Banking Law Fundamentals - Powers and Limitations
Learning Objectives
Explain the "business of banking" doctrine and how it limits bank activities
Describe the "incidental powers" framework used by the OCC to evaluate new activities
Define "safety and soundness" and explain why it matters for crypto adoption
Understand capital requirements and how they affect the economics of crypto services
Explain the SAB 121/122 saga and why accounting rules nearly killed bank crypto custody
In 2022, a major national bank calculated that offering crypto custody could generate $200 million in annual revenue within five years. The technology existed. Client demand was clear. Competitors were moving. The business case looked compelling.
The bank didn't launch.
Why? The answer wasn't in the market opportunity or the technology. It was in three letters: SAB (Staff Accounting Bulletin 121).
Under SAB 121, issued by the SEC in March 2022, banks that custodied crypto had to record those assets as liabilities on their balance sheet. This triggered capital requirements that made the economics impossible.
- Crypto custody fee: 0.25-0.50% annually
- Capital charge under SAB 121: 8% of custodied value (roughly)
- If bank custodies $10 billion in crypto:
- **Result:** Unprofitable. Don't launch.
This wasn't about technology, regulation, or client demand. It was about capital and accounting—the hidden forces that actually drive bank decisions.
In January 2025, SAB 121 was rescinded (replaced by SAB 122). The same bank that couldn't make the math work in 2022 announced crypto custody expansion in 2025.
The lesson: Understanding banking law isn't just about permissions. It's about the economics that permissions create.
Unlike general corporations, which can engage in any lawful business, banks are limited to activities that constitute or relate to "the business of banking."
- To exercise "all such incidental powers as shall be necessary to carry on the business of banking"
- By discounting and negotiating promissory notes, drafts, bills of exchange
- By receiving deposits
- By buying and selling exchange, coin, and bullion
- By loaning money on personal security
- By obtaining, issuing, and circulating notes
Translation: Banks can take deposits, make loans, facilitate payments, and engage in activities "incidental" to these core functions.
The restriction on bank activities reflects several policy concerns:
Depositor Protection:
Bank deposits are federally insured. If banks could engage in risky activities, losses could threaten the deposit insurance fund and taxpayer dollars. Limiting activities limits risk.
Concentration of Economic Power:
If banks could own industrial companies, they could dominate the economy in concerning ways. The separation of banking and commerce prevents banks from becoming general conglomerates.
Stability:
Banking crises are economically devastating. Restricting banks to traditional activities—which are well-understood and manageable—promotes stability.
Historical Experience:
The Great Depression, the S&L crisis, and the 2008 financial crisis all reinforced the view that banks need constraints.
When banks want to engage in new activities, the OCC evaluates whether those activities are "incidental" to the business of banking. This framework is how crypto activities were approved.
12 C.F.R. § 7.1000(d) - OCC's Permissibility Framework:
- Is functionally equivalent to or a logical outgrowth of a recognized banking activity
- Is convenient or useful to carrying on the business of banking, such that it:
- Poses risks similar to those already presented by activities the bank engages in
How This Applied to Crypto Custody:
OCC Interpretive Letter 1170 (July 2020) analyzed crypto custody under this framework:
CRYPTO CUSTODY PERMISSIBILITY ANALYSIS
Question: Is crypto custody permissible for national banks?
Test 1: Functionally Equivalent?
→ Banks have custodied assets for centuries
→ Custody involves safekeeping, recordkeeping, reporting
→ Crypto custody is same function, different asset type
→ PASS
Test 2: Convenient or Useful?
→ Clients want unified custody across asset types
→ Facilitates client relationships
→ Enables banks to compete for client business
→ PASS
Test 3: Similar Risks?
→ Custody risks include loss, theft, operational failure
→ Crypto custody has similar risks (plus technical risks)
→ Manageable with appropriate controls
→ PASS
CONCLUSION: Crypto custody is permissible.
The limitations are real. Banks cannot:
Own Non-Financial Companies:
JPMorgan can't own GM. This is the "banking-commerce separation."
Engage in Commerce:
Banks can't operate retail stores, manufacture goods, or engage in non-financial businesses.
Speculate:
Banks can't take principal positions purely for speculation. Activities must relate to customer service or liquidity management.
What About Crypto?
CRYPTO ACTIVITY PERMISSIBILITY
Activity | Permissible? | Rationale
----------------------------|--------------|---------------------------
Custody for clients | Yes | Traditional custody function
Holding stablecoin reserves | Yes | Like holding deposits
Running blockchain nodes | Yes | Like running payment networks
Trading on behalf of clients| Yes (limited)| Execution at client direction
Proprietary trading (speculation)| No | Speculation not permitted
Issuing tokens for profit | Unclear | Banking-commerce questions
Owning crypto exchanges | No | Commerce, not banking
"Safety and soundness" is the fundamental standard for bank activities. Regulators can take enforcement actions against banks that fail to operate in a safe and sound manner.
