Proving the source of funds (SOF) requires documenting the legitimate origin of money through bank statements, tax returns, pay slips, and transaction records (e.g., property sale contracts). It involves creating a clear, traceable paper trail from the source to the final account, ensuring compliance with anti-money laundering (AML) regulations.
Supporting documents and proof
Examples of acceptable proof for SOF and SOW
Source of Funds and Source of Wealth can be established through a combination of sources, such as: Bank statements. Salary payment documents. Property sale records.
Legitimate sources of funds include earnings from employment, business income, investment returns, loans, and inheritances. These sources are generally verifiable through official documentation such as pay slips, tax returns, and bank statements.
Banks may ask questions about large deposits, and they're required to document certain details. That doesn't mean you're under investigation. It's part of the bank's compliance process. To protect yourself, keep clear records: invoices, receipts, contracts, or any documents showing where the money came from.
A paper trail of potentially suspicious deposits is created after Form 8300 is transmitted to the IRS. Depositing cash at an ATM or with a bank teller, so long as it is below the $10K threshold, will usually not be reported.
Examples of documents and data you could use to identify the source of funds or source of wealth in higher risk situations include:
Depositing $2,000 in cash isn't inherently suspicious and is well below the $10,000 reporting threshold for banks, but it can raise flags if it's part of a pattern (structuring), inconsistent with your normal income, or involves other red flags like frequent large cash deposits from others, leading to a potential Suspicious Activity Report (SAR). To avoid issues, have clear records for the cash's source, like invoices or sales receipts, especially if you deal in cash often.
Suspicious sources of funds
Typical red flags include: Deposits from many different individuals or companies, possibly indicating an attempt to obscure the origin through smurfing. Deposits from multiple geographic areas outside the client's normal business zone often point to attempts to evade pattern detection.
The "$10,000 bank rule" refers to federal laws requiring financial institutions and businesses to report large cash transactions (deposits, withdrawals, payments) of over $10,000 in currency to the government to combat money laundering and financial crimes. Banks file Currency Transaction Reports (CTRs) for cash activity over $10,000, while businesses file Form 8300 for similar payments, both sending info to FinCEN and the IRS to track illicit funds.
The most common documents are:
Red flag #1: Suspicious sources of funds
Deposits into accounts or online wallets that are “significantly higher than ordinary with an unknown source of funds, followed by conversion to fiat currency, which may indicate theft of funds.”
Cash deposits over $5,000 don't automatically trigger a government report. But they do put the transaction into a higher scrutiny bucket inside your bank. Tellers are trained to watch for patterns that look unusual for you. A single large deposit tied to a clear explanation rarely raises eyebrows.
A Proof of Payment is a document that verifies a financial transaction has been completed, confirming that funds have been transferred from one party to another. Common payment documents include a receipt, bank statement, or invoice, each detailing the transaction amount and parties involved.
Evidence of funds held in a bank account
You can deposit up to $10,000 cash before reporting it to the IRS. Lump sum or incremental deposits of more than $10,000 must be reported. Banks must report cash deposits of more than $10,000. Banks may also choose to report suspicious transactions like frequent large cash deposits.
The IRS "$600 cash rule" refers to the requirement for third-party payment apps (like Venmo, PayPal) to report payments for goods/services over $600 on Form 1099-K, but this threshold has been delayed, with a phased-in plan, so for tax years 2023 and prior, the old rule ($20k/200+ transactions) applies, while the $600 rule (any amount over $600) is being phased in for later years (e.g., planned for 2024) to ease the transition, though all business income, regardless of reporting, must be reported by the recipient.
The best thing you can do to avoid the suspicion of illegal activity is to just deposit the money all at once, whether it is a small amount from your daily sales or it is a large amount from a huge sale. Always file the appropriate forms.
In a money laundering case, prosecutors must prove beyond a reasonable doubt that the accused was engaged in illegal financial activities and attempted to conceal the origins of the funds. Money laundering isn't so much about the movement of the money. Instead, it is about the purpose behind the movement.
The following are typically accepted:
1️⃣ They don't talk about how much money they make. 2️⃣ They drive a modest car (most of the time) 3️⃣ They splurge on rare items that are not outwardly noticeable.
Federal regulations require specific reporting when physical currency deposits into your financial institution exceed certain amounts—not to restrict your deposits, but to help combat money laundering and financial crimes. The key number to remember for 2025 is $10,000.
CD accounts may offer better interest rates than savings accounts. Longer terms will usually also have more favorable rates. Note that your rates will remain fixed if you chose a fixed CD rate over an adjustable CD rate.