I work as a freelancer online, I get my money on Paypal and withdraw it to my bank account in Hungary. I deal with American and Australian businesses, so I don't deal with any Hungarian business here.
If you are a legal resident of Hungary, and do your "online" work in Hungary as a resident of Hungary, are typically liable for income tax in Hungary unless there is some relevant tax treaty that modifies this requirement. It does not matter if your clients are in another country, or if you do not work for any Hungarian business. Hungary has the right to tax your income if you live in Hungary (subject to tax treaties).
I also heard about an option that I pay 10% tax for self employment, if I choose this one, do I have to pay any other additional taxes or only this 10 %?
There is a corporate flat tax rate of 10%, and a private entrepreneur income tax 10% (plus a dividend tax of 16%). But for self employed people you might be thinking of the 10% expense ratio option to calculate your income tax basis for your business. That is, you can either get official long receipts for all your business expenses and itemize them to get your income after expenses, or you can just state you wish to have you income "assumed" to have a flat rate of 10% in expenses and you do not have to keep any paperwork or do any accounting. In other words, if you use the 10% expense ratio option, and your self employed small business income was 100,000 HUF a moth, you are taxed on just 90,000 HUF as income (10% reduction for "expenses").
told me to ask the lawyer of tax office via email (they answer in 30 days).
Good advise. But their answer may be "non-binding". That is, you can not use it to win a court case if NAV (the tax authority) says you did your taxes wrong. To get a "binding" answer, you often have to pay for it.
I know that there is a so called family tax allowance that makes it possible for me to decrease the taxes that I pay if I have children. Could you give me further information on this?
see: http://www.doingbusinessinhungary.com/t … ase-credit (and note the limits for this credit for foreign individuals)
She also told me, that probably I had to pay 16% personal income + 27% health contribution even if I have a private health insurance, so the total will be 43% from my income.
If you do not use the KATA system or the simplified entrepreneurial tax (EVA - with a tax /!\ I AM A STUPID SPAMMER /!\7 percent if your business matches the requirements), then yes, this may be your tax burden as a self employed sole-proprietor (34% "employee" tax rate and since you are also the business owner, you have to pay the "employers" contribution of the taxes which brings it to about 43%). This is why KATA is so popular with small businesses here.
Some years ago, as explained to me by the tax office, buying into the national health system became mandatory for all residents in Hungary if you are resident in the country past a certain time period (even if you do not work in Hungary).
The city where you run your business may also impose one or more different additional taxes on your business.
But wait, it gets even worse. If you have clients in the US, you may also be liable for US taxes. See IRS publication 515 for details. As a foreign, non-resident individual your US clients may be required to withhold 30% of your income and provide that to the IRS. And you might need to file a 1040NR tax return to get that money back. If your US client is not withholding, and they should have, it may become a problem for them if they get audited (and for you -- getting recorded as not filing US taxes can result in consequences, such as freezing your US assets (i.e. your Paypal account), and denial of visa to enter the US -- not a problem if you have no wish to ever enter the US). However, any US tax can be applied to offset your Hungarian taxes (you can avoid double taxation).