There is no legal limit to how much cash you can deposit into a bank account. You can walk into your bank or credit union with $500 or $500,000 in lawful currency, and the institution will accept it and credit your account. What changes at higher amounts is paperwork: any cash deposit that exceeds $10,000 in a single day requires your bank to file a Currency Transaction Report with the federal government.1eCFR. 31 CFR 1010.311 – Filing Obligations for Reports of Transactions in Currency The report is routine. It is not an accusation, and it does not stop the deposit from going through.
The $10,000 Currency Transaction Report
The Bank Secrecy Act requires every bank and credit union to file a Currency Transaction Report (CTR) for any cash deposit, withdrawal, exchange, or transfer that exceeds $10,000.1eCFR. 31 CFR 1010.311 – Filing Obligations for Reports of Transactions in Currency The report is submitted electronically to the Financial Crimes Enforcement Network (FinCEN), a bureau of the U.S. Treasury that tracks large cash movements to detect money laundering and other financial crimes.2Financial Crimes Enforcement Network. A Quick Reference Guide for Money Services Businesses Credit unions follow the same rule.3NCUA. Reporting and Recordkeeping – Examiners Guide
The threshold works by aggregation. Multiple cash deposits made on the same business day are treated as one transaction if they total more than $10,000, and deposits made at different branches of the same institution on the same day are combined for reporting.2Financial Crimes Enforcement Network. A Quick Reference Guide for Money Services Businesses The bank has 15 calendar days after the transaction to file.4FFIEC BSA/AML Manual. Assessing Compliance with BSA Regulatory Requirements – Currency Transaction Reporting
What Counts as Cash
For CTR purposes, currency means physical coin and paper money, whether U.S. dollars or another country’s legal tender.5FFIEC BSA/AML Manual. Assessing Compliance with BSA Regulatory Requirements – Currency Transaction Reporting Cashier’s checks, money orders, wire transfers, and personal checks do not count as currency under this definition. If you deposit $12,000 made up of $8,000 in bills and a $4,000 personal check, only the $8,000 in bills counts toward the $10,000 threshold.
ATM Deposits
Feeding cash into an ATM triggers the same reporting rule as handing it to a teller. Federal guidance lists ATM transactions among the currency transactions subject to CTR reporting when they exceed $10,000 alone or when combined with other same-day deposits.6FDIC. Currency Transaction Reporting The channel you use does not change the bank’s obligation.
What the Bank Will Ask You For
When your deposit triggers a CTR, the teller needs to confirm your identifying information before completing the report. Expect to provide the following:
- Your full legal name and address, matching official records.
- Your Social Security Number or ITIN, used to identify you in the FinCEN filing.
- A government-issued photo ID, such as a driver’s license, U.S. passport, or military ID.
- An explanation of where the cash came from, such as a home sale, business income, gift, or savings withdrawal.
Non-U.S. citizens without a Social Security Number or ITIN can be identified using a valid passport, alien registration card, or foreign government-issued driver’s license.7Internal Revenue Service. IRS Form 8300 Reference Guide If you already have an account in good standing, most of your information is pulled automatically from the bank’s records, and the teller will usually just ask you to confirm it. A CTR is a routine filing and does not mean you are under investigation.
Do Not Split Deposits to Stay Under the Threshold
Deliberately breaking a cash amount into smaller deposits to keep any single one under $10,000 is a federal crime called structuring. Under 31 U.S.C. ยง 5324, it is illegal to conduct or attempt to conduct transactions in a pattern designed to evade CTR reporting.8Office of the Law Revision Counsel. 31 USC 5324 – Structuring Transactions to Evade Reporting Requirement Prohibited Depositing $4,500 on Monday, $4,500 on Tuesday, and $4,500 on Wednesday, when you intended to deposit the full $13,500 at once, is structuring, even though each individual deposit is legal on its own.
The law targets intent. Making several deposits under $10,000 in the normal course of your life is not a violation. The violation is splitting them for the purpose of dodging the report.
