ISAs and SIPPs are the building blocks of FI wealth.

This is part six of a series on how to maximise your ISAs and SIPPs to achieve financial independence (FI).

I put this series on hold when coronavirus gripped the world but it doesn’t look like the pandemic is disappearing any time soon.

Life marches on so let’s pick up where we left off.

Where was that exactly?

Right here:

  • Part one laid out why you need to juggle your ISAs and SIPPs if you’re to retire early.
  • Part two investigated why the tax breaks favour personal pensions over ISAs.
  • Part three showed the simplest way to divide your stash between your ISA and SIPP.
  • Part four dealt with choosing a separate sustainable withdrawal rate (SWR) for your ISA and your SIPP.
  • Part five walked through the entire FI calculation incorporating age, income, outgoings, tax, time horizon, SWR, expected returns, investment fees, and access to the State Pension and defined benefit pensions. (This one nearly killed me!)

The final part of this series deals with a very specific part of the puzzle.

How do you bridge the gap between living off your ISA and finally cracking open your SIPP at age 55 or later?

Minimum pension age blow – Since we started this series, the government has confirmed that the earliest age from which we can access our personal pensions will rise from 55 to 57 in 2028. Thereafter, your minimum pension age will be set 10 years before your State Pension age. If you’re born after 31 Dec 1972 then you’ll definitely fall into the 57-year old camp. If you’re born after 6 April 1978 then your minimum pension age will be 58. Others could still be caught up in government fiddling but they’ve yet to make their plans clear for transitioning age groups onto the new terms for personal pensions or the State Pension.

Part 4 in our series showed that you can choose a sustainable withdrawal rate (SWR) of 8% to bridge a ten year gap between living from your ISA and the arrival of your pension reinforcements. If the gap is wider then the SWR goes downhill pretty quickly.

But what if your gap is shorter than ten years? Then it gets much riskier to fund your living expenses from a portfolio of volatile equities because you’re more exposed to the chance that asset values could slump. You’re a forced seller because you have to pay the bills regardless. This can end up driving your ISA portfolio off a cliff before your pension comes on-stream.

This graph from the Barclays Equity Gilt 2020 study illustrates the volatility problem:

A graph of max and min returns for UK equities, gilts and cash

The range of annual returns for UK assets is wide over any period of less than a decade. We can see that equities are the asset most likely to deliver a positive average return over 20 years or more. But they can smash you with a -60% loss (or worse) in any given year.

Even over ten years, average real returns can be negative. This means we can’t risk funding our lifestyle from a portfolio of 100% equities – they’re just too volatile. It’s this volatility that conjures up the dreaded sequence of returns risk.

See part 4 for asset allocations that are better suited to shorter time horizons.

Note that while the range of outcomes increases for periods under ten years, cash is much less risky, as you might expect.

Liability matching

The alternative to paying your bills using a portfolio of volatile assets – including a hefty slug of equities – is to pay them using a portfolio of low volatility assets that don’t include equities.

In a nutshell, you predict what your annual expenses (or liabilities) will be for the ISA bridge period. Then you save enough low volatility assets (cash and bonds) to pay off those liabilities…

Year Liabilities Savings match
1 £25,000 £25,000
2 £25,000+inflation £25,000+inflation

… and so on, matching low risk assets to liabilities for every year you need to fund.

The FI capital you need to save is the sum of your future expenses, adjusted for growth and inflation.

Now, you may be thinking that predicting your future expenses and inflation is a tall order. However we take the same punt when creating any financial independence plan.

The reality is we need to build in plenty of margin for error – and to hold off pulling the trigger if life deals us a bad hand along the way.

The ideal liability-matching solution is to build a ladder of individual index-linked1 bonds (also affectionately known as linkers).

If your expenses were £25,000 (in today’s money) and year one of your retirement was scheduled for 2030, then you’d buy a linker that matures in 2030 and pays you back an inflation adjusted £25,000.

