Taking on Flatmates: Financial and Legal Aspects for NZ Homeowners

For many homeowners, particularly those who have recently purchased or are managing tight budgets, taking on a flatmate or boarder offers a practical way to generate income. A spare room sitting empty costs nothing to keep, but it earns nothing either. Renting it out can contribute hundreds of dollars weekly toward your mortgage, rates, or other expenses.

The good news is that having boarders in your owner-occupied home is relatively straightforward from a legal perspective, and the tax treatment is generous compared to standard rental income. But there are still rules to understand and practical matters to address before advertising that spare room.

Understanding the Legal Framework

When you rent out a room in your home while continuing to live there, the person who moves in is generally classified as a "boarder" rather than a "tenant." This distinction matters enormously because the Residential Tenancies Act does not apply to boarder arrangements in the same way.

The key test is whether you continue to live in the property as your principal place of residence and share common areas with your flatmate. If so, your flatmate is a boarder, and you have considerably more flexibility in managing the arrangement.

For boarder arrangements, you can generally give reasonable notice to end the arrangement without needing specific grounds. Bond money does not need to be lodged with Tenancy Services. The formal processes that apply to standard tenancies are relaxed.

However, this does not mean you can treat flatmates unfairly. Basic contractual principles still apply, and acting in bad faith can still land you in trouble, just through different legal channels.

Tax Treatment of Boarder Income

Here is where having flatmates becomes particularly attractive. IRD recognises that providing board often involves services like meals, laundry, and utilities, not just accommodation. To simplify record-keeping, they offer the "standard-cost method" for taxing boarder income.

Under this method, you can receive up to a specified weekly amount per boarder without paying tax on it. As of recent tax years, this has been around $220 per week for an adult boarder receiving accommodation and some meals, or around $180 for accommodation only. Check the current IRD rates as these adjust periodically.

If you charge more than the standard cost, you must declare the excess as income and can claim actual expenses. For most homeowners charging typical market rates, the standard-cost method will cover your situation, making tax compliance minimal.

Creating a Flatmate Agreement

While a written agreement is not legally required for boarders, having one prevents the majority of flatting disputes. It does not need to be lengthy or legalistic; a simple document covering the key points is sufficient.

The conversation required to create this agreement is as valuable as the document itself. It forces both parties to discuss expectations before moving in, surfacing potential conflicts early when they can still be easily resolved or the arrangement reconsidered.

Insurance and Mortgage Considerations

Before your flatmate moves in, notify your home and contents insurer. Having boarders may affect your policy, and failing to disclose this could void your cover. Most insurers accommodate boarders without issue, but some may adjust your premium or add conditions.

Similarly, check your mortgage terms. Some loan agreements require lender consent for any rental activity. While enforcement is uncommon for owner-occupied situations with a boarder or two, technically you may be breaching your loan conditions. A quick call to your lender provides peace of mind.

Setting the Right Rent

Research comparable rooms in your area using platforms like Trade Me, Facebook Marketplace, and local community boards. Consider what is included: a room with ensuite, private bathroom access, or exclusive parking is worth more than a basic room with shared facilities.

Think about what services you will provide. If utilities are included, factor that into the rent. If you are providing internet, laundry access, or occasional meals, account for these costs. Being clear about inclusions prevents disagreements later.

It is generally better to set rent slightly below market and attract quality flatmates than to maximise income and deal with problems. A reliable flatmate who pays on time and respects your home is worth far more than an extra $20 per week from someone who causes stress.

Making the Arrangement Work

Successful flatting arrangements in owner-occupied homes require a particular balance. You are the homeowner, but your flatmate is not a guest who can be asked to leave on a whim. You are sharing your home, but it remains your home.

Establish boundaries early. Be clear about shared spaces and private areas. Discuss how common areas will be maintained and how issues should be raised. Regular, casual check-ins help surface small problems before they become major conflicts.

Remember that finding the right flatmate may take time. It is far better to wait for someone who feels like a good fit than to rush into an arrangement that makes you uncomfortable in your own home. Trust your instincts during the selection process; you will be sharing your living space with this person.