Next gen ONESOURCE Corporation Tax (Next gen OCT) - Getting started guide

Oct 25, 2026

Next gen ONESOURCE Corporation Tax (Next gen OCT) provides an overview of the core components and setup flow for a SaaS corporation tax and e-filing application from Thomson Reuters. The guide explains how to access OCT through the ONESOURCE Platform, launch the calculation management screen, and configure key building blocks such as entities, groups, datasets, sheets, custom line items, rows, client templates, chart of accounts mappings, and trial balance imports. It also covers transition from Legacy OCT, including configuring entities and selecting transition strategies.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages29

Reading Time1 h 13 min

AccessFree to download

1 Introduction

2 Accessing OCT

3 Next gen OCT components

3.1 Entities & Groups

3.2 Datasets/Calculations

3.3 Calculation sheets

3.4 Custom line items

3.5 Adding rows to analysis sheets

3.6 Client Templates

3.7 Chart of accounts & mappings

3.8 Trial Balance imports

3.9 Other items

3.9.1 Using SORT

3.9.2 Right-click menus

4 Transitioning from Legacy OCT

4.1 Completing the “configure entities” file

4.2 Transition Strategies

4.3 Other considerations

Next Generation ONESOURCE Corporate Tax Getting started TABLE OF CONTENTS 1 Introduction .................................................................................................................................... 2 2 Accessing OCT ................................................................................................................................. 3 3 Next gen OCT components ............................................................................................................. 4 3.1 Entities & Groups .................................................................................................................... 4 3.2 Datasets/Calculations ............................................................................................................. 5 3.3 Calculation sheets ................................................................................................................... 8 3.4 Custom line items ................................................................................................................. 10 3.5 Adding rows to analysis sheets ............................................................................................. 13 3.6 Client Templates ................................................................................................................... 13 3.7 Chart of accounts & mappings.............................................................................................. 15 3.8 Trial Balance imports ............................................................................................................ 19 3.9 Other items ........................................................................................................................... 22 3.9.1 Using SORT .................................................................................................................... 22 3.9.2 Right-click menus .......................................................................................................... 23 4 Transitioning from Legacy OCT ..................................................................................................... 24 4.1 Completing the “configure entities” file ............................................................................... 25 4.2 Transition Strategies ............................................................................................................. 27 4.3 Other considerations ............................................................................................................ 29 Next gen ONESOURCE Corporation Tax (Next gen OCT) is the new SAAS corporation tax and e-filing application from Thomson Reuters. The purpose of this document is to provide you with a basic overview of core areas of Next gen OCT as a guide for getting started with the product. This will include an overview of the following features: 􀁸 Entities 􀁸 Groups 􀁸 Datasets 􀁸 Sheets 􀁸 Custom Line Items 􀁸 Rows 􀁸 Client Templates 􀁸 Chart of accounts and mappings 􀁸 TB imports 􀁸 SORT This document walks through the process of setting up and completing a calculation touching on the use of each of the above. If you are a completely new customer to Next gen OCT, start from the beginning. However, if you use the legacy version of the product (Legacy OCT), you have an opportunity to transition some of your data from Legacy OCT as part of your set up of Next gen OCT. This document assumes that you have already been provided with access to Next gen OCT and have received the appropriate login information. The document does not cover how to set up users as this is covered by e-learning of the ONESOURCE administration module which you should have access to. There is also an introductory e-learning module to Next gen OCT as well as a module to cover the tools. These are available through ONESOURCE University. If you do not have access to this, please contact your Relationshi

FAQs

How do you access OCT through the ONESOURCE Platform?

Access the ONESOURCE Platform, enter your username and password, and sign in. From the ONESOURCE homepage, select the “Corporate Tax” tile to launch OCT.

What are the first setup steps for a new customer in Next gen OCT?

Start from the beginning and ensure you have received access and login details. After completing the relevant e-learning modules, begin configuring core tax calculation areas such as entities and groups.

How does the guide handle transitioning data from Legacy OCT?

If you use Legacy OCT, the guide explains how to transition some data during your Next gen OCT setup. It includes steps for completing the “configure entities” file and choosing transition strategies.

Oct 25, 2026

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