Holding the individual linker to maturity means you wouldn’t be exposed to a capital loss, while its RPI-linked payout staves off alarming reductions in purchasing power.2

The next linker in your ladder would pay out in 2031, the next in 2032, and so on. Your last maturing bond finances your final year before pension day.

This is the safest way to match future liabilities because index-linked bonds (or gilts) are backed by the government.

The problem is a linker ladder is extremely expensive.

Index-linked gilts are currently paying negative yields. You lose money on them every year if you hold them to maturity. Their yields have only worsened for years. There may even be a structural problem with the UK linker market.

The upshot is that few of us can afford to pay for our future using an asset yielding -3% or more per year.

The next best alternative for ordinary investors is cash.3

Bridging the pension gap with cash

Cash isn’t typically prey to huge swings in value. It often does okay inflation as you can switch to higher yielding accounts pretty quickly.

You can stuff plenty of it in your ISAs and use your personal savings allowance to ward off tax, too.

Go cash!

A liability matching strategy means that our SWR-based FI calculation doesn’t apply, and you could save the required cash more rapidly than you can build an investment portfolio.

The following example shows how you can calculate whether cash is the better option for your ISA bridge.

If we need £25,000 per year for ten years using an 8% SWR, then our FI capital requirement equals:

£25,000 / 0.08 (8% SWR) = £312,500 stash needed.

But this isn’t the case if we meet our £25,000 per year liability out of cash.

Our cash ladder (in today’s money) is the sum of our liabilities adjusted for expected inflation:

Year Liabilities (£)
1 25,000
2 25,750
3 26,522
4 27,318
5 28,137
6 28,981
7 29,851
8 30,746
9 31,669
10 32,619
Total FI capital 286,597

Assuming expected inflation of 3% p.a.

Ten years of retirement starting tomorrow would cost us £286,597 in cash money. That bakes in an annual inflation rate of 3%,4 so that the equivalent of our £25,000 liability in year ten is £32,619.

I should factor in an estimate for the interest we’ll earn, too, but I won’t. Let any interest be our wiggle room in case expenses are more than anticipated.

The USP of £286,597 is clearly that it’s much less than the £312,500 involved in the SWR strategy.

  • So how quickly can we save our grand total?
  • How do we account for the fact that we’ll need more than £25,000 per annum in X years to deal with the money-withering inflation we’ll experience as we save?
  • Where did that 3% inflation assumption come from?

We walked through the calculation for accumulating your FI capital in part five.

Here’s how to adjust for cash:

In this example, the part five calculation reveals we should sock away £1,446 per month into our ISA.

To estimate how long it will take us to transform £1,446 per month into our FI stash of £286,547, we turn to the How Long Investment Calculator from Candid Money. (Other investment calculators are available.)

How long it takes to save FI capital of £286547

Target sum = FI capital figure: £286,547 in this case.

Monthly saving = £1,446 derived from the part 5 income layer cake calculation.

Annual investment return = A downbeat assessment of how much interest we’ll earn from cash over our saving period.

Annual charge = 0%. I trust you use fee-free cash accounts?

Are you a taxpayer? = Non-taxpayer, as savings will be sheltered in ISA or by the Personal Savings Allowance.

Annual inflation rate = 3% based on Bank of England implied inflation forward curve. See the expected inflation section below.

The result = 20 years to reach the target after inflation (in reality we’d need to adjust our contributions and the target sum in line with inflation every year).

Notably, it only takes 14 years to accumulate the £312,500 required by the SWR strategy, with £1,446 per month stocks and shares ISA contributions and the following assumptions:

  • Expected real return of 4%
  • Investment fees of 0.5%

So I’d stick to the SWR strategy in this case.

The situation swings in favour of cash when the ISA bridge period is seven years or less.

You’d only need £191,561 in today’s money to bridge a seven year gap using the cash ladder figures above.

How long it takes to save FI capital of £191,561

Now it will (hopefully!) take just 12.5 years to reach the target sum.

We don’t have any data to show that a higher SWR is viable for volatile investment portfolios that only need to last seven years instead of ten.

