I’m new to estimated payment. I always withheld more on my W2 in the past. I’m wondering how does IRS know my estimated quarterly payment due if I pay direct on IRS website instead of mailing a check with the voucher? Do I must have TurboTax calculate the estimated payment on tax return before I can start paying estimated tax payment for next year? For example, if I anticipate the total tax liability to be $20k, do I must pay $5k each quarter? Can I pay in different amount, such as $3k first quarter, $2k 2nd quarter, $5k 3rd quarter and the remaining $10k the last quarter? As long as I pay the entire $20k estimated tax payment/tax liability before the due date of last quarter, do I need to worry about underpayment penalty or any kind of consequences? Thanks!
