HMRC Simple Assessment letter explained
A Simple Assessment can arrive unexpectedly, particularly when pension or savings income is involved. We lay out the tax year, income sources, amount, payment date and disagreement route in one calm sequence.
What this letter usually means
A Simple Assessment means HMRC has calculated tax it believes is due without asking you to complete a Self Assessment return for that amount. The letter should show the calculation and how to respond.
Choose the bit you need right now
Open one view at a time. This keeps a detailed guide manageable when you only need one answer.
Find these six parts
Reference
The payment or assessment reference connected to the bill.
Tax year
The year of income covered by the assessment.
Income sources
For example pay, State Pension, private pensions or savings interest listed by HMRC.
Tax already paid
Amounts HMRC has credited against the calculation.
Amount due
The balance HMRC says remains payable.
Payment date
The deadline printed on your assessment.
Compare the letter with what you already have
- Is this the latest assessment for that tax year?
- Do the pension, pay and savings figures match your records?
- Has a payment already made been allocated to the same year?
- Does the letter give a payment date or a date for raising a query?
- Are you already in Self Assessment for the same income and year?
Plain-English mini glossary
Simple Assessment
A calculation and tax bill issued by HMRC without a Self Assessment return for that amount.
PA302
A reference commonly associated with a Simple Assessment calculation letter.
State Pension
Taxable income that is generally paid without tax being deducted first.
Bank interest
Savings income that banks may report to HMRC.
Assessment date
The date HMRC made or issued the calculation.
Replacement assessment
A later calculation for the same tax year that may replace an earlier one.
Useful neutral questions
- Is this the newest assessment for this tax year?
- Which income figure produced the bill?
- Has HMRC allowed for tax or payments already made?
- What is the final date for querying this calculation?
- Which reference must be used if a payment is made?
These are prompts, not a statement that anything is wrong.
From envelope to clear next conversation
Identify the tax year
Keep different years and replacement assessments separate.
Compare the calculation
Use pension statements, P60s, bank interest records and payment evidence.
Act within the stated time
Official guidance says you can challenge a Simple Assessment; follow the route and date in your letter.
Use the correct reference
If paying, use the official method and reference shown for your assessment.
Try the short audio summary
Use the button to hear this page’s quick explanation. If you order, you can also request a personalised audio copy of the explanation made from your own letter.
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One letter. One clear companion.
Upload a PDF, scan or clear photographs. We identify the main message, explain unfamiliar wording, pull out dates and actions, and organise neutral questions. Request an audio copy if listening is easier.
Clarity Companion explains document wording only. It does not check tax calculations, provide tax, financial or legal advice, contact HMRC, submit an appeal or act as your representative.
PA302 · Simple Assessment FAQs
Why did I receive a Simple Assessment?
HMRC may use it when tax cannot be collected in the usual way, including some cases involving pensions, savings or an amount too large to collect through a tax code. Your letter should explain the calculation.
Can a later letter change the amount?
HMRC can issue an updated assessment when it receives more information. Keep every version and identify the newest one for that tax year.
Can Clarity Companion challenge it for me?
No. We can explain the calculation and organise questions. You remain responsible for contacting HMRC or a qualified tax adviser and meeting any deadline.
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