---
title: Why Is My Personal Allowance Less Than £12570 in 2026/27?
description: "If you have reviewed your latest payslip or HMRC tax calculation and are asking, \"why is my personal allowance less than £12570\", the answer usually involves HMRC adjusting your tax code to collect tax on other income, recover debts, or…"
url: "https://www.accountingfirms.co.uk/knowledge-bank/why-is-my-personal-allowance-less-than-12570/"
updated: "2026-08-11"
category: Self Employed Tax
---

# Why Is My Personal Allowance Less Than £12570 in 2026/27?

If you have reviewed your latest payslip or HMRC tax calculation and are asking, "why is my personal allowance less than £12570", the answer usually involves HMRC adjusting your tax code to collect tax on other income, recover debts, or restrict reliefs for high earners.

For the 2026/27 tax year, the government has maintained the standard tax-free threshold, but several statutory mechanisms can reduce the amount you actually receive. Here is an exhaustive guide explaining exactly why your personal allowance might be lower than the standard rate.

## The Standard £12570 Personal Allowance in 2026/27

To understand your reduced allowance, you must first confirm the baseline. Under section 10 of the Finance Act 2026, the government has frozen the standard Personal Allowance at £12570 for the 2026/27 tax year, and this freeze is legislated to remain in place up to and including the 2030/31 tax year.

If your personal allowance is less than this statutory £12570 figure, it is due to one of the following five reasons.

## Reason 1: Your Adjusted Net Income Exceeds £100,000

The most substantial statutory reduction applies to high earners. If your ["adjusted net income"](https://www.accountingfirms.co.uk/blog/childcare-benefit-and-the-tax-charge/) (your total taxable income before personal allowances, minus certain tax reliefs like pension contributions and Gift Aid) exceeds £100,000, you lose your personal allowance.

Under section 35(2) of the [Income Tax](https://www.accountingfirms.co.uk/blog/hmrc-payment-niers/) Act 2007 (ITA 2007), your allowance is strictly tapered away:

> "For an individual whose adjusted net income exceeds £100,000, the allowance under subsection (1) is reduced by one-half of the excess."

### The Taper Calculation

This means HMRC reduces your allowance by £1 for every £2 you earn over the £100,000 threshold.

- If your adjusted net income is **£110,000**, the excess is £10,000. HMRC reduces your allowance by £5,000, leaving you with a personal allowance of just **£7,570**.
- Once your adjusted net income reaches **£125,140**, the excess is £25,140. Half of this is £12,570, which completely wipes out the standard £12,570 allowance, leaving you with a personal allowance of **£nil**.

## Reason 2: You Receive Company Benefits in Kind (BiKs)

If you receive perks from your employer—such as a company car, private medical insurance, or a beneficial loan—these are taxable under the "benefits code" found in section 63 of the Income Tax (Earnings and Pensions) Act 2003 (ITEPA 2003).

Instead of sending you a separate tax bill for these benefits at the end of the year, HMRC "codes out" the tax by reducing your personal allowance.  HMRC deducts the cash equivalent value of the benefit directly from your £12,570 allowance. This generates a lower [tax code](https://www.accountingfirms.co.uk/blog/time-to-p45-the-p45/) (for example, a code dropping from 1257L to 800L), forcing your employer to deduct more tax from your cash salary to cover the cost of the benefit.

## Reason 3: HMRC is Recovering Underpaid Tax

If you underpaid tax in a previous tax year, HMRC often recovers the debt by reducing your current year's personal allowance.

Under Regulation 186 of the Income Tax (Pay As You Earn) Regulations 2003, HMRC has the statutory authority to adjust an employee's tax code to recover a tax difference, provided the underpayment is less than £3,000 and the taxpayer does not object.

By lowering your personal allowance, HMRC increases your taxable pay, effectively collecting the exact tax debt you owe incrementally across the 12 months of the 2026/27 tax year.

## Reason 4: You Have Untaxed Income (Savings, Dividends, or Property)

HMRC frequently reduces your personal allowance to collect tax on income that does not pass through a payroll system.

If you receive untaxed interest, foreign dividends, or [rental income](https://www.accountingfirms.co.uk/blog/friends-without-benefits/) from a property, HMRC includes this non-PAYE income in your tax code.  For example, if you receive untaxed savings interest that exceeds the Personal Savings Allowance, HMRC calculates the estimated tax due and reduces your personal allowance accordingly, ensuring the tax is collected smoothly via your main PAYE employment.

## Reason 5: You Transferred the Marriage Allowance

Finally, your personal allowance will be lower than £12,570 if you have voluntarily surrendered a portion of it to your spouse or civil partner.

Under section 55B of ITA 2007, a taxpayer who is not liable to pay tax at the higher or additional rate can elect to transfer exactly 10% of their personal allowance to their partner. For the 2026/27 tax year, 10% of £12,570 is £1,260. If you make this election, your personal allowance reduces to **£11,310**, while your partner receives a tax credit to reduce their overall liability.

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### Summary Table: Why Your Personal Allowance is Reduced

| Reason | Statutory Authority / Source | 2026/27 Impact on £12,570 Allowance |
| --- | --- | --- |
| **High Income Taper** | s 35(2) ITA 2007 | Reduced by £1 for every £2 earned over £100,000 (reaches £nil at £125,140). |
| **Benefits in Kind** | s 63 ITEPA 2003 ; PAYE12060 | Reduced by the cash equivalent value of the company benefit. |
| **Underpaid Tax Recovery** | Reg 186 PAYE Regs 2003 | Reduced to recover up to £3,000 of historic unpaid tax. |
| **Untaxed Income** | PAYE12060 | Reduced by the estimated tax due on savings, dividends, or property. |
| **Marriage Allowance** | s 55B ITA 2007 | Reduced by exactly £1,260 (10%) if transferred to a spouse. |

*Next steps: To find out exactly which of these adjustments applies to you, log into your Personal Tax Account on the HMRC website to view your 2026/27 PAYE Coding Notice. If you believe your estimated untaxed income or benefits in kind are incorrect, you should update your expected figures online to immediately correct your personal allowance.*