Tax Codes: What Should You Put for Personal Allowances?

For UK employees, pensioners and employers asking, “What should I put for personal allowances?”, the answer depends on the person’s tax position rather than a figure chosen manually. For the 2026-2027 tax year, the standard Personal Allowance is £12,570, and many people with one job or pension will usually have a 1257L tax code. Employers should rely on HMRC information, a P45 or the starter checklist process when setting up PAYE.

A wrong allowance or tax code can affect take-home pay and create later corrections. For businesses, payroll mistakes can lead to employee queries, extra administration and inaccurate deductions.

Key Points

• The standard Personal Allowance for 2026 to 2027 is £12,570.
• The common 1257L tax code usually applies to people receiving the standard allowance.
• Employers should not decide an employee’s allowance without HMRC information.
• A P45 is normally the starting point when a worker changes jobs.
• The starter checklist PAYE process applies when a new employee has no P45.
• Higher earners may lose some or all of their Personal Allowance.

How Does the 1257L Tax Code Work?

The UK Personal Allowance remains fixed at £12,570 for the 2026 to 2027 tax year. The tax year runs from 6 April 2026 to 5 April 2027, and the allowance represents the amount of income an individual can receive before Income Tax becomes payable.

For payroll purposes, employees do not normally enter a cash allowance figure themselves. Instead, HMRC converts their circumstances into a tax code, which employers use through PAYE.

How HMRC Decides the Tax Code:

Personal Allowances are a central part of the PAYE system. They determine how much income is treated as tax-free before Income Tax is deducted from earnings.

The figure shown through payroll is usually reflected through a personal allowance tax code rather than a separate payment adjustment. HMRC considers factors such as employment income, taxable benefits, pension income and unpaid tax when calculating the correct code.

For most employees, the employer’s role is to apply the code provided by HMRC rather than calculate the allowance independently.

When to Use a P45 or Starter Checklist:

If an employee has one job, no taxable benefits, no additional income and no outstanding tax adjustments, the usual position is the standard 1257L tax code.

However, the correct answer depends on the form being completed:

• When starting a job, provide details from your P45 where available.
• If there is no P45, complete the starter checklist PAYE questions accurately.
• Check HMRC records if your income or employment situation has changed.
• Do not automatically select the highest allowance if you have other income sources.

A 1257L tax code generally means the person receives the standard Personal Allowance. The number represents the tax-free amount divided by ten, while the letter indicates the individual’s circumstances.

Which Situations Change a Tax Code:

For employers, the standard Personal Allowance translates into PAYE payroll thresholds of £242 per week and £1,048 per month during the 2026 to 2027 tax year.

Not every taxpayer receives the full allowance. HMRC can adjust tax codes because of:

• Company benefits such as private medical insurance or a company car.
• Untaxed income.
• Previous underpaid tax.
• More than one employment.
• Pension income.

High earners are also affected. A personal allowance is reduced by £1 for every £2 of adjusted net income above £100,000 and can fall to zero once income reaches £125,140 or above.

Who Is Most Likely to Get the Wrong Code?

The issue commonly affects:

• Employees joining a new employer.
• Businesses processing payroll for new starters.
• Directors receiving PAYE salary.
• Workers with multiple jobs.
• Pensioners with employment income.
• Employees receiving taxable benefits.

The correct tax code becomes particularly important when someone’s circumstances change. A new job, second income source or benefit can alter the amount of tax-free income available.

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Why Employers Should Not Guess the Allowance:

The main mistake businesses and employees make is treating personal allowance as a fixed choice rather than part of the wider PAYE system.

Someone completing a form may see a question about allowances and assume they should enter £12,570. In reality, payroll depends on the tax code issued for that individual.

A business should avoid manually changing allowances unless supported by HMRC guidance. Applying an incorrect code can result in employees paying the wrong amount of tax throughout the year.

Employees should regularly check their tax code through their HMRC account, especially after changing jobs, receiving benefits or starting pension income.

How to Check and Correct PAYE Details:

Payroll accuracy affects both compliance and employee trust. A wrong tax code can reduce or increase take-home pay incorrectly and may require later adjustments through PAYE.

For small businesses, payroll queries can create unnecessary administration. Directors also need to consider how salary, dividends, benefits and other income affect their overall tax position.

Keeping payroll records accurate and applying HMRC coding notices promptly helps prevent avoidable issues. Employees who change jobs or take on a second income should always confirm their personal allowance tax code is up to date before the next payroll run.

What Businesses Should Do

Employers should:

• Use P45 details when available.
• Ask new employees to complete the starter checklist where required.
• Apply HMRC coding notices promptly.
• Review unusual codes such as BR, 0T, K and emergency codes.
• Update payroll records when employee circumstances change.
• Encourage employees to review their HMRC tax details.

How Can Apex Accountants Help?

Apex Accountants supports businesses with PAYE, payroll and tax code matters by reviewing processes and identifying areas where errors may occur. Our team provides practical guidance to help employers maintain accurate payroll records and apply the correct tax treatment.

We can help with:

• Reviewing PAYE tax codes and payroll calculations.
• Checking starter checklist treatment for new employees.
• Advising directors on salary, benefits and wider tax considerations.
• Identifying potential payroll errors linked to incorrect tax codes.
• Supporting businesses with HMRC-related payroll queries.

By combining payroll knowledge with wider tax expertise, Apex Accountants helps businesses manage their obligations with greater confidence and accuracy. Contact us and book your consultation with tax experts today.

Conclusion

For most people asking, “What should I put for personal allowances”, the starting point is the standard £12,570 Personal Allowance and the commonly used 1257L tax code. However, the correct position depends on HMRC information, employment circumstances and other sources of income. To review your PAYE position, contact Apex Accountants today.

FAQs

What should I put for personal allowances on a tax form?

Most people with one job and no adjustments will usually have the standard Personal Allowance of £12,570, but the correct answer depends on HMRC information.

What does a 1257L tax code mean?

A 1257L tax code usually means the taxpayer receives the standard Personal Allowance through PAYE.

Should employers choose an employee’s Personal Allowance?

No. Employers should use the tax code provided by HMRC or information from the starter checklist process.

Can my Personal Allowance be reduced?

Yes. It can be reduced because of high income, taxable benefits, unpaid tax or other income.

How can I check if my tax code is correct?

You can review your tax code through HMRC’s online Income Tax service and update any incorrect details.