Most months Iām in credit, so the constant -Ā£20 yes.
All banks have āinternal scoringā which is in addition to your credit score. In simple terms (as their system is a bit crazy) Lloyds is 1-9 for MOST customers. 9 is essentially highest risk (virtually no/limited lending), 1 is lowest.
Things like # of days in credit, average amount in account, total in account over the month etc. affect it
Something awful on your external credit and youāre stuffed anyway.
But assuming a good/reasonable credit report, thinks like salary in, credit balances etc are then converted to an internal score. So internal Lloyds score of 1 and youāre looking to get offered loans/ODs/cards etc - all of which Monzo donāt offer at great rates currently.
Leave your account dormant and itāll basically be going on external (credit report) only, meaning youād probably be band 4/5/6 or whatever unless you had exceptionally high income.
Say you need to make a loan application at Lloyds - if you are a band 4/5 and you wonāt be getting the best rates. If you are band 1 or 2 through salary payments, high credit balance etc, then you should almost certainly get the representative rate (or below, if that particular product offers even lower to some customers).
If Iām going to leave one account at Ā£0, itāll be Monzo rather than Lloyds for essentially that reason.
Monzo may internally score me badly for being at Ā£0/overdrawn, but their credit offering is poor so I wouldnāt need it. Lloyds on the other hand I want them to score me better incase I do ever get one of their loans etc.
Whether internal scoring plays a part in Mortgage acceptance Iām not sure, but one of their mortgage advisers suggested to my friend she had an āexcellent credit scoreā (so presumably risk band 1/2/3 as thatās the type of thing they can see), so perhaps it does.
My Monzo OD also doesnāt report to CRAs for some reason - if it did, Iād probably keep it at zero! As like you say constant OD can affect external/main credit report.