Getting your records organised before your accountant starts preparing your annual accounts and tax return can save a lot of unnecessary back-and-forth. For most New Zealand small businesses, our business tax return checklist NZ comes down to making sure your accounting records are reconciled, your income and expenses are complete, your year-end balances can be verified, and any unusual transactions are clearly identified.
The better the information we receive, the easier it is for us to prepare accurate financial statements, calculate your taxable income and identify anything that needs further attention before your return is filed.
This guide explains the documents for a tax return that we generally expect a New Zealand small business to have ready, along with the additional information we may need when preparing year-end accounts.
Quick answer
For a typical New Zealand small business, we recommend having the following ready before starting your annual tax return:
- reconciled business bank accounts
- business credit card statements
- loan and finance statements
- records of all sales and other business income
- supplier invoices and expense receipts
- accounts receivable and accounts payable reports
- details of bad debts
- stock or inventory figures at balance date
- details of assets bought, sold or disposed of
- vehicle expense information
- home office information where applicable
- payroll and employee liability information
- GST records where the business is GST registered
- shareholder drawings and loan information for companies
- details of unusual or one-off transactions
- supporting information for anything that cannot be verified from the accounting system.
Inland Revenue says businesses should retain records covering sales, income, expenses, assets and liabilities, including bank statements, invoices, receipts and credit card information. These records generally need to be retained for at least seven tax years. Inland Revenue’s record-keeping guidance was last updated on 14 May 2026.
What this means for a New Zealand business
Preparing a tax return is not simply a matter of taking the profit shown in Xero or another accounting package and sending that figure to Inland Revenue.
We first need confidence that the underlying information is complete.
For a company, year-end accounting may involve preparing a balance sheet, profit and loss statement, tax adjustments, depreciation calculations and other supporting information. Inland Revenue’s financial reporting requirements vary according to the company’s circumstances, revenue and assets.
If you are operating as a sole trader, partnership, trust, look-through company or another structure, your filing requirements can differ.
For example, active New Zealand resident companies generally file an IR4 company income tax return each year, while look-through companies file an IR7. Inland Revenue’s 2026 company tax return guidance confirms these requirements.
This is why we look beyond simply asking, “What was the profit?”
We also need to ask:
- Are all transactions recorded?
- Are any business expenses mixed with private spending?
- Have assets been treated correctly?
- Is the stock figure correct?
- Do the bank and loan balances reconcile?
- Are customers still owing money?
- Are there unpaid supplier bills?
- Have shareholders taken money from the company?
- Is there anything unusual that happened during the year?
These questions can materially change the final accounts and tax position.
How it works step by step
1. Finish your bookkeeping
Start by making sure all income and expenses for the financial year have been entered.
For businesses with a standard 31 March balance date, this means making sure transactions belonging to the year ending 31 March have been correctly recorded.
Do not assume your bank feed automatically makes the accounts correct. Transactions still need to be correctly coded and reconciled.
2. Reconcile your bank and credit card accounts
Every business bank account and credit card should reconcile to the actual balance at year end.
We may need copies of bank or credit card statements confirming those balances.
If there are old unreconciled transactions sitting in your accounting software, deal with them rather than simply leaving them there.
3. Review money owed to you
Run an aged receivables report and check each outstanding customer balance.
Ask yourself whether the customer genuinely still owes that amount and whether any old invoices may be bad debts.
Do not simply delete an invoice because you believe it will never be paid. The timing and tax treatment of bad debts matters.
4. Review money you owe
Do the same with your accounts payable.
Make sure supplier invoices relating to the year have been entered and check that balances agree with supplier statements where available.
We also want to know about expenses incurred before year end that may not yet have been paid.
5. Complete your stocktake
If your business carries trading stock, determine what was on hand at balance date.
Inland Revenue states that businesses owning trading stock generally need to value it at the end of each income year. Closing trading stock affects taxable income, so this is not a figure we recommend guessing.
6. Review your assets
Tell us about business assets purchased, sold, traded in, written off or otherwise disposed of during the year.
Examples include:
- computers
- machinery
- tools and equipment
- vehicles
- office furniture
- specialist equipment.
Capital assets are generally treated differently from ordinary operating expenses. Inland Revenue states that depreciation is generally claimed on capital assets kept for longer than a year.
There can also be additional rules to consider for qualifying new assets. For example, as at September 2026, Investment Boost allows businesses to claim 20% of the cost of qualifying new assets acquired from 22 May 2025, with depreciation generally applying to the remaining 80%.
7. Give us the information that accounting software cannot tell us
This is often where year-end delays happen.
Your accounting system may show that money moved, but it does not necessarily explain why.
Tell us about:
- new loans
- finance agreements
- asset purchases
- asset sales
- insurance settlements
- grants
- unusual income
- major one-off expenses
- legal settlements
- changes in ownership
- money introduced by shareholders
- significant shareholder drawings.
A short explanation now can save several emails later.
Calculations, records or decisions involved
Some year-end adjustments require more than simply finding an invoice.
Vehicle expenses
If a vehicle is used for both business and private purposes, we need enough information to determine the business portion.
Inland Revenue requires accurate records supporting private and work-related vehicle expenses and business travel.
Home office expenses
If you genuinely use part of your home to generate business income, you may be able to claim an appropriate portion of relevant household expenses.
