it's a far more effective way of long-term saving as you're effectively getting £140 for every £100 you save even before the money's invested.
There are various ways of paying pension contributions. The most advantageous is salary sacrifice, which means you get relief from NI (as does your employer) as well as Income Tax. If you sacrifice £1,000 of salary your net pay will decrease by £580 which is a little over £172 into your pension for every £100 reduction in net pay.
If your pension contributions are simply deducted from gross pay then for £1,000 pension contributions your net pay will decrease by £600 which is over £166 into your pension for every £100 reduction in net pay.
And if your pension contributions are deducted from net pay with the pension provided claiming 25% (THIS IS A COMMON ARRANGEMENT AND IF IT APPLIES TO YOU YOU MUST COMPLETE A TAX RETURN OTHERWISE YOU ARE THROWING AWAY £THOUSANDS), if you make a net contribution of £800 your pension provider will claim back £200 and you can claim back £200 through your tax return so again you get over £166 into your pension for every £100 reduction in net income.
The savings for upper rate taxpayers are proportionately higher.
So, unless your pension provider went bust
Pension funds are ring-fenced so they are not materially affected by the provider going bust. Note however that there will be charges which apply on funds entering and/or exiting the scheme as well as annual charges, and if there is a collapse in the value of the underlying investments you may lose money.
So is that generally seen as the best way of reducing the 'adjusted net income' (assuming you can afford to)? With 2 kids, given that every thousand pounds you reduce your 'adjusted net income' over £50k saves you £175 (i.e. 10% of your CB), the annual return on an extra £1000 pension contribution is immediately £175, or 17.5% of that £1000, which is far better than anything you'd get in a savings account/bond. Plus your pension pot would increase.
Yes. So the reduction in your net income for the £1,000 pension contribution becomes £600 - £175 = £425 - an initial return of 135%! And that's with only 2 children, if you have 4 that becomes 250%.
Looking at it another way your marginal tax rate is 57.5%. For someone with 4 children it becomes 71.5% (and yes, if you are a claiming CB for 9 children it actually goes over 100% so the more money you earn, the less you take home).