If investing instead of saving cash, I’d still accumulate the full £312,500 given the wild range of possible outcomes over short periods. The ISA portfolio should outlive the seven year time-frame and I can use what’s left to spend more on fun things once I’m living it up on my pension.

Personally I’d likely go for the liability matching option, though, because it’s quicker and safer.

The trade-offs we need to think about are:

  • It’s quicker to save the cash needed for the liability matching portfolio.
  • You’re much less vulnerable to sequence of returns risk – both as you accumulate the money and also when you spend it.
  • You’re somewhat vulnerable to inflation risk.
  • The capital is likely to be entirely spent at the end of the bridging period.
  • Without equities there’s little chance of upside, but there’s also much less chance of a catastrophic downside, too.

At the eight year mark, with these assumptions, it’s a total toss up, especially given the uncertainties inherent in this planning process.

On assumptions – I’ve used reasonably conservative ones throughout the series. You can always be more cautious. And you can never be absolutely safe. The more money you save, and the less you spend, and the safer you will be. But the longer it will take you to get there, the less time you will have left.

To shoot for the £312,500 target in 14 years with an expected return of 4% means taking on a lot of equity risk. You don’t face that risk with a cash liability-matching strategy.

Before we’d access our £312,500 ten-year ISA portfolio, we would lower our equity allocation to reduce our exposure to major market crashes that we do not have time to recover from. The potential upside from a large dose of equities is just not worth the risk of running out of money.

Part four of the series shows that the highest historical success rates for time periods of less than 20 years were achieved with global equity asset allocations of around 30%.

That’s in complete contrast to the 80% equity portfolios – they proved most successful over time horizons of 30 years or more.

Expected inflation assumption

My inflation assumption uses the UK instantaneous implied inflation forward curve published by the Bank of England:

An expected inflation curve from the Bank of England

The curve shows inflation hovering around 3% in 15 years, which is approximately the time our example liability-matching cash goes into action. Inflation then dips under 2.5%, ten years further down the curve.

My crude eyeballing plus a dose of pessimism therefore conjures up an annual inflation rate of 3% for the purposes of planning.

The BoE derives the curve (to massively simplify) from the difference between conventional gilt yields and index-linked gilt yields. This theoretically gives us the bond market’s inflation expectations over time, because conventional gilt yields factor in a premium over real yields to compensate for inflation risk.

Nobody is saying that this measure is a dead ringer for future inflation!

It’s just the market’s best guess right now.

The end of the road

I think we’ve covered every important aspect of combining your ISAs and SIPPs to reach financial independence somewhere in this series.

Although there’s much more to say about achieving and managing FI, I’ll now draw this six-parter to a close unless anybody needs anything else covered. Let me know in the comments.

Take it steady,

The Accumulator

Bonus appendix: How much?

I’ve assumed all cash savings are protected by ISAs / the PSA so there’s no need to scale up the FI capital required to account for tax levied on any interest.

The £20,000 annual ISA limit allows for a max monthly contribution of £1,666.

The Personal Savings Allowance further allows basic-rate taxpayers to shelter:

£1,000 / 0.012 = £83,333 tax-free at 1.2% interest.

Higher-rate taxpayers can shelter:

£500 / 0.012 = £41,666 tax-free at 1.2% interest.

Remember to adjust your SWR for investment fees and taxes as shown in part 5.

If you want to adjust down a little more due to the prospect of prolonged negative yields on bonds and negative interest rates then I wouldn’t blame you.

Data can only get us so far. You’ll need to take a personal call on how bullet-proof you want your plan to be from the outset versus adapting it later.

  1. That is, a return that keeps the value of your investment unchanged in real terms after a particular measure of inflation.
  2. Subject to your personal rate of inflation roughly approximating RPI.
  3. The best case scenario would be the government releasing National Savings index-linked certificates back on to the market, but it won’t. It’s much cheaper for the government to fund debt in a market prepared to buy index-linked gilts at negative yields than to pay ordinary UK citizens even a CPI +0% rate of interest.
  4. Multiply year one’s £25,000 by 1.03, multiply year two by 1.03 etc.

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