Tax rules for United States citizens living in the US but being paid from outside the US
You can and are supposed to report self-employment income on Schedule C (or C-EZ if eligible, which a programmer likely is) even when the payer isn't required to give you 1099-MISC (or 1099-K for a payment network now). From there, after deducting permitted expenses, it flows to 1040 (for income tax) and Schedule SE (for self-employment tax). See https://www.irs.gov/individuals/self-employed for some basics and lots of useful links. If this income is large enough your tax on it will be more than $1000, you may need to make quarterly estimated payments (OR if you also have a 'day job' have that employer increase your withholding) to avoid an underpayment penalty. But if this is the first year you have significant self-employment income (or other taxable but unwithheld income like realized capital gains) and your economic/tax situation is otherwise unchanged -- i.e. you have the same (or more) payroll income with the same (or more) withholding -- then there is a 'safe harbor': if your withholding plus estimated payments this year is too low to pay this year's tax but it is enough to pay last year's tax you escape the penalty. (You still need to pay the tax due, of course, so keep the funds available for that.) At the end of the first year when you prepare your return you will see how the numbers work out and can more easily do a good estimate for the following year(s). A single-member LLC or 'S' corp is usually disregarded for tax purposes, although you can elect otherwise, while a (traditional) 'C' corp is more complicated and AIUI out-of-scope for this Stack; see https://www.irs.gov/businesses/small-businesses-self-employed/business-structures for more.
IANAL, I am married to someone in your situation. As a US citizen age 26 who has not had any contact with the IRS, you should most definitely be worried... As a US citizen, you are (and always have been) required to file a US tax return and pay any tax on all income, no matter where earned, and no matter where you reside.  There are often (but not always) agreements between governments to reduce double taxation.  The US rule as to whether a particular type of income is taxable will prevail. As a US citizen with financial accounts (chequing, saving, investment, etc.) above a minimum balance, abroad, you are required to report information, including the amounts in the account, to the US government annually (Look up FBAR).  Failure to file these forms carries harsh penalties. A recent law (FATCA) requires foreign financial institutions to report information on their US citizen clients to the US, irrespective of any local banking privacy laws.  It's possible that your application triggered these reporting requirements. You will not be allowed to renounce your US citizenship until you have paid all past US taxes and penalties. Good new:  you are eligible in ten years or so to run for President. Don't believe any of this, or that nothing has been missed; you must consult with a local tax expert specializing in US/UK tax laws. "I'll add a bit to Paul's excellent write up. Foreign Earned Income Exclusion (form 2555): notice the earned there. It doesn't exclude capital gains, interest, dividends, and basically everything that is not salary. You pay US taxes on it from the first cent. Foreign tax credit - foreign tax credit (form 1116) doesn't reduce your US tax dollar for dollar (even though it may appear that it does from the generic explanations). By using this form you may end up accumulating unused credit while still paying double taxes at the same time. Happened to me. Thank Congress for the logical and reasonable US tax laws. New FATCA form 8938: as opposed to FBAR (that goes to the FinCEN in the Treasury), this one goes to the IRS. it contains very similar info, but the threshold requirements are different. You may have to file FBAR, but not these, or you may have to file both. Being an American citizen, some European banks will refuse to provide services to you. Again, thank Congress for FATCA. It requires foreign banks to enforce US tax regulations on US citizens, and banks that won't will get penalized in the US. Many banks refuse to provide services to Americans because of that because what IRS requires is illegal in most countries. Some countries (like UK and some other EU countries) have signed treaties with the US to resolve this, but many haven't. Currency conversion - as I commented to Paul, you convert the amounts when you receive them, which may have your fixed EUR salary be converted to different dollar amounts every time. You need to make sure you do it right. Pensions, savings, investments - if you're doing these in non-US instruments prepare to be penalized. US taxes foreign investments much more aggressively than domestic. If you're investing in indexes/mutual funds, or you're a principle in a corporation, or you create a pension account - you'll get hit by additional reporting requirements and tax. Tax treaties - the US has tax treaties with many EU countries, and equalization treaties with some. The tax treaties affect the standard tax treatment by the US and some of the ""generic"" info you got here may not apply because of a tax treaty, and some other rules may apply. Equalization treaties work similarly with regards to the Social Security. Bottom line, and I know Paul disagrees with me on this - talk with a US-licensed adviser in the country you're going to. It is very important for your tax adviser to know the relevant treaty (and not read it the first time when you call him), and to understand each and every financial instrument in your country. Missing piece of paper in your tax return can cost you thousands of dollars in penalties (not exaggerating, not filing form 3520 triggers a $10000 penalty, even if there's no tax) and additional taxes." "Well, perhaps ""have a dedicated tax advisor"" is an answer then. I   wouldn't have thought of this, as it's not specifically about   taxation, is it? Or more broadly ""consult with a dedicated   professional for the situation in detail""... Yes, that is the only real answer you can get. Anything else will vary between highly localized to entirely incorrect. Pensions are rarely defined benefit anymore, and not many countries still keep state-sponsored defined benefit pension plans. For most, what's left is Social Security system, which is in no way a pension. This is an insurance, and is paid as tax which is rarely refundable (but you won't always have to pay it if you're a foreigner in the country). Usually, Social Security benefits are only available to citizens and (/or, in some rare cases) residents of that country. So it is unlikely (although possible) that you'll benefit from social security payments of more than one country. Some countries have totalization treaties that make your social security payments in one count in the other. If you're in a country that has such an agreement with the Netherlands - you're lucky. Your personal pension savings are basically tax-deferred investment accounts. But tax deferral in one country doesn't necessarily work in another. In the US you have 401k or IRA accounts, but in your own country they may very well be taxable. So you gain the tax deferral in the US, but if your own country taxes them - you lost the benefit, and you will still have to abide by the US tax rules when taking the money out. If you don't plan properly you can easily be hit by double taxation in such cases. Bottom line, you need to plan your pension savings on your own, privately, with a good and solid tax advice (and pension planning advice) that would be relevant to all the countries that you are tax resident at at any given time (you can easily be resident for tax purposes in more than one country). These advisers have to take into account the laws of the countries involved, the tax treaties between themselves and between them and the country of your citizenship,  and the future countries you're planning on visiting or getting old at. Its complicated, and most likely you won't be able to predict everything, especially because the laws and treaties tend to change over time." There are specific cases where you are required to use ADS: Required use of ADS.   You must use ADS for the following property. Listed property used 50% or less in a qualified business use. See chapter 5 for information on listed property. Any tangible property used predominantly outside the United States during the year. Any tax-exempt use property. Any tax-exempt bond-financed property. All property used predominantly in a farming business and placed in service in any tax year during which an election not to apply the   uniform capitalization rules to certain farming costs is in effect. Any property imported from a foreign country for which an Executive Order is in effect because the country maintains trade   restrictions or engages in other discriminatory acts. See publication 946. If none of those apply to your property - you may elect ADS. Why would you elect ADS when you're not required to use it? If you can't think of a reason, then don't elect it. For most people the shorter the depreciation period - the more they can deduct (or accumulate in passive losses) each year, and that is usually the desirable case. If you plan on selling in 10 years, keep in mind the depreciation recapture and consider whether the passive losses (offsetting regular income) are worth the extra tax in this case. It essentially works the same. Some states don't have any income taxes at all (like Florida or Wyoming), some only tax income derived in the state, and some tax worldwide income (like New York or California), similarly to the Federal income taxes. However, if you're living abroad (i.e.: you're a citizen or resident of a foreign country and you live there), you're not considered resident by most of the states (check with your state for specific definitions) for most, if not all, the time of your residency abroad. In such case - you don't pay state taxes, only Federal. You have to remember that foreign income exclusion doesn't apply to the income from your 401k, so you pay the taxes as if you're in the US. You can not use foreign taxes credit as well (but depending on the tax treaty with the country you're moving to, your 401k income might not be taxable there). In some cases you may end up with double taxation: US will tax your 401k income as you're a US citizen and the income is derived from the US sources, and the foreign country will tax the income based on its own laws. This is not a tax advice, and this answer was not intended or written to be used, and it cannot be used by any taxpayer, for the purpose of avoiding penalties that may be imposed on the taxpayer. The data provided in your question is irrelevant. The data that you provided in the comments (that you're physically present in the US while doing the work) is the only relevant information needed to answer your question. You will need to pay taxes in the US for the earnings. The company invoicing the US client will also need to pay taxes in the US for its earnings from these invoices. You can transfer between bank accounts and deposit whatever you want anywhere you want, no-one cares (with respect to the US taxes, check with Indian tax accountant about Indian requirements). First, the SSN isn't an issue. She will need to apply for an ITIN together with tax filing, in order to file taxes as Married Filing Jointly anyway. I think you (or both of you in the joint case) probably qualify for the Foreign Earned Income Exclusion, if you've been outside the US for almost the whole year, in which cases both of you should have all of your income excluded anyway, so I'm not sure why you're getting that one is better. As for Self-Employment Tax, I suspect that she doesn't have to pay it in either case, because there is a sentence in your linked page for Nonresident Spouse Treated as a Resident that says However, you may still be treated as a nonresident alien for the   purpose of withholding Social Security and Medicare tax. and since Self-Employment Tax is just Social Security and Medicare tax in another form, she shouldn't have to pay it if treated as resident, if she didn't have to pay it as nonresident. From the law, I believe Nonresident Spouse Treated as a Resident is described in IRC 6013(g), which says the person is treated as a resident for the purposes of chapters 1 and 24, but self-employment tax is from chapter 2, so I don't think self-employment tax is affected by this election. With a question like this you should talk to a tax professional who knows about international tax and knows about both the UK and the country you will be working in. They will give you up to date advice on what can be an extremely complex question. However to get you started I'll tell you what I was told when I did this nearly twenty years ago. It's all about whether you are resident in the UK for tax purposes or not. If you are, you will pay UK tax. If not, you wont (assuming you are being paid outside the UK - check with your professional exactly what is involved). In those days you could be counted as 'non resident' if you spent a complete period of twelve months outside the UK. You can make occasional visits to the UK without invalidating that. Again, check exactly how much you are allowed to return while still being not resident. Usually you will have to pay tax in the country where you are resident, but check the rules there. With some skilful timing you may be able to be considered non-resident in bouth countries, at least for some of the time. Again, your tax professional will know. The bank account question - again get a professional. I don't think it's a problem, but you may have to establish that you are being paid in the foreign country. In general you are going to need an account in the country where you work, so if its a problem get paid there and transfer any money you need in the UK.