jm123: being self-employed means you have more cash in your pocket (assuming you earn more than 37,024zl a year, if you earn less than that you're better off being employed because the tax rate on that income level is only 19% anyway). I wouldn't think it's worth the hassle for only four months. One thing to watch out for is the fact that you can not set-up a one person company and then invoice any company for which you have worked in the previous 12 months.
samr: Tax rate here for self-employed is 19% of your net income (same as Poles pay). On top of that are ZUS (national insurance and pension) payments. For the first two years of having a company it's about 200zl per month, after that it rises to about 900zl per month.
vndunne: Yes you can deduct lots of things. Things I deduct/have deducted include: internet bill (100% and the VAT), mobile phone bill (100% and the VAT), monthly tram/bus pass (100%), plane ticket to England at Christmas (100%), all train tickets in Poland (100%), foreign travel (100% plus a per diem allowance), new computer (100% and the VAT), all taxi journeys (100%), cost of accountant (100%), all English language books (100%), mobile phone (100% and the VAT), car insurance (100%), fuel costs (100%), a 48 inch plasma screen TV (100% and the VAT, just make sure the invoice describes the thing as a computer monitor). Because my company is run out of the apartment where I live I can also deduct the administration charge on my apartment (30%), home phone (30%), gas and electricity bills (30%). I could probably deduct a percentage of the mortgage too but the mortgage is already paid off.
Because my company is registered for literary creation (code 92.31g) and I write about restaurants and bars, I also put every restaurant bill and a healthy amount of bar bills through too. The Polish tax man hates it (because the amount which can be spent entertaining clients is strictly limited) but I get paid for writing about those places and obviously can't write about them if I don't go to them!
Yeah I'd insist on payment up front...or at least on a weekly basis.
A complete joke from a complete joke. No school is going to pay teachers in advance. Very very few will pay on a weekly basis (partly because they don't want to quadruple the amount of work involved with paying people and partly because they won't be invoicing their clients on a weekly basis). But then no school is giving Jones a job anyway.