3 answers
The first thing is to keep your receipts properly, otherwise nothing goes through. It depends a lot on your situation - if you're self-employed it's way more advantageous than if you're an employee, but even then actual expenses (transport, meals, work clothes) can be deducted if you can prove them. Mortgage interest, union dues, donations to certain organizations, that counts too. My advice is really to consult an accountant or check with your local tax authority, because the rules change and depend on tons of personal details I can't assess from here.
Do you have a microenterprise or are you an employee? Because it's really not the same thing. What people often forget is that even as an employee, you can deduct commuting expenses from home to work (if you use your personal car), and especially professional expenses that your employer doesn't reimburse - that could be specific work clothes, tools, training courses. The thing is you've got to keep everything well documented, like already mentioned, but also check with your local tax authority because the rules vary quite a bit depending on where you live.
one thing a lot of people forget about is meal expenses if you're not eating at home during lunch - it's not huge but it adds up fast, like 4-5 € a day and it racks up over the year. the thing is you really gotta keep your receipts and be consistent with your documentation or the tax office will call you out straight away. the catch is you need to be able to explain why it's a work expense and not personal, so if you're hitting up fancy restaurants every week that's gonna raise some eyebrows, even if technically it counts as eating at work.
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