TC 305: Tentative Carryback Allowance by Examination

What the code actually does

IRS Document 6209 (the IRS’s reference guide to its data-processing codes) defines TC 305 as a credit, "Tentative Carryback Allowance by Exam with Interest Computation Date," Doc Code 47 (an examination adjustment): it "inputs a tentative allowance" and carries a beginning interest computation date, functioning as the examination-side counterpart to TC 295. IRM 21.5.9.5.7 includes TC 305 in the "carryback adjustment principal (i.e., TC 295/299/305,309 sum)" it uses for the $100,000 refund threshold, tying it directly into the same carryback reconciliation the rest of the family uses.

Because it is issued through the examination track, TC 305 can appear when a carryback claim is filed on a return or module (the record for one tax type and period) that Examination Division is already handling (IRM 4.38.1.7.3.1.21.2 says TC 305 inputs a tentative allowance from Form 1045, Form 1139 or an amended return).

The 90-day clock depends on the document

Where the TC 305 came from a Form 1045 or Form 1139, IRC §6411(b) gives the IRS 90 days and a limited examination of the application, whichever unit processes it. IRM 4.38.1.7.3.1.21.2 says TC 305 can also come from an amended return, and a carryback claimed on an amended return is an ordinary refund claim with no 90-day clock. Establish which document the client filed. What differs between TC 295 and TC 305 is administrative: a TC 305 posting means Examination handled the intake.

Either TC 304 (the exam-track code) or TC 294 can adjust a TC 305 allowance; Doc 6209 lets both adjust a previously posted TC 295 or 305. So the allowance code on the module does not tell you which code a later adjustment will use.

What this means for the account

A TC 305 credit is provisional in exactly the same sense TC 295 is: it is money paid out after limited review, on the 90-day statutory clock of IRC §6411(b) where a Form 1045 or 1139 started it, not a final determination that the carryback claim is correct. Because it arrived through the examination track, though, it is worth checking whether the same examination already covers other issues on the return — a disallowance of this carryback could surface as part of a broader exam adjustment rather than as an isolated correction.

The amount is also the ceiling on any later TC 304 or TC 294 adjustment — so knowing the TC 305 figure up front scopes the maximum exposure if the carryback claim does not hold up under full examination.

What people mistake TC 305 for

The clearest mix-up is with plain TC 295, which performs the identical function through routine processing rather than Examination — same interest-computation-date mechanic, different document. The allowance code shows which document the IRS used: Doc Code 54 for TC 295, Doc Code 47 (an examination adjustment) for TC 305. It does not by itself show whether the year was under audit; Doc 6209 says a TC 295 "will post to module even if AIMS Indicator (TC 420) is on." Check for a TC 420, the examination indicator. Doc 6209 lets either TC 294 or TC 304 adjust either allowance.

TC 305 is also not itself an examination assessment — it is a credit that pays money out, the opposite direction from TC 300's debit assessment, even though both ride the same Doc Code 47 examination-processing track.

What to do next

Confirm which examination the TC 305 rode in on, and whether that exam is still open — a disallowance may not surface as a separate TC 304 or TC 294 until the broader audit closes.

Verify the filing date of the underlying Form 1045 or Form 1139, or the end of the month in which the return for the loss or credit year was due (with extensions), whichever is later, against the IRC §6411(b) 90-day processing window to confirm the allowance itself was timely handled.

Do not treat the TC 305 amount as a closed, final refund — it remains reversible up to that amount through TC 304 or TC 294 within the limits of the assessment statute.

Run the account history the client supplies through the IRS Transcript Decoder to see whether a TC 420 examination indicator or a TC 304 or TC 294 adjustment already sits alongside this TC 305.