How to Do a GST Return: Self-Filing in NZ, Canada and Ireland

NZ GST rate: 15% (IRD) · Canada GST/HST rate: 5% GST; HST up to 15% (CRA) · NZ GST registration threshold: NZ$60,000 (IRD) · Canada small supplier threshold: C$30,000 (CRA) · Ireland self-assessment paper return deadline: 31 October (Revenue)

Six rows, one pattern: the numbers that decide your filing obligations are set by each country’s tax authority, and none of them transfer across borders.

How do I file a GST return by myself?

Self-filing means you prepare and submit the return to the tax authority yourself — no accountant between you and the portal, no one else to double-check the figures. In return, you keep control of the deadline, the data, and the cost.

How do I file a GST return online?

• Use the official portal for your jurisdiction: Inland Revenue’s myIR in New Zealand, CRA GST/HST NETFILE in Canada, or Revenue Online Service (ROS) in Ireland.
• myIR gives you two filing options: enter the GST amounts yourself, or enter total sales and purchases and let the system do the calculation (Inland Revenue’s file-your-GST-return guide).
• Before you log in, assemble total sales and income, total purchases and expenses, and any debit or credit adjustments (Inland Revenue’s GST calculation guide).
• Keep the supporting records for seven years in New Zealand and six years in Canada (IRD; CRA).

Online filing is the fastest route in all three systems because the portal checks your arithmetic before the return lands. In myIR, for example, the assessment appears after you review the return details, so a typo is visible before you submit (Inland Revenue — NZ tax authority).

How do I file a GST return with IRD?

• You need an active myIR login with a GST account linked.
• The taxable period you’re filing must appear in Returns and transactions.
• Your sales and purchase totals should be ready before you open the form.

Once those are in place, the filing flow in myIR follows six steps:

1. Log in to myIR, open your GST account, and select Returns and transactions.
2. Select File return beside the taxable period you’re filing.
3. Confirm whether the return is a nil return.
4. Enter either the GST amounts or your total sales and purchases, depending on the option you chose.
5. Review the assessment myIR displays, and use Add receipts to attach tax invoices or correspondence.
6. Submit the return, then pay by direct debit, credit card, or debit card — or submit first and pay later.

Each step lives inside the same myIR session, which is why IRD recommends the online route over paper: the system confirms what you’ve entered, shows you the resulting assessment, and keeps a record of the transaction (Inland Revenue’s file-your-GST-return guide).

The deadline to remember: GST returns are generally due on the 28th of the month after the taxable period ends, and payment is due the same day as the return (Inland Revenue’s GST filing overview).

How do I file a GST/HST return online?

• Canada’s GST/HST return is filed online through GST/HST NETFILE, CRA’s business filing service.
• You must register once your taxable supplies exceed C$30,000; below that, you’re a small supplier (Canada Revenue Agency — federal tax authority).
• The rate is 5% GST in non-participating provinces and HST from 13% to 15% where the harmonized tax applies (CRA; Wikipedia’s overview of Canadian GST/HST).

The Canadian return asks for the same building blocks as the New Zealand one: sales, purchases, and adjustments. The difference is provincial — participating provinces combine the federal GST with a provincial sales tax into one HST rate, which is why the number varies by location rather than by business size.

The pattern: every GST return is the same shape — sales, purchases, adjustments — and the portal only does the arithmetic. The real work is the record-keeping that happens between filing dates, not the form itself.

The pattern: the filing deadline is the same for everyone; the difference between a smooth return and a scramble is usually the state of your records before you log in.

How to file a tax return in Ireland?

Ireland runs a self-assessment system, which puts the responsibility for calculating the final position on the taxpayer. For most self-employed people, that means one document: the Form 11, filed through Revenue Online Service (ROS).

How do I file a tax return for the first time?

• Register with Revenue (Irish Tax and Customs) before you file — a first return needs an active registration.
• Use ROS as the primary route; paper filing remains available as a fallback.
• Check the current year’s published dates before planning — Revenue’s Form 11 guidance separates paper and online deadlines.

The first-time trap in Ireland is registration timing. If you register after the filing window opens, you compress the time you have to gather income records, claim reliefs, and submit — and the deadline doesn’t move.

How do you submit your tax return?

• Submit through Revenue Online Service, which confirms the return immediately and keeps a copy in your ROS inbox.
• The return works from your income, allowances, and reliefs to calculate the tax due or the refund owed (Revenue — Irish Tax and Customs).
• Filing and paying are separate steps; you can file first and pay closer to the due date.

