How a 945 deposit goes astray
Form 945 deposits are made separately from Form 941 deposits and "cannot be combined" with them (IRM 21.7.2.4.8, Oct. 1, 2012); in EFTPS they are a different tax form selection with a different tax period. The ways a deposit lands on the wrong module are the obvious ones: 941 selected instead of 945, the current year selected in January for a December withholding, the parent company's EIN used for a subsidiary that did the withholding, or the owner's SSN used for a sole proprietorship. The result is symmetrical. The 945 module shows a balance due and generates a CP 161 ("tax, penalties, or interest due on any BMF return with a balance due of $1.00 or more and no math errors," IRM 21.3.1.7.19, Apr. 23, 2024) or a CP 134B when the deposits credited differ from the deposits claimed on the return; the other module carries a credit it has no return for. Left alone, the balance side proceeds to CP504 and the credit side either refunds, offsets, or ages into the Excess Collections File.
The first notice is the moment to fix it. The notice manual's row for a CP 161 where the "Taxpayer indicates a payment was made and has not been credited to their account" is "Research for payment. Refer to IRM 21.5.7, Payment Tracers," and for a CP 134R where excess payments "were intended for another period" it is "Initiate credit transfer to appropriate period. Refer to IRM 21.5.8, Credit Transfers" (IRM 21.3.1.7.19, 21.3.1.7.10).
What to ask for, and what the IRS needs
"Credit transfers may be authorized through oral statement or correspondence received from the taxpayer. The taxpayer may provide information such as: Taxpayer Identification Number (TIN), Date of payment, Amount of payment, Tax period payment intended for, Type of payment" (IRM 21.5.8.4, Oct. 1, 2026). Have the EFTPS confirmation number, the amount, the settlement date, the form and period it was meant for, and the form and period it landed on.
"A credit transfer moves a payment or credit from one module to another, or reverses a credit previously applied" (IRM 21.5.8.2, Apr. 3, 2026). Employees must use the IAT Credit Transfer Tool, which "provides a list of transferable payments" and checks the move for unpostables, so the assistor can see every payment on the from-module while you are on the line. Ask, specifically, for the deposit of a stated amount and date to be transferred from Form 941 (or the wrong EIN or year) to Form 945 for the correct year, with the original payment date preserved. The payment date is what the deposit penalty and the interest run from; a transfer that keeps it makes the 945 module whole as if the deposit had always been there.
Who may ask matters. A reporting agent on Form 8655 is "entitled to verbally receive deposit schedule information" but "does not authorize an RA to request a credit transfer on behalf of a client. The RA may provide payment information as an 'other third-party'" (IRM 21.1.3.5, May 2, 2025). An officer of the business, or someone on a Form 8821 or 2848 covering both forms and periods, must make the request. If the authorization covers Form 945 and not Form 941, the assistor can move the credit only with the business on the line; the calling guide covers the forms.
When a document is required
IRM 21.5.8.3.1 (Oct. 1, 2026); 3.17.220.2 (Dec. 9, 2020).
The manual's distinction is between related and non-related accounts. Related examples include "A taxpayer submits a payment intended for a sole proprietorship, but the payment is applied to the taxpayer's personal account" and "A corporation with multiple subsidiaries submits a payment that is applied to the wrong Employer Identification Number (EIN)"; a transfer between related business accounts needs no source document unless "The transfer will result in a debit balance" (IRM 21.5.8.3.1, Oct. 1, 2026). Non-related examples include "A payment posted to a corporation that should have been applied to a partnership account" and Treasury accounts such as Excess Collections, and for those "A Source Document (SD) is required." For corporate accounts in any direction the rule is stricter still: documentation by fax "identifying the misapplied payment and the correct account to receive the payment." The acceptable document is the payment proof: "A copy of the cancelled check showing the IRS endorsement obtained from the RTR system or confirmation from the taxpayer of the payment amount," the payment DLN, the form, period and date (IRM 21.5.8.3.1). For an EFTPS deposit the acknowledgment number and the EFTPS payment history printout are that proof.
"When transferring a misapplied payment, you must check the filing requirements on CC ENMOD to determine if the misapplied payment established the filing requirement. If it did, remove the filing requirement" (IRM 21.5.8.4.4, Mar. 14, 2024). A 945 deposit sent under the wrong form can create a filing requirement for a return the business never owed; ask for that to be removed in the same call, or a CP259 follows.
