A brown envelope from HM Revenue & Customs (HMRC) often brings bad news. Thousands of UK households will get one soon, as HMRC is sending out around 1.8 million Simple Assessment letters for the 2025/26 tax year.
These letters, called PA302 letters, inform taxpayers that HMRC believes they owe some Income Tax. They explain how HMRC calculated the unpaid amount. These letters may arrive when tax hasn’t been collected automatically through PAYE or Self Assessment, such as from savings interest, dividends, second jobs, or pension income.
If you receive this letter, the key message is simple: don’t ignore it. But don’t just pay the amount shown without checking. HMRC advises you to review your own financial records before making any payments.
So, why did HMRC send you a tax letter? What is a Simple Assessment? Who is likely to get one? And when do you need to pay? Here’s what UK taxpayers should know.
Why HMRC Is Sending 1.8 Million Tax Letters
On July 28, 2026, HMRC announced it will send about 1.8 million Simple Assessment letters. These letters mainly relate to the 2025/26 tax year, which ran from April 6, 2025, to April 5, 2026. HMRC says this is part of their regular annual process, not a new tax crackdown.
So many letters are needed because not everyone’s Income Tax is collected through PAYE. HMRC gathers financial info from employers, pension providers, the Department for Work and Pensions, banks, and other sources. They then compare this info with the tax already collected. If it seems someone hasn’t paid enough and HMRC can’t adjust their tax code, they may generate a Simple Assessment bill.
Receiving one of the 1.8 million tax letters might sound serious, but it doesn’t mean HMRC thinks you avoided taxes on purpose. HMRC says these letters are automatically created when information shows that more tax is owed.
Still, you need to address an HMRC tax owed letter when it arrives. Understand why the calculation was made, check if the figures are correct, and find out the payment deadline.
What Is an HMRC Simple Assessment Letter?
Simple Assessment is a system that lets HMRC calculate certain Income Tax amounts without needing the taxpayer to fill out a full Self Assessment return. HMRC sends a PA302 letter, or Simple Assessment, that outlines your taxable income, the tax they believe you owe, what’s already been paid, and what you still owe.
It’s important to know that the rules for Simple Assessment are different from those for Self Assessment. Getting a PA302 doesn’t mean you have to complete a Self Assessment return. HMRC makes it clear that Simple Assessment is not the same as a Self Assessment tax return.
However, some people with a PA302 letter may also have Self Assessment duties. For instance, a freelancer with undeclared self-employed income can’t assume that paying a PA302 takes care of all their filing needs.
If you earn money from different sources or are unsure if HMRC has assessed your tax correctly, getting professional help can be useful. Our Self Assessment Accountant in London, with Expert Tax Return Services, can assist you in reviewing your income, understanding your filing responsibilities, and determining if a Self Assessment return is necessary, along with handling correspondence from HMRC.
Who Will Receive HMRC Tax Letters in 2026?
In 2026, HMRC will send tax letters to people who owe Income Tax that can’t be collected through their tax code. This usually applies if you owe £3,000 or more or if you need to pay tax on your State Pension.
However, other situations can also lead to a tax bill. HMRC may send a Simple Assessment if:
- You owe tax on savings interest.
- You owe tax on dividend income.
- You have untaxed second income.
- You owe tax on pension income.
- You received more tax-free allowance than allowed.
- HMRC can’t collect the balance through your PAYE tax code.
- You have unpaid Income Tax.
So, the 1.8 million letters aren’t just for one type of taxpayer. Pensioners, workers, savers, investors, and people with side jobs could all receive one.
Those with unusual income sources should pay close attention. For example, contractors and digital workers often have salaries, dividends, and freelance income combined. Our Specialist Accountants for IT Contractors and Freelancers can help organise these incomes and figure out how to report them.
Similarly, influencers, artists, musicians, and other creators may earn money from sponsorships, royalties, platform payments, and freelance work. Our Accountants for Creative Industries can help ensure these earnings are recorded and reported correctly.
Pensioners Are a Major Part of the 2026 Letter Campaign
One important part of the HMRC tax warning affects pensioners. HMRC stated that working-age people received Simple Assessment letters starting June 30, 2026, while pensioners got theirs from August 12, 2026. Another batch of letters will go out between October and December 2026, especially regarding bank and building society interest.
