US ISA equivalent for tax exempt investment & savings
As far as I know, there is no direct equivalent. An IRA is subject to many rules.  Not only are there early withdrawal penalties, but the ability to deduct contributions to an IRA phases out with one's income level.  Qualified withdrawals from an IRA won't have penalties, but they will be taxed as income.  Contributions to a Roth IRA can be made post-tax and the resulting gains will be tax free, but they cannot be withdrawn early. Another tax-deductable investment is a 529 plan.  These can be withdrawn from at any time, but there is a penalty if the money is not used for educational purposes. A 401K or similar employer-sponsored fund is made with pre-tax dollars unless it is designated as a Roth 401K.  These plans also require money to be withdrawn specifically for retirement, with a 10% penalty for early withdrawal.  Qualifying withdrawals from a regular retirement plan are taxed as income, those from a Roth plan are not (as with an IRA). Money can be made harder to get at by investing in all of the types of funds you can invest in using an IRA through the same brokers under a different type of account, but the contribution will be made with post-tax, non-deductable dollars and the gains will be taxed.
"It sounds like this is an entirely unsettled question, unfortunately.  In the examples you provide, I think it is safe to say that none of those are 'substantially identical'; a small overlap or no overlap certainly should not be considered such by a reasonable interpretation of the rule. This article on Kitces goes into some detail on the topic.  A few specifics. First, Former publication 564 explains: Ordinarily, shares issued by one mutual fund are not considered to be substantially identical to shares issued by another mutual fund. Of course, what ""ordinarily"" means is unspecified (and this is no longer a current publication, so, who knows). The Kitces article goes on to explain that the IRS hasn't really gone after wash sales for mutual funds: Over the years, the IRS has not pursued wash sale abuses against mutual funds, perhaps because it just wasn’t very feasible to crack down on them, or perhaps because it just wasn’t perceived as that big of an abuse. After all, while the rules might allow you to loss-harvest a particular stock you couldn’t have otherwise, it also limits you from harvesting ANY losses if the overall fund is up in the aggregate, since losses on individual stocks can’t pass through to the mutual fund shareholders. But then goes to explain about ETFs being very different: sell SPY, buy IVV or VTI, and you're basically buying/selling the identical thing (99% or so correlation in stocks owned).   The recommendation by the article is to look at the correlation in owned stocks, and stay away from things over 95%; that seems reasonable in my book as well. Ultimately, there will no doubt be a large number of “grey” and murky situations, but I suspect that until the IRS provides better guidance (or Congress rewrites/updates the wash sale rules altogether!), in the near term the easiest “red flag” warning is simply to look at the correlation between the original investment being loss-harvested, and the replacement security; at correlations above 0.95, and especially at 0.99+, it’s difficult to argue that the securities are not ”substantially identical” to each other in performance. Basically - use common sense, and don't do anything you think would be hard to defend in an audit, but otherwise you should be okay." A CDIC-insured high-interest savings bank account is both safe and liquid (i.e. you can withdraw your money at any time.)  At present time, you could earn interest of ~1.35% per year, if you shop around. If you are willing to truly lock in for 2 years minimum, rates go up slightly, but perhaps not enough to warrant loss of liquidity. Look at GIC rates to get an idea. Any other investments – such as mutual funds, stocks, index funds, ETFs, etc. – are generally not consistent with your stated risk objective and time frame. Better returns are generally only possible if you accept the risk of loss of capital, or lock in for longer time periods. 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 main difference is that the ISA account like a Cash ISA shelters you from TAX - you don't have to worry about Capital Gains TAX. The other account is normal taxable account. With only £500 to invest you will be paying a high % in charges so... To start out I would look at some of the Investment Trust savings schemes  where you can save  a small amount monthly very cost-effectively - save £50 a month for a year to see how you get on. Some Trusts to look at include Wittan, City Of London and Lowland 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. "In a Roth IRA scenario, this $5,000 would be reduced to $3,750 if we assume a (nice and round) 25% tax rate. For the Traditional IRA, the full $5,000 would be invested. No, that's not how it works.  Taxes aren't removed from your Roth account.  You'll have $5,000 invested either way.  The difference is that you'll have a tax deduction if you invest in a traditional IRA, but not a Roth. So you'll ""save"" $1,250 in taxes up front if you invest in a traditional IRA versus a Roth. The flip side is when you withdraw the money.  