So I’ve thought about swapping my car tax over manually and went to check out the DVLA site and saw the following: 
Basically what they are saying is that they can’t be bothered or wont change the direct debit. Honestly I’m not particularly happy with risking cancelling then remembering to re-purchase road tax.
Does anyone else think that given the risks involved i.e. forgetting then accidentally not being taxed think this is a bit sketchy?
Put a reminder in your calendar with alerts one month, three weeks, two weeks, one week, two days and one day before when the tax is due.
Then buy it online with new account details.
Yes, it’s less than ideal but it’s not insurmountable.
(Your car can be seized, under DVLA devolved Powers, by the police if you fail to tax it.)
You can always use Onedox too 
I’ve seen a couple of occasions recently where an ANPR equipped police car has seized someones car for lack of tax.
I dunno, I guess my major gripe is that they are just a bit behind with the times, surely its not a massive effort to be able to just update the details
I pay my road tax yearly. It’s due for renewal November 1st. Tempted to pay my £20 annual fee in monthly installments 
I agree, but I do wonder how you managed when you had to go to a post office to buy car tax 
Alas, there is no monthly option for that. And if there was I’d expect them to charge you £25 for the privilege of paying in instalments. 
Fortunately for me I was relatively late to the driving game and only got my first car in March 2016
You’ve never had it so good!
According to www.gov.uk it’s £21 (Total of 12 monthly instalments by Direct Debit)
Wow. Really?
My car is £30 per year and I was sure there was only an annual option.
I stand corrected.
My car was only £30 and I didn’t have a monthly option only to pay it all in one go
@anon70107404 @jrmurray86 The link I gave above says that you guys should be able to pay £31.50 over 12 months. I haven’t received my renewal notice yet so cannot confirm if this info is current and correct.
It has been 2 years since I’ve paid car tax as I bought a new car before having to renew last year 
You not paid car tax on the new car?
No they paid it for me!
I really don’t see this as an issue.
DVLA send out a car tax reminder in post regardless of payment method.
It’s a non issue for me.
Its not about the renewal its about the lack of facility to change the direct debit without cancelling it and then having to re-purchase on a specific day.
So using a full switch service is the one way to guarantee this?
Again If you can settle balance with the card I don’t see it as an issue.
But CASS doesn’t work yet 
It’s a DVLA issue rather than a Monzo issue as far as I can tell. It’s not a major issue if you know how to work a diary.
File under ‘mild inconvenience but I’ll get over it’