Because of this, more people will likely search for terms like “HMRC pensioners tax letter” or “HMRC tax letter pensioners” throughout 2026.
This is partly due to how the State Pension is taxed. The State Pension is taxable income, but Income Tax is not taken out before it reaches your bank. HMRC looks at your State Pension along with your other taxable income. You only pay Income Tax if your total income exceeds your tax allowances.
If a pensioner receives a workplace or private pension, HMRC usually collects tax on the State Pension using the tax code for that pension. If HMRC can’t collect the tax this way, they may send a Simple Assessment after the tax year ends.
So, getting a pension-related PA302 letter does not mean something is now taxable that wasn’t before. It simply means HMRC has found that your total income means you owe some Income Tax that wasn’t fully paid during the year.
Can HMRC Tax State Pension Income?
The question of whether HMRC taxes State Pension income can be confusing. Pensioners receive their State Pension without any tax taken out first.
It’s important to know that the State Pension is taxable income, even though tax isn’t usually deducted right away. HMRC combines the State Pension with other taxable income and applies the necessary tax rules.
For instance, a pensioner may have income from:
- the State Pension
- a workplace pension
- a private pension
- a job
- self-employment
- savings interest
- investment income
- rental property
- certain taxable benefits
These income sources can add up and exceed the available Personal Allowance, leading to a tax bill even if each amount seems small alone.
If the State Pension is someone’s only income and it is above their Personal Allowance, HMRC can use a Simple Assessment to collect the tax.
Pensioners shouldn’t assume that HMRC’s tax letter is wrong just because tax hasn’t been taken from their weekly State Pension. They also shouldn’t assume HMRC’s calculations are always correct without verifying them.
Your Savings Could Also Trigger an HMRC Letter
Pension income isn’t the only thing to consider. Another big reason people might get HMRC tax letters in 2026 is savings interest.
Banks and building societies tell HMRC how much interest they pay customers. HMRC uses this information to determine if you owe more Income Tax. They have stated that the PA302 letters expected between October and December 2026 will be about Bank and Building Society Interest data.
So, you might get an HMRC tax letter about savings interest even if you never reported how much interest your accounts earned. Whether this interest leads to an Income Tax bill depends on your overall financial situation and tax allowances.
This is especially important for pensioners and high-income savers. Someone might follow the rules for years but later find that higher savings, changing interest rates, or increased pension income make more of their interest taxable.
A PA302 could include income from savings along with pension or job income. If you receive it, don’t just focus on the total amount HMRC says you owe. Look at the interest figure, too.
Compare HMRC’s calculation with your bank statements and other savings records. If you have accounts with multiple banks, remember that HMRC may be combining interest from all those accounts.
What Exactly Should You Check on a PA302?
Checking Your HMRC Simple Assessment
Knowing how to check your HMRC Simple Assessment can help you avoid overpaying or incorrectly disputing a correct calculation.
HMRC suggests comparing your Simple Assessment with records like your P60, P45, bank statements, DWP letters, pension statements, and benefit information.
When you receive your HMRC letter, review the details carefully instead of rushing to the total at the bottom. Check:
- your name and details
- the tax year
- employment income
- pension income
- State Pension
- savings interest
- dividend or investment income
- taxable benefits
- allowances applied by HMRC
- tax already paid through PAYE
- the amount owed
- the payment deadline
Your PA302 will also have the reference needed for payment. HMRC says Simple Assessment payments use a 14-character reference starting with “X.”. Using the wrong reference can delay your payment.
You can also view the calculation through your HMRC Personal Tax Account. HMRC sends Simple Assessment notices by post or makes them available online.
If something doesn’t match, collect supporting evidence before contacting HMRC. Showing exactly what’s incorrect and what the right figure should be will make it easier to explain.
What If You Think HMRC Has Got the Calculation Wrong?
Take an HMRC letter seriously, but it can be challenged. If you think the numbers in your Simple Assessment tax bill are wrong, contact HMRC within 60 days of the bill date. Point out which figures are incorrect, state the right numbers, and explain your supporting records.
HMRC may ask for proof like bank statements, pension details, or payslips. If they agree the calculation is wrong, they will send you a new Simple Assessment. If they disagree, they will send a decision letter explaining why. You usually have 30 days from this letter to appeal if you’re still unhappy.
Remember, disputing the numbers doesn’t cancel the payment deadline. You still need to pay the bill on time unless HMRC says you can delay it.
