Bright-line losses: how they are ring-fenced and carried forward

If you sell within the bright-line period for less than the property cost you, you have a bright-line loss, and it is ring-fenced. Inland Revenue says it can only be offset against bright-line profits or other taxable land sale income, in the same year or carried forward to a later one. It cannot reduce your salary, wages, rental income or business income, and you do not put it in your tax return: you keep your own record. Separately, residential rental deductions have their own ring-fence, and a taxable bright-line gain is one of the few things that can unlock them. Rules checked 10 November 2026.

What counts as a bright-line loss

A bright-line loss is worked out the same way as a gain. Take the sale price, then subtract the purchase price, purchase costs, capital improvements, selling costs and any deductible holding costs. If the answer is negative, that is the loss. Our deductible costs guide goes through each item.

The sale must still be caught by the bright-line test for the loss to exist for tax. If the sale agreement was signed more than 2 years after title transferred to you (for sale agreements on or after 1 July 2024), or an exclusion such as the main home exclusion applies, there is no bright-line gain and no bright-line loss either. Selling your own home at a loss does not give you a tax loss.

Agent commission is a common reason a quick sale ends in a loss. A property that sells for a little more than you paid can still show a loss once the agent, lawyers and purchase costs are taken off.

How the ring-fence works

Inland Revenue's guide IR1229 (March 2026, pages 46 to 47) sets out the rules:

Three other points from IR1229:

• Do not put the loss in your return. Keep your own record of it, with the workings, so you can use it when a taxable land sale comes along.
• Trusts cannot pass the loss on. A trust's bright-line loss cannot be distributed to beneficiaries; it stays in the trust.
• Companies need continuity. A company can carry a bright-line loss forward only if it meets the ownership continuity test.

"Other taxable land sale income" includes land taxed because it was bought with an intention of selling it (section CB 6), which has no time limit. Our intention test guide explains when that applies.

IRD's example: Zac

IR1229 (page 47) uses Zac to show the ring-fence. In August 2024 Zac makes a bright-line loss of $60,000. He earns a salary of $80,000, but the loss cannot reduce it, so Zac pays full tax on his salary that year and carries the loss forward.

In July 2025 Zac sells other land at a $100,000 profit that is taxable because he bought it with the intention of selling. The carried-forward loss is offset against it, and only $40,000 of land income is taxed.

The loss did not disappear; it simply waited until there was land income for it to reduce.

Worked example: carrying a loss forward

Wiremu buys a townhouse for $690,000, paying $2,800 in legal fees. Plans change, and he signs an agreement to sell within 2 years for $655,000, settling in February 2026, in the 2025/26 income year. The agent and lawyer cost $21,000. His salary is $95,000.

Wiremu's $95,000 salary is taxed in full for 2025/26. The $58,800 loss goes in his own records, not his return.

In November 2026 he sells a second property, also inside the bright-line period. It cost $610,000 plus $3,000 in purchase costs and sells for $720,000, with $22,000 of selling costs. Run through this site's engine with 2026/27 rates and his $95,000 salary:

The carried-forward loss saves Wiremu $19,404.00 in 2026/27. If the second gain had been only $40,000, the loss would wipe it out completely, with no tax on that sale, and $18,800 of loss would still be waiting for the next taxable land sale.

The bright-line tax calculator shows when a sale ends in a loss; keep that result with your records.

The link with residential rental loss ring-fencing

There is a second, separate ring-fence that catches many of the same people. Since the 2019/20 year, residential rental deductions cannot be more than your residential income for the year. Inland Revenue's rental income guide (IR264, March 2026, pages 35 to 39) sets out how it works:

• Excess rental deductions are carried forward to a future year with residential income. They cannot reduce salary or business income in the meantime.
• You choose a portfolio basis (all your residential rentals together) or an individual property basis. Once on the portfolio basis, you cannot switch back.
• Main homes, mixed-use holiday homes and certain employee accommodation are outside these rules.

Here is where the two ring-fences meet. A taxable sale of a rental, including a bright-line sale, counts as residential income. IRD's Minerva example, on a portfolio basis, has rent of $30,000, a taxable sale with a net gain of $20,000 and deductions of $35,000: her net residential income is $15,000. If the sale had not been taxable, her residential income would have been the rent alone, her net income $0, and $5,000 of deductions carried forward.

A taxable sale can also release excess deductions against your other income. That happens when you sell an individual property, or the last property in a portfolio where every sale was taxable. In IRD's Jairus example, the final portfolio sale gives a $10,000 gain plus $20,000 of rent, against $35,000 of deductions: $30,000 is used, and the remaining $5,000 is released against his salary.

So the two rules work in opposite directions. A bright-line loss is locked away and can only reduce land sale income. A bright-line gain on a rental can soak up rental deductions that were locked away. If you have both rental losses carried forward and a bright-line sale coming, the order and basis matter, and that is one for your accountant. Our selling a rental guide covers the rest of the sale.

One more historical point: IR264 notes that interest denied under the interest limitation rules, which ran from 1 October 2021 to 31 March 2025, is added to the cost when the property is sold in a taxable bright-line sale. That can turn a small gain into a smaller one, or into a loss.

Keeping a record of the loss

Because the loss stays out of your return, Inland Revenue holds no record of it. If you sell again in five years, you will need to prove the loss yourself. Keep:

1. The workings: sale price, every cost, and the final loss.
2. The sale and purchase agreements and both settlement statements.
3. Invoices for improvements and selling costs.
4. A running note of how much of the loss has been used, and in which year.

This is a guide, not tax advice. Losses in trusts and companies, and the interaction with rental ring-fencing, can be complex, so check with your accountant for your situation.

Questions people ask

Can I claim a bright-line loss against my salary?

No. A bright-line loss can only reduce bright-line profits or other taxable land sale income. It cannot reduce salary, wages, rental or business income.

Do I put a bright-line loss in my tax return?

No. IRD says to keep your own record of the loss and use it when you have a bright-line profit or other taxable land sale income, in the same year or a later one.

How long can I carry a bright-line loss forward?

IR1229 says an individual carries the loss forward to use against later taxable land sale income, and we have not seen an expiry date in IRD's guidance. Companies must meet the ownership continuity test.

Does a bright-line gain affect my rental loss carry-forward?

It can. A taxable sale of a rental counts as residential income, so excess rental deductions can reduce it, and a final taxable sale can release remaining deductions against other income.