Can I claim a home office deduction on my downpayment when buying my first house?
I'm planning to buy my first home sometime in 2025, and I've been working from home for my job for the past couple years. I currently deduct my home office on my taxes since I rent, but I'm wondering how this works when purchasing a house. Would I be able to deduct a portion of my downpayment based on the percentage of square footage that will be my dedicated home office? I'm looking at homes around 1,800 sq ft and my office would be about 180 sq ft, so roughly 10%. Also, I'm a bit confused about how the mortgage deduction works with a home office. When I'm deducting part of my mortgage for the office space, am I deducting a percentage of just the interest, or can I deduct that same percentage of the principal payments too? Or is it a percentage of the total mortgage payment? Thanks for any clarification on this! I want to make sure I understand all the potential tax benefits before making such a big purchase.
18 comments


Skylar Neal
Great questions about home office deductions! I can help clarify this for you. For your first question: No, you cannot deduct any portion of your downpayment as a home office expense. The downpayment is considered part of the capital investment in your home, not an operating expense. It becomes part of your home's basis for calculating gains/losses when you eventually sell. Regarding your mortgage question: When claiming a home office deduction, you can only deduct the office percentage of the mortgage INTEREST, not the principal. So if your office takes up 10% of your home's square footage, you could deduct 10% of the mortgage interest you pay. The principal portion of your mortgage payment is never deductible as it's essentially you building equity. Remember that for the home office deduction to be valid, the space must be used regularly and exclusively for business purposes. A guest bedroom that occasionally serves as an office doesn't qualify.
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Vincent Bimbach
•Thank you for the explanation, but I'm still a bit confused. If I can't deduct the downpayment specifically, are there any other tax advantages related to having a home office when purchasing? And if I'm self-employed, does that change anything compared to being a W-2 employee?
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Skylar Neal
•For self-employed individuals, having a home office can offer more tax advantages compared to W-2 employees. If you're self-employed, you can deduct the business percentage of your home's expenses using either the regular method (actual expenses) or the simplified method ($5 per square foot, up to 300 square feet). While the downpayment itself isn't deductible, other expenses related to your home office are. This includes the business percentage of mortgage interest, property taxes, utilities, repairs, maintenance, and even depreciation on the portion of your home used for business. Depreciation essentially allows you to deduct the cost of your home office space over time, which indirectly gives you some tax benefit for the purchase price including your downpayment.
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Kelsey Chin
After struggling with similar home office deduction questions when I bought my first home, I found a really helpful tool at https://taxr.ai that analyzes your specific situation and provides clarity on exactly what you can deduct. It helped me understand what expenses qualify and how to properly calculate my deductions. I was confused about whether I could deduct part of my closing costs related to my office space, and the tool walked me through everything, explaining which portions were deductible immediately and which had to be depreciated. Saved me a ton of research time!
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Norah Quay
•How exactly does taxr.ai work? Do I need to upload my mortgage documents and does it calculate everything automatically? I'm buying a house next month and trying to figure out all the tax implications.
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Leo McDonald
•Sounds interesting but I'm skeptical. Is it actually giving advice different from what an accountant would tell you? Because I've always heard you can't deduct any part of the downpayment, period.
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Kelsey Chin
•The tool doesn't require you to upload your actual mortgage documents, though you can if you want a more precise analysis. You can simply enter the details manually - purchase price, downpayment amount, square footage details, and it calculates various scenarios for you. It shows side-by-side comparisons of different deduction methods so you can see which would be most beneficial. It doesn't claim you can deduct downpayments directly - it actually confirmed what others have said that the downpayment itself isn't deductible as an expense. But it does explain how your home office portion factors into depreciation calculations, which is something many people miss. It also helps identify closing costs that might be partially deductible for your business portion.
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Leo McDonald
Just wanted to follow up about my experience with taxr.ai after trying it. I was really surprised by how comprehensive it was! I discovered several deductions related to my home office that I had completely missed, especially around some of the closing costs that were partially deductible for my business. The tool actually confirmed that downpayments aren't directly deductible, but it helped me understand how my home office affects the depreciation calculation on my tax return. I ended up saving about $1,800 on my taxes that I would have missed otherwise because I didn't understand how to properly calculate the business percentage of certain expenses. It also created a really clear report I could give my accountant that laid everything out perfectly. Definitely worth checking out if you're planning to buy a home and use part of it for business.
