What should I do with a savings account in another country?
If the fees to keep the account open are reasonable then it's worth keeping it open for now.  It streamlines things if you need to visit or otherwise have business transactions (e.g. order things from online stores) with France or other EU countries.  If you are not yet even in university, I think it is far too early to predict where you will end up spending your time in life.
Maintain your U.S. bank accounts. Use xe.com to transfer money back and forth. "There is no ""should"", but I am strongly of the view that if you have savings of several months' salary or more, they should not only be in a separate account, but with a separate financial institution, or even split between two others. A fraction of a percent of extra interest is scant reward for massively increased personal risk.  The reason for this is buried in the T&Cs. There is almost always a ""right of set off"": if one account is overdrawn, the bank reserves the right to take money from your other accounts. Which sounds fair enough, until you consider the imbalance of power. Maybe your salary account gets hacked? Maybe that's the bank's fault? Maybe the bank has made an accounting error? Maybe the bank has gone bust? Maybe you need to employ a lawyer to act on your behalf? Oh dear, you no longer have any savings. (*) This cannot happen if your savings are with a completely separate institution. Then, the only way that the salary account bank can touch your savings is by winning in the courts. If you split the savings two ways, you have also given yourself the reassurance that in the worst case only half your savings have been affected. ""Don't put all your eggs in one basket"" is proverbial. And there's a folk song that's lodged in my memory...  ""As through this world I wander, I've met all kinds of funny men. Some rob you with a six-gun, some with a fountain pen. Yet as far as I have wandered, as far as I have roamed, I've never seen an outlaw drive a family from their home"".  I've never been in this sort of trouble and the UK's laws tend to favour the banks' customers. I don't even hate bankers. Yet even so, why take this risk when it can so easily be reduced? (*) If this sounds far-fetched, read the news, for example https://www.theguardian.com/business/2017/feb/02/hbos-manager-and-other-city-financiers-jailed-over-245m-loans-scam" One way of looking at this (just expanding on my comment on Dheer's answer): If the funds were in EUR in Germany already and not in the UK, would you be choosing to move them to the UK (or a GBP denominated bank account) and engage in currency speculation, betting that the pound will improve?   If you would... great, that's effectively exactly what you're doing: leave the money in GBP and hope the gamble pays off.   But if you wouldn't do that, well you probably shouldn't be leaving the funds in GBP just because they originated there; bring them back to Germany and do whatever you'd do with them there. Although not technically an answer to your question, I want to address why this is generally a bad idea.   People normally put money into a savings account so that they can have quick access to it if needed, and because it is safe.  You lose both of these advantages with a foreign account.  You are looking at extra time and fees to receive access to the money in those australian accounts.  And, more importantly, you are taking on substantial FX risk.  Since 2000 the AUD exchange rate has gone from a low of 0.4845 to a high of 1.0972.  Those swings are almost as large as the swings of the S&P.  But, you're only getting an average return of 3.5%, instead of the average return people expect with stocks of 10%. A better idea would be to talk to a financial adviser who can help you find an investment that meets your risk tolerance, but gives you a better return than your savings account. On a final thought, the exception to this would be if you plan on spending significant time in Australia.  Having money in a savings account there would actually allow you to mitigate some of your FX risk by allowing you to decide whether to convert USD when you are travelling, or using the money that you already have in your foreign account. Would it be a reasonable idea to open a savings account in an overseas bank? For the risks you mention, this may not be a good idea for individual. Note HNI / Companies routinely keep funds in various overseas account. For individual the amount of paperwork [reporting in US etc] and fees etc would be high. Plus in adverse conditions, access to this funds would still be stringent and restricted. Some of the other options you can try are  Generally for the risks you mention, there is very little an individual can do except to take it if & when it comes. "I think you can do it as long as those money don't come from illegal activities (money laundering, etc). The only taxes you should pay are on the interest generated by those money while sitting in the UK bank account. Since I suppose you already paid taxes on those money in Greece while you were earning those money. About being audited, in my own experience banks don't ask you much where your money are coming from when you bring money to them, they are very willing to help, and happy. (It's a differnte