Taxes are expected to be paid soon after you receive the income or at least quarterly. The next quarterly payment is due Sept 15, 2020.
You can pay the federal taxes using IRS direct pay: https://www.irs.gov/payments/direct-pay
Or you can mail a check using an IRS estimated tax payment voucher: https://www.irs.gov/pub/irs-pdf/f1040es.pdf
Go to your state web site to see how to remit tax payments to your state.
