Small businesses with Bitcoin need custody that fits between retail hardware wallets and enterprise solutions. Here's the right approach for every size — from sole proprietors to growing companies.
Small businesses holding Bitcoin face a custody problem that neither retail products nor enterprise solutions solve cleanly. Retail hardware wallets aren't built for organizational control. Enterprise custodians have minimums and fees that make no sense at $50,000.
Here's a practical guide to Bitcoin custody for small businesses — from sole proprietors to 20-person companies.
Individuals can self-custody easily: one person, one hardware wallet, one seed phrase. Institutions use dedicated custodians with relationship managers and $10M minimums.
Small businesses fall in the middle:
The right custody approach depends on your business size and Bitcoin holdings.
For small Bitcoin treasuries under $50,000, the cost and complexity of enterprise solutions isn't justified. A single-signature hardware wallet with strong internal controls is appropriate.
Setup:
Controls to add:
Accounting: US GAAP now allows mark-to-market accounting for Bitcoin (FASB ASU 2023-08). Your accountant will need the cost basis and fair value at each reporting date.
At this range, multisig is worth the setup effort. It eliminates single-person control risk and creates a natural governance structure.
Best options:
Unchained Capital — Collaborative Custody
Casa — Gold/Diamond
DIY 2-of-3 Multisig
Why multisig matters for businesses:
Above $500,000, institutional custody becomes cost-effective and the risk management justifies the fees.
The biggest custody risk for small businesses is key person risk — what happens if the person who controls your Bitcoin keys leaves the company, becomes incapacitated, or acts dishonestly?
Mitigation:
When an employee who holds Bitcoin keys leaves:
For multisig setups: replacing one signer in a 2-of-3 requires the other two signers to sign a transaction to a new wallet.
FASB ASU 2023-08 (effective December 2024 for most companies) requires:
For small businesses, this means your accountant needs:
Use accounting software that integrates with Bitcoin (QuickBooks via third-party plugins, or specialized tools like Cryptio or Bitwave).
Bitcoin should be held in the legal entity that owns it:
This isn't just good practice — it's legally required for proper tax reporting and liability separation.
Small business Bitcoin holdings may be coverable under:
For businesses with Bitcoin holdings over $50,000, verify insurance coverage explicitly — don't assume it's covered.
Recommended: Single-sig hardware wallet (Coldcard or Trezor Safe 5) with seed phrase in a fireproof safe. Annual reconciliation. Document in business records.
Cost: $150 hardware + $100 fireproof safe. Zero ongoing fees.
Recommended: Unchained Collaborative Custody (2-of-3 multisig, you hold 2 keys, Unchained holds 1). Partners each hold one company key stored at different locations.
Cost: $250/year + two hardware wallets (~$300). Total: ~$550 first year.
Recommended: DIY 3-of-5 multisig via Sparrow Wallet, with keys held by CFO, CEO, and one board member. Two hardware wallets at company offices (different locations), one with a trusted outside director.
Or: Casa Diamond at $5,000/year for a managed solution with dedicated support.
Cost: $500 hardware (3-5 devices) + Sparrow (free). Or $5,000/year for Casa Diamond.
Recommended: BitGo or Coinbase Prime institutional custody. Reporting, insurance, API access, and qualified custodian status.
Cost: 0.05%–0.15% annually on AUM + transaction fees.
Before committing to any custody solution:
Does a small business need a custodian for Bitcoin? No. Self-custody with multisig is a legitimate and often cheaper option for businesses under $500,000. A custodian makes sense when compliance requirements, insurance, or reporting needs justify the cost.
Can a business self-custody Bitcoin? Yes. Many small businesses hold Bitcoin in multisig wallets with keys distributed among principals. Unchained Collaborative Custody provides a middle ground — multisig with institutional key backup.
What accounting software handles Bitcoin for businesses? QuickBooks doesn't natively support Bitcoin mark-to-market accounting. Look at Cryptio, Bitwave, or Limechain for dedicated crypto accounting, or work with an accountant familiar with FASB ASU 2023-08.
Should Bitcoin keys be in the company name or personal names? Company Bitcoin should be controlled by keys held in the capacity of company officers — not personally. The Bitcoin itself is a company asset regardless of who holds the keys, but governance documentation should be explicit.
What happens to Bitcoin if a key holder dies? This is a critical question. Build it into your custody setup: multisig ensures no single death locks the company out. Document succession in your corporate bylaws and operating agreement.
Small business Bitcoin custody doesn't require enterprise minimums or complex solutions. Under $50,000, a hardware wallet with internal controls works. At $50,000–$500,000, Unchained's collaborative custody or Casa provides multisig governance at an affordable price. Above $500,000, Coinbase Prime and BitGo become cost-effective.
The non-negotiable: never give any single employee sole control over business Bitcoin. Multisig exists precisely for this problem.
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