Thanks, you were right, I was using 20% instead of 25%. It's better, but it still doesn't quite add up:
Salary/pension contribution figures are rounded for simplicity, and this is using the 2024/25 Tax Year on the Salary Calculator website:
Scenario 1 – At Source Tax Relief
Gross Salary | £50,000 |
Employee Pension Contribution | £6,600 per year / £550 per month |
Tax Relief at source @ 25% | £1,650 per year / £137.50 per month |
Total for the above | £8,250 per year / £687.50 per month |
Qualified Earnings (between £6,240 and £50,270) | £43,760 |
Employer Pension Contributions @ 3% of the above | £1,312.80 per year / £109.40 per month |
Total pension contributions | £9,562.80 per year / £796.90 per month |
Take-home pay after tax, NI, and pension | £34,239.60 per year / £2,853.31 per month |
Scenario 2 – Salary Sacrifice
Gross Salary | £50,000 |
Employee Pension Contribution | £8,250 per year / £687.50 per month |
Qualified Earnings (less Salary Sacrifice, between £6,240 and £50,270) | £35,510 |
Employer Pension Contributions @ 3% of the above | £1,065.30 per year / £88.78 per month |
Total pension contributions | £9,315.30 per year / £776.28 per month |
Take-home pay after tax and NI using Salary Sacrifice | £33,579.60 per year / £2,798.31 per month |
So, under salary sacrifice, my annual pension contributions would be £247.50 less due to the reduced Employer Contributions. But even if that weren't the case, my take-home pay would also be £660 less or £55 per month worse off.
Have I gone wrong somewhere?