Form 8829 2021

Expenses for Business Use of Your Home

Department of the Treasury 

Internal Revenue Service (99) 

▶ File only with Schedule C (Form 1040). Use a separate Form 8829 for each 

home you used for business during the year.

▶ Go to www.irs.gov/Form8829 for instructions and the latest information.

OMB No. 1545-0074

Attachment 

Sequence No. 176

Name(s) of proprietor(s) Your social security number 

Part I Part of Your Home Used for Business 

1 Area used regularly and exclusively for business, regularly for daycare, or for storage of inventory 

or product samples (see instructions) . . . . . . . . . . . . . . . . . . . . 1 

2 Total area of home . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 

3 Divide line 1 by line 2. Enter the result as a percentage . . . . . . . . . . . . . . . 3 % 

For daycare facilities not used exclusively for business, go to line 4. All others, go to line 7. 

4 Multiply days used for daycare during year by hours used per day . . 4 hr.

5 If you started or stopped using your home for daycare during the year, 

see instructions; otherwise, enter 8,760 . . . . . . . . . . . 5 hr.

6 Divide line 4 by line 5. Enter the result as a decimal amount . . . . 6 . 

7 Business percentage. For daycare facilities not used exclusively for business, multiply line 6 by 

line 3 (enter the result as a percentage). All others, enter the amount from line 3 . . . . . ▶ 7 % 

Part II Figure Your Allowable Deduction 

8 Enter the amount from Schedule C, line 29, plus any gain derived from the business use of your home, 

minus any loss from the trade or business not derived from the business use of your home. See instructions. 8 

See instructions for columns (a) and (b) before completing lines 9–22. (a) Direct expenses (b) Indirect expenses

9 Casualty losses (see instructions) . . . . . . 9 

10 Deductible mortgage interest (see instructions) . 10 

11 Real estate taxes (see instructions) . . . . . 11 

12 Add lines 9, 10, and 11 . . . . . . . . . 12 

13 Multiply line 12, column (b), by line 7 . . . . . . . . . . . . 13 

14 Add line 12, column (a), and line 13 . . . . . . . . . . . . . . . . . . . . . 14 

15 Subtract line 14 from line 8. If zero or less, enter -0- . . . . . . . . . . . . . . . . 15 

16 Excess mortgage interest (see instructions) . . 16 

17 Excess real estate taxes (see instructions) . . . 17 

18 Insurance . . . . . . . . . . . . . . 18

19 Rent . . . . . . . . . . . . . . . 19

20 Repairs and maintenance . . . . . . . . 20

21 Utilities . . . . . . . . . . . . . . 21

22 Other expenses (see instructions) . . . . . . 22

23 Add lines 16 through 22 . . . . . . . . . 23

24 Multiply line 23, column (b), by line 7 . . . . . . . . . . . . 24

25 Carryover of prior year operating expenses (see instructions) . . . . 25

26 Add line 23, column (a), line 24, and line 25 . . . . . . . . . . . . . . . . . . . 26

27 Allowable operating expenses. Enter the smaller of line 15 or line 26 . . . . . . . . . . 27

28 Limit on excess casualty losses and depreciation. Subtract line 27 from line 15 . . . . . . . 28

29 Excess casualty losses (see instructions) . . . . . . . . . . 29

30 Depreciation of your home from line 42 below . . . . . . . . . 30

31 Carryover of prior year excess casualty losses and depreciation (see instructions) 31

32 Add lines 29 through 31 . . . . . . . . . . . . . . . . . . . . . . . . . 32

33 Allowable excess casualty losses and depreciation. Enter the smaller of line 28 or line 32 . . . 33

34 Add lines 14, 27, and 33 . . . . . . . . . . . . . . . . . . . . . . . . . 34

35 Casualty loss portion, if any, from lines 14 and 33. Carry amount to Form 4684. See instructions . 35

36 Allowable expenses for business use of your home. Subtract line 35 from line 34. Enter here

and on Schedule C, line 30. If your home was used for more than one business, see instructions. ▶ 36

Part III Depreciation of Your Home 

37 Enter the smaller of your home’s adjusted basis or its fair market value. See instructions . . . 37

38 Value of land included on line 37 . . . . . . . . . . . . . . . . . . . . . . 38

39 Basis of building. Subtract line 38 from line 37 . . . . . . . . . . . . . . . . . 39

40 Business basis of building. Multiply line 39 by line 7 . . . . . . . . . . . . . . . . 40

41 Depreciation percentage (see instructions) . . . . . . . . . . . . . . . . . . . 41 % 

42 Depreciation allowable (see instructions). Multiply line 40 by line 41. Enter here and on line 30 above 42

Part IV Carryover of Unallowed Expenses to 2022

43 Operating expenses. Subtract line 27 from line 26. If less than zero, enter -0- . . . . . . . 43

44 Excess casualty losses and depreciation. Subtract line 33 from line 32. If less than zero, enter -0- . 44

For Paperwork Reduction Act Notice, see your tax return instructions. Cat. No. 13232M Form 8829 (2021)