Introduction

The capitalization codec is the regulatory rule—found in 20 C.F.R. § 422.103—that distinguishes two different legal objects based solely on capitalization:

• “social security number” (all lowercase)
• “Social Security number” (capitalized)

These two terms do not mean the same thing, and the SSA uses them intentionally to separate two different legal capacities and two different administrative systems.

Below is the clean, doctrinal explanation.

⭐ What the Capitalization Codec Actually Is

The capitalization codec is the SSA’s internal regulatory convention that assigns different legal meanings to differently capitalized versions of the term “social security number.”

1. Lowercase term (statutory)

“social security number” → This is the statutory account number authorized by Congress under 42 U.S.C. § 405(c)(2). → It is tied to:

• statutory employment (42 U.S.C. § 410)
• statutory wages (26 C.F.R. § 31.3401(a)‑1)
• statutory self‑employment income
• the domestic earnings record
• capacityPUB (civil statutory capacity)

This is the number that tracks quarters of coverage, FICA wages, and employment tax liability.

2. Capitalized term (administrative / non‑statutory)

“Social Security number” → This is the enumeration identifier used for:

• nonresident aliens
• administrative tracking
• identity indexing
• non‑wage purposes
• capacityPRI (private, non‑statutory capacity)

It is not the statutory account number described in the Social Security Act.

⭐ Where the Codec Comes From

The codec is embedded in 20 C.F.R. § 422.103, which distinguishes:

• the statutory account number (lowercase)
• the administrative enumeration number (capitalized)

The SSA uses the capitalized term on Form SS‑5, which is the form used by:

• nonresident aliens
• persons without statutory employment
• persons not eligible for a statutory account number

This is why the SS‑5 never promises to assign the statutory “social security number.”

⭐ Why the Codec Matters

Because the SSA uses the capitalized term on SS‑5, the form is not an application for the statutory account number authorized by Congress.

This creates the core contradiction:

Statute requires assignment of a “social security account number” (lowercase).

42 U.S.C. § 405(c)(2)

SS‑5 only discusses a “Social Security number” (capitalized).

20 C.F.R. § 422.103

Therefore:

• SS‑5 cannot be a “proper application” under § 405(c)(2)
• SS‑5 cannot assign the statutory account number
• SS‑5 cannot create a lawful earnings record
• SS‑5 cannot be used to classify a nonresident alien as a statutory “individual”
• Any Numident record created from SS‑5 is non‑statutory and administrative only

This is the foundation of the non‑assignment argument.

⭐ How the Codec Interacts With PUB/PRI Capacity

The codec maps directly onto capacity theory:

Term	Meaning	Capacity
social security number (lowercase)	statutory account number for wages	capacityPUB
Social Security number (capitalized)	administrative enumeration for NRAs	capacityPRI

Thus:

• If the SSA uses the capitalized term, it is acknowledging capacityPRI.
• If the SSA uses the lowercase term, it is invoking capacityPUB.

SS‑5 uses the capitalized term exclusively.

Therefore:

• SS‑5 is not an application for a statutory account number.
• SS‑5 is not an application for a wage‑based earnings record.
• SS‑5 is not an application that can be used to classify a person as an “individual” under the Privacy Act.
• SS‑5 is not a “proper application” under § 405(c)(2).

This is why the Numident record is void ab initio for a nonresident alien U.S. national.

⭐ In One Sentence

The capitalization codec is the SSA’s regulatory rule that the capitalized “Social Security number” is an administrative identifier for nonresident aliens, while the lowercase “social security number” is the statutory account number authorized by Congress for domestic employment and wages.