Where is my Form 945 refund? How the IRS researches a business refund, and what can shorten it

How long before the IRS will look

The refund inquiry procedure begins with a timetable, and the assistor is instructed not to research the account until it has run. The IRM's table is written around return types; business e-filed returns share one row and paper employment tax returns another.

Two features of business accounts shorten the follow-up. Business filers have no online account, so a rejected direct deposit is converted to a paper check automatically, and a return filed without bank details simply produces a check.

Before any of this, the IRM reminds the assistor that "It is extremely important to consider the refund statute expiration date (RSED) prior to responding to the taxpayer" (IRM 21.4.1.4). A credit the refund statute has already closed cannot be released no matter how clearly the account shows it.

The path a business refund takes

Error Resolution is where most unexplained delays sit. The IRM lists the letters that function sends to business filers, including "Letter 21 C, Employment Tax Return Incomplete for Processing: Form 941, 943, 944, 945, and CT-1" and "Letter 3875 C, Missing or Incorrect EIN on Return" (IRM 21.4.1.4.1.2.5, Oct. 1, 2026). A Form 945 that reaches the campus without a signature, with the wrong year, or under a name that does not match the EIN waits in suspense until the letter is answered, and the refund clock does not run while it waits.

Why a refund is short or missing

When the return has posted but the money has not arrived, or arrived smaller, the IRM gives the assistor a fixed list: "Tax Offsets ... Math Errors ... Invalid Taxpayer Identification Number (TIN) ... Freeze Conditions ... Credit Elect Problems ... TOP offsets," and funds returned by a bank after a direct deposit, where "The amount returned typically is less than the TC 846 due to bank fees" (IRM 21.4.1.5.1, Jan. 29, 2026).

The invalid-TIN cause is the one most specific to this site's readers. "If the TIN on the return does not pass validity checks on IDRS, it is considered invalid," and "The invalid condition must be resolved before the refund can be issued" (IRM 21.4.1.5.4, Oct. 1, 2017). For a business return that means the EIN and the name control on the Form 945 do not match the entity on file, which is the same mismatch a name change or merger leaves behind. The dividing line in the table is the TC 846 amount: if the transcript's refund matches what you claimed but less arrived, the IRS did not take it, and the assistor is told to send you to the Treasury Offset Program rather than research further.

Tax offsets: the IRS keeps it

"Under Internal Revenue Code IRC 6402(a), the IRS may apply a taxpayer's overpayment, including interest, to any outstanding federal tax debt, and shall refund any remaining balance" (IRM 21.4.6.2, Sept. 6, 2022). On the transcript this appears as "TC 820, manual credit transfer; TC 826, computer-generated tax offset; TC 896, computer-generated tax offset from IMF to BMF" (IRM 21.4.6.4.1, Dec. 4, 2014). The receiving module could be an older Form 945 year, a Form 941 balance, or the civil penalty module where an unpaid 972CG assessment sits. A payer who expected a Form 945-X credit and received nothing should look first for a TC 826 on the overpaid year and a matching TC 706 on another; the refund did issue, to the IRS.

The IRM adds a limit: "Overpayments credited against unpaid federal tax liabilities must be credited within the applicable period of limitations" (IRM 21.4.6.2). An offset to a year whose collection statute has expired is reversible, which is one reason to read the receiving module rather than accept the netting.

TOP offsets: Treasury takes it

Offsets for "child support debts, federal agency non-tax debts, state income tax obligations, or unemployment compensation" are not made by the IRS. They "are handled by the Treasury's Bureau of the Fiscal Service ... through the Treasury Offset Program. This occurs after a refund is certified by Internal Revenue Service for payment by BFS, but before the refund check is issued" (IRM 21.4.6.2). Which business refunds are exposed depends on the module they issue from.

The practical difference: a refunded or abated 1099 penalty, which comes out of MFT 13, can disappear into a state tax debt or a federal agency receivable, while a Form 945 overpayment is protected from non-tax debts by the bypass indicator the system places on it ("BPI (3) generates on all refunds from MFTs that are ineligible for TOP offset," IRM 21.4.6.4.2.3). When a TOP offset does happen, the notice comes from the Bureau of the Fiscal Service, not the IRS, and lists the "Agency(s) receiving the offset," the "Amount of each offset" and the agency's phone number; for a paper check with a partial offset the "Notice is sent as an attachment to paper refund" (IRM 21.4.6.4.2.6, May 9, 2024). The IRS assistor is told that inquiries "are referred to the agency listed on the notice, or to the TOP Interactive Voice Response (IVR) system at 800-304-3107" and that this "is the only BFS number the taxpayer should call" (IRM 21.4.6.6.1, Oct. 1, 2024; IRM 21.4.1.5.1).

Lost, stolen or never received

If the transcript shows a TC 846 and nothing has arrived, the IRM's first instruction is to wait: for a paper check, "four weeks (or nine weeks if it's a foreign address) from the mailing date," and "For Business Master File (BMF), the issue/mailing date is one day after the TC 846 date" (IRM 21.4.1.4.4, June 5, 2026). After that, a refund trace begins with Form 3911, Taxpayer Statement Regarding Refund, and the IRS checks whether the check was cashed. A check that was received and then lost or destroyed goes straight to the trace. A rejected direct deposit needs no trace at all: CP 153 tells you a paper check is on the way.

The single-member LLC problem

Many small payers file Form 945 under an LLC's EIN while the owner reports income on a personal return. Since 2009 the LLC is a separate employment-tax taxpayer, and the IRS's systems were slow to catch up.

If an individual refund you expected was applied to the LLC's Form 945 or 941 period, look for Letter 3064C and answer it within the 30 days if you want the credit to stay where it landed; silence returns the money to the individual account and leaves the LLC owing the amount plus interest. If you reply late, "we will honor their request if the funds have not yet been applied back" (IRM 21.4.6.5.26).

What to do

• Pull the transcript before calling. Whether a TC 846 exists, and its amount, decides which script the assistor follows. The transcript page covers how to get one for a business.
• Count the days from acceptance, not from filing. E-file: research after day 21. Paper employment tax returns: after day 56. A call before then will be told to wait, and a Form 945 is not on the table by name, so expect the employment tax row to be applied.
• Match TC 846 to the return. Equal amounts and a smaller deposit mean a TOP offset: call 800-304-3107, not the IRS. A smaller TC 846 means the IRS reduced or applied it: ask which module received the credit and check that module's collection statute.
• Expect a penalty refund to be exposed to non-tax debts. A refunded 972CG assessment issues from MFT 13 and can be offset for state tax or federal agency debts. A Form 945 overpayment cannot.
• Answer Error Resolution letters quickly. Letter 21C and Letter 3875C stop the refund clock; a signed, correctly captioned return restarts it.
• Trace after four weeks, not before. Form 3911 for a paper check; nothing for a rejected direct deposit, which converts to a check and a CP 153.
• Watch the refund statute. A credit that exists on the account can still be lost if the claim was not filed within the refund period; the assistor checks the RSED before anything else.

Questions people ask