What "Safety and Soundness" Means:
It's easier to define by example than abstraction:
Inadequate capital for risk level
Poor loan underwriting leading to losses
Insufficient liquidity to meet obligations
Weak internal controls enabling fraud
Management not qualified for activities undertaken
Excessive concentration in risky assets
Failure to properly value assets
Inadequate risk management systems
Capital appropriate to risk
Diversified lending with proper underwriting
Adequate liquidity buffers
Strong internal controls
Qualified management and staff
Proper risk measurement and monitoring
Accurate financial reporting
When banks consider crypto activities, they must demonstrate to examiners that the activity will be conducted safely and soundly. This means:
- Operational risk (technology failures, key management)
- Market risk (volatility affecting balance sheet)
- Legal risk (regulatory uncertainty)
- Reputation risk (association with crypto)
- Counterparty risk (exchange failures)
- Cybersecurity measures
- Key management procedures
- Vendor due diligence
- Monitoring and surveillance
- Incident response plans
- Technical staff for blockchain operations
- Risk managers familiar with crypto risks
- Compliance officers understanding crypto regulations
- Board oversight with appropriate knowledge
- Board approval of crypto activities
- Risk assessment and risk appetite
- Policies and procedures
- Ongoing monitoring results
- Examination readiness
Bank examiners visit regularly—annually for most banks, continuously for the largest. They evaluate whether activities are conducted safely and soundly.
- They can't satisfy examiners that it's safe and sound
- They expect contentious examinations
- They fear enforcement actions
This is why the 2025 regulatory shift mattered beyond just rescinding formal restrictions. The shift signaled that regulators would examine crypto like other activities—critically but not hostilely.
- Banks expected examiner skepticism toward crypto
- Questions about crypto would be problematic
- Better to avoid crypto than face examiner battles
- Examiners directed to treat crypto neutrally
- Crypto examined like other new activities
- Banks can proceed with normal risk management
Banks must maintain capital (equity) as a buffer against losses. Capital requirements determine how much equity banks need relative to their risk.
The Basic Concept:
SIMPLIFIED CAPITAL REQUIREMENT
Assets | Risk Weight | Capital Required*
---------------------|-------------|-------------------
Cash | 0% | $0
Treasury securities | 0% | $0
AAA corporate bonds | 20% | $1.60 per $100
Residential mortgages| 50% | $4.00 per $100
Commercial loans | 100% | $8.00 per $100
Venture capital | 400% | $32.00 per $100
*Assuming 8% capital requirement
- Bank holds $100 million in commercial loans
- Risk weight: 100%
- Risk-weighted assets: $100 million
- Capital required: $8 million (8%)
- This $8 million can't be used for other purposes
The Basel Committee (international bank standard-setter) finalized crypto capital rules in December 2022, effective January 2026.
Group 1 vs. Group 2 Classification:
BASEL CRYPTO CLASSIFICATION
GROUP 1: Lower-risk crypto-assets
├── Group 1a: Tokenized traditional assets
│ → Risk weight of underlying asset
│ → Example: Tokenized bond = bond risk weight
│
└── Group 1b: Stablecoins meeting criteria
→ Must pass redemption test
→ Must be fully reserved
→ Still subject to additional requirements
GROUP 2: Higher-risk crypto-assets (everything else)
├── Group 2a: Limited hedging recognition
│ → 1,250% risk weight
│ → Capped at 1% of Tier 1 capital
│
└── Group 2b: No hedging recognition
→ 1,250% risk weight
→ Same cap applies
What 1,250% Risk Weight Means:
XRP EXPOSURE CAPITAL CALCULATION
Bank wants to hold $10 million in XRP (Group 2)
Risk weight: 1,250%
Risk-weighted assets: $10M × 1,250% = $125 million
Capital required: $125M × 8% = $10 million
Result: Bank must hold $10 million in capital for
$10 million in XRP exposure (100% capital charge)
Implication: Holding crypto as principal is extremely
expensive. Banks will avoid Group 2 exposures.