Because the system is self-assessment, the figures you enter are the figures that matter. Revenue can query them later, so the return should read like a document you’d defend — because you may have to.

How can I file my income tax return by myself?

• Work through the Form 11 in ROS field by field, using Revenue’s help pages for anything unfamiliar.
• Open income statements, receipts, and deduction records before you start — the same checklist Revenue publishes alongside the form.
• Submit early enough that a rejected or queried return can be fixed before the deadline.

Self-filing in Ireland costs nothing at the portal level and keeps you attached to the real story of your business — the income, the costs, and the difference between them.

How do I file a tax return for the first time?

The first return is harder than the tenth because there’s no rhythm yet. The cure is the same in every system: confirm you must file, register, gather documents, then open the portal with enough time to fix mistakes.

How do I register for income tax as a first-time filer?

• Confirm you actually need to file before registering; the requirement depends on income, source of income, age, and filing status (Revenue’s guidance).
• For GST, registration is turnover-based: NZ$60,000 annual turnover in New Zealand (Inland Revenue) and C$30,000 taxable supplies in Canada (CRA).
• In Ireland, registration with Revenue comes first; ROS won’t produce a Form 11 for an unregistered taxpayer (Revenue — Irish Tax and Customs).

Registering early costs nothing, and it removes the risk of discovering the threshold after the fact. GST registration thresholds are turnover tests, so a good sales month can change your obligations faster than your accountant’s schedule.

What documents should I prepare before filing?

• Sales and income records that add up to the totals you’ll enter (IRD’s filing checklist).
• Purchase and expense receipts, including GST paid on purchases if you’re claiming a credit.
• Records of any debit or credit adjustments, such as corrections or bad-debt write-offs (Inland Revenue’s GST calculation guide).

The order is records first, return second. Entering numbers without the paperwork behind them is how returns end up filed twice — once by you, and once by an assessment system working from its own data.

How can I file my income tax return by myself?

• Use the official portal — myIR, GST/HST NETFILE, or ROS — and skip services that charge for what the portals do free.
• Type figures from your records, not from memory.
• Finish before the deadline, then use the remaining days to double-check the big numbers.

The first self-filed return is also the one where mistakes are most likely, because there’s no prior return to compare against. Slow and careful beats fast and wrong.

The catch: first-time filing is a preparation problem, not a math problem. Get registration and records done early, and the form itself becomes the easy part.

The pattern: first-time filing rewards preparation, not speed; the filer who starts with documents finishes faster than the one who starts with the portal.

Who doesn’t have to submit a tax return?

The “everyone must file” line is wrong, and it makes careful people waste time on forms they didn’t need. The actual test is specific: income, source of income, age, and filing status — plus, for GST, a separate threshold based on turnover.

Who is not required to file an income tax return?

• People whose gross income stays below the applicable threshold for their age and filing status may be exempt (Revenue — Irish Tax and Customs).
• People with no tax liability may also be excused, but the rule depends on income source and entity type, so the exemption isn’t automatic.
• GST is separate: registration starts at NZ$60,000 turnover in New Zealand (Inland Revenue) and C$30,000 taxable supplies in Canada (CRA).

Exemption is not the same as silence. If a letter or a portal message says a return is expected, file it — many non-filing problems start with someone assuming a threshold covered them when it didn’t.

What filing exemptions apply to low-income taxpayers?

• Low-income thresholds are set annually and change with the tax year (Revenue’s Form 11 guidance).
• The calculation uses gross income, filing status, and age, not the amount left after spending.
• There’s no single dollar figure that works across countries; each authority publishes its own exemption tables.

The number on your payslip is not the number the threshold tests. Because exemptions are based on gross income, a taxpayer can be “low income” by any normal measure and still sit above the filing line.

Do I need to file if I had no taxable activity?

• For GST in New Zealand, yes: a registered person files for every taxable period, including a nil return (Inland Revenue’s filing guide).
• For income tax, no taxable activity usually means no return, provided income stayed below the threshold.
• For GST/HST in Canada, the same nil-return discipline applies to registered businesses (CRA’s GST/HST pages).

Nil returns look pointless but they do real work: each one tells the authority the business still exists, still knows its obligations, and still holds a valid registration. That’s worth the five minutes.

What is the minimum income to not file a tax return?

Fair question, messy answer: the minimum is different in every system, changes most years, and is calculated from gross income rather than what lands in your bank account.

How is the minimum income threshold calculated?

• Each tax authority sets its own thresholds and publishes them for the tax year (CRA’s GST/HST pages; Revenue’s guidance).
• The calculation typically uses gross income, filing status, and age.
• If your income is below the threshold and you owe no tax, you may be exempt; the caveat is that income source and entity type still matter.

