Home Office Deduction Calculator 2026: $5/sq ft

What does this calculator answer?

You get two 2026 home office deduction estimates for the same square footage and costs: the IRS simplified method and an actual-expense allocation. Each result is limited by the business income you enter. The larger allowed amount is shown first, with which method wins and by how many dollars.

The calculator does not determine whether your space qualifies.

Is this a home office deduction calculator?

Yes. This page is the Numerandi home office deduction calculator for 2026. It is also the simplified vs actual comparison.

The headline result is the larger allowed deduction. Supporting lines show the simplified amount, the actual-expense estimate, and your business-use percentage. Use this page when you have a dedicated workspace and want a quick comparison before you choose the simplified option or Form 8829 detail.

If you still need who qualifies, what counts as a write-off, and why W-2 rules differ, read what you can write off working from home. That article owns eligibility and categories. This tool owns the simplified-versus-actual estimate.

What should you enter?

Use office square feet used only for work: the area used regularly and exclusively for qualifying business activity. Measure the defined space. A dining table your family also uses usually fails exclusive use.

Use total home square feet on the same measurement basis, typically finished living space. Business use is office square feet divided by this home area, capped at 100%.

Use net business profit before this deduction: profit that can absorb a home office deduction, not gross client payments and not the cash you transferred to yourself. Each method is limited to this amount.

Open actual-method expenses to enter eligible whole-home costs such as rent, utilities, and insurance, plus office-only costs that apply only to the workspace. Do not enter furniture, equipment, or the business share of phone or internet as a whole-home cost. Those items often follow other deduction rules.

How does the calculation work?

The simplified estimate is $5 times qualifying square feet, capped at 300 square feet, then limited by net business income before the deduction. The actual estimate adds direct office-only costs to the business-use share of whole-home costs. Business use is office square feet divided by total home square feet, capped at 100%. Each path is limited to your entered income; the calculator surfaces the larger allowed estimate.

Each displayed number also shows its formula. The 2026 simplified rate, square-foot cap, and $1,500 pre-income-limit maximum in the comparison panel come from the same registry as the 2026 self-employment tax figures.

What does exclusive use mean?

Exclusive use means you use the space only for qualifying business activity. A spare room used only for client work can meet that test. A desk in a family room that is also used for television and homework usually does not.

Regular use means recurring business use, not occasional inbox-clearing. The space also needs a qualifying business purpose. Common tests are a principal place of business, a place you meet patients or clients in the normal course of business, or a separate structure.

Check those facts before you trust the math. This calculator accepts the square footage and costs you enter. It does not test exclusive use, regular use, or business purpose.

Read IRS Publication 587, Business Use of Your Home and the IRS home office deduction guidance before you put a result on a return.

What is simplified vs actual?

The simplified method multiplies qualifying office square feet by the IRS simplified rate, up to the square-foot cap, then applies your business-income limit. For 2026, that is $5 per square foot for up to 300 square feet, so the maximum before the income limit is $1,500. This standard amount is not indexed each year. See the IRS simplified option for home office deduction and Revenue Procedure 2013-13.

The actual-expense method adds office-only costs to the business-use share of eligible whole-home costs. Square footage is the allocation this tool uses. A direct office repair may be fully allocable. Whole-home rent, utilities, and insurance are generally multiplied by the business-use percentage.

The simplified method is usually faster when your dedicated area is small or your whole-home costs are modest. Actual expenses can win when housing costs are high, when your business-use share of a larger home is meaningful, or when direct office-only costs add up.

Form 8829 ordering is more detailed. Direct and indirect expenses, casualty losses, otherwise-deductible mortgage interest and taxes, depreciation, prior carryovers, and the gross income limit do not all work the same way. Use this result to decide whether the method with more records deserves a full 2026 Form 8829 calculation.

A deduction can reduce qualifying business income. It is not a credit and does not repay your cost dollar for dollar.

How does a worked 2026 example look?

As a freelance designer, you use 150 square feet of a 1,200-square-foot apartment only for work. Your business use is 150 ÷ 1,200 = 12.5%. Your entered annual rent, utilities, renter's insurance, and eligible whole-home costs total $24,000. A $500 repair is only for the office. Your available business profit before the home office deduction is $50,000.

Your simplified estimate is 150 × $5 = $750. Your actual estimate is $24,000 × 12.5% + $500 = $3,500. Both are under your entered $50,000 income limit, so the calculator shows the $3,500 actual-expense estimate first. Actual expenses win by $2,750 on these inputs. This does not mean every entered dollar belongs on Form 8829. You must classify your costs, keep proof, and confirm eligibility.

Do daycare or inventory storage change exclusive use?

Publication 587 describes limited exceptions to exclusive use. Certain inventory or product-sample storage and certain daycare facilities can qualify under their own tests even when the space is not used exclusively for business.

Those exceptions are not a free pass to count a shared kitchen or guest room. They have separate conditions. This calculator does not apply a daycare-hour test, a storage-use test, or any other exception. It does not change your entered square footage to match those rules.

If your facts involve daycare, inventory, or a mixed-use room, stop at Publication 587 and the Form 8829 instructions. Do not treat a larger number on this screen as proof that an exception applies.

What does this calculator not calculate?

This tool answers only a limited 2026 simplified-versus-actual estimate from the square footage and costs you enter. It does not calculate:

• Whether your space meets regular use, exclusive use, or a qualifying business purpose
• Daycare, inventory-storage, or other exclusive-use exceptions
• Depreciation, basis, land value, placed-in-service date, or later recapture
• Casualty losses or the otherwise-deductible mortgage-interest and tax split
• A complete Form 8829 order of limitations or official actual-method carryover
• Income-tax or self-employment-tax savings from the deduction
• State home-office rules
• A federal home office deduction for a W-2 employee

If you own the home and use the actual method, collect records for basis, land value, mortgage interest, property tax, insurance, repairs, and the date you first used the space for business. Enter a depreciation amount only after you compute it correctly.

If you need payroll tax on remaining profit, use the 2026 self-employment tax calculator. If you need another method comparison, use the mileage vs actual expense calculator.

Which mistakes can make your result look safer than it is?

• If you count shared space as exclusive business space, you can invalidate the premise.
• If you enter a full home cost and the same cost as direct, you count it twice.
• If you treat furniture, equipment, or internet as an indirect home cost, you can mix deductions governed by different rules.
• If you forget the business-income limit, a large theoretical amount can become a smaller current deduction. Actual-method carryover treatment needs the form.
• If you ignore inconvenient depreciation, your actual-method homeowner comparison can be incomplete and hide later recapture consequences.
• If you treat the larger estimate as cash coming back, you confuse a deduction with a refund.

When should you use this calculator?

Use it when you have a dedicated workspace and want a quick 2026 simplified vs actual comparison before you choose the simplified option or Form 8829 detail. If you still need who qualifies and which home-working costs are ordinary business expenses, read what you can write off working from home. Estimate payroll tax on remaining profit with the 2026 self-employment tax calculator. Compare vehicle deductions with the mileage vs actual expense calculator. Adjust payment planning after a supportable deduction with the 2026 quarterly estimated tax calculator.

What should you do next?

Measure your dedicated space and save a photo or floor plan. Separate your direct office costs from your whole-home costs. If you rent, keep your lease and payment records. If you own, collect records for basis, land value, mortgage interest, property tax, insurance, repairs, and the placed-in-service date, which is when you first used the space for business. Run the official form both ways before filing. If the actual method wins only slightly, weigh the extra records and depreciation consequences. Do not automatically choose the larger number on the screen.