How to Create Custom Invoices in Tally Prime using TDL (2026 Guide)

Why You Must Customize Your Tally Invoices

The default invoice format provided by Tally Prime is incredibly functional and legally compliant for basic billing.

However, in today's competitive landscape, your invoice is often the primary touchpoint between your business and your client. A generic invoice says nothing about your brand.

Furthermore, specialized businesses often require specific data fields—like batch numbers, expiry dates, custom tax structures, or dynamic UPI QR codes—that the default format simply does not accommodate.

This is where Tally Definition Language (TDL) becomes your most powerful asset. TDL allows you to completely deconstruct and rebuild the invoice layout to match your precise operational requirements.

Understanding the TDL Hierarchy

Before writing any code, it is critical to understand that TDL is a hierarchical, declarative language. You do not write procedural execution steps; you define the structure of UI elements. The hierarchy for printing works like this:

• Report: The main container (e.g., the entire invoice).
• Form: The printable canvas inside the report.
• Part: Sections of the form (Top, Body, Bottom).
• Line: Horizontal rows within a part.
• Field: The actual data elements (text, numbers, variables) inside a line.

Step 1: Writing Your First TDL Customization

Let’s start with a practical example. We want to add a custom bold title to the very top of our invoice and add specific company terms at the bottom.

Create a plain text file on your computer and name it custom-invoice-techidea.txt. Open it in Notepad or VS Code and paste the following snippet:

;; 1. Altering the Default Form
[#Form: Comprehensive Invoice]
  ;; Adding a new Part at the top
  Add : Top Part : Before : EXPINV Top : TechIdea Custom Title
  
  ;; Adding a new Part at the bottom
  Add : Bottom Part : After : EXPINV Bottom : TechIdea Custom Terms

;; 2. Defining the Top Title Part
[Part: TechIdea Custom Title]
  Line : TechIdea Title Line

[Line: TechIdea Title Line]
  Field : Simple Field
  Local : Field : Simple Field : Info : "TAX INVOICE - CUSTOMIZED BY TECHIDEA"
  Local : Field : Simple Field : Style : Large Bold
  Local : Field : Simple Field : Align : Center
  Local : Field : Simple Field : Full Width : Yes

;; 3. Defining the Bottom Terms Part
[Part: TechIdea Custom Terms]
  Line : TechIdea Terms Line 1, TechIdea Terms Line 2

[Line: TechIdea Terms Line 1]
  Field : Simple Field
  Local : Field : Simple Field : Info : "TERMS: Payment due within 15 days."

[Line: TechIdea Terms Line 2]
  Field : Simple Field
  Local : Field : Simple Field : Info : "Thank you for your business!"
      

Step 2: Loading the TDL File in Tally Prime

Once your code is written, you need to execute it within Tally Prime:

1. Open your Tally Prime application.
2. Navigate to the top menu and click on F1: Help, then select TDL & Add-Ons.
3. Press F4 (Manage Local TDLs).
4. Change the option "Load selected TDL files on startup" to Yes.
5. In the list below, enter the exact file path to your custom-invoice-techidea.txt file.
6. Press Enter to save and accept the screen.

Now, open any Sales Voucher and press Ctrl+P to print. You will see your custom title beautifully centered at the top and your custom terms at the bottom!

Advanced Use Cases: Why Hire an Expert?

While the snippet above is great for learning, real-world business requirements are vastly more complex. What if you need to fetch specific Ledger Alias names?

What if you need to generate a dynamic UPI QR Code based on the invoice total?

What if you need complex calculations for multi-tier salesperson commissions printed directly on the copy?

With over 13 years of hardcore TDL experience, TechIdea specializes in these exact complex implementations. If you are struggling with TDL or need a robust, error-free module tailored to your exact workflow, explore our Tally Customization Services and book a free technical consultation today.