What if you don’t have enough money to pay your taxes right away? There are several options. For starters, you can request a payment extension of up to 120 days after filing to pay in full without penalty. By June, if you haven’t paid yet, the IRS will send you a bill and assess a small penalty and start charging interest. For $105. you can also set up an installment plan and pay a little bit each month with each paycheck. Set that up online here. Just don’t blow it off entirely, the IRS are a lot more tenacious than BMG.