Dormant company, never paid taxes, never traded in UK - should I have notified the HMRC?
You don't have to register for corporation tax until you start doing business: After you’ve registered your company with Companies House, you’ll need to register it for Corporation Tax. You’ll need to do this within 3 months of starting to do business. Since you haven't needed to do that yet, there also shouldn't be any need to tell HMRC you've stopped trading. So it should just be a question of telling Companies House - I guess it's possible they'll first want you to provide the missing accounts.
You should check this with a tax accountant or tax preparation expert, but I encountered a similar situation in Canada. Your ISA income does count as income in a foreign country, and it is not tax exempt (the tax exemption is only because the British government specifically says so). You would need to declare the income to the foreign government who would almost certainly charge you tax on it. There are a couple of reasons why you should probably keep the funds in the ISA, especially if you are looking to return. First contribution limits are per year, so if you took the money out now you would have to use future contribution room to put it back. Second almost all UK savings accounts deduct tax at source, and its frankly a pain to get it back. Leaving the money in an ISA saves you that hassle, or the equal hassle of transferring it to an offshore account. The LLC (not you) is probably in debt to the California FTB. Any LLC registered in California must pay at least $800 a year, until it is officially dissolved (i.e.: notice of cancellation/dissolution properly filed with the California Secretary of State). The FTB may come after members (including you) personally, if it can prove that the failure to pay was due to your negligence. Talk to a CA-licensed EA/CPA about how to resolve this. Otherwise, at least from what you've described, there were no other taxable events. LLC is a disregarded entity, so the IRS doesn't care about it much anyway (unless someone was stupid enough to elect it to be taxed as a corporation, that is). Keep in mind that when in doubt - you are always better off with a professional (a CPA/EA licensed in your State) advice. You proceed with a proper legal advice. You should not ignore IRS letters. You should have taken your chances in trying to reach a compromise with them, but that ship has likely sailed already. You might want to consider bankruptcy. Ask your parents for a couple of hundreds of dollars to pay for a legal consultation with a lawyer and a CPA and proceed from there. As someone who used to be an IT contractor in the UK and used to work from home, my advice is to talk to your accountant in detail. It's been a few years, but IIRC you can write off some small stuff like proportional heating costs etc, but in my case it was so minuscule that it wasn't worth the effort. You're likely better off to just leave it. <subliminal message> Talk to your accountant :). </subliminal message> My understanding is you can create a company 0 value. Then you need to either loan the company the money to buy the building (it will still have 0 value as it will have a debt equal to it's assets) or sell share to investors at any price you like to raise the money to buy the building.  Once shares have value (as valued by a chartered accountant - not anyone can do this) then anyone recieving shares will have to pay income tax. This is why keeping the shares as no value for as long as possible can be preferable. Also a benefit of using share options. talk to your investors, see what they require. My understanding (I am not a lawyer or tax expert) is that you are not allowed to work for free, but you can pay yourself minimum wage for the hours worked. There are probably National Insurance implications as well but I don't know. The main thing is, though, that if HMRC think that you've set up this system as a tax avoidance scheme then they're allowed to tax you as though all the income had been yours in the first place. If you are considering such a setup I would strongly advise you to hire a qualified small business accountant who will be familiar with the rules and will be able to advise you on what is and is not possible / sensible. Falling outside the rules (even inadvertently) leaves you liable to a lot of hassle and potentially fines etc. In a simple case as the sole UK resident director/shareholder of a company, with that company as your only income, you are usually best paying yourself a salary of the maximum tax free amount allowed under your tax code (~£11k for most people at present).  On this you will have to pay some employer and employee National Insurance (NI) contributions (totalling around £1000). Your salary/employer NI counts as an expense, so that is taken off the company profits.  You then pay corporation tax on the remainder (20%).  The first £5k you take as dividends is tax free, the remainder at a lower tax rate than the equivalent combined income tax/NI (starting at 7.5% instead of 20% tax plus employee plus employer NI), giving a significant saving compared to salaried income even after corporation tax. To declare and pay the tax, you would need to complete a self-assessment tax return.  Your company will also need to file a return. The Contractor UK website, although aimed at IT contractors, has some very useful information on operating Ltd companies. That said, finances are rarely that simple so I would concur with the recommendation you engage an accountant, which is a tax-deductible expense. As 'anonymous' already mentioned, I think the correct answer is to go see an accountant. That said, if you are already have to fill in a tax return anyway (ie, you're already a high rate taxpayer) then I don't see why it should be an issue if you just told HMRC of your additional profit via your tax return. I never was in the situation of being employed with a side business in the UK, only either/or, but my understanding is that registering as self employed is probably more suitable for someone who doesn't PAYE already. I might be wrong on this as I haven't lived in the UK for a couple of years but an accountant would know the answer. Of course in either case, make sure that you keep each an every scrap of paper to do with your side business. The VAT number should be equivalent from the point of view of your client. The fact that you are a sole trader and not a limited liability doesn't matter when it comes down to pay VAT. They should pay the VAT to you and you will pay it to the government. I'll guess that their issue is with tax breaks, it is a bit more tricky to receive a tax break on paid taxes if you buy something abroad (at least it is here in Finland). If they won't pay you because of that, you could open a LTD or contract the services of a 'management company' which will do the job of invoicing, receiving the money and passing it back to you, for a fee. An ISA is a much simpler thing than I suspect you think it is. It is a wrapper or envelope, and the point of it is that HMRC does not care what happens inside the envelope, or even about extractions of funds from the envelope; they only care about insertions of funds into the envelope. It is these insertions that are limited to £15k in a tax year; what happens to the funds once they're inside the envelope is your own business.  