The tax system is so complicated, most people can’t handle navigating it on their own. Most people have jobs where taxes are automatically removed from pay checks and sent to both state and federal tax agencies. However, that amount is just an estimate and once a year (or quarter) you need to file paperwork to confirm whether you over or underpaid and then you either get a rebate (without interest), or you’ll need to send in a payment to make up the difference. That paperwork has been lobbied to remain as complicated as possible so that companies like Intuit can provide services that tax payers find useful and continue to pay for. This is more complicated for business owners, both big and small.