There are growing warnings about possible rent rises if new legislation goes through.

Inland Revenue figures reveal 40 percent of landlords make rental losses with the average tax benefit being $2000 a year.

Currently, investors can use losses on rental property to reduce the tax they pay on their other income, but the government says that's unfair, especially to first home buyers.

Property Investors Federation executive officer Andrew King joins The Weekend Collective's One Roof Radio Show to discuss the issue.

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