3 reasons why I’d invest £500 per month in a Stocks and Shares ISA in 2020 See all posts by Peter Stephens Simply click below to discover how you can take advantage of this. Peter Stephens | Tuesday, 7th January, 2020 “This Stock Could Be Like Buying Amazon in 1997” Our 6 ‘Best Buys Now’ Shares I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee. Investing regularly in a Stocks and Shares ISA in 2020 could improve your long-term financial prospects. With there being numerous buying opportunities available at the present time, it may enable you to capitalise on favourable risk/reward opportunities in a tax-efficient manner.Furthermore, investing regularly could allow you to take advantage of potential short-term declines in the stock market at a time when there are numerous risks facing the world economy. As such, now could be the right time to start investing £500, or any other amount, on a monthly basis in equities.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…Buying opportunitiesWhile the FTSE 100 may have delivered a total return of 16% in 2019, it continues to offer good value for money. For example, it has a dividend yield of around 4.3% at the present time. This is higher than its long-term average and suggests that it offers a wide margin of safety.Furthermore, many of the FTSE 100’s members currently trade on favourable valuations. Sectors such as retail and banking have been cheap for some time, and history shows that buying high-quality stocks at low prices can lead to high returns in the long run.As such, capitalising on favourable valuations across the FTSE 350 could be a sound move. A simple means of achieving this goal is to set up a regular investment each month that enables you to gradually build a portfolio of shares that is capable of providing a nest egg in the long run.Risk factorsAlthough now could be the right time to buy a range of stocks, a variety of risks facing the world economy means that short-term volatility could be high. For example, Brexit, geopolitical risks in the Middle East and a global trade war could cause share prices to experience a period of uncertainty during 2020.By investing regularly you may be able to take advantage of short-term challenges to buy companies while they offer wide margins of safety. Although this may not feel like a logical response to falling share prices, history shows that indexes such as the FTSE 100 have always recovered from their downward moves to post higher highs.Tax efficiencyA Stocks and Shares ISA is a simple means of investing tax efficiently. It means that an investor can avoid capital gains, income and dividend tax on the investments they hold within their ISA. In the long run, this can significantly reduce your tax bill – especially if you rely on your portfolio for an income at a time when the dividend allowance is just £2,000 per year.The low cost and simplicity of a Stocks and Shares ISA means that it is a straightforward means to maximise your net returns. As such, now could be a good time to open one and start investing. I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. Enter Your Email Address Image source: Getty Images.