Capital treatment differs dramatically based on whether the bank holds crypto as principal or merely as custodian:
- Bank owns the crypto on its balance sheet
- Subject to full Basel capital requirements
- Group 2 assets require 100%+ capital
- Economically prohibitive for most crypto
- Bank holds crypto on behalf of clients
- Doesn't own the assets
- Much lower capital impact
- SAB 121/122 was the key issue
- Is permissible under OCC letters
- Has manageable capital impact (post-SAB 122)
- Generates fee revenue without balance sheet exposure
- Avoids 1,250% risk weight problem
- Would require holding crypto as principal
- Subject to prohibitive capital charges
- Economics don't work
- Risk appetite doesn't support
The Basel rules are controversial and may change:
1,250% risk weight treats stablecoins same as Bitcoin
US and UK have declined to implement current rules
Fed Governor Bowman: Rules "not very realistic"
Basel Chair: "We need to start analyzing" differently
Lower risk weights for regulated stablecoins
Recognition of permissionless blockchain progress
More nuanced approach to different crypto types
Investment Implication:
Basel rules could become more favorable, which would enable more bank crypto activity. Watch for Basel Committee consultations and US regulatory implementation.
Staff Accounting Bulletin 121, issued by the SEC in March 2022, addressed how companies should account for crypto assets they custody on behalf of others.
- Record a liability on its balance sheet equal to the fair value of the crypto
- Record a corresponding asset
- Maintain both at fair value (mark to market)
Why This Was Devastating for Banks:
Under traditional custody, banks don't record client assets on their balance sheet. If you hold securities at BNY Mellon, those securities aren't on BNY Mellon's balance sheet—they're yours, and BNY Mellon is just safekeeping them.
SAB 121 changed this for crypto, requiring balance sheet recognition. For banks, balance sheet items trigger capital requirements.
SAB 121 IMPACT ON BANK ECONOMICS
- Client assets not on bank balance sheet
- No capital impact
- Custody fee = profit
- Client crypto recorded as liability
- Asset also recorded
- Both on balance sheet → capital required
- Capital charge destroys economics
- Custody $10B in crypto
- Record $10B liability, $10B asset
- Capital required: ~$800M (8% of liability)
- Custody revenue: ~$30M (0.3% fee)
- Return on capital: 3.75%
- Required return: 15%+
- RESULT: Don't offer crypto custody
The banking and crypto industries fought SAB 121 vigorously:
Congressional Action:
In 2024, Congress passed legislation to overturn SAB 121. President Biden vetoed it. This was one of only a few Biden vetoes.
Bank Workarounds:
Some banks (notably BNY Mellon) obtained SEC non-objection letters allowing different treatment. This was ad hoc, not systematic.
Industry Lobbying:
Banks and industry groups continuously pressured SEC to modify or rescind SAB 121.
In January 2025, the SEC rescinded SAB 121 and issued SAB 122.
- Rescinded the blanket balance sheet recognition requirement
- Returned to traditional GAAP analysis for custody
- Banks can treat crypto custody like traditional custody
- No automatic balance sheet impact
Key Changes:
SAB 121 vs SAB 122
Issue | SAB 121 | SAB 122
------------------------|----------------|------------------
Balance sheet treatment | Required | Traditional GAAP
Capital impact | Major | Minimal
Custody economics | Broken | Workable
Bank participation | Limited | Enabled
- BNY Mellon expanded crypto custody
- US Bancorp resumed crypto custody (September 2025)
- State Street advancing crypto initiatives
- More banks evaluating entry
But Capital Still Matters:
SAB 122 fixed the custody problem but didn't fix the trading problem. Banks holding crypto as principal still face Basel capital charges. This shapes which activities banks pursue.
When a bank evaluates a crypto activity, it considers:
BANK CRYPTO ACTIVITY DECISION FRAMEWORK
1. IS IT PERMISSIBLE?
1. WILL IT BE SAFE AND SOUND?
1. WHAT'S THE CAPITAL IMPACT?
1. WHAT'S THE BUSINESS CASE?
1. DOES LEADERSHIP SUPPORT IT?
This framework explains current bank behavior:
Permissible ✓
Safe and sound achievable ✓
Capital impact manageable (SAB 122) ✓
Business case exists (client demand) ✓
Leadership increasingly supportive ✓
Permissible (limited) ~
Safe and sound achievable (harder) ~
Capital impact prohibitive (Basel) ✗
Business case weak (after capital) ✗
Leadership cautious ✗
XRP Custody:
Banks can custody XRP for clients. The legal framework supports it (IL 1170, 1183, 1184). The capital framework supports it (SAB 122). The question is client demand and bank priorities.
- Basel Group 2 capital charges (1,250% risk weight)
- Need for business case to overcome capital cost
- Likely requires Basel revision or regulatory accommodation
Stablecoin Positioning:
RLUSD, as a stablecoin, might qualify for Basel Group 1b treatment (lower capital charge) if it meets criteria. This could make bank RLUSD involvement more economical than XRP involvement.
