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Is it possible to submit a Declaration 3-personal income tax through a personal account on the website on?

You can only have the same first generate a digital signature, and then sign a Declaration to the signature. There is a convenient free program to fill in the Declaration 2018. There it is possible to form 3-pit, then to unload and load your personal Cabinet together with scanned documents, sign it by digital signature and send. So without going even once to the tax return to personal income tax if it is refundable. There you can see errors in the Declaration, if any and correct them.
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