Using credit card lump sum to save int

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Hi what’s views/opinions on using a credit card that transfers money into your current account and then using it to pay a lump of your mortgage? Even with the transfer fee it appears to save such a lot off the mortgage. Am I missing something?
i.e 6k on credit card with transfer fee of £179, repaid over 2/3 years interest free. Mortgage interest saved nearly £1300 and 9 years off mortgage. Is there a catch of doing this apart from the risk of not affording the credit card payments?
Thanks
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MFW start: April 2018, £201,800
Mortgage neutral: September 2022, mortgage redeemed: December 2022
New house, new mortgage: December 2022, £276,007
Current balance: £222,600
(mortgage is fixed rate 1.94% 5 years)
Another way to get an approximation from the overpayment calculator would be to compare the two scenarios:
1) one-off overpayment of £6,000 - what's your remaining balance after 2 years?
2) regular monthly overpayment of £250 - what's your remaining balance after 2 years?
Does scenario 1 leave you at least £179 better off than scenario 2? If not, it's not worth it, because of that transfer fee.
[Caveat: I've heard people mention that the MSE mortgage overpayment calculator isn't 100% accurate either, but it should at least give you an idea].
MFW start: April 2018, £201,800
Mortgage neutral: September 2022, mortgage redeemed: December 2022
New house, new mortgage: December 2022, £276,007
Current balance: £222,600
Edited to add: The savings rate would need to be much higher than the mortgage interest rate for this to work out better if I'm not mistaken.
MFW start: April 2018, £201,800
Mortgage neutral: September 2022, mortgage redeemed: December 2022
New house, new mortgage: December 2022, £276,007
Current balance: £222,600
MFW start: April 2018, £201,800
Mortgage neutral: September 2022, mortgage redeemed: December 2022
New house, new mortgage: December 2022, £276,007
Current balance: £222,600