Banking law creates a framework where some crypto activities are viable and others aren't. Custody works—it's legally permissible, examiners will accept it, and capital impact is manageable. Principal positions don't work—capital charges make the economics impossible. Understanding this distinction is essential for realistic expectations about bank XRP adoption. Banks will custody XRP if clients want it. Banks won't hold XRP as treasury assets until capital rules change.
Assignment: Analyze whether a specific hypothetical crypto activity would be permissible for a national bank under the OCC's incidental powers framework.
- Receive fiat from the corporate client
- Convert to XRP on a licensed exchange
- Send XRP across the XRPL
- Convert to destination fiat on a licensed exchange
- Deliver fiat to the vendor's bank
(This is essentially the ODL model offered by a bank rather than through Ripple partners.)
Requirements:
Part 1: Incidental Powers Analysis (400-500 words)
- Functional equivalence: Is this functionally equivalent to or a logical outgrowth of recognized bank activities?
- Convenient or useful: Does it facilitate products, enhance sales, improve efficiency, or avoid economic waste?
- Risk similarity: Are the risks similar to risks the bank already manages?
Provide reasoning for each element and reach a conclusion on permissibility.
Part 2: Safety and Soundness Considerations (200-300 words)
- Key risks the bank would need to manage
- Controls that would be required
- Expertise needed
- What examiners would likely focus on
Part 3: Capital and Economic Analysis (200-250 words)
- Would the bank need to hold XRP as principal? For how long?
- What Basel capital treatment would apply?
- Would the economics work given capital costs?
Part 4: Conclusion (100-150 words)
Is this activity likely permissible?
Is it economically viable?
Would you expect banks to offer this service?
Accuracy of legal framework application (35%)
Thoroughness of risk analysis (25%)
Quality of economic reasoning (25%)
Clarity of conclusion and reasoning (15%)
Time investment: 2-3 hours
Value: Develops skill in evaluating bank activity permissibility—applicable to any future crypto-banking development
1. Incidental Powers (Tests Framework Knowledge):
Under the OCC's permissibility framework, which of the following would be a valid basis for approving a new bank activity?
A) The activity is highly profitable and shareholders want it
B) Competitors are offering the activity and the bank is losing market share
C) The activity is functionally equivalent to a recognized banking activity and poses similar risks
D) The SEC has determined the underlying asset is not a security
Correct Answer: C
Explanation: The OCC evaluates new activities under 12 C.F.R. § 7.1000(d), which asks whether the activity is functionally equivalent to recognized banking, convenient/useful for banking, and poses similar risks. Profitability (A) and competitive pressure (B) are business considerations but not legal bases for permissibility. SEC determinations (D) address securities law, not banking law—different regulatory frameworks. The OCC's framework focuses on functional analysis: Is this activity like what banks already do? This is why crypto custody was approved—it's functionally like traditional custody.
2. Safety and Soundness (Tests Conceptual Understanding):
A bank is legally permitted to offer a new service. Under what circumstances might the bank still face regulatory problems?
A) Only if the activity loses money
B) If examiners determine the bank lacks adequate risk management, controls, or expertise for the activity
C) Only if Congress passes a law specifically prohibiting the activity
D) If competitors offer the same service at lower prices
Correct Answer: B
Explanation: "Safety and soundness" is an ongoing operational standard, not just a one-time permission. Even for legally permissible activities, banks must conduct them safely and soundly. Examiners evaluate risk management, internal controls, and personnel expertise. A bank that launches a permissible activity without adequate infrastructure can face enforcement actions, cease-and-desist orders, or other penalties. Profitability (A) is not directly regulated. Congressional action (C) is not required for examiner enforcement. Competitive pricing (D) is a business issue, not regulatory.
3. Capital Requirements (Tests Quantitative Understanding):
Under Basel rules, a bank wants to hold $50 million in XRP as principal. XRP is classified as Group 2 (1,250% risk weight). Assuming an 8% capital requirement, approximately how much capital must the bank hold against this position?
A) $4 million
B) $50 million
C) $400 million
D) $500 million
Correct Answer: B
Explanation: Calculation: $50M × 1,250% risk weight = $625M risk-weighted assets. $625M × 8% capital requirement = $50M capital required. The 1,250% risk weight effectively means the bank must hold 100% capital against the position ($50M position requires $50M capital). This is why banks avoid holding Group 2 crypto as principal—the capital charge equals or exceeds the exposure. Option A would be a normal 100% risk weight asset. Options C and D are computational errors.