The notices a transfer produces
A transfer generates paper on both sides, and the paper is often what prompts the next call. On the receiving module, a CP 225, "Missing Payment Has Been Applied," issues when the assistor records the correspondence date; "The complete CP 225 notice is similar to the Letter 672C, Payment(s) Located and/or Applied, and fully explains the payment transfer and balance due on the module" (IRM 21.5.8.4.4, Mar. 14, 2024). If the incoming credit was timely it also recomputes the penalties: "Transferring timely credits into a module containing a posted TC 166 (Failure to File penalty), TC 176 (Estimated Tax penalty), TC 186 (Federal Tax Deposit penalty), or TC 276 (Failure to Pay penalty) causes these penalties to recompute and generate an adjustment notice CP 210/CP 220," and "You cannot suppress this type of adjustment notice" (IRM 21.5.8.4.4). A CP 210 or 220 after a transfer is therefore good news: the deposit penalty has been recalculated as if the deposit had been on time. On the giving module, when the reversal "will place the module into debit balance" above a redacted amount, a CP 260, "An Erroneous Payment Previously Applied to Your Account Has Been Reversed - Balance Due," goes out (IRM 21.5.8.4.4). If the 941 module had absorbed the stray 945 deposit against a real 941 liability, that CP 260 is a genuine bill.
The credit nobody claimed
"Credits which have IRS-received dates more than one year prior to the current date will be added to the XSF"; they stay there, and "Unapplied credits will remain on IDRS in the XSF seven years after the entry date of the payment to the XSF" before dropping off, and "Credits removed from the XSF will usually have exceeded the statute of limitations for refund" (IRM 3.17.220.2, Dec. 9, 2020). A deposit nobody claims for a year leaves the account; one nobody claims within the refund statute is gone.
A deposit that posts to no return, or to a module with no liability, sits as a credit on the account; a payment the IRS cannot match to any account at all goes to the Unidentified Remittance File and, after aging, to Excess Collections. The Excess Collections function is supposed to look: "Mail appropriate correspondex letter or make telephone contact with the taxpayer for additional information within 45 days of its addition to the XSF," commonly Letter 1687-C, Unidentified Payment/Credit (IRM 3.17.220.2.9, Nov. 30, 2023). Answer that letter. Once a credit is in the file, "XSF records are established, corrected, and applied only by the Campus Excess Collections function," on an internal Form 8765 request from whichever function you reached (IRM 3.17.220.2), so the assistor you call cannot simply move it; they request the application and it follows. The refund statute still governs: a credit older than the IRC 6511 period cannot be refunded or applied to a later liability, which is why the manual says credits dropped after seven years "will usually have exceeded the statute of limitations for refund." The statute page has the periods.
Preventing it
- Separate EFTPS enrollments for 945. Most misapplications are a form-code slip in a payroll system that defaults to 941. Make the 945 deposit a separate scheduled item with the tax period set to the withholding year.
- December withholding is a prior-year deposit when made in January. The tax period on the deposit is the year of the withholding, not the year of the payment.
- Deposit under the EIN that withheld. Withholding "cannot be transferred or delegated to different EINs" on the return side (IRM 21.7.2.4.8.1); deposits should follow the same EIN so the return and the deposits meet on one module.
- Reconcile before January 31. The EFTPS history for the 945 form code should equal line 2 of the return and the box 4 total of the 1099s; the Form 945 page covers the reconciliation and the deposit penalty calculator the cost of being late.
- Answer the first notice. A CP 161 or CP 134B is a question; a CP504 is the start of collection. The transfer is the same either way, but the second one costs a call to ACS.
Questions people ask
Will moving the deposit remove the deposit penalty?
If the deposit was timely for the 945 schedule and the transfer keeps its original date, the penalty recomputes systemically and a CP 210/220 shows the result (IRM 21.5.8.4.4). If the deposit was itself late, the penalty is recomputed on the late date, not removed.
The 941 module shows the deposit was refunded to us. Can it still be moved?
No; a refunded credit is gone from the account. Pay the 945 balance and, if the refund was issued in error, expect the IRS to recover it. If the money was never refunded but offset to another liability, the offset can be reversed and the credit moved, with documentation.
Our payroll provider made the deposit under its own EIN.
That is a transfer between non-related accounts and requires a source document from the provider identifying the payment and your EIN as the intended account; the provider, not you, holds the EFTPS record. The Form 8655 page covers what a reporting agent may and may not do on your account.
How long does a transfer take to show?
The transfer posts in one to three weekly cycles; the manual has the assistor delay the related adjustment a cycle so the notice shows the right balance, and "In three weeks, the taxpayer will receive a notice of adjustment with the correct module balance" (IRM 21.5.8.4.4).