Deductions & credits
You can see the amounts you used for the Cost Basis of your home on Form 8829, Asset Entry Worksheet from the first year you claimed a Home Office. Use the same amounts from year to year, if TurboTax is not carrying the Asset Info over for you each year (it should).
If you change the amounts every year, your depreciation amounts will be off, which you will need whenever you sell your home. Form 4562 shows depreciation each year.
