Soldato
Without throw out extact numbers and your situation, we are only taking theory.. and yes if your affairs are complex or you're in doubt... go see a IFA.
The amount you pay into a salary sacrifice pension schemes are not considered as taxable income... as the money is taken from your pay before tax and ni.
Normal pension schemes are tax and NI before the money is taken out and your pension company should be claiming the tax amount back (but not your NI) for you like in a SIPP.
basically by using captial gains instead of taxable income, it gives you an extra £3,000 towards your "tax free allowance"...
what you need to consider is that by using salary sac to pay into your pension, your missing the 10% NI tax as well.. something a SIPP won't give you
I too have a load of shares in a GIA via work, and I tend to cash out on them as soon as they are income tax free, taking out the amount that is capital gains tax free.
but I reinvest it in a ISA stocks and shares, as they should have already been taxed the once, hell if I'm sticking into a SIPP and running the risk of it getting taxed on the way out again. if possible, start to withdraw the capital gains tax free allowance from the pot.. it may take a few years and you may get hit by mulitple transaction fees but it's tax free.
if you start throwing another person's tax allowance in to the mix, there's plenty of stuff you can do... like put all your higher taxed salary into a pension and not pay into theirs at all... as you would be getting better tax relief.
Although its "relief at source" and you still need to reclaim the other 20% if your a higher rate payer, oh and probably only save 2% NI.