Maybe I misunderstand you, but this makes no sense. For me, all I need is a laptop to do my work, let's say a good one costs me €2000. I buy a mouse, keyboard and good monitor. I don't want to reconnect cables every day so I buy a docking station. All in all another €1000. That's a lot of money, so maybe I can set up a same setup at home as well for that money. So for €3000 I've got everything and that will last me at least five years. After five years I'd probably need to replace only the laptop, so let's say all in all it'll cost you about €500 a year. Now here's the neat part, you're employed so your company should provide you with all those tools. I have a very small business and €3000 is a very small five-yearly investment with the current rates for programmers. After taxes that's still only like a €2000 investment, if even that. As for licences, many companies have free licenses for small teams, students, etc. Like the Visual Studio and SQL Server Community Editions. So you can use those at home, or if you need tools for work, guess what: your employer should provide them. So I guess the answer to your question is 0%.
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