@PiSigma No you don’t have to send in a main 1040ES ahead of time. And every year the IRS mails me 1040 ES forms prefilled with my personal info so I only need to write in the amount. Then they fit in the envelopes.
Or you can pay directly on the IRS website https://www.irs.gov/payments
Be sure to pick the right kind of payment and year.....2026 Estimate
