Pay off mortgage in lump by cashing in shares?

dllive

Hi all. I have some shares that Im thinking of selling to help pay off a bit of the mortgage. To say maths isnt a strength of mine would be a serious understatement! I just need a bit of help to gauge whether I should hold onto my (badly) performing shares, or sell them and use that money to help towards the mortgage. The figures below are obviously not the actual figures involved.

Mortgage: £100k
Mortgage rate: 2%
Mortgage length: 25 years
Shares worth: £20k (these are within ISAs and dividends are reinvested)

So how would I work out what the amount Ild be saving on the mortgage if I chucked £20k at it, and how the shares would have to perform to better that?

I know there are many more variables involved (the shares may never recover, or they may shoot through the roof in 4 years time, the mortgage interest rate is variable so could go up - or down etc....). But any clever people out there with a view, or an equation that says either it is worth selling the shares or not worth selling the shares then Ild very much appreciate it!

I have tried various mortgage calculators, but the ones Ive seen only say how much Ild save over the mortgage period if I overpaid by monthly amounts, not a 1 lump payment.

many thanks

dimbo61

Have you got these shares in BP ? by any chance.
Without knowing which shares you have and what you have invested in nobody has any chance of giving you advice or ideas.
Now 2% is a very good rate and you have at least got the shares in an ISA wrapper so no tax but each time you buy/sell a share you pay a fee to the brokers ( think £1 million pounds bonsus )
You need an emergency fund of 3/6 months income just in case but you could just overpay each month with savings as bonds mature and ISA,s finish and spare income.