Since you've already paid tax on the Roth investment, and it grows tax free, you'll pay no tax when you withdraw it.  But you'll pay tax on the investment and the gains when you withdraw from a traditional IRA.  Using your numbers, you'd pay tax on $2.2MM from the traditional IRA, but NO TAX on $2.2MM from the Roth. At that point, you've saved over $500,000 in taxes. Now if you invested the tax savings from the traditional IRA and it earned the same amount, then yes, you'd end up in the same place in the end, provided you have the same marginal tax rate.  But I suspect that most don't invest that savings, and if you withdraw significant amount, you'll likely move into higher tax brackets. In your example, suppose you only had $3,750 of ""discretionary"" income that you could put toward retirement.  You could put $5,000 in a traditional IRA (since you'll get a $1,250 tax deduction), or $3,750 in a Roth.  Then your math works out the same.  If you invest the same amount in either, though, the math on the Roth is a no-brainer." when investing in index funds Index fund as the name suggests invests in the same proportion of the stocks that make up the index. You can choose a Index Fund that tracks NYSE or S&P etc. You cannot select individual companies. Generally these are passively managed, i.e. just follow the index composition via automated algorithms resulting in lower Fund Manager costs. is it possible to establish an offshore company Yes it is possible and most large organization or High Net-worth individuals do this. Its expensive and complicated for ordinary individuals. One needs and army of International Tax Consultants / International Lawyers / etc but do I have to pay taxes from the capital gains at the end of the year? Yes Canada taxes on world wide income and you would have to pay taxes on gains in Canada. Note depending on your tax residency status in US, you may have to pay tax in US as well. Note that after 15 years, the tax exemption is €36800 per person, which includes both the principal you desposited and the accumulated interest.  It's possible that you will have a higher balance than this in your savings account at this point and would still owe tax on the interest accumulated above the exempted amount.  After 20 years, you get the full tax exemption, the lesser of your portion of the mortgage debt and €162000 per person. In direct answer to your questions: I'm not aware of any exceptions to the 15 year rule for allowing the accumulated interest to be tax free when selling your house.  If your accumulated interest is low enough, you might consider just paying the tax on it as it would give you the most flexibility in choosing a new mortgage.  This is why I asked about more details about your interest rate and how long the mortgage has been running. It may, however, possible to couple the savings account to a new ABN AMRO Bankspaar mortgage when you buy a new house.  You should check your mortgage terms and conditions.  For example, Section 23.12 in ABN AMRO's terms and conditions from 2010 describes this.  See here.  It is probably best, however, to speak directly with either your mortgage broker or with a mortgage adviser with ABN AMRO.  If your mortgage broker still worked on commission (aflsuitprovisie) when you closed your mortgage, then they are obligated to assist you with this type of question. In order to qualify for the tax exemption, you must use the saved value to pay off debt on your primary residence (eigenwoningschuld).  Decoupling the savings account entirely from a mortgage will disqualify you from the tax advantages.  You will owe tax on all accumulated interest. Your question is actually quite broad, so will try to split it into it's key parts: Yes, standard bank ISAs pay very poor rates of interest at the moment. They are however basically risk free and should track inflation.  Any investment in the 6-7% return range at the moment will be linked to stock. Stock always carries large risks (~50% swings in capital are pretty standard in the short run. In the long run it generally beats every other asset class by miles). If you can’t handle those types of short terms swings, you shouldn’t get involved. If you do want to invest in stock, there is a hefty ignorance tax waiting at every corner in terms of how brokers construct their fees. In a nutshell, there is a different best value broker in the UK for virtually every band of capital, and they make their money through people signing up when they are in range x, and not moving their money when they reach band y; or just having a large marketing budget and screwing you from the start (Nutmeg at ~1% a year is def in this category). There isn't much of an obvious way around this if you are adamant you don't want to learn about it - the way the market is constructed is just a total predatory minefield for the complete novice. There are middle ground style investments between the two extremes you are looking at: bonds, bond funds and mixes of bonds and small amounts of stock (such as the Vanguard income or Conservative Growth funds outlined here), can return