Free Home Office Deduction Calculator

The measurement is the easy half. The rule underneath it is that the space is used regularly and exclusively for the business, and exclusivity is where a spare room usually gives way: a desk under the window, a sofa bed for visitors over the holidays, and the square footage behind the deduction is doing two jobs. Nothing on this screen can see that. It divides 120 square feet by 1,500, applies the result to whatever expenses you typed, and hands back the same 8% for a room that fails the test as for a room that passes.

The simplified method wins on administration before it wins on anything else. Five dollars a square foot on up to 300 square feet is one line, no receipts to file, no depreciation schedule to keep, and a ceiling of $1,500. The standing cost of that choice is the gap it leaves each year. On the same 120 square feet the simplified figure is $600, while 8% of $28,500 in rent, utilities, internet, insurance and repairs comes to $2,280. Trading the paperwork for $1,680 is a fair call once. Repeated quietly across six years it is $10,080.

The simplified method has a real argument behind it, worth stating properly. For an owner it skips depreciation, so there is no depreciation to recapture as gain when the house is sold, and that can outweigh several years of a larger annual deduction. Where it turns is a thin year. Both methods stop at the gross income from the business use of the home, and the amount the simplified method cannot use is gone, while the regular method carries the unused part forward to a year with income to absorb it. Form 8829 is the price of that carryforward.