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Keeping Records for Tax

Step 12 of 12 in the pathway Understanding your tax

Previous: When a side income becomes taxable

🗃 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.

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📋 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 type	Examples
Income records	Invoices issued, sales records, bank deposits, rental income
Expense records	Receipts, supplier invoices, expense claims
Bank records	Business account statements, loan statements
GST records	Tax invoices, GST returns and workings
Asset records	Purchase details and depreciation for business assets
Wage records	PAYE, 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:

Always get a refund

Pay no tax

Lose deductions, face penalties, or pay more than needed

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?

Only large companies

Self-employed, businesses, landlords, and those claiming expenses

Only retirees

No one

5. The aim of record keeping is to:

Keep only totals

Hide income

Avoid filing

Show where every income and expense figure came from

6. For a GST-registered business, valid tax invoices:

Are optional

Replace the GST return

Are only for customers

Let you claim GST on purchases

7. A figure in your return is:

Always accepted

Never checked

Set by the bank

Only as good as the document behind it

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:

Saving space

Being unable to support a return if it is reviewed

Paying less tax

Nothing

10. If your records are digital, you should also:

Delete them yearly

Back them up

Print and burn them

Share them publicly

11. The single biggest record-keeping improvement is to:

Wait until the last minute

Never record anything

Record things as they happen, not at year end

Only record income

12. Separating business and personal money:

Is illegal

Has no effect

Makes records far cleaner

Increases tax

13. For tax record keeping, reconciling means:

Deleting old records

Guessing totals

Matching your records to your bank statements

Filing GST

14. Income records include:

Invoices issued, sales records, and rental income

Only receipts

Only your tax code

Nothing

15. Expense records include:

Only your salary

Receipts and supplier invoices

Only bank logos

Nothing

16. If you employ staff, you also keep:

No records

Only your own receipts

PAYE, payroll, and KiwiSaver records

Only GST invoices

17. Good records make an Inland Revenue review:

Impossible to pass

Straightforward

Automatic failure

Unnecessary to respond to

18. Beyond compliance, good records also:

Hide your profit

Raise your tax

Do nothing useful

Show how your business or finances are really doing

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 only totals briefly

Rely on memory

Avoid records to save time

Keep the documents behind your numbers, store and back them up, and do it as you go

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