Some diagrams: Initial investment of £10k. This is an insertion into the envelope and so counts against your £15k/tax year limit.                 +---------ISA-------+ ----- £10k --------->              |                +-------------------+  So now you have this:                 +---------ISA-------+                |  £10k of cash     |                +-------------------+  Buy fund:                 +---------ISA-------+                |    £10k of ABC    |                +-------------------+  Fund appreciates. This happens inside the envelope; HMRC don't care:                 +---------ISA-------+                |    £12k of ABC    |                +-------------------+  Sell fund. This happens inside the envelope; HMRC don't care:                 +---------ISA-------+                |    £12k of cash   |                +-------------------+  Buy another fund. This happens inside the envelope; HMRC don't care:                 +---------ISA-----------------+                | £10k of JKL & £2k of cash   |                +-----------------------------+  Fund appreciates. This happens inside the envelope; HMRC don't care:                 +---------ISA-----------------+                | £11k of JKL & £2k of cash   |                +-----------------------------+  Sell fund. This happens inside the envelope; HMRC don't care:                 +---------ISA-------+                |    £13k of cash   |                +-------------------+  Withdraw funds. This is an extraction from the envelope; HMRC don't care.                 +---------ISA-------+ <---- £13k ---------               |                +-------------------+  No capital gains liability, you don't even have to put this on your tax return (if applicable) - your £10k became £13k inside an ISA envelope, so HMRC don't care. Note however that for the rest of that tax year, the most you can insert into an ISA would now be £5k:                 +---------ISA-------+ ----- £5k --------->               |                +-------------------+  even though the ISA is empty. This is because the limit is to the total inserted during the year. "The shares are ""imputed income"" / payment in kind. You worked in the UK, but are you a ""US Person""? If not, you should go back to payroll with this query as this income is taxable in the UK. It is important you find out on what basis they were issued. The company will have answers. Where they aquired at a discount to fair market value ? Where they purchased with a salary deduction as part of a scheme ? Where they acquired by conversion of employee stock options ?    If you sell the shares, or are paid dividends, then there will be tax withheld." "That's a tricky question and you should consult a tax professional that specializes on taxation of non-resident aliens and foreign expats. You should also consider the provisions of the tax treaty, if your country has one with the US. I would suggest you not to seek a ""free advice"" on internet forums, as the costs of making a mistake may be hefty. Generally, sales of stocks is not considered trade or business effectively connected to the US if that's your only activity. However, being this ESPP stock may make it connected to providing personal services, which makes it effectively connected. I'm assuming that since you're filing 1040NR, taxes were withheld by the broker, which means the broker considered this effectively connected income." I love the flat rate VAT scheme. It's where you pay a percentage based on your industry. An example might be Computer repair services, where you'll pay 10.5% of your total revenue to the HMRC. But you'll be invoicing for VAT at 20% still. Would definitely recommend registering for it since you're expecting to cross the threshold anyway. And like DumbCoder said, you also get a first year discount of 1%, so in the example above, you'd end up paying 9.5% VAT on your turnover. I personally found it a pain to invoice without VAT (my clients expected it), so registering made sense regardless of the fact I was over threshold. The tricky bit is keeping under the £150k turnover so you stay eligible for the flat rate. It does get more complex otherwise. Ugh. Really? I thought this subreddit was smarter than this.   1) You pay taxes on net income, not sales. Expenses are tax deductible.   2) This took place in the UK, which operates on a different set of tax rules than many of us are familiar with.  3) The company still pays other taxes even if they don't pay income tax. In the US, examples would be payroll taxes including the employer portion of things like SS and Medicare, but I'm sure the UK has similar programs funded in a similar manner. To the extent that they own their buildings, they also pay property taxes. They globally source their supplies, which means they also pay import taxes. There are a ton of other taxes that a company pays.  4) Tax laws are complex because business is complex.   Inflammatory headlines like this serve no purpose whatsoever. Not sure about the UK, but if it were in the US you need to realize the expenses can be claimed as much as the income. After having a mild heart attack when I did my business taxes the first time many years ago, a Small Business Administration adviser pointed it out. You are running the site from a computer?  Deductible on an amortization schedule.  Do you work from home?  Electricity can be deducted.  Do you drive at all?  Did you pay yourself a wage?  Any paperwork, fax communications, bank fees that you had to endure as work expenses? I am not an accountant, but chances are you legally lost quite a bit more than you made in a new web venture.  Discuss it with an accountant for the details and more importantly the laws in your country.  I could be off my rocker.