Home Office Expense Calculator Template
Calculate the business proportion of home expenses when working from home. HMRC compliant.
File format: .xlsx (Microsoft Excel, Google Sheets, LibreOffice compatible)
Home Office
- All home expense categories
- Room-based or time-based apportionment
- HMRC simplified rates option
- Auto-calculates business proportion
What is a Home Office Expense Calculator?
A Home Office Expense Calculator works out how much of your household costs you can claim as business expenses when you work from home. HMRC allows two methods: a flat-rate simplified amount based on hours worked, or a proportional calculation based on actual bills. This template does both and tells you which is better.
Common use cases:
- Calculating the business portion of rent, mortgage interest, utilities, and council tax
- Deciding between HMRC's simplified rate and actual cost method
- Producing supporting evidence for home office expense claims
- Tracking home office costs year on year
- Ensuring you do not overclaim (which risks HMRC penalties) or underclaim (which costs you money)
When to use this template
- You work from home and want to claim a fair portion of household costs
- You are unsure whether to use HMRC's simplified rate or calculate actual costs
- You want a defensible calculation if HMRC ever asks questions
- You have a dedicated workspace and want to claim its proportional cost
What Your Template Contains
Everything you need, pre-built and ready to use. Just enter your data in the blue cells.
All Home Expense Categories
Covers rent, mortgage interest, utilities (gas, electric, water), council tax, home insurance, broadband, and maintenance.
Room-Based Apportionment
Calculate business use based on the number of rooms used for work vs total rooms in your home.
Time-Based Apportionment
Alternatively, calculate based on hours worked from home per week for more precise claims.
HMRC Simplified Rates Option
Compare the flat-rate method (£10-£26/month depending on hours) against your actual cost calculation.
Auto-Calculates Business Proportion
Enter your total bills and usage percentage — the template calculates exactly what you can claim.
Annual Claim Total
Year-end summary showing total claimable amount, ready for your Self Assessment or company records.
How This Template Helps Your Business
Claim the Maximum, Safely
Many home workers underclaim because they are unsure what is allowed. This template ensures you claim everything HMRC permits — no more, no less.
HMRC-Defensible Calculation
If HMRC asks how you calculated your claim, you have a clear, methodical record. No guesswork, no awkward conversations.
Choose the Best Method
The simplified rate might be £312/year. Actual costs might be £1,200+. The template compares both so you never miss out.
Get Started in Minutes
No accounting knowledge required. Follow these simple steps and you'll be tracking your finances in no time.
Download TemplateDownload the template and open in Excel or Google Sheets
Enter your home details: total rooms, rooms used for business, hours worked per week
Enter your annual household bills: rent/mortgage interest, utilities, council tax, insurance, broadband
The template calculates both the simplified rate AND the actual cost method
Choose whichever method gives the higher (but still reasonable) claim
Use the annual total on your Self Assessment or company expense claim
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Frequently Asked Questions
Quick answers about this template
Ready to Get Started?
Download this free template and take control of your business finances today.
Free download, no email required. Works in Excel and Google Sheets.