How do I claim home office expenses correctly on my tax return?

You can deduct home office costs in two ways: either the flat-rate home office allowance of 6 euros per day (max. 260 working days per year = approx. 1,560 euros) or your actual costs. The flat-rate option is easier if you don't want to keep extensive records. For actual costs, though, you'll need documentation like your rental agreement, utility bills, and receipts for furniture or equipment.

With actual costs, you calculate your workspace's share of the total space. If your home office room is 12 square meters and your apartment is 100 square meters total, that's 12 percent of your utilities, rent, and so on. You document this best with a floor plan and the corresponding bills. Internet, electricity specifically for your workspace, and furniture can also be deducted proportionally.

Important: You don't need to provide extra documentation for the flat-rate allowance - just enter it in the relevant section of your tax return. With actual costs, though, collect all receipts and documentation in case the tax office asks. A lot of people just go with the flat-rate option because it's less hassle and usually sufficient for typical home office days.

With the actual cost method, you need to be careful to only calculate your proportional share of the space - so not the whole apartment, but only the study or desk area. A lot of people make the mistake of just deducting all utilities in full, but that doesn't work. The flat rate is usually the simpler option, unless you've got really high expenses for your home office room.

What do you do for work - do you regularly work from home? If so, the actual cost allocation often pays off more than the flat rate, especially if you have a separate workspace. Then you can deduct rent/utilities, internet, furniture, and renovations on a pro-rata basis - that quickly adds up to a few hundred euros that exceed the 1,560 flat-rate limit.

Have you thought about whether the flat rate or actual costs would work better for you? Here's a practical tip that a lot of people overlook: if you go with the actual costs option, it's often worth setting up a simple Excel spreadsheet where you document your monthly expenses (rent apportioned, electricity, internet, furniture) - that'll save you a ton of stress and follow-up questions from the tax office later. It's also important that you don't keep switching back and forth between the two methods; pick one for the year and stick with it to avoid unnecessary disputes.

I'd be careful with the receipts - the other answers are right, but there's one detail that often gets overlooked: if you go with the flat rate, you don't actually need to prove anything, that's the big advantage. But once you want to claim actual expenses, you really have to be able to document everything, and the tax office also requires you to show clearly what percentage of your apartment your home office takes up - no just guessing. My experience: most people underestimate how much work that becomes, and end up going with the flat rate anyway because they don't have all their receipts together.

Here's how I handle it myself: If you go with actual expenses, it's worth taking a photo of your apartment's floor plan with measurements - that way you can document the exact square footage of your home office and later easily prove how you arrived at your percentage. It saves you headaches if the tax office follows up, because the calculation is immediately clear.

A practical point I never paid attention to before: If your home office serves multiple purposes (like guest room or hobby space), you don't need to convince the tax office that it's purely a work space - what matters is whether you work there predominantly. So you can also write off part of your living room with a desk, as long as that's your main work area and you can prove it.

Important: Once you decide to go with actual expenses, you're stuck with that for at least four years - switching is problematic. One hack a lot of people forget about: write down right away what percentage of your apartment your home office takes up (e.g., 12 sq m out of 80 sq m = 15%), then you can apply that rate to all your utilities and save yourself a ton of paperwork. It's best to collect receipts monthly in a box, otherwise chaos is guaranteed.

Forget the mistakes almost everyone makes: adding up utilities and rent together even though only one of them is relevant, or immediately calculating your entire apartment proportionally 🙈 One practical trick I see people overlook all the time - keep a simple Excel spreadsheet where you document each month which days you actually worked from home. This helps you later with the flat rate (only paid working days count!) or with actual cost calculation (in case the tax official asks how regularly your setup is actually being used). Of course you have to keep receipts for your actual expenses, but this usage documentation is worth its weight in gold if questions come up.

The key thing is that you need to decide upfront which method you're going to use - the flat rate or actual costs - because you can't just switch back and forth. Here's a trick most people don't know about: if you're calculating actual costs, it's often worth documenting your workspace really specifically, like with a photo and a sketch of the room with measurements, so the tax office doesn't give you grief later. It saves you a ton of back-and-forth down the road because you can literally show in black and white how big your home office is and what percentage of your apartment that represents.

The 6-euro flat rate only really makes sense if you work from home less than 3-4 months a year - after that, the detailed accounting usually pays off more 💼 Important: if you go with actual costs, you can't just break down rent proportionally, you also need to factor in all utilities, furniture, and even internet bills - some people really forget a lot there. But watch out for a mistake a lot of people make: you can't just make up arbitrarily high line items, the tax authorities will look at it and want to see receipts. Best thing is to set up a spreadsheet with all your expenses and calculate your room share through it (size of your home office divided by total apartment size).