<Your address>
<Postcode>

28 October 2020

<Address of the council tax department>

Dear Sirs,

<Your reference or account number> 
(you will find this on any letters from the council tax department)

I am writing to challenge your decision about my council tax bill. Please can you review <state what part of the bill is wrong and the reason that part of the bill is wrong - for example: 
the valuation of my property
you or someone you live with should be liable to pay council tax
a reduction or discount has not been applied
a penalty charge was added to my bill which should not have been.>.
Please update my council tax account accordingly. Should you require any further information please do not hesitate to contact me.
Thank you. 
Yours faithfully,

<Your name>