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Last updated November 5, 2025.  You might want to pass this official IRS website along to your clients, to avoid them being misinformed. 

https://www.irs.gov/payments/pay-by-check-or-money-order#:

Pay by check or money order

If you mail your tax payment:
Make your check, money order or cashier's check payable to U.S. Treasury.
Please note: Do not send cash through the mail. If you prefer cash payment, see More information.
Enter the amount using all numbers ($###.##).
Do not use staples or paper clips to affix your payment to your voucher or return.
Make sure your check or money order includes the following information:
Your name and address
Daytime phone number
Tax year the payment is for
Related tax form (like "1040") or notice number
Social Security number (SSN), employer identification number (EIN), or individual taxpayer identification number (ITIN) of the person who should receive credit for the payment
If you filed a joint tax return but you and your spouse were assessed separate amounts, also write "MFT 31 separate assessment” on the memo line.

Notice to taxpayers presenting checks

When you provide a check as payment, you authorize us either to use information from your check to make a one-time electronic fund transfer from your account or to process the payment as a check transaction. When we use information from your check to make an electronic fund transfer, funds may be withdrawn from your account as soon as the same day we receive your payment, and you will not receive your check back from your financial institution.