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TiVo_Lad said:pecunianonolet said:Getting fed up with Zopa a bit as they don't seem to be able to properly calculate interest. My balance was 0, got 0.26 in interest and balance is now 0.27
I contacted Zopa about this last year. It's because they calulate interest daily to six decimal places so even though you only got 26p this month, there was probably less than 1p owing from last month so this month's (which might have been slightly more than 26p) plus last month's takes it over to the next penny. They're actually being super honest.
It's an implementation error that has nothing to do with the number of decimal places to which they calculate interest.
Zopa always rounds down when displaying figures, which in itself is not a problem. They also retain fractional pennies, rolling them over to the next period; however, the fractional penny is only factored into the account balance figure (which is accurate), and not the individual 'interest paid' figure (which may be off by 1p).
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mebu60 said:TiVo_Lad said:Aldermore have launched Issue 1 of their Double Access Account at 3.55%A maximum of two easy access withdrawals are allowed per year, additional withdrawals will result in the rate dropping to 0.10% for the remainder of that year. Interest is paid annually or monthly.
This is a time when I would have preferred it being a new issue as I have no withdrawals remaining until 31 August! Currently only a modest balance left in there.0 -
AmityNeon said:TiVo_Lad said:pecunianonolet said:Getting fed up with Zopa a bit as they don't seem to be able to properly calculate interest. My balance was 0, got 0.26 in interest and balance is now 0.27
I contacted Zopa about this last year. It's because they calulate interest daily to six decimal places so even though you only got 26p this month, there was probably less than 1p owing from last month so this month's (which might have been slightly more than 26p) plus last month's takes it over to the next penny. They're actually being super honest.
It's an implementation error that has nothing to do with the number of decimal places to which they calculate interest.
Zopa always rounds down when displaying figures, which in itself is not a problem. They also retain fractional pennies, rolling them over to the next period; however, the fractional penny is only factored into the account balance figure (which is accurate), and not the individual 'interest paid' figure (which may be off by 1p).
It has everything to do with their calculation of interest to six decimal places. It would not occur if they calculated to zero decimal places or always rounded up.Their implementation is not in error because the amount of interest (to a whole penny which is the lowest denominator of the account) payable in a given period is always accurate. But when the amount of fractional pennies adds up to a whole penny, they adjust the balance accordingly. That's their choice. It is not an error.2 -
pecunianonolet said:Getting fed up with Zopa a bit as they don't seem to be able to properly calculate interest. My balance was 0, got 0.26 in interest and balance is now 0.273
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Wonder if Zopa will update its rates now its dropped off a lot of lists.0
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Wheres_My_Cashback said:pecunianonolet said:Getting fed up with Zopa a bit as they don't seem to be able to properly calculate interest. My balance was 0, got 0.26 in interest and balance is now 0.272
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Matt17 said:mebu60 said:TiVo_Lad said:Aldermore have launched Issue 1 of their Double Access Account at 3.55%A maximum of two easy access withdrawals are allowed per year, additional withdrawals will result in the rate dropping to 0.10% for the remainder of that year. Interest is paid annually or monthly.
This is a time when I would have preferred it being a new issue as I have no withdrawals remaining until 31 August! Currently only a modest balance left in there.0 -
TiVo_Lad said:AmityNeon said:TiVo_Lad said:pecunianonolet said:Getting fed up with Zopa a bit as they don't seem to be able to properly calculate interest. My balance was 0, got 0.26 in interest and balance is now 0.27
I contacted Zopa about this last year. It's because they calulate interest daily to six decimal places so even though you only got 26p this month, there was probably less than 1p owing from last month so this month's (which might have been slightly more than 26p) plus last month's takes it over to the next penny. They're actually being super honest.
It's an implementation error that has nothing to do with the number of decimal places to which they calculate interest.
Zopa always rounds down when displaying figures, which in itself is not a problem. They also retain fractional pennies, rolling them over to the next period; however, the fractional penny is only factored into the account balance figure (which is accurate), and not the individual 'interest paid' figure (which may be off by 1p).
It has everything to do with their calculation of interest to six decimal places. It would not occur if they calculated to zero decimal places or always rounded up.
Just because the 1p discrepancy would not occur if not calculating interest to six decimal places, does not mean the discrepancy itself is caused by calculating interest to six decimal places; Zopa can still calculate interest to six decimal places without showing an erroneous 1p discrepancy.
TiVo_Lad said:Their implementation is not in error because the amount of interest (to a whole penny which is the lowest denominator of the account) payable in a given period is always accurate. But when the amount of fractional pennies adds up to a whole penny, they adjust the balance accordingly. That's their choice. It is not an error.No, their implementation is erroneous because it's not accurate. How is it logical for the account balance to increase by more than the stated interest paid (not just payable)? Why should the annual interest certificate show more total interest than the sum of the individual monthly interest payments? If and when the account balance is adjusted to account for an additional whole penny as a result of accruing fractional pennies, the 'interest paid' figure for the month in question should increase concomitantly for accuracy.
Calculating interest to six decimal places just means they are retaining fractional pennies between interest periods. The problem is, this fractional penny is only factored into the account balance figure, and not the individual 'interest paid' figure, which is specifically what causes the 1p discrepancy. They could just as easily subtract the previous account balance from the new account balance to show the actual interest paid (as per account balance difference), or, include the fractional penny from the previous interest period when calculating interest, before rounding down to the nearest penny.
pecunianonolet said:
I really don't care if they calculate to 3, 6 or 10 decimal numbers. What they pay into the account and what they state on documents should match. No other bank or building society has discrepancies with what they report and what they actually pay into the account. It's the principle and not the few pennies I care aboutExactly. Retaining fractional pennies for eventual payout is not the reason, let alone an acceptable reason, for mismatched figures.
Just keep in mind that with Zopa, your account balance is the accurate figure. What they report to HMRC annually should be the total interest paid to you, the sum of the monthly increases to your account balance (which includes the fractional pennies).
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fwdrew said:Wonder if Zopa will update its rates now its dropped off a lot of lists.4
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TiVo_Lad said:Aldermore have launched Issue 1 of their Double Access Account at 3.55%A maximum of two easy access withdrawals are allowed per year, additional withdrawals will result in the rate dropping to 0.10% for the remainder of that year. Interest is paid annually or monthly.0
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