Why does my bank suddenly need to know where my money comes from?
"Banks have a financial, and regulational duty called ""Know your customer"", established to avoid a number of historical problems occurring again, such as money laundering, terrorism financing, fraud, etc. Thanks to the scale, and scope of the problem (millions of customers, billions of transactions a day), the way they're handling this usually involves fuzzy logics matching, looking for irregular patterns, problem escalation, and other warning signs. When exceeding some pre-set limit, these signal clues are then filtered, and passed on for human inspection. Needless to say, these algorithms are not perfect, although, thanks to financial pressure, they are improving. In order to understand why your trading account has been suspended, it's useful to look at the incentives: false positives -suspending your trade, and assuming you guilty until proven otherwise- could cost them merely your LTV (lifetime value of customer -how much your business brings in as profit); while false negatives -not catching you while engaging in activities listed above- might cost them multi-month investigations, penalties, and court.  Ultimately, this isn't against you. I've been with the bank for 15 years and the money in the accounts has been very slowly accumulated via direct-deposit paychecks over that time. From this I gather the most likely explanation, is that you've hit somekind of account threshold, that the average credit-happy customers usually do not exceed, which triggered a routine checkup. How do you deal with it? Practice puppetry! There is only one way to survive angry customers emotionally: you have to realize that they’re not angry at you; they’re angry at your business, and you just happen to be a convenient representative of that business. And since they’re treating you like a puppet, an iconic stand-in for the real business, you need to treat yourself as a puppet, too. Pretend you’re a puppeteer. The customer is yelling at the puppet. They’re not yelling at you. They’re angry with the puppet. Your job is to figure out, “gosh, what can I make the puppet say that will make this person a happy customer?”  In an investigation case, go with boredom: The puppet doesn't care, have no feelings, and is eternally patient. Figure out what are the most likely words that will have the matter ""mentally resolved"" from the investigator's point of view, tell them what they have to hear, and you'll have case closed in no time. Hope this helps." Most likely this is connected with new banking regulations related to the Patriot Act, which require banks to be much more inquisitive about their customers and their money. The requirements are mostly about new accounts, but there may be some provisions to backfill this information for existing accounts. Banks and credit unions are constantly required to improve their detection methods for suspicious transactions.  It's not just big transactions anymore, it's scattered little ones, etc. Our credit union had to buy software that runs through transactions sniffing for suspicious patterns.  More regulations and more costs that ultimately get passed on to customers in one way or another. Some of your transactions probably tripped a wire where there was none before. Bank runs very complex software to detect suspicious activity - terrorism financing, money laundering, etc. How would a program know that some person's activity is suspicious? It uses a set of rules. That set might be imperfect (that likely was not intended) - there might be some rule that triggers a warning on your account dominating the fact you've been with them for 15 years. So it's highly likely that an imperfect program triggered a warning on your account and the bank employer didn't dismiss it.
When you swipe your credit card, the terminal at the store makes a request of your bank, and your bank has only a few seconds to accept or reject the transaction. Once the transaction is accepted by your bank, it appears in the Pending transactions. At the end of the business day, the store submits all of the final transactions for the day to their bank in a batch, and the banks all trade transactions in a batch, and money is sent between banks. This is the process that takes a couple of days, and after this happens, you see the transaction move from your Pending transactions into the regular transactions area.  Most of the time, the pending transaction and the final transaction are the same. However, there are cases where it is different. A couple of examples: With a credit account, the fact that the final amount is not known for a few days is no big deal: after all, you don't have any money in the account, and if you end up spending more than you have, the bank will happily let you take your time coming up with the money (at a steep cost, of course). With a debit card tied to your checking account, the transaction is handled the same way, as far is the store is concerned. However, your bank is not going to run the risk of you overdrawing your checking account. They also are not going to run the risk of you withdrawing money from your account that is needed to cover pending transactions. So they usually treat these pending transactions as final transactions, deducting the pending transaction from your account balance immediately. When the final transaction comes through, they adjust the transaction, and your balance goes up or down accordingly. This is one of the big drawbacks to using a debit card, in my opinion. If a bad pending transaction comes through, you are out this money until it gets straightened out. While it’s your personal choice on HOW you save for later its essential that you save. My sister works in a bank and recommended me not to put any money into retirement plans since the tax-advances seem fine but have to paid back when you take the money out of the accounts (in Switzerland, don't know about the united states). Many reasons exist that you suddenly need the money: Buying a house, needing a new car, health issues or just leaving the country forever (and the government trying to make it as hard as possible for you to get your money back). I recommend putting it on a savings account on a different bank that you normally use, without any cards and so on. In short: It can be dangerous to have money locked away – especially if you could easily have it at your hands and you know you're able to manage it. "Let's just focus on the ""why would a bank need to accept deposits from private clients part"" and forget the central bank for a moment. I'm a guy. I have a wife and two kids. They have this pesky habit of wanting to buy stuff. When I get paid, I could just get a check, cash it, stuff it under a mattress, and pull it out when I need it. Hey that worked for a long time didn't it? But sometimes it's nice to write checks. (Just kidding, that's so gauche...) I use my debit card. I use my credit cards, but they need to be paid somehow. My light and phone bills need to be paid too. If only there were someone out there who could facilitate this transfer of money between me, the private client and the merchants I'm forced to spend my money at. Now some of those merchants have plans. Light bills I can pay at my grocer if I choose. But most of the other's don't. Luckily I have a bank