•The deduction period depends on the type of home and the year you moved in (13 years at most). For an 'other' home - one that is neither a certified home, a ZEH-level energy-saving home, nor an energy-standard-compliant home - occupied between 2024 and 2030, the period is in principle 0 years. Only homes that received building confirmation by December 31, 2023 or were built by June 30, 2024 qualify, for 10 years with a maximum credit of 140,000 yen a year
•The deduction is not available in any year your total income exceeds ¥20 million
•The home must have a floor area of at least 50 square metres, judged by the figure on the certificate of registered matters, with at least half of it used solely as your own residence. Homes of 40 to under 50 square metres also qualify, but only if your total income is 10 million yen or less
•Conditions differ for pre-owned homes and renovations — check the NTA website for details
•Don't forget the year-end adjustment procedure from year 2 onward — your employer will ask for the balance certificate each October–November
•You must move in within 6 months of the home being built or acquired and still be living there on December 31 of each year you claim. The loan must be repayable over 10 years or more, and loans from relatives or friends do not qualify