There is no universal number to memorise. The relevant question is the one for your country, your filing status, and your source of income — everything else is noise.

Does the GST registration threshold use income or turnover?

• GST thresholds use taxable turnover, not personal income or profit.
• New Zealand: NZ$60,000 annual turnover (Inland Revenue).
• Canada: C$30,000 of taxable supplies (Canada Revenue Agency).

This distinction catches a lot of small businesses. A business can be low-profit and still cross the GST threshold, because the threshold is a revenue test, not a profitability test.

Where can I find current threshold tables?

• IRD publishes rates and thresholds in its GST guidance (Inland Revenue’s GST filing overview).
• CRA publishes the small supplier threshold in its GST/HST business pages (CRA).
• Revenue publishes income tax exemption limits and Form 11 deadlines each year (Revenue — Irish Tax and Customs).

Bookmark the official pages. Thresholds move between years, and this article’s numbers reflect the published rules at the time of writing — the current table on the authority’s site is the one that counts.

The trade-off: threshold questions are simple to ask but easy to misapply. The dollars change; the principle — turnover for GST, gross income for income tax — is what stays constant.

The catch: a threshold you don’t check is a deadline you might miss.

What happens if I do not submit a tax return?

Skipping a return doesn’t make the tax disappear. In every system covered here, the authority eventually gets its number — and the longer you wait, the more the bill grows.

What is the penalty for not filing my tax return?

• Late filing penalties are usually a percentage of the unpaid tax, plus interest (CRA’s GST/HST pages).
• In New Zealand, payment is due on the same day as the return, so a late return usually means late payment too (Inland Revenue’s GST filing overview).
• The exact amount depends on the balance and the jurisdiction; there’s no single flat fine across NZ, Canada, or Ireland (Revenue — Irish Tax and Customs).

The penalty clock starts at the deadline, and each system layers interest on top of the late-filing amount. That’s why the first missed return is always the cheapest one.

What happens if you don’t file a tax return for 5 years?

• The authority can file an assessment on your behalf using the data it already has — and that estimate is often higher than what you’d have reported (Inland Revenue).
• Penalties and interest accumulate across the entire period, not just the current year.
• Refunds or credits you were owed can be lost, or offset against the assessed debt.

Five years of silence reads as non-compliance, not forgetfulness. The system’s estimate becomes the bill, and the burden shifts to you to prove it wrong.

What happens if you don’t file a tax return for 10 years?

• Enforcement escalates: reminders become recovery proceedings, and the assessed amount can be collected through formal channels (CRA).
• Interest keeps compounding on the unpaid balance year after year.
• The practical result: a small missed return can grow into a much larger debt over a decade of compounding interest.

Ten years is the extreme case, but it makes the system’s logic visible: authorities don’t chase every return immediately — they assess, they wait, and they collect with interest. The cheapest moment to fix a missed return is always the first.

The implication: non-filing is a compounding problem, not a fixed fine. The cheapest moment to fix it is the first missed deadline; the most expensive is a decade later, when interest has done the arithmetic for you.

The takeaway: the cheapest moment to fix a missed return is the first deadline, not the last.

What’s confirmed and what to check yourself

Some parts of this process are stable enough to plan around. Others change every year, and only the official page knows the current number.

The pattern: the stable facts are structural — rates, thresholds, portals. The moving parts are the annual details, and those belong on the authority’s website, not in a blog post.

What the tax authorities say

The rules read dry until they apply to your own filing date. These three statements capture the part filers most often miss.

Every GST-registered person must file a GST return for each taxable period, including when the return is nil.

Inland Revenue — New Zealand’s tax authority

Once taxable supplies pass C$30,000, a business moves past the small supplier threshold and must register for and file GST/HST returns.

Canada Revenue Agency — federal tax authority

Self-assessed taxpayers file their income tax return using Form 11, with Revenue Online Service as the main route.

Revenue — Irish Tax and Customs

The takeaway: a GST return is a routine, not a reckoning, provided the records exist before the portal opens. For a New Zealand business at the NZ$60,000 turnover mark, the choice is clear: register before you cross it and file every period through myIR — or let late-filing penalties and interest turn a small paperwork task into a costly one.

Related reading

• How to Do a GST Return: NZ IRD Guide, Costs & Penalties
• How to Do a GST Return: Step-by-Step Guide for 2025

Both guides cover the same workflow with a New Zealand focus; the world guide adds the cross-border context.

Frequently asked questions