As at the 2025-2026 tax year, Inland Revenue’s square metre rate is $57.30 per square metre for businesses using that method. The calculation has specific requirements and the rate can change each tax year.
Keep your rates, rent, mortgage-interest and other relevant records rather than trying to reconstruct them months later.
Shareholder drawings
For companies, money taken personally by a shareholder should not simply be treated as another business expense.
A shareholder current account records money introduced to and withdrawn from the company. An overdrawn shareholder current account can have tax consequences, including possible interest, FBT or dividend implications depending on the circumstances.
If you have taken significant drawings or borrowed money from your company, tell us.
Entertainment
Some entertainment expenditure is fully deductible while other expenditure is subject to a 50% limitation, and certain benefits provided to employees can interact with fringe benefit tax rules.
Do not assume that because something was “for business” the entire amount is automatically deductible.
Common mistakes and risks
The most common problems we see at year end are often surprisingly simple.
Missing income
All business income needs to be considered, including income that may have been received outside the normal business bank account.
Mixing personal and business spending
This creates unnecessary work and increases the risk of private expenses being claimed incorrectly.
Not reconciling bank accounts
Your profit and loss report can look perfectly reasonable while the underlying accounts contain errors.
Leaving asset purchases coded as ordinary expenses
Large equipment and other capital purchases may require different tax treatment.
Ignoring old customer balances
Receivables should reflect amounts genuinely owed to the business.
Forgetting stock
For businesses holding significant inventory, an incorrect closing stock figure can affect taxable profit.
Making changes after the accounts have been finalised
Once we have completed your accounts, avoid entering transactions into the closed year without discussing it with us first. Using the lock-date functionality in your accounting software can help prevent accidental changes.
Waiting until the filing deadline
For income tax returns without an extension of time, Inland Revenue’s standard filing deadline is 7 July. Eligible clients of tax agents can receive an extension of time, potentially allowing filing through to 31 March of the following year. Inland Revenue reconfirmed these extension-of-time arrangements in August 2026.
Your actual deadline can depend on your balance date and circumstances, so check rather than assume.
Practical checklist
Before sending your year-end information to us, work through this year end accounts checklist:
- All business bank accounts reconciled
- Credit card accounts reconciled
- Bank statements available
- Loan and finance balances confirmed
- All sales recorded
- All supplier bills entered
- Aged receivables reviewed
- Aged payables reviewed
- Bad debts identified
- Stocktake completed where required
- Fixed asset purchases identified
- Assets sold or disposed of identified
- Vehicle records available
- Home office information available
- Payroll information complete
- Holiday pay and other employee liabilities reviewed
- GST records complete
- Shareholder drawings or loans identified
- Cash on hand confirmed
- Unusual transactions explained
- Supporting invoices and receipts attached or available
- Profit and loss report reviewed for anything unexpected
- Balance sheet reviewed for balances that do not look right.
You do not necessarily need to send every document to Inland Revenue with your return. For example, when completing an IR10 financial statements summary, Inland Revenue states that financial records themselves do not need to be submitted with the form. You still need to retain the underlying records supporting the figures.
When to speak with an accountant or business adviser
We recommend speaking with us before year end, rather than after the tax return is due, if something significant has changed.
That could include:
- buying or selling a business
- purchasing major assets
- taking substantial shareholder drawings
- changing business structure
- bringing in another shareholder
- experiencing a large increase or decrease in profit
- disposing of significant assets
- taking on major borrowing
- having overdue tax
- discovering bookkeeping errors from an earlier year.
Your annual accounts are also useful for more than satisfying Inland Revenue.
They give us an opportunity to look at profitability, cash flow, margins, debt, working capital and how the business has changed from the previous year.
If provisional tax is likely to change because your profitability has moved significantly, identifying that early can also make tax planning easier.
Our Tax Return Services page explains how we help businesses prepare financial statements and tax returns, while our other Tax & IRD guides cover areas such as GST and provisional tax in more detail.
If you are unsure whether your records are complete, you can also contact Humphries Associates before sending everything through. It is generally easier for us to identify what is missing before preparation begins than halfway through finalising your accounts.
Frequently asked questions
What is the short answer for a New Zealand business?
Make sure your accounting records are complete and reconciled, then gather supporting documents for income, expenses, bank accounts, loans, assets, stock, payroll, GST and any unusual transactions. Your exact requirements will depend on your business structure and circumstances.
What records or information will I need?
Typical documents include bank statements, invoices, receipts, credit card statements, loan statements, accounts receivable and payable reports, payroll reports, asset purchase information, stock figures and records supporting vehicle or home office expenses.
Inland Revenue requires businesses to retain relevant tax records for at least seven tax years.
What are the most common mistakes?
Common problems include unreconciled accounts, missing income, personal expenses mixed with business spending, incorrect asset coding, missing stock figures, unexplained shareholder drawings and leaving preparation until close to the filing deadline.
When should I get professional advice?
Talk to us when a transaction is unusual, financially significant or difficult to classify, or when the business has changed materially during the year. Tax treatment depends on the facts, so getting advice before a transaction occurs can sometimes be more useful than trying to resolve it after year end.
Last reviewed: September 2026. This guide provides general information only. Tax treatment depends on your business structure, transactions and individual circumstances.