How to File Your GST Return in myIR
The definitive walkthrough for New Zealand business owners. Master the myIR portal, understand every box on the GST101A, and ensure your compliance is airtight.
The 10-Second Rule
GST filing in NZ is done via the **GST101A** form in myIR. You report total income (**Box 5**) and total expenses (**Box 13**). Both must be **GST-inclusive**. The system does the math; you just need to submit and pay by the **28th** of the month following your period.
The Filing Workflow
1. Advanced Preparation
A smooth filing starts with organized data. You should have a "GST Audit Trail" report ready before you even open the IRD website.
What counts as "Total Sales" (Box 5)?
It's more than just your invoices. You must include:
- • **Standard Sales**: All products and services sold in NZ.
- • **Cash Sales**: Any under-the-counter or "off-book" cash received (legal requirement).
- • **Grants & Subsidies**: Most government grants (like Wage Subsidies) include GST.
- • **Bartering**: If you swap services with another business, the market value is taxable.
- • **Asset Sales**: If you sold a business vehicle or computer, the price included GST.
What counts as "Total Purchases" (Box 13)?
You can only claim GST if you have a valid Tax Invoice. Ensure you exclude:
- ❌ **Wages & Salaries**: There is no GST on employee pay.
- ❌ **Bank Fees & Interest**: These are "Exempt" supplies.
- ❌ **Drawings**: Money you take out for personal use.
- ❌ **Overseas Software**: Often no GST is charged (unless they are NZ-registered).
2. The Box-by-Box Guide (GST101A)
While the system auto-calculates many fields, understanding the logic prevents "fat-finger" errors.
The cornerstone of your return. Every dollar of NZ-based revenue goes here.
Include exports and services to overseas clients here. It subtracts from your Box 5 tax liability.
Your claimable expenses. Ensure you have invoices for everything over $50.
Used for credit notes, bad debts, or mixed-use assets (e.g. 20% personal use of a vehicle).
The 1/11th Error
Do not manually calculate the 15% GST and enter it into Box 5. The IRD system expects the **Total Inclusive Price**. If you enter just the tax amount, the system will divide *that* by 1.15, resulting in a massive under-payment and an automatic audit flag.
3. Step-by-Step myIR Walkthrough
Step 1: Access the Portal
Go to **myir.ird.govt.nz**. Use your individual or organization login. If you are a director of multiple companies, ensure you select the correct entity from the dropdown.
Step 2: Find the Filing Link
Click on **Returns and transactions**. Look for the "Goods and Services Tax" section. You will see a list of periods. Click the **"File return"** link next to the period marked as "Required".
Step 3: Data Entry
Enter your **Box 5** (Sales) and **Box 13** (Purchases). If you have exports, enter them in **Box 7**. If you have bad debts or vehicle adjustments, enter them in the adjustments section.
Step 4: The Declaration
Review the final amount in **Box 15**. If it's positive, you owe money. If it's negative (in brackets), you are getting a refund. Tick the declaration box and click **Submit**.
4. How to Pay Your GST Bill
Filing is only half the job. You must also pay the balance by the 28th to avoid late payment penalties.
Pay to IRD account: **02-0500-0016981-00**. Reference: Your IRD Number. Code: GST. Period: End date of the return.
The safest way. Set up a one-off or recurring direct debit within the myIR portal after you file.
5. Cloud Filing (Xero / MYOB / Hnry)
If you use modern accounting software, you should **never** have to manually enter figures into myIR. These tools connect directly to the IRD gateway.
Frequently Asked Questions
If the error is under $1,000 or 10% of your GST liability, you can just adjust it in your **next** return using the adjustments boxes. If it's larger, you must file an amendment in myIR.
File the return anyway! The penalty for late filing is separate from the penalty for late payment. You can then apply for an **Instalment Arrangement** in myIR to pay the bill over time.
Yes. The December return is due **January 15th** (instead of the 28th) due to Christmas. The March return is due **May 7th** to align with income tax deadlines.
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