offset mortgage

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I looked at two building society's explanation of the offset mortgage they offer i.e. britannia and market harborough.
Britannia's:
For example, if you had a mortgage of £100,000 and savings of £10,000 we would only charge you interest on £90,000.
Even though your accounts are linked together, you still have complete access to your savings - and all the flexibility of separate accounts.
Market Harborough's:
Here's an example of how our offset mortgage works:
Let’s assume that you have an Offset Account with £10,000 in savings and you have an interest only mortgage of £100,000. The £10,000 in the savings element of the Offset Account earns no interest. However an amount equal to the interest that would have been earned goes to reduce the mortgage balance - not to reduce the monthly mortgage payment.
Given the same figures (100,000 mortgage and 10,000 savings) and assuming they got the same interest rates, does both of them work out the same over 15 years? Will one of them pay off quicker than the other? Any advice / comment is much appreciated
Britannia's:
For example, if you had a mortgage of £100,000 and savings of £10,000 we would only charge you interest on £90,000.

Market Harborough's:
Here's an example of how our offset mortgage works:
Let’s assume that you have an Offset Account with £10,000 in savings and you have an interest only mortgage of £100,000. The £10,000 in the savings element of the Offset Account earns no interest. However an amount equal to the interest that would have been earned goes to reduce the mortgage balance - not to reduce the monthly mortgage payment.
Given the same figures (100,000 mortgage and 10,000 savings) and assuming they got the same interest rates, does both of them work out the same over 15 years? Will one of them pay off quicker than the other? Any advice / comment is much appreciated

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It's important not to reduce the monthly mortgage payment because the bank/building society wants you to remain on the original term whereas your primary motivation for signing up to one of these types of mortgages is to redeem it as fast as possible.
So -- whereas every time I made an overpayment to my bank they wanted to reduce my monthly payment (because they'd recalculate my monthly payments based on a new smaller outstanding amount owed but then assume that I wanted to remain with the original mortgage term - wrong!), I would phone them and reinstate the original monthly amount, thereby reducing the term and allowing me to redeem my mortgage earlier.
Essentially, the examples quoted with these types of mortgage are usually calculated on leaving £10,000 in your offset fund for the entire duration of the mortgage. In my experience, they're a particularly powerful mortgage product if you can afford to leave a lot more than this amount in there, not only because of the tax advantages (particularly if you're a higher-rate taxpayer), but also because you'll reduce the amount of mortgage interest charged by the bank to an absolute minimum.
Mortgage July 2007 - £0
Original Mortgage Termination Date - Nov 2018
Mortgage Interest saved - £63790.60
ISA Profit since Jan 1st 2015 - 98.2% (updated 1 Dec 2020)
You can choose how your mortgage is offset:
Lower Payments
Shorter Term
Reduced Capital
I'm not sure what the differnce is on 2 & 3 as I am on 1, but if you visit their website, I'm suer you will be able to find out.
HTH
MFW - Starting mortgage April 2010 - 120,000
MFW - restart Nov 2013 - £70207.88 & £14086.49
Current balance - £62459.49 & £10380.19
Negatives from my perspective:
1) They don't provide online access and there are limited branches near me with cashpoints, so the only method of finding out my savings balance is phone
2) I have had some issues moving money electronically into the savings account - the account details have been refused by some banking organisations' online systems.
Positives are:
1) I could move without too high a setup cost
2) I get to use an offset with an organisation I know fairly well
3) I still get the annual £250 bonus for being a member
If you are a virulent money saver you might be able to beat an offset using a best buy mortgage and a best buy savings account (particularly ISAs).
However, with larger amounts of savings, you are usually much better off with an offset, because you aren't paying 20 or 40% tax on your savings.
First Direct currently have some best buy products which are good - that way you get to offset your current account and any savings and are able to monitor the whole lot online a lot easier than some building society offset products.
R.
Nicky