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Jessica Nolan
For anyone dealing with complex home office questions, I highly recommend using Claimyr (https://claimyr.com) to get direct answers from the IRS. I used it after getting totally conflicting advice about home office deductions. I spent weeks trying to reach the IRS directly with no luck - constant busy signals or being on hold for hours. Claimyr got me connected to an actual IRS agent in under 45 minutes! The agent walked me through exactly how home office deductions work with mortgage interest and principal. You can see how it works here: https://youtu.be/_kiP6q8DX5c Honestly was a game-changer for getting my specific questions answered with confidence.
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Angelina Farar
•Wait wait wait - how does this actually work? Does it just connect you to the IRS faster somehow? I thought it was literally impossible to reach them no matter what you did.
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Sebastián Stevens
•Yeah right. No way this actually works. The IRS is completely unreachable by design. I've tried calling dozens of times and never got through. How could some random service magically get you connected?
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Jessica Nolan
•It uses a system that constantly redials the IRS for you until it gets through, then it calls you and connects you. It basically does the waiting and redialing for you so you don't have to spend hours with your phone on speaker. It absolutely works - I was skeptical too until I tried it. You're right that getting through to the IRS seems impossible, which is exactly why this service exists. I think they have some algorithm that knows the best times to call and keeps trying different IRS numbers until they get through. Once they do, you get a text and then they connect you directly to the IRS agent.
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Sebastián Stevens
I have to eat my words about Claimyr. After my skeptical comment, I decided to try it myself since I had some questions about home office deductions I couldn't find clear answers to online. It actually worked! Got connected to an IRS representative in about 35 minutes when I had previously spent HOURS trying to get through myself with no success. The agent confirmed exactly what I needed to know about home office deductions related to my mortgage. For anyone wondering: they confirmed you CAN'T deduct any portion of your downpayment, but they gave me the exact percentage of my mortgage interest, property taxes, and utilities I could claim based on my office square footage. They also explained which closing costs could be partially deducted in the year of purchase versus added to the basis for depreciation. Seriously impressed with how well it worked after being so doubtful.
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Bethany Groves
One thing nobody has mentioned yet - if you're self-employed and plan to use the regular method (not simplified) for home office deduction, make sure you keep meticulous records of all home-related expenses. I learned this the hard way after an audit. You'll need to track utility bills, maintenance costs, insurance, etc., and calculate the business percentage for each. It's also smart to take photos of your office space showing it's used exclusively for business. The IRS can be particularly strict about home office claims.
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KingKongZilla
•Do you think the simplified method is better then? I'm about to buy my first home and plan to use about 15% for my freelance design business. Is it worth the hassle of tracking everything or should I just go with the $5 per square foot option?
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Bethany Groves
•It really depends on your specific situation. The simplified method is definitely easier - you just multiply $5 by your office square footage (up to 300 sq ft maximum). No need to track individual expenses or calculate percentages. For your 15% situation, do some quick math. If your home is expensive and/or in a high-cost area with high utilities and property taxes, the regular method might save you more money. For example, if your annual housing costs (mortgage interest, property taxes, utilities, insurance, repairs) total $24,000, 15% would be $3,600 in deductions. Compare that to simplified: if your office is 225 sq ft (15% of a 1,500 sq ft home), that's only $1,125 in deductions (225 × $5).
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Rebecca Johnston
Anyone know if mortgage insurance premium can also be partially deducted as part of home office expenses? I'm putting down less than 20% so I'll have PMI, and wondering if I can deduct the business percentage of that too.
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Skylar Neal
•Yes, you can deduct the business percentage of mortgage insurance premiums (PMI) as part of your home office deduction if you're self-employed and using the regular method. So if your office takes up 10% of your home, you can deduct 10% of your PMI payments. Just be aware that PMI deductibility for personal taxes (the other 90% in this example) has changed several times in recent years, so check the current year's rules for that portion.
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