Detailed phasing example of new tax system


The below example details how the phasing of the new tax system over a four year period (2017/18 to 2021/22) could affect a landlord’s net profit when compared to the previous tax system.

All figures used are for illustrative purposes only. From April 2017, the income tax payable in Scotland differs from England and Wales. This example assumes a main residency of England/Wales.


Previous system (16/17)New system (20/21)
Mortgage interest and other allowable costs can be deducted before calculating taxable profit Mortgage interest can’t be deducted before calculating taxable profit
Rental income£10,000 Rental Income£10,000
Mortgage£5,000 Costs£2,000
Costs£2,000 Taxable Income£8,000
Taxable income£3,000 Tax @ 40%£3,200
Tax due (40%)£1,200 Mortgage Interest Relief (20%)£1,000
Buy to Let profit£1,800 Tax Due£2,200
  Buy to Let Profit£800

Broken down year by year, the impact of the phased introduction of the new system for this example is as follows:

Current 40% tax payer Old System New System Buy to Let Tax Bill Net Profit
16/17 100% 0% £1,200 £1,800
17/1875%25%£1,450£1,550
18/1950%50%£1,700£1,300
19/2025%75%£1,950£1,050
20/210%100%£2,200£800

Download and share our tax relief changes calculator to help you and your clients understand how their profits could be affected by the new tax system.