The seven techniques
In order of typical effort-to-saving ratio:
1. Correct a wrong tax code (highest single saving)
Your tax code determines how much tax-free personal allowance HMRC applies. The standard 2026/27 code is 1257L for rest-of-UK earners with one job and no special circumstances.
Wrong codes that commonly cost real money:
- BR (basic rate) on your only job — costs ~£2,500/year on a £30,000+ salary
- K codes higher than your actual benefits — costs vary depending on how much HMRC has added
- Lower 1057L, 957L codes — usually because HMRC has stale benefit-in-kind data
How to check: log in to gov.uk/personal-tax-account. The system shows your current tax code and the reasoning. If something looks wrong, you can update it directly.
For the specific code on your payslip, the Tax Code Checker explains what it means.
Approximate saving: £200-£2,500/year, depending on how wrong the code was.
Effort: 30 minutes online via Personal Tax Account.
2. Capture the full employer pension match (largest "free money")
Almost every UK workplace pension scheme has an employer match. Common patterns:
- Match up to 5% of salary — you pay 5%, they pay 5%
- Match up to 4% with 1% base — 1% from them regardless, plus matching above
- Match up to 6% with stepped tiers
If you're currently contributing below the match cap, every percentage point below is unclaimed employer money. For a £40,000 salary with a 5% match and you contributing 3%, increasing to 5% adds your 2% (£800) plus the employer's 2% (£800) = £1,600/year to your pension.
The pension is locked until age 55 (rising to 57) — but the employer match is the closest thing to a guaranteed return in personal finance.
Approximate saving: 2-15% of salary going to long-term wealth.
Effort: usually a 5-minute HR portal change. Effective from next pay period.
3. Use salary sacrifice for pension contributions
If your pension contribution is currently via relief at source or net pay arrangement, switching to salary sacrifice (where available) adds the NI saving on top:
- Basic-rate taxpayer: 8% NI saved on the sacrificed amount
- Higher-rate taxpayer: 2% NI saved (because earnings above £50,270 are at the 2% NI rate)
For a £40,000 salary contributing 5% (£2,000), switching to salary sacrifice saves an extra ~£160/year via NI. Modest in absolute terms but compounding over a career.
Approximate saving: 2-8% of pension contribution per year.
Effort: HR conversation. Some employers offer it as default; others require a contract variation.
4. Claim higher-rate pension tax relief via Self Assessment (commonly missed)
If you're a higher-rate taxpayer (above £50,270) and your pension uses relief-at-source (most personal pensions and many modern workplace schemes), only 20% basic-rate relief is automatic. The extra 20% must be claimed via Self Assessment.
HMRC estimates billions of pounds of higher-rate relief goes unclaimed annually. For someone contributing £6,000/year to a SIPP and earning above £50,270, the unclaimed relief is £1,200/year.
The claim:
- File Self Assessment by 31 January following the tax year
- Declare your gross pension contributions
- HMRC refunds the relief (typically as a tax code adjustment or one-off refund)
- You can backdate up to 4 years
Approximate saving: £1,000-£3,000/year for typical higher-rate earners with moderate pension contributions.
Effort: 30-60 minutes annually for Self Assessment, or 15 minutes for a direct HMRC letter if you don't file SA.
5. Claim Marriage Allowance (couples only)
If you're married or in a civil partnership AND one of you earns under £12,570 AND the other is a basic-rate taxpayer, Marriage Allowance lets the lower earner transfer £1,260 of personal allowance to the higher earner.
Saving: exactly £252/year for the household.
You can also backdate up to 4 years — so a one-off claim made now could recover up to £1,260 for previous years.
The Marriage Allowance Checker confirms eligibility and walks through the claim.
Approximate saving: £252/year, plus up to £1,260 in backdated reclaim.
Effort: 20 minutes online application at gov.uk.
6. Shield savings in ISAs
For UK earners with savings or investments outside tax-protected wrappers, moving them into ISAs can save substantial tax:
- Cash ISA: interest tax-free vs taxed above the Personal Savings Allowance (£1,000 basic-rate, £500 higher-rate, £0 additional-rate)
- Stocks & Shares ISA: growth and dividends tax-free vs taxed above the £500 dividend allowance and standard CGT rules
Annual ISA allowance for 2026/27: £20,000 per individual.
For higher-rate taxpayers with substantial taxable interest or dividends, full ISA usage saves hundreds or thousands per year.
Approximate saving: £100-£2,000/year for typical higher-rate earners with significant non-ISA savings.
Effort: open ISA accounts, transfer existing savings (within annual allowance limits).
7. Reclaim P800 overpayments
HMRC calculates each tax year's position after the year ends. If you've overpaid (often via emergency-basis PAYE, mid-year tax code corrections, or one-off bonus situations), they issue a P800 letter with the refund amount.
But P800 letters are mailed and easy to miss. To check directly:
- Log in to gov.uk/personal-tax-account
- Click "Check your Income Tax"
- Select the tax year (you can check back to 2020/21)
- The system shows your tax position and any overpayment due
Approximate saving: £50-£1,500 for typical employees who've had a mid-year code change.
Effort: 10 minutes to check via Personal Tax Account.
Putting it together
A worked example: someone on £55,000 salary in 2026/27, married to a partner earning under £12,570, currently contributing 3% pension via relief-at-source (employer match cap is 5%):
| Action | Annual saving |
|---|---|
| Increase contribution to 5% to capture full match | +£1,100 employer money to pension |
| Switch contribution to salary sacrifice | +£60 NI saving |
| Claim higher-rate pension relief via Self Assessment | +£550 |
| Claim Marriage Allowance | +£252 |
| Total annual improvement | ~£1,960 + £1,100 in pension |
That's roughly 4% of gross salary recovered via specifically statutory mechanisms — no aggressive planning, no avoidance, all on official HMRC forms.
What this isn't
Not in scope of this article: aggressive tax planning, offshore structures, complex avoidance schemes. The seven techniques above are mainstream UK statutory mechanisms — used by millions of UK earners, fully documented at gov.uk, no edge cases or grey areas.
For higher-impact moves (changing employer, career change, side income), see how to increase your salary. For the broader budgeting and disposable income angle, see how to create a budget from your payslip.
In short
Most UK employees have £500-£3,000/year of improvable take-home — usually concentrated in tax code corrections, missed pension relief claims, and unclaimed Marriage Allowance. Each takes minutes to address. The biggest single category is higher-rate pension relief, which is structurally easy to miss when pension contributions are via relief-at-source schemes.