The 1042-S Slot Machine

How to play

1. Press Start the machine. A payment ticket drops in: who was paid, for what, and what paperwork you hold. Every ticket is a 2026 payment reported on the 2026 Form 1042-S.
2. Pull the lever or press Spin (Space). The reels stop on random codes.
3. Nudge each reel to the right code with the arrow buttons, a swipe or the mouse wheel. On a keyboard, ← and → pick a reel and ↑ and ↓ nudge it.
4. Press Lock in codes (Enter). Every right reel scores; all reels right is a jackpot with a speed bonus. Jackpots in a row raise your combo to x2 and then x3.
5. The payout slip shows the right code for each box and why. A machine run is 12 tickets: three with one reel (box 1), then two, three and finally four reels (boxes 1, 3a, 4a and 13j).

The real rules behind the game

The 1042-S Slot Machine drills the codes that make a Form 1042-S readable to the IRS. Every answer comes from the Instructions for Form 1042-S (2026) as this site summarises them: the common payments table and code lists in the 1042-S code finder and the code explainers for income codes, chapter 3 exemption codes, chapter 4 exemption codes and chapter 3 status codes.

Box 1: one income code per form

Box 1 takes the two-digit income code from Appendix A, the most specific one that fits, and each Form 1042-S carries one income type. Bank deposit interest is 29, not 01. Film and TV royalties (11), patent royalties (10) and software royalties (12) have separate codes because treaties rate them differently. Pay for services in the United States is 17 for independent contractors, 18 for employees who claim a treaty benefit (other wages go on Form W-2), 19 for teachers and 20 for students and trainees, but an artist or athlete without a central withholding agreement is 42, with recipient status 22. Slot jackpots are 28; blackjack and other listed table games are not reportable. Under a central withholding agreement an artist or athlete is 43. Code 23 is only for income no other code covers. Services performed entirely outside the United States are foreign-source, so there is no Form 1042-S at all.

Chapter 3 and chapter 4 are separate questions

Chapter 3 withholding can be reduced by a treaty or a Code exemption; chapter 4 (FATCA) withholding turns on the payee's FATCA status. Box 3 says which chapter the tax was withheld under, "3" or "4", never both, and "3" when nothing was withheld. Box 3a explains the chapter 3 result and box 4a the chapter 4 result.

Box 3a. Withheld at 30% under chapter 3: 00. A treaty reduced the rate: 04, with a treaty country in box 13b. Portfolio interest: 05. Effectively connected income on Form W-8ECI: 01, with the payee's U.S. TIN in box 13i. Chapter 4 withholding applied instead: 12. Code 02 covers other Code exemptions and reduced rates, such as the 14% rate on scholarships for F, J, M and Q visa holders, capital gain dividends and reportable deposit interest, and only when no other code fits. New for 2026, box 3a needs a code whenever less than 30% is withheld.

Box 4a. Withheld under chapter 4: 00. Pay for services, the use of property, software licenses and scholarships are excluded nonfinancial payments: 16. A withholdable payment to a payee whose status exempts it, such as an individual or an active NFFE: 15. Effectively connected income: 14. Nothing else fits: 21, always with income code 37.

Box 13j. The recipient's chapter 3 status from Appendix B: 15 for a corporation, 16 for an individual, 22 for an artist or athlete paid under code 42 or 43, 23 for a pension fund, 20 for a 501(c) organization, 12 for a qualified intermediary, 08 for a partnership with effectively connected income, and 21 (unknown recipient) only when there is no documentation.

What the game simplifies

Each ticket hands you the facts a valid Form W-8 or Form 8233 would give, and each reel holds six codes instead of the full appendix. Names and amounts change every play. A real form also needs the rates (boxes 3b and 4b), the chapter 4 status (13k), the LOB code (13n) and a valid treaty claim. The chapter 3 withholding calculator works out the codes for one payment, and the guides on chapter 3 withholding and FATCA for payers explain the rules behind them.

Sources

• Instructions for Form 1042-S (2026)
• Form 1042-S, Foreign Person's U.S. Source Income Subject to Withholding
• Publication 515, Withholding of Tax on Nonresident Aliens and Foreign Entities
• Instructions for Form W-8BEN-E
• About Form 8233, Exemption From Withholding on Compensation for Independent Personal Services
• IRC 1441, withholding of tax on nonresident aliens
• IRC 1471, withholdable payments to foreign financial institutions

More knowledge games

• Inbox Zero: Notice Season: Sort W-9s, CP2100s, returned B-Notices and 972CG letters into the right bin before the IRS clocks run out.
• Which Box?: A payment slides in, the clock runs: pick the right 1099 form and box before the timer bar empties.
• Name Control Detective: Crack the four-character IRS name control on 16 case files before the clock runs out.
• The Tip Shuffle: Deal tipped workers, then play the right occupation codes into the W-2 or 1099 box.
• Penalty Drop: Drop late and wrong 1099s down a peg board, hit the $60 tier and call the right IRS rule to pay nothing.
• Escape the Filing Room: Locked in the filing room on January 30: crack seven 1099 puzzles before the clock hits midnight.
• Fifty-State Sort: Route each 1099 to CF/SF, a direct state filing or nothing at all, and fill in a map of 50 states and DC.
• Treaty Passport: A foreign payee's passport lands on your desk: stamp the right withholding rate, 30% or the treaty rate.
• Form Inspector: Run the W-8 desk: hand each foreign payee the right form, then approve or reject the forms that come back.
• Deadline Dash: Filings fly in and the clock runs: tap each one's 2027 due date on the calendar before time is up.
• Real or Fake TIN?: Swipe SSNs, ITINs and EINs as valid or impossible, name the TIN type, then decode IRS TIN matching codes.
• Match Code Rush: Vendor records roll in: predict the IRS TIN Matching code, then fix the record before it turns into a B-Notice.
• Reject Rescue: IRIS acknowledgments land one by one. Read the status and rule codes, then make the right next move.
• Get Your TCC: Roll the weeks and race the calendar from ID.me to an approved IRIS TCC before the 2027 due dates.
• CSV Cleanup Crew: Turn a messy vendor export into an upload-ready IRIS portal CSV: map the headings, fix the bad cells, split the file.
• Schema Surgeon: Operate on IRIS A2A transmissions: find the broken XML nodes, fix them, and get Accepted in ATS.
• FIRE to IRIS: The Move: Sort FIRE-era filing habits into still true, changed or gone before the IRIS season starts.