you can just change the amount on any one voucher and mail it in with one check for all 3 quarters. your other option is to go online and pay through the IRS website
https://www.irs.gov/payments
No note needed. When you do your 2024 tax return make sure to enter the payment on the tax payment worksheet along with the date of payment. Turbotax will compute if you owe the underpayment of estimated tax penalty using the date and amount you enter. don't forget about the 4th quarter payment. Turbotax also gives you the option to suppress the calculation of penalty and let the IRS bill you. If the estimated tax payment is needed the sooner you pay the lower the penalty. Turbotax also gives you the option to suppress the calculation of penalty and let the IRS bill you.
with reasonable cause, you can request the IRS waive the penalty. see the 2210 waiver of penalty section on page 2. I don't think failure to enter info in your bill management system is a reasonable cause but then I'm not the IRS.
https://www.irs.gov/pub/irs-pdf/i2210.pdf
here are the rules used to determine if you owe this penalty.
There will be no federal penalties for not prepaying enough taxes during the year if withholding and
- timely estimated tax payments equal or exceed 90% of your 2024 tax or
- timely estimated tax payments equal or exceed 100% of your 2023 tax (110% if your 2023 adjusted gross income was more than $150K) or
- the balance due after subtracting taxes withheld from 90% of your 2024 tax is less than $1,000 or
- your total taxes are less than $1,000
state laws differ
