TXMOD Cheat Sheet

TXMOD is one of the most critical Command Codes in the Integrated Data Retrieval System (IDRS). It displays the tax module history for a specific TIN, MFT, and Tax Period.

🗺️ The "TXMOD Brain" Architecture

                 TXMOD
                   │
        ┌──────────┼──────────┐
        ↓          ↓          ↓
      MODULE     MONEY      STATUS
        │          │          │
      MFT        TC 150      FRZ
      TXPD       TC 806      HOLD
      STATUS     TC 290      CONTROLS
                 TC 300
                 TC 570
                 TC 846
                   │
                   ↓
                HISTORY
                   │
       ┌───────────┼───────────┐
       ↓           ↓           ↓
    ASSESS       COLLECT     REFUND
     ASED         CSED        RSED

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🔍 Module Header Breakdown

When you pull up a module in TXMOD, look at these top-line identifiers first:

1. TIN (SSN/EIN): Ensures you are looking at the correct taxpayer.
2. MFT (Master File Tax Code):
   • 30: Individual Income Tax (Form 1040)
   • 01: Corporate Income Tax (Form 1120)
   • 10: Employment Tax (Form 941)
3. TAX PERIOD (YYYYMM):
   • For calendar year 1040 returns: 202412 = Tax Year 2024.
   • For quarterly returns (941): 202403, 202406, 202409, 202412.
4. MODULE STATUS: Indicates whether the module is open, closed, or in a collection notice cycle.
5. FREEZE CODES (-V, -Z, -R, etc.): Always check which freeze flags are active before promising anything to a taxpayer.

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🎯 Top 15 Codes to Memorize First

150, 290, 300, 301, 520, 521, 560, 570, 571, 806, 846, 971, 976, 977, 610

Zero-Dollar TCs Matter

Never dismiss a TC simply because the amount is $0.00. For instance:

• TC 570 $0.00 stops all refunds from issuing!
• TC 971 AC xxx $0.00 might document a letter sent or an identity hold!