that's willing to do this, for a fee. So basically they do it because there's a void in the market if they don't. I don't know if it's true what they say about supply creating its own demand, but it certainly is true that demand creates supply!" "I live in the UK so it's a little different but generally you'd have one account (a current account) which would have a Visa/MasterCard debit card associated before working and any high street bank (don't know what the US equivalent would be, but big banks such as HSBC/Santander) will offer you a savings account which pays a v small amount of interest as well as bonds as all sorts. From what I know most people have their salary paid into their current account (which would be the spending account with a card associated) and would transfer a set amount to a savings account. Personally, I have a current account and a few different saving accounts (which do not have cards associated). One savings account has incoming transfers/money received and I can use online banking to transfer that to my current account ""instantly"" (at least I've done it standing at ATM's and the money is there seconds later - but again this is the UK, not US). This way, my primary current account never has more than £10-15 in it, whenever I know I need money I'll transfer it from the instant access account. This has saved me before when I've been called by my bank for transactions a few £100 each which would have been authorised I kept all my money in my current account. If you don't have money (and dont have an overdraft!) what are they meant to do with it? The other savings account I had setup so that I could not transfer money out without going into a branch with ID/etc, less to stop someone stealing my money and more to be physically unable to waste money on a Friday if I don't arrive at the bank before 4/5PM, so saves a lot of time. US banking is a nightmare, I don't imagine any of this will translate well and I think if you had your salary paid into your savings on a Friday and missed the bank with no online banking facilities/transfers that aren't instant you'd be in a lot of trouble. If the whole ""current + instant access savings account"" thing doesn't work to well, I'm sure a credit/charge (!!!) card will work instead of a separate current account. Spend everything on that (within reason and what you can pay back/afford to pay stupid interest on) on a card with a 0% purchase rate and pay it back using an account you're paid into but is never used for expenses, some credit cards might even reward you for this type of thing but again, credit can be dangerous. A older retired relative of mine has all of his money in one account, refuses a debit card from the bank every time he is offered (he has a card, but it isn't a visa/mastercard, it's purely used for authentication in branch) and keeps that in a safe indoors! Spends everything he needs on his credit card and writes them a sort of cheque (goes into the bank with ID and signs it) for the full balance when his statement arrives. No online banking! No chance of him getting key logged any time soon. tldr; the idea of separating the accounts your money goes in (salary wise) and goes out (spending) isn't a bad idea. that is if wire transfers don't take 3-5 days where you are aha." "I'm not sure I understand your question, but I'll try to answer what I think you're asking. I think you're asking this: ""A US bank receives a wire transfer from a Chinese bank. How does the   US bank ensure there's any money in fact arriving before crediting the   destination account?"" Well, the way wire transfers work is that the US bank would debit the senders' account with that US bank. So the US bank in fact transfers the money between two internal accounts: debit to the Chinese bank's account with that US bank and credit the destination customer account. If the Chinese bank doesn't have an account with the destination US bank - a third party intermediary is used that both banks have accounts with. Such third party will charge an additional fee (hence sometimes the wire transfer fees are slightly higher than you initially know when sending the money, the third party would debit from the transfer amount). ""Regular"" IBAN/ACH transfers work through regulatory channels that ensure integrity and essentially use a regulatory bank as that third party. But because they're done in batches and not on-line, they're much cheaper, and the accounting is for the whole batch and not each transfer separately. But batch processing means it will take a day or two of processing, while wire transfer takes hours at most." In the US, the bank is legally required to report any cash transactions over 10k$ to the government. This normally has no consequences, and you will never hear about it. No need to worry about it. If the amount is very high, or you do it repeatedly, or the government has other (pre-existing) reasons to look at your finances sharply, they might ask you where the money came from and what you did with it, but your explanation is perfectly fine (assuming it is true). The idea is to catch money-launderers that try to get large illegal cash incomes into the banking system. Classic example is the drug lord who makes a million a month in cash from selling drugs, and needs to get this million into the banks (as you can't buy houses or luxury cars or yachts with cash without getting FBI attention right away). Here's a point in favor of central banks: With a central bank in the middle making sure payments clear, transactions can happen with near perfect trust. When a bank has a daylight overdraft, the Fed covers it. When a bank needs overnight funding, the Fed provides it. If a bank needs vault cash, a truck shows up from the Fed.  Without this, no one could ever be entirely confident the other party was money-good. With a volume of transactions that can amount to annual GDP in as little as six days, this level of trust is critical to a smoothly functioning system of payments. In order for you to send me check for $10 you would have to know my banking details. You would have to know the bank number and the account number. Giving you this information does put my funds at risk.  While you would know this for a small circle of friends you wouldn't know this for everybody. My parents have 19 grand kids. They would have to know the banking account information for all 19. While my parents can be trusted with this information their grand children would have to make sure that they had the updated information. Instead they just mail them a check or give them a check on their birthday or other special occasion. Most of the time that money needs to be transferred it is not important that it immediately be converted to cash. The question you referenced is about how the Unbanked function: The unbanked are adults who do not have their own bank accounts.   Along with the underbanked, they may rely on alternative financial   services for their financial needs, where these are available. These people need check cashing places to get money. They don't have a bank account. There is no place for you to electronically send money. Every source of income for them has to start as cash, or be converted to cash. All spending they do is by cash. If they need to pay by check they convert cash to a money order for a fee.