At the end of the year why does it matter what my VAT burden is anyway? As long as I have enough cash in the bank to pay for the things I need, and my bank acco

At the end of the year why does it matter what my VAT burden is anyway? As long as I have enough cash in the bank to pay for the things I need, and my bank account isn't negative at the end of the year, then I'm fine right? What behaviors are you trying to support?