When to fill an ISA before topping up a workplace pension

Clients often ask whether the next £5,000 of spare income should go into a Stocks & Shares ISA or into a workplace pension. The honest answer depends on when you may need the money and how much employer matching you would forfeit.

Liquidity versus relief

Pension contributions usually attract income tax relief and, in many schemes, employer matching. That combination is hard to beat for money you will not touch until mid-life. An ISA offers no upfront relief for basic-rate taxpayers in the same way, but withdrawals arrive without the pension tax rules that apply later.

If your employer matches 5% and you have not yet claimed that match, topping the pension first is usually the stronger move. If the match is already maxed and you expect a house deposit within three years, the ISA often wins on access alone.

Higher-rate wrinkles

Additional-rate taxpayers should check whether pension annual allowance tapering applies before automatic large contributions. We have seen directors overfund a SIPP in a high-earnings year, then face an unexpected tax charge. An ISA contribution in that year can be the quieter choice while allowance questions are sorted with your accountant.

A simple order of operations

1. Capture any employer pension match you would otherwise lose.
2. Clear expensive consumer debt that outruns expected investment returns.
3. Use remaining capacity across ISA and pension according to when you need the cash.
4. Revisit the split each tax year — allowances and salaries change.

Bring both your pension statement and ISA valuation to a planning review if you want the order written specifically for your household.