PHOTO: Landlords claimed more than $41 million for stationery, telephone and postage costs on loss-making investment properties in one year. Photo: iStock

The expenses of landlords who negatively gear investment properties have been revealed in new figures showing property owners collectively spent millions of dollars on gardening, office costs and travel.

The largest deduction in total for loss-making rental properties was interest on loans, at $18 billion during financial 2016-17, according to the most recent Australian Taxation Office statistics.

Capital works cost $2.69 billion in total, followed by plant depreciation ($2.27 billion), council rates ($1.98 billion) and repairs and maintenance ($1.86 billion).

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