TDL Essential is Tally Education's online course in Tally Definition Language (TDL), the programming language used to customise and extend TallyPrime.
Learn Tally Definition Language (TDL) online and customise TallyPrime: components, formatting, variables, actions, objects and collections, UDFs, reports and printing. 34 hours, 1-year access, Tally Education certificate.
online
34 hrs
₹8100
₹7200
Knowledge of Tally Required (Suitable for Intermediate / Advanced Tally Users)
TDL Essential is Tally Education's online course in Tally Definition Language (TDL), the programming language used to customise and extend TallyPrime. In about 34 hours of self-paced lessons you learn TDL components, formatting, variables, buttons and keys, actions, objects and collections, user-defined fields, reports and printing. You need to know TallyPrime, but no coding experience is required. The course is 100% online, with 1-year access to the learning portal and a certificate from Tally Education.
Fee and inclusions last checked: 1 October 2026
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Fill in the short student details form that opens right after payment.
Our team sets up your account on the learning portal and shares your login details with you.
Study TDL Essential through video lessons, practice files and quizzes, and join live doubt-clearing sessions when you get stuck.
Sit the online assessment at the end of the course.
Receive your Tally Education certificate, which employers can verify online.
Tap a module to see what it covers.
How TallyPrime is built, the TDL language and what you can customise.
This Module introduces TallyPrime Architecture & Technology, detailing the platform, TDL language, and Interpreter Layers. It covers Data Management & multiple Output capabilities, Customisation, and integration. This Module also provides insights on customising TallyPrime, explores design patterns and principles, and presents an overview of TDL features and capabilities from a developer’s perspective.
Install TallyPrime Developer and work with TDL projects, files and source code.
This Module focuses on the TallyPrime Developer Application, guiding users through its installation and license management. It delves into the features of TallyPrime Developer, including how to work with TDL projects and files. It also explains the various explorer windows such as Project Browser, Definition Browser, and Function Browser, along with the Editor and Output windows. Additionally, it covers navigating and understanding Tally Source Code, Folder Structures, File Naming Conventions, and the use of TallyPrime Developer shortcuts.
Definitions, attributes, data types, functions, symbols and your first TDL program.
This Module provides a comprehensive overview of TDL components, including definitions, attributes, and modifiers. It explains about different data types, operators, and expressions used in TDL, along with various functions. It also covers the usage of symbols and prefixes, such as access specifiers and general symbols for commenting and code structuring. Additionally, it details TDL interfaces like menus, reports, forms, parts, lines, and fields, we will also learn about writing a TDL program.
Height, width, spacing, alignment, borders, styles and colours.
This Module explores the Dimensions and Formatting in TDL, covering Measurement for Dimensions and its Attributes. It explains about the Height and Width attribute for various Definitions (Forms, Parts, Lines, Fields) and explains Spacing attributes such as Space Top, Bottom, Left, and Right. It also covers Alignment attributes for Parts, Lines, and Fields, including Horizontal and Vertical alignment. Additionally, it addresses specific attributes like Inactive and Invisible, and delves into Definitions and Attributes for Formatting, including Borders, Styles, Colors, and Background Formatting.
Variables and their scope, plus buttons and keys with actions.
This Module introduces the concept of Variables in TDL, explaining how to define and use them effectively. It discusses various attributes of a Variable, including Type, Default, Persistent, Volatile, and Repeat. It also covers variable declaration and scope, distinguishing between Local and Global declarations, and explains how Fields can act as Variables. Additionally, it delves into modifying Variable values and provides an overview of Buttons and Keys, detailing their attributes such as Title, Key & Actions.
Tally's object and voucher structure, and collections for filtering, sorting and grouping data.
This Module will explain about Objects and Collections within TDL. It begins with an overview of Interface and Data Objects, then it details the Tally object structure and the basic voucher structures for accounting, inventory, and accounting-cum-inventory vouchers. It discusses the association of objects with interfaces at various levels, including reports, parts, lines, and fields, and explores methods within objects. It also covers understanding collections, their types, sources, and capabilities, such as Data Retrieval, Filtering, Sorting, Grouping, and Aggregation, along with the usage of Collections as Tables and Related Functions.
Global and object-specific actions, and how to attach them to menus, buttons and fields.
This Module delves into the various actions available in TDL, starting with an introduction to Categories of Actions and Global Actions. It covers Menu-related actions, Object Modification, URL Browsing, and the Creation, Display, and Alteration of collections, along with their Attributes. It also explains Triggers, Reports, and Variables. It details Object-Specific Actions, including Menu actions, Form actions, Part actions, Line actions, and Field actions. Furthermore, it discusses Action Associations at Menu, Button/Key, and Field Definitions, the Components of Actions.
User-defined fields to store extra data, plus validations and controls.
This Module focuses on User-Defined Fields (UDF) in TDL, starting with their Creation and the Storage of user input. It explains how to Retrieve values from UDF and classifies them into Simple and Aggregate Types, including Methods for storing single and multiple values and creating Collections of values stored in UDF. It also covers Validations and Controls Mechanisms, detailing Field, Form, and Report Attributes like Validate, Unique, Notify, and Control.
Tabular, hierarchical, column-based and graphical reports, and printing.
This Module explores various types of Reports in TDL, including Tabular, Hierarchical, Exploded, Column-Based, and Graphical Reports. It provides detailed instructions on designing each report type, highlighting their unique features and functionalities. Additionally, it covers printing techniques, explaining how to implement Menu and Button Actions for Printing, manage Page Breaks, and Print Images. It also lists frequently used Attributes and Functions related to Printing, offering guidance on their application to enhance report output.
This syllabus is indicative and may be updated to reflect new TallyPrime releases and updates to Tally Education's curriculum.
Accountants who want to customise TallyPrime for their own business or clients.
Start a path towards roles such as TDL Developer, Tally Customisation Specialist or Tally Integration Consultant.
Get certified in TDL Essential by Tally Education.
Learn a niche, practical skill that combines accounting and programming.
The assessment is a 60-minute online test of multiple-choice questions based on business case scenarios. You need at least 70% to pass. Tally Education then issues a digital certificate that can be verified on the Tally Education website, with a grade instead of a percentage. If you do not pass the first time, you can retake the assessment for a re-examination fee.
TDL Essential needs working knowledge of TallyPrime. If you do not have it yet, these online courses come first.
Basic to intermediate TallyPrime, all 3 levels, ₹16,520.
Advanced GST, TDS, TCS and payroll in TallyPrime, ₹17,700.
Customise TallyPrime with TDL, ₹7,200.
Authorised Training and Assessment Partner, and the only one in Baguiati
students trained at our Baguiati centre
from 87 reviews (September 2026)
teaching accounts and Tally
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TDL Essential is Tally Education's online course in Tally Definition Language (TDL), the programming language used to customise and extend TallyPrime.
No. You need working knowledge of TallyPrime, but no prior coding experience is required.
It is 100% online and self-paced, with about 34 hours of lessons in English and Hindi on the Tally Education portal. You get 1 year of access.
No. TDL Essential is a fully online, self-paced course without live one-to-one sessions.
The assessment is a 60-minute online test of multiple-choice questions based on business cases. You need at least 70% to pass. If you do not pass, you can retake it for a re-examination fee.
Tally Education issues a digital certificate that can be verified on its website, with grade A+ for 90% and above or A for 70% to 89%.
It is a first step towards roles such as TDL Developer, Tally Customisation Specialist and Tally Integration Consultant.
Start with our TallyEssential online course to learn TallyPrime, then take TDL Essential.
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