HMRC Letters That Start Arriving in January
Which Ones You Must Never Ignore

January is when HMRC correspondence ramps up.
Most letters are routine — but some signal deadlines, penalties, or action required. Ignoring the wrong one can turn a small issue into a serious problem.

Why HMRC letters start arriving in January

January marks a transition point in the UK tax calendar. HMRC begins reconciling prior-year records, Self Assessment filings, tax codes, and outstanding balances.

Important to know:
An HMRC letter is not automatically “bad news” — but it is never meaningless.

The HMRC letters you should expect in January

1️⃣ Tax code notices (PAYE)

Many people receive updated tax code letters early in the year. These affect how much tax is taken from your pay and should always be checked for accuracy.

2️⃣ Self Assessment reminders and confirmations

If you are required to file a Self Assessment return, HMRC may send reminders or confirmations close to the January deadline.

3️⃣ Penalty and late payment notices

Missed deadlines or unpaid balances can trigger penalty letters. Interest continues to accrue until the issue is resolved.

4️⃣ Payment demand or balance due letters

These letters outline what HMRC believes you owe. They usually include deadlines and instructions for payment or contact.

5️⃣ Compliance or information requests

HMRC may request clarification or documents if something does not match their records.

Which HMRC letters you must never ignore

• Any letter mentioning penalty, surcharge, or interest
• Payment demand or “amount due” notices
• Self Assessment deadline or enforcement warnings
• Requests for information with a response date

Ignoring these can escalate the issue automatically.

What to do if an HMRC letter arrives

• Read the letter fully — note the reference number
• Check the tax year and issue mentioned
• Mark any response or payment deadline immediately
• Contact HMRC or a tax professional if unsure

Early action keeps options open. Delay reduces flexibility.

Key takeaway:
Most HMRC issues are manageable early.
They become serious only when ignored.

Important: This article is general information, not tax advice. HMRC correspondence varies by situation.

Related reading: HMRC Tax Codes Explained, HMRC Penalty Letters and What They Mean, Self Assessment Deadlines Most People Miss