Professional support can be very helpful in these situations. If your issue leads to a formal dispute or penalty, our HMRC Penalty Appeals Service in London can assist you in reviewing HMRC’s decision and organising your records.
Also, receiving a PA302 does not mean an investigation is happening. If HMRC later questions past returns or records, our HMRC Tax Investigation Service in London can help individuals and businesses manage these enquiries.
The HMRC Payment Deadline You Cannot Afford to Miss
The most important date on your PA302 isn’t the tax amount but the payment deadline.
For the 2025/26 tax year, if you get a Simple Assessment letter before October 31 2026, you usually need to pay by January 31 2027. This deadline is crucial for many people receiving these letters. However, there’s an exception.
If your Simple Assessment arrives on or after October 31, 2026, for 2025/26 or an earlier year, you typically have three months from the letter’s date to pay.
So, don’t assume all PA302 letters have the same deadline. Always check the date on your letter. This is especially important since HMRC will send out more letters from October to December. Those who receive letters later might have different deadlines than those who got theirs earlier.
To know when to pay HMRC Simple Assessment, always check the payment date on your PA302 and follow that.
How Can You Pay a Simple Assessment Bill?
Once you’ve checked and confirmed that you owe HMRC unpaid tax, you can arrange to pay.
HMRC lets you pay Simple Assessment taxes online, via bank transfer, or by cheque. You can also use the HMRC app for online banking payments.
You don’t have to pay the full amount at once. HMRC allows you to split the total into smaller payments, as long as the full amount is paid by the deadline. This can help if you get a surprise tax bill a few months before it’s due, letting you avoid one big payment.
Remember, making smaller payments before the deadline is different from not being able to pay the full amount on time. If you can’t pay in time, contact HMRC right away to discuss possible support.
Always use official HMRC payment methods and check details on GOV.UK or your Personal Tax Account. Beware of scams; don’t pay just because a message seems urgent.
What Happens If I Ignore an HMRC Tax Letter?
Ignoring an HMRC tax letter doesn’t make your tax obligation go away. HMRC clearly advises recipients not to ignore these letters. If the calculation is correct, you still owe the tax and must pay by the deadline.
If you think the calculation is wrong, staying silent is usually not a good idea. HMRC allows you to challenge incorrect figures, but you must do this within a certain time frame. Delaying can make it harder to fix the issue.
Here are some good actions to take when you receive a PA302:
- Check the calculation and pay if it’s correct.
- Contact HMRC quickly if you think a figure is wrong.
- Get professional help if you don’t understand the calculation.
- Reach out to HMRC early if you can’t pay by the deadline.
- Keep copies of all letters and documents.
Don’t assume that not filing a Self Assessment means you owe no tax. Also, a Simple Assessment doesn’t replace a tax return if you still need to do a Self Assessment. Your tax obligations depend on your situation, not just the type of letter from HMRC.
Freelancers, Contractors and Creators Should Look Closely
Many reports about these letters highlight pensioners, but the HMRC tax warning also applies to the growing number of freelancers, contractors, and people with side jobs in the UK.
For example, someone who works a full-time job may also earn extra income from freelance work. Their regular salary is taxed automatically, but the freelance income needs separate reporting. If they think their tax is all sorted because of their payslip, they could face unexpected tax issues.
IT professionals often have salary, dividends, and contract income from different places. Our accountants for IT contractors can help them understand how these income sources interact with Self Assessment and HMRC rules.
The creative industry faces similar challenges. An influencer might earn money from YouTube, TikTok, sponsorships, affiliate commissions, free products, and freelance work. A musician may receive royalties and a salary, while a designer might have both PAYE and private contracts.
Our accountants for creative industries can assist creators in organising their varied income streams, making tax obligations clearer and preventing surprises from HMRC.
The key message is that having multiple income sources doesn’t automatically mean there’s a tax problem. Taxpayers need to know which income has been taxed and what still needs to be reported.
A Simple Assessment Is Not an HMRC Investigation
Seeing “tax owed” on an official letter can make people worried about a tax investigation. However, a PA302 letter is not the same as an HMRC tax investigation. HMRC calls Simple Assessment a routine yearly process based on information from employers, the DWP, and financial institutions.
An investigation is different. HMRC may start one if it wants to look more closely at a tax return, transaction, income source, or other tax matters.
