PayTax.NZ Feature Update: Automatic IR3B Income Tax Calculation and Mistral AI-Powered Audit Classification
Updated At : Sun, Jun 28, 2026
For self-employed people, sole traders, freelancers, contractors, and side-hustle workers in New Zealand, tax time is often not difficult because the business does not have records. It is difficult because those records need to be organised, classified, checked, and converted into the information required by Inland Revenue.
In the latest version of PayTax.NZ, we have further connected daily bookkeeping, GST, fixed asset depreciation, income tax, and IR3B reporting. We have also introduced Mistral AI-powered audit classification to help users organise their financial data more accurately and efficiently.
This update is designed to make PayTax.NZ more than a record-keeping tool. It is becoming a practical tax management workspace for New Zealand sole traders.
1. Automatic Income Tax Calculation: From Daily Records to Annual Tax Results
Traditionally, preparing income tax information requires sole traders to manually collect annual income, business expenses, asset depreciation, GST-related adjustments, and other figures before completing their annual tax return.
This process can be time-consuming and error-prone.
With the new automatic income tax calculation feature, PayTax.NZ can use the financial data already recorded in the system to calculate and summarise key income tax information, including:
- Annual business income
- Deductible business expenses
- Fixed asset depreciation
- IR3B-related income and expense categories
- Net profit or loss for the tax year
- Key figures required for income tax reporting
Instead of manually copying numbers from different modules or rebuilding spreadsheets at the end of the financial year, users can maintain their records throughout the year and let PayTax.NZ prepare a clearer tax summary when it is time to file.
2. Automatic IR3B Calculation: Making Business Income Reporting Easier
IR3B is an important part of the New Zealand individual income tax return for many sole traders. It helps report business income, business expenses, and the final taxable profit or loss.
The latest PayTax.NZ update connects IR3B calculation with income records, expense records, fixed assets, and depreciation data already stored in the system.
This means:
- Income records can be summarised into the relevant business income sections
- Expenses can be grouped into IR3B-related expense categories
- Fixed asset depreciation can be reflected in annual business expenses
- The system can generate the main IR3B figures automatically
- Users can better understand where each number comes from
Compared with preparing IR3B manually, automatic calculation does not only save time. It also helps reduce mistakes and makes the annual filing process easier to review.
3. Mistral AI-Powered Audit Classification: Smarter Transaction Review
In addition to automatic tax calculation, this update also introduces Mistral AI-powered audit classification.
In real business scenarios, users often need to answer questions such as:
- Which expense category should this transaction belong to?
- Could this transaction affect GST?
- Is this expense related to the business?
- Which records should be reviewed before tax filing?
- Are there inconsistent or suspicious classifications?
Mistral AI-powered audit classification helps PayTax.NZ analyse income, expenses, and business records based on transaction descriptions, amounts, categories, and context. It can provide classification suggestions and highlight records that may need review.
It can help users:
- Identify common business expense types
- Suggest more suitable tax categories
- Highlight transactions that may require manual review
- Reduce inconsistent or duplicated classifications
- Improve the efficiency of year-end tax preparation
AI does not replace the judgement of the user, accountant, or tax adviser. Instead, it works as an intelligent assistant that helps users find issues earlier, organise records faster, and prepare tax information with more confidence.
4. A Complete Workflow from Bookkeeping to Tax Preparation
The goal of PayTax.NZ is to help sole traders prepare for GST, income tax, and IR3B as part of their normal bookkeeping workflow, rather than starting from scratch at the end of the financial year.
With the latest update, users can manage the following in one system:
- Record income and expenses
- Manage customers and invoices
- Maintain fixed assets
- Calculate depreciation automatically
- Organise GST information
- Calculate income tax automatically
- Generate IR3B-related results
- Use AI-assisted audit classification
- Review key data before filing
This turns PayTax.NZ from a simple bookkeeping system into a more complete tax management platform for New Zealand self-employed workers.
5. Why This Update Matters
For many sole traders, the biggest challenge is not running the business. It is finding the time and confidence to deal with tax details correctly.
This update focuses on solving three common problems.
1. Less Manual Calculation
PayTax.NZ can automatically generate income tax and IR3B-related results from existing records, reducing the need for spreadsheets and repeated manual calculations.
2. Fewer Classification Errors
With Mistral AI-powered audit classification, the system can help review transaction categories and identify potential issues earlier.
3. More Confidence at Tax Time
Users can understand the source of each tax figure more clearly, including income, expenses, depreciation, and taxable profit or loss.
6. Who Is This Feature For?
This update is especially useful for:
- New Zealand self-employed workers
- Sole traders
- Freelancers
- Contractors
- Side-hustle workers
- Individuals who need to prepare IR3B information
- Users who want to reduce year-end tax preparation work
- Users who want AI assistance with transaction classification
Whether you are just starting a side business or already running a steady sole trader operation, PayTax.NZ helps connect your daily financial records with your annual tax reporting requirements.
7. Summary
The latest PayTax.NZ update brings automatic income tax calculation, IR3B preparation, and Mistral AI-powered audit classification into one connected workflow.
It helps users:
- Prepare annual income and expense summaries faster
- Organise IR3B data more clearly
- Handle fixed asset depreciation more accurately
- Review transaction classifications more efficiently
- Approach annual income tax filing with greater confidence
PayTax.NZ will continue to build practical, intelligent, and easy-to-use tax tools for New Zealand sole traders and self-employed workers.
This article is for general product information only and does not constitute tax, legal, or accounting advice. If your tax situation is complex, please consult a registered accountant or qualified tax professional.