You absolutely must keep at least an Excel table where you calculate your monthly profit

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At the end of the year, you will settle your income with the tax office (you will need a magic table in Excel for this)
And one more important aspect if you don't want to get into trouble with the law :

In the month in which you exceed the threshold of 75% of the minimum wage income, you must register your business within 7 days
Normally, during such activity you do not have to pay ZUS contributions (if you work somewhere else), when you exceed the 75% threshold and register your activity, you will have to start paying ZUS contributions (if the form of activity provides for it)
Attention, now for some less positive news . The lack of activity may be associated not only with the above restrictions, but also with other, even worse ones.

First of all, when selling online, a very important element is the payment gateway . The problem with payment gateways is that most payment operators do not cooperate with unregistered businesses . The popular Przelewy24 and PayU will not cooperate with you unless you have a company.

The fact is that if your store's only payment option is traditional bank transfers, you won't be able to transfer much. In that case, marketplaces like Allegro or OLX will be a better option .

In principle, this is also one of our tips. If you are really unsure greece mobile number database about your idea, it can often be more beneficial for you to decide to sell through an intermediary . You will only set up a real online store when you are sure that your idea has potential.