This difference is important because it affects how you should respond. If you receive a Simple Assessment and everything checks out, you may need to pay the amount by the deadline. Don’t assume that every PA302 means something serious is wrong.
On the other hand, if the figures show unreported income, conflict with your tax returns, or if you get follow-up letters asking for records, it might be wise to seek professional help.
Our HMRC Tax Investigation Service in London assists individuals and businesses with HMRC enquiries that go beyond standard tax calculations.
The best response is to carefully read the letter, understand what HMRC wants, and take action before the deadline.
London Taxpayers: Why Local Accounting Support Can Help
Tax rules apply across the country, but taxpayers often need an accountant who knows their specific business situations.
In London, one person might earn a salary while running a small consultancy in their free time. Another might be a landlord and a company director. A designer could work with clients from the UK and abroad, while a startup founder may have a mix of salary, dividends, and investment income.
These scenarios show that a simple question like “Why did HMRC send me a tax letter?” can require a closer look at a person’s tax situation.
In North London, Our Professional Accountants in Camden assist individuals, freelancers, and businesses with their tax returns and accounting needs. Similarly, entrepreneurs and creative professionals in East London can get help from Our Expert Accountants in Shoreditch.
However, professional help shouldn’t just mean passing an HMRC letter to someone and forgetting about it. A good accountant should clarify the calculations, explain what information HMRC used, check if it matches your records, and guide you on what to do next.
Ultimately, taxpayers should strive to understand their tax situation instead of feeling reliant on unclear calculations.
What to Do the Day Your HMRC Letter Arrives
If you receive a tax letter from HMRC in 2026, handle it right away to make things easier.
First, check if the letter is real. HMRC says official Simple Assessment notices can come by post or show up in your Personal Tax Account. If you’re unsure, log into your HMRC account on GOV.UK instead of clicking links in emails or texts.
Next, find the tax year, calculation, and payment date. Gather any documents related to the income HMRC mentioned.
Here’s a simple checklist:
- Confirm the letter is real.
- Check if it is a PA302 Simple Assessment.
- Identify the tax year.
- Note the payment deadline.
- Review all income figures.
- Compare those figures with your records.
- Verify how much tax has already been collected.
- Address any mistakes right away.
- Pay the correct amount by the deadline.
- Keep proof of your payment and correspondence.
If you have income that should have been reported on a tax return, review your overall filing situation. Our Self Assessment Accountant in London can help you figure out what needs to be reported and if any extra steps are needed.
Taking action early gives you time to fix mistakes, get missing statements, and plan for payment without last-minute stress.
Common Mistakes to Avoid With a PA302
- Mistake 1: Don’t assume HMRC is always right. They use a lot of information from other sources, and you should check their numbers against your own records. If your bank interest, pension, job income, or taxes paid don’t match, look into it.
- Mistake 2: Don’t think a letter from HMRC is wrong just because you usually pay taxes through PAYE. PAYE doesn’t cover all taxable income, like savings interest or money from other jobs.
- Mistake 3: Don’t mix up the HMRC Simple Assessment deadline with the regular Self Assessment deadline. Most PA302 bills sent before October 31, 2026, will be due by January 31, 2027. Later assessments may follow different rules. Always check the date on your notice.
- Mistake 4: Don’t ignore a bill just because you can’t pay it right away. Talk to HMRC before the payment is due instead of letting the debt sit unresolved.
Final Tip: Keep the letter after you pay. Save the calculation, your supporting documents, and proof of payment with your tax records in case there are questions later.
What the 1.8 Million Letters Really Mean for UK Taxpayers
The headline “HMRC sends 1.8 million tax letters” sounds big, but the real message is more practical than scary.
HMRC is using information from employers, pension providers, DWP, banks, and building societies to find uncollected Income Tax. If they can’t collect the tax automatically through PAYE or a tax code, they use Simple Assessment to send the taxpayer a calculation instead.
For some people, this tax bill may be about pension income. For others, it could relate to savings interest, dividends, or a second job. Some may have received more tax-free allowance than they were supposed to.
No matter the reason, there’s no need to panic or avoid the issue.
Check the figures. Understand the income HMRC has listed. Compare it with your own records. If you find errors, challenge them within the allowed timeframe. If the bill is correct, arrange payment before the HMRC deadline.
This simple process can keep a regular tax calculation from turning into a bigger problem.
