Hi JMoell,
I am sorry but there is not an option to submit an email to HMRC.
If the estimated income being used for your tax code is incorrect then you can update the details on your
Personal tax account: sign in or set up online which would then update your code.
The other option is to contact HMRC to review.
Income Tax: general enquiries.
To submit a complaint online you need to go to
Complain about HMRC. Select complain online if you're an individual or a business.
Log in using the relevant HMRC online services account or 'Create sign in details' to create a new account.
Thank you.