more than savings accounts with less risk than stocks, but again its a very diverse field that's hard to give specific advice about without knowing more about what your risk tolerance, timelines and aims are. If you do go down this (or the pure stock fund) route, it will need to be purchased via a broker in an ISA wrapper. The broker charges a platform fee, the fund charges a fund fee. In both cases you want these as low as possible. The Telegraph has a good heat map for the best value ISA platform providers by capital range here. Fund fees are always in the key investor document (KIID), under 'ongoing charges'. "The IRS rules are actually the same.  26 U.S. Code § 1091 - Loss from wash sales of stock or securities In   the case of any loss claimed to have been sustained from any sale or   other disposition of shares of stock or securities where it appears   that, within a period beginning 30 days before the date of such sale   or disposition and ending 30 days after such date, the taxpayer has   acquired (by purchase or by an exchange on which the entire amount of   gain or loss was recognized by law), or has entered into a contract or   option so to acquire, substantially identical stock or securities,   then no deduction shall be allowed... What you should take away from the quote above is ""substantially identical stock or securities."" With stocks, one company may happen to have a high correlation, Exxon and Mobil come to mind, before their merger of course. With funds or ETFs, the story is different. The IRS has yet to issue rules regarding what level of overlap or correlation makes two funds or ETFs ""substantially identical.""  Last month, I wrote an article, Tax Loss Harvesting, which analyses the impact of taking losses each year. I study the 2000's which showed an average loss of 1% per year, a 9% loss for the decade. Tax loss harvesting made the decade slightly positive, i.e. an annual boost of approx 1%." Your 1&2 are the end of that chapter. You can't convert for that year again, and must wait 30 days to convert in the new tax year.  For example, each year for over a decade, I've helped my mother in law with this. In May, we convert a chunk of money/stock to Roth. In April, I'll recharacterize just enough so she tops off her 15% bracket but doesn't hit 25%. 30 days later, the new conversion happens. All the Roth money is money now taxed at 15%, which, in an emergency, a need for a lot of cash, will avoid the potential of 25% or higher, tax. You see, your 3 never really happens. "Nobody knows for sure what ""substantially identical"" means because the IRS hasn't officially defined it. Until they do so, it would come down to the decision of an auditor or a tax court. The rule of thumb that I have always heard is if the funds track the same index, they are probably substantially identical. I think most people wouldn't consider any pair of AGG, CMF, and NYF to be substantially identical, so you should be safe with your tax-loss harvesting strategy." "Not sure what your needs are or what NIS is:  However here in the US a good choice for a single fund are ""Life Cycle Funds"". Here is a description from MS Money: http://www.msmoney.com/mm/investing/articles/life_cyclefunds.htm" Good question - I know you can keep the ISA in the UK and it won't lose its tax free status but you're not able to contribute it while you're not a UK resident. Not that its tax free status buys you that much if you're a non-resident as you could apply to receive tax gross on pretty much any savings account anyway. Given that the idea of tax-free saving outside a retirement account doesn't really exist here in the US I would assume that you will have to declare the interest as income and, if you don't pay any other taxes in the UK that would cover the amount you'd have to pay on your ISA under the foreign tax credit, you'd end up giving the IRS their pound of flesh. As I mentioned in an answer to a previous question, you really need to talk to an US accountant/CPA, preferably one that is familiar with UK taxation law as well. "There are two different types of ISA; the ""Cash ISA"" for cash savings, and the ""Stocks and Shares ISA"" for stock market investing.  You can transfer funds between these two different types of ISA.  If your current cash ISA provider does not provide stocks and shares ISAs, then there may be a fee involved when transferring funds between two different providers. If I am reading your notation correctly, you have contributed the full allowance of GBP15,240 in both the current tax year and the previous tax year.   Each year you can contribute GBP15,240 (currently) to your ISAs and this can be done in any combination of cash ISA and stocks and shares ISA.  For example, you could put GBP5,240 into your cash ISA and GBP10,000 into your stocks and shares ISA. Regarding your questions : It is also important to understand that once you withdraw money from an ISA, it does not affect your previous contributions or allowances.  For example, if you have used your full contribution allowance for the current year and chose to withdraw some funds, then you have still used your full contribution allowance and so you cannot redeposit these funds."