Now imagine the athlete earns NIL income throughout the year from multiple sources. They earn $30,000 total and spend $5,000 in legitimate business expenses to end the year with a $25,000 net profit. In this scenario, quarterly estimated tax payments are highly recommended to avoid penalties and prevent a huge bill in April. Based on the example earlier in this guide, the athlete’s total estimated tax bill was $4,844. Since quarterly payments are made four times per year, the athlete would divide that total by 4 to estimate what to send each quarter: $4,844 ÷ 4 = $1,211 per quarter. Paying around $1,200 per quarter helps athletes stay protected, avoid IRS penalties, and avoid getting hit with a surprise tax bill at the end of the year.