Criminal and Civil Consequences
A structuring conviction can carry up to five years in federal prison, a fine, or both. In aggravated cases, where structuring is part of a pattern of illegal activity involving more than $100,000 in a 12-month period or accompanies another federal crime, the maximum doubles to 10 years and fines increase significantly.8Office of the Law Revision Counsel. 31 USC 5324 – Structuring Transactions to Evade Reporting Requirement Prohibited
Even without a criminal case, the Treasury Department can impose a civil money penalty up to the total amount of the transactions involved. Structure $30,000 in deposits and you could face a civil penalty of up to $30,000.9Office of the Law Revision Counsel. 31 USC 5321 – Civil Penalties
Federal law also allows the government to seize and forfeit property involved in a structuring violation through civil proceedings.10U.S. Department of the Treasury. 31 USC 5317 – Search and Forfeiture of Monetary Instruments Because civil forfeiture runs against the property itself, the government does not need a criminal conviction to take the funds; it must show by a preponderance of the evidence that the money was involved in structuring. If you receive a seizure notice, you generally have 35 days to file a claim contesting it.11Internal Revenue Service. 9.7.2 Civil Seizure and Forfeiture
Suspicious Activity Reports
Banks also file a separate report, called a Suspicious Activity Report (SAR), when they see transactions that look like money laundering, structuring, or other illegal activity. For banks, the threshold is transactions aggregating $5,000 or more when the institution suspects an attempt to evade Bank Secrecy Act rules or the involvement of criminal proceeds.12FFIEC BSA/AML Manual. Assessing Compliance with BSA Regulatory Requirements – Suspicious Activity Reporting
A SAR is filed without notifying you. Federal law prohibits bank employees from telling a customer that a SAR has been filed about them.12FFIEC BSA/AML Manual. Assessing Compliance with BSA Regulatory Requirements – Suspicious Activity Reporting Both human tellers and automated monitoring systems watch for patterns that look off, such as a customer who normally deposits small amounts suddenly making repeated deposits just below $10,000.13Financial Crimes Enforcement Network. Report Reference Final A SAR is not a finding of wrongdoing; it flags the transaction for law enforcement to evaluate.
Keep Records That Explain the Money
Large or frequent cash deposits can also draw IRS attention if they do not line up with the income on your tax return. The IRS uses bank deposit analysis to compare total deposits in your accounts against reported gross income, and if deposits exceed what you reported, the agency may treat the gap as potential unreported income and expand its examination.14Internal Revenue Service. 4.10.4 Examination of Income
Keep documentation that explains the source of any large cash deposit: a bill of sale, a gift letter, inheritance paperwork, or withdrawal receipts from another account. The IRS places the burden of proof on taxpayers to substantiate entries on their returns, so organized records matter if you are ever audited.15Internal Revenue Service. Burden of Proof
The One Real Cap: FDIC Insurance
While no rule caps how much you can deposit, there is a cap on how much the federal government insures. FDIC deposit insurance covers $250,000 per depositor, per insured bank, for each account ownership category.16FDIC. Understanding Deposit Insurance Anything above $250,000 at a single bank in a single ownership category is not insured against the bank’s failure. You can extend coverage by spreading funds across different insured banks or by using different ownership categories at the same bank, such as individual, joint, and certain retirement accounts.
A Separate Rule for Businesses Receiving Cash
If you are asking about depositing personal cash, the rules above are what apply. If instead you run a business and are receiving the cash from a customer, a different reporting obligation kicks in: you must file IRS/FinCEN Form 8300 within 15 days whenever you receive more than $10,000 in cash from one customer in a single transaction or a series of related transactions. This applies to sole proprietors, corporations, partnerships, and trusts.17Internal Revenue Service. Form 8300 and Reporting Cash Payments of Over $10,000 For Form 8300 purposes, debit card and ATM transactions are treated the same as credit card payments and do not count as cash.18Internal Revenue Service. Report of Cash Payments Over $10,000 Received in a Trade or Business – Motor Vehicle Dealership QAs Form 8300 is a business filing about a customer payment, not a filing about your own bank deposit.