The National Association of Landlords has estimated that around 440,000 landlords will suffer from the new tax rules restricting the deductions available for finance costs on their properties.
If you follow this link, you will see that this could mean that for some landlords, especially those who spend money on maintaining their properties, the tax they have to pay will be more than the net rental income they receive.
Time will tell whether this has an effect on the quality of the country's housing stock.
http://www.telegraph.co.uk/news/2016/10/18/half-a-million-landlords-will-face-harsher-tax-rules/Nearly half a million landlords will be forced to pay 40pc tax for the first time from April next year, when the Government enforces its planned buy-to-let tax raid, according to analysis. According to the National Association of Landlords, the new harsher tax rules will push the taxable incomes of around a quarter (440,000) of the UK's 2m landlords who currently pay basic rate tax at 20pc, above the higher-rate tax threshold of £41,786. This is despite the profit they make on their investments remaining unchanged.