ISA vs SIPP: What’s the easiest way to make a million?

ISAs and SIPPs both have attractive qualities, but one could greatly improve your chances of making a million.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

If you are serious about saving for the future, then you should be using a tax efficient savings wrapper, such as a SIPP or ISA. Both come with extremely attractive tax benefits for investors but, at the same time, they’re very different products.

SIPPs vs ISAs

First introduced in 1989, SIPPs were initially aimed at self-employed workers that didn’t have access to company pension schemes. Since then, the value of assets within SIPPs has exploded. Today it’s estimated there’s nearly £200bn of investors assets in SIPPs across the UK.

ISAs are also a relatively new invention. Introduced in 1999 by the then chancellor Gordon Brown, ISAs replaced the earlier Personal Equity Plans and Tax-Exempt Special Savings Accounts. In the years since, the product has been refined further with later governments merging Cash and Stocks and Shares ISAs, and introducing a range of new ISA products. 

Compared to SIPPs, ISAs are generally much more flexible. You can put in up to £20,000 a year and withdraw this money whenever you want with no restrictions, as long as you don’t breach the annual limit (rules for Lifetime ISAs are different). 

SIPPs have more stringent rules regarding contributions and withdrawals. Your individual situation will vary, but the general rule is you can deposit 100% of your annual earnings into a SIPP. If you aren’t earning, you can only deposit £2,880 a year. Most providers won’t let you withdraw funds before the age of 55 and, if you do, the tax man will take a large chunk. 

A tax bonus

Despite the lack of flexibility around withdrawals and deposits, the one significant benefit a SIPP has over an ISA is that the government gives tax relief at your marginal rate on any contributions up to £40,000 a year. For a basic rate taxpayer, this means they’ll receive a top-up of 20% on funds deposited.

So, if you want to save £100 a month, you only need to put away £80 and then the government will add £20. Non-earners can deposit a maximum of £2,880 a year, or £3,600 including the tax top-up. This extra tax top-up, in my opinion, makes a SIPP the best vehicle to use if you want to make a million. While the ISA does have its benefits, who can say no to free money?

An immediate return 

The basic rate 20% tax top up means you are effectively receiving an immediate return on your money, a return that will give you a huge helping hand when saving. 

For example, according to my calculations, £100 a month invested in the FTSE 100 via an ISA for 20 years would grow into a savings pot worth £58,300. However, the same £100 a month invested in a SIPP would instantly be worth £125, including the basic rate tax relief, which would grow to be worth just under £73,000 if this monthly contribution was invested in an FTSE 100 tracker, according to my calculations.

This simple example shows why I believe a SIPP is the better product to use if you want to make a million.

Rupert Hargreaves owns no share mentioned. The Motley Fool UK has no position in any of the shares mentioned. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

This way, That way, The other way - pointing in different directions
Investing Articles

As the FTSE indexes sink, these unique dividend shares are making investors money

These two dividend shares are in positive territory for the month and outperforming the major FTSE indexes by a significant…

Read more »

Rolls-Royce's Pearl 10X engine series
Investing Articles

Down 15% in days, are Rolls-Royce shares suddenly a bargain again?

Rolls-Royce shares have been heading south over the past couple of weeks. This writer thinks that makes sense -- but…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

What would a 40-year-old need to put into an empty SIPP to target monthly passive income of £1,000?

From a standing start at 40, how might someone target a four-figure monthly income stream from their SIPP? Christopher Ruane…

Read more »

British flag, Big Ben, Houses of Parliament and British flag composition
Investing Articles

As the ISA deadline approaches, UK investors have the opportunity to buy cheap shares

In recent weeks, equity markets have fallen significantly due to the conflict in the Middle East. As a result, many…

Read more »

Array of piggy banks in saturated colours on high colour contrast background
Investing Articles

£5k left in a Stocks and Shares ISA? 2 top ETFs to consider buying in April

Ben McPoland highlights a pair of very different ETFs that he thinks could help generate long-term wealth inside an ISA…

Read more »

Two business people sitting at cafe working on new project using laptop. Young businesswoman taking notes and businessman working on laptop computer.
Investing Articles

Could a £20,000 ISA end up generating £20,000 of passive income each year?

Could a Stocks and Shares ISA ultimately cover its own cost each year with the passive income it produces? Christopher…

Read more »

A young black man makes the symbol of a peace sign with two fingers
Investing Articles

2 top stocks to consider buying after this week’s FTSE carnage

Investors looking for beaten-up stocks to buy for the long term have a lot of great options after the recent…

Read more »

Smart young brown businesswoman working from home on a laptop
Investing Articles

A stock market crash could be a gift for long-term investors

A stock market crash could present some outstanding buying opportunities. But the key to taking advantage is knowing what to…

Read more »