Landlord Record Keeping in New Zealand: What to Track, How to Track It, and What IRD Expects

If you own a rental property and feel quietly anxious every time June approaches, you are not alone. Most self-managing landlords are good at collecting rent and considerably less good at keeping track of what they spend. By the end of the tax year, it is easy to find yourself at the kitchen table with a pile of receipts, trying to reconstruct twelve months of expenses from memory and bank statements.

The good news: once you have a system, this is not actually that hard. The annual reconciliation goes from a weekend of dread to an afternoon of mild admin. This guide will show you what records you need to keep, how to organise them, and how to get there.

Why Record Keeping Matters

IRD requires you to keep records for at least seven years. This is not optional. If you are audited, you need to produce documentation for every deduction you have claimed. A bank statement showing a payment is not enough on its own - you need to show what it was for and that it was a legitimate rental expense.

Beyond compliance, good records mean you claim everything you are entitled to. Landlords who track loosely consistently under-claim. Small amounts add up: a $20 filing fee, $45 parking when you visit the property, $38 for a replacement lock. Over a year with multiple properties, these become real money.

The Seven Categories IRD Uses (IR3R)

The IRD rental income return (IR3R) breaks expenses into these categories:

1. Rates
2. Insurance
3. Mortgage interest (subject to deductibility rules)
4. Repairs and maintenance
5. Property management fees
6. Body corporate fees
7. Other expenses

Every expense you track should map to one of these. When you set up your system, use these as your categories from the start. It makes completing the IR3R straightforward because you are already organised the way IRD expects.

What to Track

For income, you need every rent payment received with the date and which tenancy it relates to, any other income from the property (subletting, parking, storage), and bonds received and refunded. Bonds are not income, but they are important to document.

For deductible expenses, the main ones are mortgage interest (currently 80% deductible for properties acquired after 27 March 2021), rates, insurance premiums, body corporate levies, property management fees, repairs and maintenance under $1,000 per item, advertising costs like TradeMe listings, legal fees for tenancy matters (not for buying or selling), accountant fees for the rental return, travel to the property, tribunal application fees, and minor consumables used at the property. IRD's full guidance on rental property deductions covers each category in detail.

Capital expenditure is a separate category and is not immediately deductible. Any single item over $1,000 that improves or extends the life of the property must be depreciated over time. This includes new appliances, replacement carpet, double glazing, and heat pump installations.

The Capital vs Revenue Line

This is where most landlords make mistakes, and it is worth understanding properly.

The core rule: anything that restores something to its original condition is a repair, and you can deduct it now. Anything that improves, upgrades, or extends the life of something beyond what it had originally is a capital improvement, and you depreciate it over time.

The distinction matters in practice. If a refrigerator that normally has a ten-year life breaks in year five, replacing it with an equivalent model at $700 is an expense. You are just restoring what you had. If you replace it with a new fridge that starts a fresh ten-year clock, that is a capital improvement. Under $1,000, IRD permits you to expense it immediately rather than depreciate, which is a useful simplification.

Some concrete examples: fixing a broken window is a repair, but replacing all windows with double glazing over $1,000 is capital. Repainting a room because it is worn is a repair, but adding a new room is capital. Replacing a broken oven element is a repair, but buying a new oven over $1,000 is capital.

If you are unsure, use $1,000 as a practical threshold. Under $1,000, expense it. Over $1,000, talk to your accountant before deciding how to categorise it.

Setting Up Your System

You do not need accounting software to do this well. You need consistency. A spreadsheet is where most self-managing landlords start, and it works perfectly well. The goal is to build a habit you can maintain, not to set up something elaborate you abandon in February.

The simplest system that works starts with a dedicated bank account for the rental property. All rent goes in, all expenses come out. This one change eliminates most of the record-keeping pain because your bank statement becomes a near-complete record.

Alongside that, keep a folder for each property - physical or digital - with subfolders by year. Every receipt, invoice, and statement goes into the relevant year folder when it arrives, not at tax time. Then set up a spreadsheet with the seven IR3R categories as columns, and log each transaction once a month when you reconcile. Done consistently, this takes about fifteen minutes.

For cash expenses, photograph the receipt on your phone immediately. Physical receipts disappear. A photo in a dedicated album takes two seconds and is there when you need it.

What you are building toward is a position where, at the end of June, you open the folder for each property and the information is already organised. You are not reconstructing twelve months from memory. You are just totalling.

Mileage

Vehicle expenses are legitimate but require a log. For each trip related to the property, you need to record the date, start and end point, purpose of the trip (inspection, maintenance visit, tribunal, and so on), and kilometres driven.

IRD's mileage rate for 2025-2026 is $0.97 per kilometre for the first 14,000km. Check IRD's rental property guidance for the current rate as it is updated annually. Alternatively, you can claim a proportion of actual vehicle costs if you keep records of total kilometres driven for the year.

A column in your existing spreadsheet works fine for mileage. The key requirement is contemporaneous recording: writing it down at the time, not trying to remember three months later.

Interest Deductibility in 2026

Currently 80% of mortgage interest is deductible for residential investment properties acquired on or after 27 March 2021. Full 100% deductibility returns from the 2026-2027 tax year. Properties acquired before 27 March 2021 may already have full deductibility.

You need to record the total interest paid across the year. Your annual loan statement from the bank shows this figure. Apply the relevant percentage when completing the IR3R.

What IRD Actually Checks

IRD audits of rental returns tend to focus on expenses claimed for the private-use portion of a property if you use part of it yourself, capital items claimed as repairs, interest deductibility calculations, vehicle expenses without a log, and cash expenses without receipts.

The audit risk is not high for straightforward residential rentals with clean records. But when it happens, the process is much easier if your records are complete and your categories are consistent from the start.

The Simple Answer to Most Tax Questions

Keep receipts for everything. Use the IR3R categories from day one. Reconcile monthly. Get an accountant to review your first return if you are unsure how to categorise anything.

Most rental property tax is not complicated. The traps are not knowing about the capital vs revenue distinction, not tracking the small stuff, and not logging mileage. All of those are fixable with a bit of upfront setup and ten minutes of monthly habit.

Skip Building the Spreadsheet From Scratch

I built RentManager NZ partly because I was doing exactly what this guide describes - managing four Auckland CBD apartments from a spreadsheet and a shoebox of receipts. After a few tax years of reconstructing expenses from bank statements, I decided there had to be a better way.

RentManager NZ handles the rent tracking and expense categories for you, with your transactions automatically matched to tenancies. The IR3R categories are built in. You still need to photograph receipts and keep your mileage log, but the monthly reconciliation happens automatically.