You can’t claim the full mortgage. But if you’re self-employed and work from home, you can claim a portion of the mortgage interest (not the capital repayment) as a business expense.

To calculate your claim:

  1. Area used for business: % of your home used for work.
  2. Time used for business: % of time that area is used for business.

Example:

  • 10% of your home is used exclusively as a home office.
  • You use it full-time for business.
  • You can claim 10% of your annual mortgage interest.

Important:

  • Keep records of mortgage interest and calculations.
  • Claiming a home office may affect Capital Gains Tax (CGT) when selling the home.