EFTPS stopped helping elderly clients when a year ago it began to require verification of identity which is over my head (I'm old too). They still prefer mailing vouchers with checks. Also for Social Security withholding I have them mail the VA-4 voucher to our local rural Virginia office that has been (for now) super efficient. Year 2024 was very big in investment taxable income with huge surprises to the elderly wealthy investment class. Once we die out, online payments will be familiar to the younger generation, but with hacking worries. My client's income is all from an inherited portfolio and widower's social security benefits, nothing else, so estimated payments are his scourge.