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Would I ever need credit card if my debit card is issued by MasterCard/Visa?
I was hoping to comment on the original question, but it looks to me like the asker lives in the EU, where credit cards are a lot less common and a lot of the arguments (car rental, building up of credit etc) brought forward by people living in the US just don't apply.  In fact especially airlines (and other merchants) will charge you extra when using a credit card instead of a debit card and this can add up fairly quickly. I hold a credit card purely for travelling outside the EU and occasionally I will travel for work and make my own arrangements, then it can come in handy as I am able to reclaim my expenses before I have to pay my credit card bill (in this case I will also claim the extra credit card fees from my employer). This however is for my personal convenience and not strictly necessary. (I could fill out a bunch of paperwork and claim the costs from my employer as an advance.) In the EU I find that if my VISA debit card will not work in a shop, neither will my credit card, so on that note it's pretty pointless. So to answer the asker question: If you live (and travel) in the EU  you don't need a credit card, ever. If you travel to the US, it would be advantageous to get one. Occasionally banks will offer you a credit card for free and there's no harm in taking it (apart from the fact that you have one more card to keep track off), but if you do, set up a direct debit to pay it off automatically.  And as other people have said: Don't spend money you don't have. If you are not absolutely sure you can't do this, don't get a credit card.