How Clarkwell & Co. Can Help With HMRC Tax Letters
Getting a letter about tax owed from HMRC can be confusing, especially if your financial situation has changed, you have multiple income sources, or you don’t understand how HMRC calculated the amount.
Our Chartered Certified Accountants help individuals, self-employed professionals, and businesses in London and across the UK with tax issues and HMRC matters.
Our services include:
- Reviewing your PA302 calculation with your records
- Checking your employment, pension, and other income
- Determining if you have separate Self Assessment requirements
- Helping you organise information to contact HMRC
- Addressing tax return problems
- Supporting you with disputes and appeals
- Assisting if HMRC launches a detailed enquiry
It’s crucial to act quickly. The sooner you understand HMRC’s request, the more time you’ll have to review the calculation and decide how to respond.
Frequently Asked Questions About HMRC Tax Letters 2026
Why did I get a tax letter from HMRC?
HMRC sends a PA302 Simple Assessment when it thinks you owe Income Tax that can’t be collected through your tax code. Typical reasons include savings interest, dividends, pension income, untaxed second jobs, or large unpaid amounts.
What is a PA302 tax letter?
A PA302 is HMRC’s name for a Simple Assessment tax calculation. It tells you how much Income Tax HMRC thinks you owe, why, and when it should be paid.
Are 1.8 million people under investigation by HMRC?
No. HMRC plans to send about 1.8 million Simple Assessment letters as part of its annual process. Receiving a PA302 does not mean you’re being investigated.
Who will get HMRC tax letters in 2026?
Letters may go to pensioners, savers, people receiving dividends, those with untaxed second jobs, and taxpayers with unpaid amounts that cannot be collected through PAYE.
Why are pensioners getting HMRC tax letters?
State Pension is taxable income, but tax isn’t usually taken out before payment. If HMRC can’t collect tax through another PAYE source, it may send a Simple Assessment.
Can HMRC tax State Pension income?
Yes, State Pension is taxable. You will pay Income Tax only if your total taxable income exceeds your allowances.
Can savings interest lead to a PA302?
Yes. HMRC lists savings interest as a reason for a Simple Assessment. More letters are expected between October and December related to bank and building society interest.
When do I need to pay HMRC Simple Assessment?
If you get a Simple Assessment for 2025/26 before October 31, 2026, payment is usually due by January 31, 2027. For letters received after October 31, payment is due within three months. Check your PA302 for the exact date.
Can I pay my Simple Assessment in instalments?
Yes, you can make smaller payments before the deadline, as long as you pay the total by the due date. If you can’t pay in full, contact HMRC about your situation.
How do I check an HMRC Simple Assessment?
Compare HMRC’s figures with documents like P60s, P45s, bank statements, pension statements, benefits information, and DWP letters.
What if my Simple Assessment is wrong?
Contact HMRC within 60 days of the bill date. Explain what’s incorrect and provide the right amounts with evidence if needed.
Can I appeal a Simple Assessment decision?
If HMRC rejects your dispute and sends a decision letter, you usually have 30 days from that letter to appeal.
Does a PA302 mean I must file Self Assessment?
Not necessarily. Simple Assessment is different from filing a Self Assessment tax return. However, you might still have to file depending on your situation.
Where will my Simple Assessment appear?
You can receive official Simple Assessment notices by post or find them in your HMRC Personal Tax Account.
What happens if I ignore an HMRC tax letter?
Ignoring the letter won’t erase your tax debt. It can also prevent you from challenging incorrect information or arranging payment. HMRC advises not to ignore these letters.
Check First, Then Act
The latest HMRC tax letters in 2026 will impact about 1.8 million people, meaning many households may face Simple Assessment issues before the year ends.
Getting an HMRC Income Tax letter doesn’t always mean you made a mistake. Often, it’s just a notice about tax not collected automatically during the year.
What matters now is your next step.
Check the letter, review the numbers, and note the deadline. If everything looks correct, pay your taxes on time. If you spot a mistake, address it quickly and support your claims with accurate records. If you’re unclear about what HMRC needs or if you have multiple income sources, consider getting professional tax advice before acting.
With 1.8 million letters going out, many people will have similar questions. The good news is that handling a PA302 early and with the right information is usually straightforward.
Important: Tax rules vary for each person and can change. This article offers general information and should not be considered personalised tax advice.
