Home Office Deduction Worksheet

If you use part of your home regularly and exclusively for business, you may be eligible for a home office deduction — but calculating it correctly requires the right square footage math and expense allocation. This worksheet walks through both.

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Who this is for

Self-employed individuals and freelancers working from a home office
Small business owners with a dedicated home workspace
Anyone unsure whether their home office qualifies for the deduction
Business owners wanting to maximize a legitimate deduction with proper documentation

What's included

Home office and total home square footage inputs
Automatic business-use percentage calculation
Home expense allocation (utilities, insurance, mortgage interest/rent) applied to that percentage
Built-in AI prompt to review whether your setup likely qualifies

Why use a template instead of starting from scratch?

The home office deduction has specific eligibility rules — regular and exclusive business use — and the calculation itself requires accurately allocating a percentage of shared home expenses. Getting either piece wrong either costs you a legitimate deduction or creates risk if the space doesn’t actually qualify.

How to Use This Template

Download and open in Excel or Google Sheets

Requires a Tools Club membership — log in first to access the file.

Measure your home office and total home square footage

This is the basis for the business-use percentage calculation.

Enter your home expenses for the year

Utilities, insurance, and mortgage interest or rent are commonly included.

Review the automatic deduction calculation

This applies your business-use percentage to the relevant home expenses.

Run the built-in AI prompt to review eligibility

Attach the saved file to ChatGPT or Claude and ask whether your setup sounds like it meets the general eligibility criteria — then confirm with a tax professional.

Built-in AI prompt

Once you've filled this template in, it includes a ready-to-use prompt at the bottom of the sheet. Attach your saved file to ChatGPT, Claude, or any AI chat tool and paste it in — you'll get plain-English feedback on whether your home office setup sounds like it meets typical eligibility criteria for the deduction, and what to confirm with a tax professional, no accounting background required.

Common Mistakes to Avoid

Claiming a space that isn’t used exclusively for business

A room used for both business and significant personal purposes generally doesn’t qualify — the space needs to meet the regular and exclusive use standard.

Measuring square footage inaccurately

The business-use percentage calculation depends directly on accurate measurements — remeasure rather than estimating.

Forgetting to include all eligible shared expenses

Utilities, insurance, and other shared home costs are often only partially remembered — a complete list produces a more accurate deduction.

Not choosing between the simplified and regular method deliberately

Tax authorities in some jurisdictions offer both a simplified flat-rate method and a detailed actual-expense method — compare both rather than defaulting to one without checking.

Frequently Asked Questions

What are the eligibility requirements for a home office deduction?

Generally, the space needs to be used regularly and exclusively for business — rules and specific requirements vary by jurisdiction, so confirm current requirements with a tax professional.

What’s the difference between the simplified and regular method?

A simplified method often uses a flat rate per square foot up to a maximum, while a regular/detailed method calculates actual home expenses times your business-use percentage — the better option depends on your specific expenses, so compare both.

Can renters claim a home office deduction?

Often yes, using a portion of rent and shared utilities rather than mortgage interest — but eligibility rules still apply the same regardless of owning or renting.

Is this included in the free plan?

No, this is a Tools Club template. iLuvAccounting also has a free Business Tax Deduction Tracker for your other deductible expenses.

Does claiming a home office deduction increase audit risk?

A properly documented, legitimate home office deduction is a normal and common claim — the key is genuine eligibility and accurate calculation, supported by documentation like this worksheet.

Can I claim a home office deduction if I’m also an employee somewhere else?

Rules vary by jurisdiction and by employment status (self-employed vs. employee) — check current guidance, since employee home office deductions have historically been treated differently than self-employed ones in some jurisdictions.

Is there a Canada-specific version of this worksheet?

Yes — iLuvAccounting has a Work-Space-in-Home Expense Worksheet (Canada) reflecting CRA-specific rules.

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