story when you ask to borrow money). When I opened a bank account in US I did not even have an SSN, but they didn't care much they just took my passport and used the passport number for registering the account. Obviously on the interest generated by the money in the US bank account I had to pay taxes, but it was easy because I simply let the IRS via the bank to withdarw the 27% on the interest generated (not on the capital deposited). I didn't put a huge amount of money there I had to live there for 1 year or some more. Maybe if i deposited a huge amount of money someone would have come to ask me how did I make all those money, but those money were legally generated by me working in Italy before so I didn't have anything to be afraid about. BTW: in Italy I was thinking to move money to a German bank in Germany. The risk of default is a nightmare, something of completly new now in UE compared to the past where each state had its own currency. According to Muro history says that in case of default it happened that some government prevented people from withdrawing money form bank accounts: ""Yes, historically governments have   shut down banks to prevent people from   withdrawing their money in times of   crisis. See Argentina circa 2001 or US   during Great Depression. The   government prevented people from   withdrawing their money and people   could do nothing while their money   rapidly lost value."" but in case Greece prevents people from withdrwaing money, those money are still in EURO, so i'm wondering what would be the effect. I mean would it be fair that a Greek guy can not withdraw is EURO money whilest an Italian guy can withdraw the same currency money in Italy?!" If you're thinking of going back to your home country, you need to check whether you're allowed to keep foreign accounts once back there. In some countries having a foreign account may be illegal. In this case - don't contribute to 401K as you'll have to withdraw, and pay the penalty. If, however, your country of origin doesn't care about you having an account in the US - keep it, and contribute, because then you'll achieve these nice things: Normal high street accounts certainly are available to non-residents. I have several, and I haven't been resident in the UK for fourteen years. However you do need to open them before you leave. They need identification. Once you have one open, the same bank should be able to open other accounts by mail. The disadvantage of course is that you will pay tax on your earnings, and while you can claim it back that's an unnecessary piece of work if you don't have other UK earnings. I would take the risk of an offshore account, assuming it's with a big reputable bank - the kind that are going to be bailed out if there is another collapse. An alternative might be a fixed term deposit. You lock up your money for three years, and you get it back plus a single interest payment at the end of three years. You would pay nothing in tax while you were gone, but the whole interest amount would be taxable when you got back. I would open an account with a bank that has an international presence - branches in both the US and Spain (US Bank, HSBC, Citibank, etc.) Then just transfer the money over to the new account from your old account.  Of course, ensure that you are eligible to open an account and still will have access to it after you move to the US. Other than the exchange risk, one more thing to consider is interest rate risk and the returns you are generating from your money. If it is lying around in a current account with no interest then it is rational to keep it where you intend to stay(US or AUS). Now if your money is working for you, earning interest or has been invested in the market then it seems reasonable that you should put it where it earns the maximum for you. But that comes with a rider, the exchange risk you may have to bear if you are converting between the currencies. Do the returns earned by your money cancel out the FX rates moving up and down and still leave you with a positive return, compared with what you would earn if your money was where you stayed. Consider the below scenarios Do evaluate all your options before you transfer your money. It makes no difference (to the UK) what country a bank account is in.  What matters is whether you are resident in the UK or not while employed locally in a foreign country.  You're taxed on where you are tax resident (which could be either country, both, or neither), not where the money is earned or banked.  You can assume, with modern exchange of information agreements, that all money you put in bank accounts anywhere in the world will eventually be known to the UK authorities. The rules for when you are a UK tax resident changed recently, there is now a statutory test for residence (pdf).  The rules are complex, but in general if you are outside the UK for less than one full tax year you're still resident, and in many cases where you're gone longer than that you may still be, depending on the length of your trips back to the UK and the ties you have there. So a 6-month winter job in Thailand teaching English as a foreign language will be subject to UK tax if you come back after, even if you leave all the money there or in a third country. If you pay local tax as well there are agreements between countries to avoid double taxation, but these do vary.  