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Keeping Records for Tax

🗃 Why Records Matter

Good record keeping is the unglamorous foundation of getting tax right. Whether you are self-employed, run a business, earn rental income, or just want to claim what you are entitled to, the records you keep are what back up the numbers in your return. Inland Revenue can ask you to support your tax position, and without records you may lose deductions, face penalties, or simply pay more than you needed to.

Key Point: If you have a tax obligation beyond simple PAYE, you generally must keep records that support your income and expenses, and keep them for a set number of years (commonly seven years in New Zealand, so check the current requirement). Records can be kept digitally. Good records mean you claim every legitimate deduction, survive any review, and spend far less time stressed at tax time.

Who Needs to Keep Tax Records

  • Self-employed people and contractors.
  • Businesses, including GST-registered ones.
  • Landlords with rental income.
  • Anyone claiming expenses, donation credits, or with investment income to declare.

📋 What to Keep

The aim is to be able to show where every income and expense figure came from. That means keeping the documents behind your numbers, not just the totals.

Record typeExamples
Income recordsInvoices issued, sales records, bank deposits, rental income
Expense recordsReceipts, supplier invoices, expense claims
Bank recordsBusiness account statements, loan statements
GST recordsTax invoices, GST returns and workings
Asset recordsPurchase details and depreciation for business assets
Wage recordsPAYE, payroll, and KiwiSaver records if you employ staff

Tax Invoices and GST

If you are GST registered, valid tax invoices are essential, because they are what let you claim GST on purchases. Keeping them organised as you go is far easier than hunting for them at return time. See our guide on how GST works.

Keep the proof, not just the number: A figure in your return is only as good as the document behind it. If you cannot show a receipt or invoice for a claimed expense, you may not be able to claim it if Inland Revenue asks.

⏳ How Long and How to Store

How Long to Keep Records

Tax records generally need to be kept for a set number of years after the relevant return, commonly seven years in New Zealand. The exact requirement is set by Inland Revenue and can vary by situation, so check the current rule. Keeping records too short a time is a real risk if your return is ever reviewed.

Digital Is Fine, and Easier

You do not have to keep boxes of paper. Records can be kept electronically, and digital storage is usually easier to search, back up, and protect from fading or loss. Many people photograph receipts and use accounting software or a simple folder system.

Capture each receipt or invoice when it happens
Store it digitally in a clear folder or accounting app
Reconcile against your bank records regularly
Back up your records so they cannot be lost
Back it up: If your records are digital, a backup is essential. A lost laptop or a failed phone should never mean lost tax records. A second copy, such as secure cloud storage, protects you.

💡 Building a Simple System

Do It as You Go

The single biggest improvement most people can make is to record things as they happen rather than in a panic at year end. A little and often beats a marathon. Capturing receipts weekly and reconciling monthly turns tax time from a nightmare into a quick check.

  • Separate business and personal: a dedicated business bank account makes records far cleaner.
  • Use software or a consistent folder system: whatever you will actually keep up.
  • Reconcile regularly: match records to bank statements so nothing is missed.
  • Keep everything that supports a number in your return.

The Payoff

Good records do more than keep you compliant. They mean you claim every legitimate deduction, so you do not overpay. They make any Inland Revenue review straightforward. And they give you a clear picture of how your business or finances are actually doing.

Records save money: Poor records cost people real money through missed deductions and lost time. The hours spent on a simple system are repaid many times over in lower tax, fewer penalties, and far less stress.

Estimate your tax with the Income Tax Calculator, and pair good records with our guides on depreciation and GST registration. Final word: keep the documents that support your income and expenses, store them digitally, back them up, and keep them for the required period. Do it as you go, and tax time becomes simple and cheaper. This is general information, not tax advice; check the current record-keeping rules.

🎯 Test Your Knowledge

Quiz on Keeping Records for Tax (20 Questions)

1. Tax records are important because they:
Back up the numbers in your return
Are decorative
Replace your return
Lower the GST rate
2. Without proper records you may:
Lose deductions, face penalties, or pay more than needed
Always get a refund
Pay no tax
Be exempt from returns
3. Tax records generally must be kept for:
A set number of years, commonly seven in New Zealand
One week
Forever with no exceptions
No time at all
4. Who needs to keep tax records?
Self-employed, businesses, landlords, and those claiming expenses
Only large companies
Only retirees
No one
5. The aim of record keeping is to:
Show where every income and expense figure came from
Keep only totals
Hide income
Avoid filing
6. For a GST-registered business, valid tax invoices:
Let you claim GST on purchases
Are optional
Replace the GST return
Are only for customers
7. A figure in your return is:
Only as good as the document behind it
Always accepted
Never checked
Set by the bank
8. Tax records can be kept:
Electronically
Only on paper
Only in your memory
Only by an accountant
9. A key risk of keeping records too short a time is:
Being unable to support a return if it is reviewed
Saving space
Paying less tax
Nothing
10. If your records are digital, you should also:
Back them up
Delete them yearly
Print and burn them
Share them publicly
11. The single biggest record-keeping improvement is to:
Record things as they happen, not at year end
Wait until the last minute
Never record anything
Only record income
12. Separating business and personal money:
Makes records far cleaner
Is illegal
Has no effect
Increases tax
13. Reconciling means:
Matching your records to your bank statements
Deleting old records
Guessing totals
Filing GST
14. Income records include:
Invoices issued, sales records, and rental income
Only receipts
Only your tax code
Nothing
15. Expense records include:
Receipts and supplier invoices
Only your salary
Only bank logos
Nothing
16. If you employ staff, you also keep:
PAYE, payroll, and KiwiSaver records
No records
Only your own receipts
Only GST invoices
17. Good records make an Inland Revenue review:
Straightforward
Impossible to pass
Automatic failure
Unnecessary to respond to
18. Beyond compliance, good records also:
Show how your business or finances are really doing
Hide your profit
Raise your tax
Do nothing useful
19. Poor records typically cost people through:
Missed deductions and lost time
Lower tax
Extra refunds
Free advice
20. The best summary of tax record keeping is:
Keep the documents behind your numbers, store and back them up, and do it as you go
Keep only totals briefly
Rely on memory
Avoid records to save time

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