You configure your tax rate in settings, and it applies automatically to every invoice. Multi-currency support handles cross-border invoicing natively.
How do you add your VAT registration number to invoices?
Enter your VAT/GST registration number once in your business profile settings. After that, it appears automatically on every invoice you generate — you never need to type it again. The same applies to your business name, address, and any other required fields.
Can the app handle multiple VAT rates on the same invoice?
Yes — you can apply different tax rates to individual line items within a single invoice. This is useful for businesses in countries like India (multiple GST slabs) or the EU (standard vs. reduced rates for different product types). The subtotal, tax amount, and total are calculated and displayed separately for each rate.
Is the VAT invoice PDF format accepted by tax authorities?
The PDF output includes all fields typically required for VAT compliance: supplier details, customer details, VAT registration number, invoice number and date, line item descriptions, pre-VAT subtotal, VAT amount, and total payable. It meets the documentation requirements for your customer's input VAT claims. Always verify with your local accountant for jurisdiction-specific requirements.