What you do about National Insurance payments while gone for a short time is another complex area. The big risk for a bank in country X is that they would be unfamiliar with all the lending rules and regulations in country Y. What forms and disclosures are required, and all the national and local steps that would be required. A mistake could leave them exposed, or in violation of some obscure law. Plus they wouldn't have the resources in country Y to verify the existence and the actual ownership of the property. The fear would be that it was a scam. This would likely cause them to have to charge a higher interest rate and higher fees. Not to mention that the currency ratio will change over the decades.   The risks would be large. Lets imagine two scenarios: 1) You make 10.4k (40% of total income) yearly contributions to a savings account that earns 1% interest for 10 years. In this scenario, you put in 104k and earned 5.89k in interest, for a total of 109.9k. 2) You make the same 10.4k yearly contribution to an index fund that earns 7% on average for 10 years. In this scenario you put in the same 104k, but earned 49.7k in interest*, for a total of 153.7k. The main advantage is option 1) has more liquidity -- you can get the money out faster. Option 2) requires time to divest any stocks / bonds. So you need enough savings to get you through that divestment period. Imagine another two scenarios where you stop earning income: 1-b) You stop working and have only your 109.9k principal amount in a 1% savings account. If you withdraw 15.6k yearly for your current cost of living, you will run through your savings in 7 years. 2-b) You stop working and have only 20k (2 years of savings) in savings that earns 1% with 153.7k in stocks that earns 7%. If you withdraw your cost of living currently at 15.6k, you will run through your investments in 15 years and your savings in 2 years, for a total of 17 years. The two years of income in savings is extremely generous for how long it starts the divestment process.  In summary, invest your money. It wasn't specified what currency we are talking about, but you can easily find access to an investment company no matter where you are in the world. Keep a small amount for a rainy day. "would it make sense to set up multiple bank accounts to avoid going above their thresholds?  Quite possiblly yes but you need to pay attention to the fine print. I don't know what the situation is in poland but in the UK accounts that pay high interest often have strings attached. For example the santander 123 current account pays very good interest but it has an account fee and some other requirements that are difficult to meet if you are not using it as your ""main current account"".  You need to read the terms carefully, if you go over the threshold does the lower rate only apply to money over the threshold? or does it apply to all the money in the account? Are there any other restrictions on how you use the account. Also I don't know if poland has any provisions for limited tax-advantaged savings (like the ISA scheme we have in the UK). If it does then that can add further complications. How to calculate how to maximize the profit here? Well in theory you would get the best account you can and fill it to the threshold. Then the next best account and so-on. You would move any interest paid in an account that was already full to the threshold to the best non-full account (or if the account strongly peanalises going over perhaps move an ammount of money equivilent to the interest just before the interest is paid). In practice that is a lot of work, so if the rates on the different accounts are similar you may want to leave some margin for interest or (in the case of an account that pays the lower rate on the overage while still paying the higher rate on money below the threshold) accepting that some of your money will earn slightly less than idea. Another option some accounts may offer is just to pay the interest to another account, avoiding the need to move it yourself. Finally you should check out your government's limits for compensation in the event of banks going bust. As a general rule you don't want to put more than that ammount in a single bank even if doing so would get you the best interest." See my comment for some discussion of why one might choose an identical fund over an ETF.  As to why someone would choose the higher cost fund in this instance ... The Admiral Shares version of the fund (VFIAX) has the same expense ratio as the ETF but has a minimum investment of $10K.  Some investors may want to eventually own the Admiral Shares fund but do not yet have $10K.  If they begin with the Investor Shares now and then convert to Admiral later, that conversion will be a non-taxable event.  If, however, they start with ETF shares now and then sell them later to buy the fund, that sale will be a taxable event. Vanguard ETFs are only commission-free to Vanguard clients using Vanguard Brokerage Services.  Some investors using other brokers may face all sorts of penalties for purchasing third-party ETFs.  Some retirement plan participants (either at Vanguard or another broker) may not even be allowed to purchase ETFs.