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Background: I have an offset mortgage on my house. I specifically chose an offset mortgage as my employment circumstances mean there will be irregular and unpredictable cash flows in and out during the term of the mortgage. The interest rate on the offset mortgage (which is fixed until March 2018) is 3.05%.

The UK has been in an 'exceptional', 'unprecedented', 'unsustainable' low base rate era for some seven years now, and (although it's taken a while) real-world borrowing rates have come down and down, to the point where in the past few months I've started to see unsecured personal loans being offered at as little as 3%.

So what I think I'm looking at here is the opportunity to borrow at 3% and lend at 3.05%—in which case I should jump at the chance, right? (subject to acceptance on the loan of course) But I'm not sure if offseting a 3.05% mortgage exactly corresponds to getting a 3.05% return, or if it's just a handy rule of thumb.

Are there any reasons not to borrow as much as I can at 3% APR and put all the money in an account offsetting a 3.05% p.a. mortgage? Do I need to fire up Excel to model the true effective returns and the exact details of when repayments take place and when the offset recalc is performed—or is it enough to say "3% is less than 3.05%, do it" ?

(Please note the as I know many mortgage- and loan-related facts are different from . Also I'm not remotely worried about cash flow or budgetary discipline—I'm very good at not spending money that I know isn't mine.)

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    What are the terms and conditions of the unsecured personal loan? Would it be possible for you to instead renegotiate your mortgage early (if you can pay minimal penalties), and lock in a lower rate for longer? In theory, what you are suggesting may make sense, but the 0.05% profit margin may mean that the administrative headache (and potential risk should something go awry) is not worth it. – Grade 'Eh' Bacon Nov 22 '16 at 15:43
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    Have you looked at remortgaging? e.g. Barclays are offering lower rates than you're currently paying: barclays.co.uk/mortgages/offset-mortgage – Ganesh Sittampalam Nov 22 '16 at 16:38
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    You say that you chose the offset mortgage because of "irregular and unpredictable cash flows" but then in the comment you say "fixed payment schedule with a charge for early settlement". Are you not eliminated the value of the offset mortgage to you if you do this? – JimmyJames Nov 22 '16 at 16:39
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    You are talking about a $500 gain on a $1M loan, hardly worth the effort for such a big risk. If you are able to get such a low rate for an unsecured loan, surely you would be able to get an even lower rate for a secured rate. – Victor Nov 23 '16 at 2:34
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    @user50627 It's worth running the numbers on the rate you can get taking into account early redemption penalties. It's also (@ others who may not be familiar with UK offset mortgages) usual for offset rates to be higher than the rates for simpler mortgages -- but you have easy-access savings effectively earning interest at the mortage rate, without paying tax on it. – Chris H Nov 23 '16 at 9:28
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It is unlikely that the plan is worth doing, given the numbers you have used. However, your thinking is correct that given enough of a rate differential, it could be worth doing.

Consider that for each $100k of your mortgage [and I assume your limit for an unsecured personal loan is likely far less than 100k], you would save only $50/year by taking out a personal unsecured loan of 3% and paying off your 3.05% mortgage.

Instead, such low unsecured rates may be a signal that it would be worthwhile for you to renegotiate your mortgage. You will likely need to pay a fee, but the savings could be significant.

For each $100k of mortgage, a 1% rate change from your current rate saves you 1k per year. So if you can get a mortgage rate of 2% [which may be possible if an unsecured loan costs you 3%], compare the initial administrative fee against those savings, over the course of the term of the renegotiation. ie: $300k saves you 9k over 3 years, so would be well worth even an initial $3k admin fee.

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