Buying shares- Stocks & Shares ISA, or Fund & Share 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
Cost basis is irrelevant because the entire distribution is taxed as ordinary income even if the custodian distributes stock or mutual fund shares to you. Such distributions save you the brokerage fees that you would incur had you taken a cash distribution and promptly bought the shares outside the retirement account for yourself but they have no effect on the tax treatment of the distribution: the market value of the shares distributed to you is taxed as ordinary income, and your basis in the newly acquired shares outside the retirement account is the market value of the shares, all prices being as of the date of the distribution. "You're talking about money in a savings account, and avoiding the risks posed by an ongoing crisis, and avoiding risk. If you are risk-averse, and likely to need your money in the short term, you should not put your money in the stock market, even in ""safe"" stocks like P&G/Coca-Cola/etc. Even these safe stocks are at risk of wild price swings in the short- to intermediate-term, especially in the event of international crises such as major European debt defaults and the like. These stocks are suitable for long-term growth objectives, but they are not as a replacement for a savings account. Coca-Cola lost a third of its value between 2007 and 2009. (It's recovered, and is currently doing better than ever.) P&G went from $74/share to $46/share. (It's partially recovered and back at $63). On the other hand, these stocks may indeed be suitable as long-term investments to protect you against local currency inflation. And yes, they even pay dividends. If you're after this investment, a good option is probably a sector-specific exchange-traded fund, such as a consumer-staples ETF. It will likely be more diversified and safer than anything you could come up with using a list of individual stocks. You can also investigate recommendations that show up when you search for a ""defensive ETF"". If you do not wish to buy the ETF directly, you can also look at listings of the ETF's holdings. Read the prospectus for an idea of the risks associated with these funds. You can buy these funds with any brokerage that gives you access to US stock exchanges." "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." A mutual fund has several classes of shares that are charged different fees. Some shares are sold through brokers and carry a sales charge (called load) that compensates the broker in lieu of a fee that the broker would charge the client for the service.  Vanguard does not have sales charge on its funds and you don't need to go through a broker to buy its shares; you can buy directly from them.  Admiral shares of Vanguard funds are charged lower annual expenses than regular shares (yes, all mutual funds charge expenses for fund adninistration that reduce the return that you get, and Vanguard has some of the lowest expense ratios) but Admiral shares are available only for large investments, typically $50K or so.  If you have invested in a Vanguard mutual fund, your shares can be set to automatically convert to Admiral shares when the investment reaches the right level. A mutual fund manager can buy and sell stocks to achieve the objectives of the fund, so what stockes you are invested in as a share holder in a mutual fund will typically be unknown to you on a day-to-day basis.  On the other hand, Exchange-traded funds (ETFs) are fixed baskets of stocks, and you can buy shares in the ETF.  These shares are bought and sold through a broker (so you pay a transaction fee each time) but expenses are lower since there is no manager to buy and sell stocks: the basket is fixed. Many ETFs follow specific market indexes (e.g. S&P 500).  Another difference between ETFs and mutual funds is that you can buy and sell ETFs at any time of the day just as if you could if you held stocks. With mutual funds, any buy and sell requests  made during the day are processed at the end of the day and the value of the shares that you buy or sell is determined by the closing price of the stocks held by the mutual fund.  With ETFs, you are getting the intra-day price at the time the buy or sell order is executed by your broker. I assume that with both companies you can buy stock mutual funds, bonds mutual funds, ETFs and money market accounts. They should both offer all of these as IRAs, Roth IRAs, and non-retirement accounts.  You  need to make sure they offer the types of investments you want. Most 401K or 403b plans only offer a handful of options, but for non-company sponsored plans you want to have many more choices. To look at the costs see how much they charge you when you buy or sell shares. Also look at the annual expenses for those funds. Each company website should show you all the fees for each fund. Take a few funds that you are likely to invest in, and have a match in the other fund family, and compare. The benefit of the retirement accounts is that if you make a less than perfect choice now, it is easy to move the money within the family of funds or even to another family of funds later. The roll over or transfer doesn't involve taxes. There's really no right or wrong answer here because you'll be fine either way. If you've investing amounts in the low 5 figures you're likely just getting started, and if your asset allocation is not optimal it's not that big a deal because you have a long time horizon to adjust it, and the expense ratio differences here won't add up to that much. A third option is Vanguard ETFs, which have the expense ratio of Admiral Shares but have lower minimums (i.e. the cost of a single share, typically on the order of $100). However, they are a bit more advanced than mutual funds in that they trade on the market and require you to place orders rather than just specifying the amount you want to buy. A downside here is you might end up with a small amount of cash that you can't invest, since you can initially only buy whole numbers of ETFs shares. So what I'd recommend is buying roughly the correct number of ETFs shares you want except for your largest allocation, then use the rest of your cash on Admiral Shares of that (if possible). For example, let's say you have $15k to invest and you want to be 2/3 U.S. stock, 1/6 international stock, and 1/6 U.S. bond. I would buy as many shares of VXUS (international stock ETF) and BND (U.S. bond ETF) as you can get for $2500 each, then whatever is left over (~$10k) put into VTSAX (U.S. stock Admiral Shares mutual fund). I don't think it has to be either-or. You can profitably invest inside the SIMPLE. (Though I wouldn't put in any more than the 1% it takes to get the match.) Let's look at some scenarios. These assume salary of $50k/year so the numbers are easy. You can fill in your own numbers to see the outcome, but the percentages will be the same. Let it sit in cash in the SIMPLE. You put in 1%, your employer matches with 1%. Your account balance is $1,000 (at the end of the year), plus a small amount of interest. Cost to you is $500 from your gross pay. 100% return on your contributions, yay! Likely 0-1% real returns going forward; you'll be lucky to keep up with inflation over the long term. Short term not so bad. Buy shares of index ETFs in the SIMPLE; let's assume the fee works out to 10%. You put in 1%, employer matches 1%. Your contributions are $500, fees are $100, your balance is $900 in ETFs. 80% instant return, and possible 6-7% real long term returns going forward. Buy funds in the SIMPLE; assume the load is 5%, management fee is 1% and you can find something that behaves like an index fund (so it is theoretically comparable to above). 1% from you, 1% from employer. Your contributions are $500, load fees are $50, your balance is $950. 90% instant return, and possible 5-6% real long term returns going forward (assuming the 6-7% real returns of equities are reduced by the 1% management fee). (You didn't list out the fees, and they're probably different for the different fund choices, so fill in your own details and do the math.) Invest outside the SIMPLE in the same ETFs or equivalent no load index funds; let's assume you can do this with no fees. You put in the same 1% of your gross (ignoring any difference that might come from paying FICA) into a self directed traditional IRA. At the end of the year the balance is $500. So deciding whether or not to take the match is a no brainer: take it. Deciding whether you should hold cash, ETFs, or (one of two types of) funds in your SIMPLE is a little trickier. As you are in UK, you should think in terms of Tax Free (interest and accumulated capital gains) ISA type investments for the long term AND/OR open a SIPP (Self Invested Pension Plan) account where you get back the tax you have paid on the money you deposit for your old age. Pensions are  the best bet for money you do not need at present while ISAs are suitable for short term 5 years plus  or longer.