Form 1120 Corporate Tax Return

Half-Width vs Full-Width Characters on IRS Forms: Use ASCII Only (Form 1120 and 5472)

2:31Premium Video

Written byLipai WangFounder · IRS-registered tax professional

Key Takeaways

Always use standard half-width ASCII characters on IRS forms
Full-width characters from CJK keyboards will cause processing errors
Switch to English keyboard input before entering form data

Half-Width vs Full-Width Characters

If you use a non-English keyboard (Chinese, Japanese, Korean), you may enter full-width characters instead of standard ASCII. IRS systems expect standard half-width ASCII characters — the basic Latin alphabet, numbers 0-9, and standard punctuation.

Why This Matters

Full-width characters have different Unicode values than their half-width equivalents. 'A' (full-width, U+FF21) and 'A' (half-width, U+0041) look similar but are completely different to a computer. Using full-width characters can make your form unreadable to IRS systems.

How to Fix This

Switch your keyboard input method to English before typing IRS form data. Tax preparation tools like ForeignLLCTax.com handle character encoding automatically.

Frequently Asked Questions

Can I enter my name in non-Latin characters?

No. All text on IRS forms must be in standard ASCII Latin characters. Use the English spelling of your name as shown on your passport.

form 1120corporate taxforeign-owned LLC

IRS Form 1120 Instructions

Official IRS source on irs.gov

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