Home Office Deduction Carryover: Form 8829, Limits, and Records

A home office deduction carryover is the portion of your home office expenses that you couldn’t deduct this year because they exceeded your business’s income limit, and federal tax law lets you push that unused amount forward to future tax years.¹ There is no stated expiration date in the statute, so the balance can roll forward year after year, as long as you keep qualifying for the home office deduction and keep using the actual expense method.² The details are where filers get tripped up.

Why the Carryover Exists

The rule that creates the carryover lives in Section 280A(c)(5) of the Internal Revenue Code. Your home office deductions for the year cannot exceed the gross income your business earns from using that home office.² Congress built this ceiling so a home office can’t create a tax loss that shelters unrelated income like investment gains or a spouse’s wages.

The ceiling isn’t simply your revenue. You first subtract two things from gross income before measuring how much room is left for home-related costs:

The business portion of mortgage interest, property taxes, and casualty losses from federally declared disasters. These come off the top because you could claim them on Schedule A even without a home office.
Business expenses that have nothing to do with the home itself, like advertising, supplies, business phone service, and subcontractor payments.

Whatever is left is your ceiling for home-specific deductions. Everything above that ceiling becomes your carryover.¹

Which Expenses Land in the Carryover

Not every home office expense is treated the same when the income limit bites. The IRS uses a three-tier priority order, and the order determines which expenses get deducted first and which get suspended.

First: Mortgage Interest, Taxes, and Casualty Losses

The business share of mortgage interest, property taxes, and casualty losses from federally declared disasters is deducted first. These have priority because they’d be at least partly deductible on your personal return anyway. If this tier alone consumes the available income, everything below it carries over in full.¹

Second: Operating Expenses

If income remains, you next deduct the business percentage of operating costs: utilities, homeowner’s insurance, repairs, and security system expenses. The business percentage is usually the square footage of your office divided by the total square footage of your home.¹ When the ceiling runs out during this tier, the unused operating expenses become part of your carryover.

Third: Depreciation

Depreciation on the business portion of your home comes last. Residential property is depreciated over 27.5 years using the straight-line method under MACRS.³ Because depreciation sits at the bottom of the stack, it’s frequently the largest slice of a carryover. In a year where the business barely breaks even, expect all of the depreciation and some operating expenses to end up suspended.

Your carryover is the sum of the unused operating expenses and unused depreciation from tiers two and three, and the two amounts stay separated because they get tracked on different lines going forward.

Reporting and Tracking the Carryover on Form 8829

Form 8829 is the form that carries the balance from year to year for sole proprietors. It splits operating expense carryovers from depreciation carryovers and runs the income limit math for you.⁴ On the 2025 Form 8829:

Line 25 is where you enter the operating expense carryover from last year’s Form 8829 (last year’s line 43).
Line 31 is where you enter last year’s depreciation and casualty loss carryover (last year’s line 44).
Line 43 calculates your new operating expense carryover heading into next year.
Line 44 calculates your new depreciation carryover heading into next year.

Whatever the form determines you can absorb this year flows to Schedule C, line 30, and reduces your net business profit.⁵ Anything still above the ceiling recalculates into a fresh carryover on lines 43 and 44 and waits for next year. The cycle repeats until the balance is used up or the qualifying business use ends.

Running two businesses out of the same office? You’ll file a separate Form 8829 for each, and each has its own income limit and its own carryover.¹

What Freezes or Kills the Carryover

The Simplified Method Pauses It

The IRS offers a simplified home office deduction of $5 per square foot, capped at 300 square feet, or $1,500. It’s faster, but it interacts badly with carryovers. The simplified method cannot generate a carryover of its own: if the simplified deduction exceeds your gross income, the excess is lost.⁶ And if you already have a carryover balance from an actual-expense year, you cannot touch it during any year you elect the simplified method. The balance doesn’t disappear, but the clock pauses until you switch back to actual expenses.⁷

You Have to Re-Qualify Each Year

A prior-year carryover is not automatically deductible. You have to qualify for the home office deduction again in the year you want to use it, meaning a space used exclusively and regularly as your principal place of business. If you stopped using the office partway through the year, you can only apply the carryover against income earned during the months you actually maintained the qualifying office.¹ The gross income limit also reapplies every year, so a lean year rolls the balance forward again.

Moving, Selling, or Closing the Business

Moving

Your carryover follows your business, not the old house. The statute lets the carryover apply “whether or not the dwelling unit is used as a residence during such taxable year,” so you can keep using it at a new address as long as the new home office qualifies.² If you move mid-year, you’ll file two Form 8829s that year, one for each property.

Selling the Home

Selling a home you used partly for business is where carryovers hide a real trap. Under the “allowed or allowable” rule, you must reduce your home’s basis by the greater of the depreciation you actually claimed or the depreciation you were entitled to claim.⁸ Depreciation sitting in a carryover you never actually deducted still reduces your basis and can enlarge your taxable gain at sale.

You also cannot exclude the portion of your gain attributable to post-May 6, 1997 depreciation from the Section 121 home sale exclusion, even if that depreciation was stuck in a carryover and never deducted.¹ And if you sell and don’t set up a qualifying office in your next home, the remaining carryover has nothing to attach to and effectively becomes unusable.

Closing the Business

If the business ends and you don’t start another qualifying home business, the unused carryover is lost. There’s no rule that lets suspended home office expenses offset other income like wages or investment gains. The carryover survives only as long as the qualifying business use does.

Keep the Records That Support It

The usual three-year IRS retention window doesn’t work for a carryover. As long as you’re carrying an unused balance, hold onto the records behind it, including every prior-year Form 8829.¹ Depreciation records need to last even longer: your home’s original purchase price, the cost of improvements, and every year’s depreciation calculation should stay in your files for as long as you own the property and for at least three years after you file the return reporting its sale. Because the “allowed or allowable” rule lets the IRS recalculate basis using depreciation you should have taken, those records are what protect you from overpaying when the home eventually sells.⁸

1
Internal Revenue Service. Publication 587 – Business Use of Your Home
2
Office of the Law Revision Counsel. 26 USC 280A – Disallowance of Certain Expenses in Connection With Business Use of Home
3
Internal Revenue Service. Publication 946 – How To Depreciate Property
4
Internal Revenue Service. Instructions for Form 8829
5
Internal Revenue Service. 2025 Instructions for Form 8829
6
Internal Revenue Service. Simplified Option for Home Office Deduction
7
Internal Revenue Service. FAQs – Simplified Method for Home Office Deduction
8
Internal Revenue Service. Depreciation Recapture