4. SAB 121/122 (Tests Historical Knowledge):
Why did SAB 121 prevent most banks from offering crypto custody services before its rescission?
A) SAB 121 explicitly prohibited banks from holding crypto
B) SAB 121 required banks to record custodied crypto as balance sheet liabilities, triggering capital requirements that made custody economically unviable
C) SAB 121 required SEC approval for each bank's custody program
D) SAB 121 imposed fees on crypto custody that exceeded revenue
Correct Answer: B
Explanation: SAB 121 didn't prohibit custody—it required accounting treatment (balance sheet liability recognition) that indirectly made custody uneconomic. Traditional custody doesn't require balance sheet recognition; client assets remain off the custodian's books. SAB 121 changed this for crypto, requiring banks to record both a liability and asset. This triggered bank capital requirements against the liability. For a bank custodying $10 billion in crypto, this meant ~$800 million in capital for a service generating perhaps $30 million in fees—destroying the economics. Option A is factually wrong. Option C is fabricated. Option D mischaracterizes the mechanism.
5. Strategic Implications (Tests Applied Analysis):
Based on current banking law and capital frameworks, which of the following bank crypto activities is most economically viable?
A) Proprietary trading in Bitcoin for profit
B) Custody of client crypto assets
C) Making loans collateralized by crypto
D) Using XRP as treasury working capital
Correct Answer: B
Explanation: Custody is the most viable because: (1) it's clearly permissible under OCC letters, (2) post-SAB 122, it doesn't require balance sheet recognition (minimal capital impact), and (3) client demand exists. Proprietary trading (A) would require holding crypto as principal, facing 1,250% Basel risk weights—economically prohibitive. Crypto-collateralized loans (C) require the bank to value volatile collateral and face potential losses if collateral value drops below loan value—significant risk management challenges. XRP as treasury capital (D) faces the same Basel Group 2 capital charges as trading. Custody is the path of least regulatory and economic resistance.
- National Bank Act, 12 U.S.C. § 24 (bank powers)
- OCC Regulation 12 C.F.R. § 7.1000 (permissibility framework)
- OCC Interpretive Letters 1170, 1183, 1184, 1186 (crypto activities)
- Basel Committee, "Prudential Treatment of Cryptoasset Exposures" (December 2022)
- Basel Committee, "Targeted Amendments to the Cryptoasset Standard" (July 2024)
- Federal Reserve, "Supervision and Regulation Letters" (capital guidance)
- SEC SAB 121 (March 2022) - Original restrictive treatment
- SEC SAB 122 (January 2025) - Rescission
- Bank accounting analysis from major accounting firms
- FFIEC, "Bank Secrecy Act/Anti-Money Laundering Examination Manual"
- OCC, "Comptroller's Handbook: Safety and Soundness"
- Federal Reserve, "Commercial Bank Examination Manual"
- Skadden, "Bank Capital Standards for Cryptoasset Exposures Under Basel Framework"
- Latham & Watkins, legal memos on bank crypto permissibility
- American Banker, coverage of bank crypto developments
For Next Lesson:
Lesson 4 will examine the 2021-2024 "crypto crackdown" era in detail—how each regulatory action built on the previous, how the "pause letters" worked in practice, and how the environment evolved from theoretically permissive to effectively prohibitive. This historical understanding is essential for evaluating the durability of the 2025 reversal.
End of Lesson 3
Total words: ~5,500
Estimated completion time: 50 minutes reading + 2-3 hours for deliverable
Key Takeaways
Banks are legally constrained
to activities that constitute or relate to the "business of banking." New activities must pass the OCC's incidental powers framework, which evaluates functional equivalence, convenience/usefulness, and risk similarity to existing bank activities.
"Safety and soundness" is the operational standard.
Banks must demonstrate to examiners that activities are conducted with appropriate risk management, controls, and expertise. Post-2025, examiners treat crypto neutrally—critically but not hostilely.
Capital requirements determine economics.
Basel rules impose up to 1,250% risk weight on Group 2 crypto assets, requiring 100% capital coverage. This makes holding crypto as principal economically prohibitive for banks. Custody has much lower capital impact.
SAB 121 killed bank crypto custody; SAB 122 revived it.
The SEC's accounting treatment required balance sheet recognition that triggered capital charges. SAB 122's rescission in January 2025 enabled the bank custody expansion now underway.
Custody is viable; trading isn't.
Understanding this distinction explains current bank behavior. Banks are pursuing custody services (BNY Mellon, US Bank, State Street) while avoiding proprietary crypto trading. XRP custody is possible; XRP treasury use requires capital rule changes. ---