Can someone do a quick comparison on these two 5 year fixes...

IAMIAM

£142,000 35 year term
HSBC 1.59% £999 Fee (Add Fee On)
FD 1.69% £490 Fee (Cannot Add Fee On)
Clearly the monthly payment will be cheaper on HSBC, but is FD overall cheaper over 5 years and the remaining balance vs HSBC

swampduck

Try this really useful tool http://locostfireblade.co.uk/spreadsheet/Index.html

getmore4less

Explanation on how to do it yourself is in this thread

https://forums.moneysavingexpert.com/discussion/6252319/how-do-you-decide-whether-to-pay-a-fee-or-not/p2

getmore4less

For a 0.1% differential and £509 difference in fees.

term	size needed
5	£203,011.08
10	£137,370.48
15	£124,011.55
20	£118,275.25
25	£115,093.36
30	£113,075.57
IO	£105,967.55

The break even term/payment is  9y 1m &  £1406pm 

how much better of paying the fee and normal mortgage payment
The rough calc is 0.001 *  142,000 * 5 = £710 with a £509 fee  good chance it is ok when on a long term

worth the check anyway.

amount	rate	payment	owing
£142,509.00	1.59%	£448.12	£126,327.36
£142,000.00	1.69%	£448.12	£126,476.16

pay the fee and be better of by ~£150 after 5 years.