September marks the halfway point of the 2026/27 tax year. If you work through an umbrella company as an IT contractor, nurse, locum doctor, driver, or other contractor, now is the time to review your finances and make adjustments before the tax year ends next April.

Here is our 7-point mid-year check that helps you spot errors, maximise tax efficiency, and make the most of your contractor arrangements.

1. Check Your Tax Code

Your tax code determines how much tax your umbrella company deducts from your pay. An incorrect code means you could be paying too much or too little tax.

How to Check

Log in to your HMRC Personal Tax Account to view your current tax code. You can also check your latest payslip or P60. The most common tax code for 2026/27 is 1257L, which provides the standard Personal Allowance of £12,570 (that’s the maximum amount you can earn in a tax year before you start paying income tax).

What the Letters Mean

Different letter codes indicate different tax situations:

• L = standard Personal Allowance
• BR = all income taxed at basic rate (20%)
• D0 = all income taxed at higher rate (40%)
• W1 or M1 = emergency tax code (temporary)

Emergency codes often occur when you start a new contract or change umbrella companies, and you cannot provide your new employer with a P45, for example. These codes ignore your Personal Allowance and may result in overpayment.

What to Do If It’s Wrong

If your tax code is incorrect, you can update your details through your Personal Tax Account. If you need help, contact HMRC on 0300 200 3300 with your National Insurance number and recent payslips.

HMRC will issue a revised code to your umbrella company, who will adjust your tax deductions. If you’ve overpaid, you’ll receive a refund through your payslip or directly from HMRC.

2. Review Your Earnings

Mid-year is the time to assess your earnings to date and project what you’ll earn for the remainder of the tax year.

Pull your payslips from April 2026 to date. Calculate your total gross income and take-home pay. Compare this to your target annual income.

If you’ve earned less than expected, consider taking on additional contracts or increasing your hours. If you’ve earned more, you may be moving into a higher tax bracket (40% over £50,270 or 45% over £125,140). Understanding your position helps you plan for salary sacrifice, pension contributions, or other tax planning strategies.

This umbrella contractor tax review 2026 ensures you have accurate data for financial decisions in the months ahead.

3. Pension Salary Sacrifice (Brief Recap)

Pension salary sacrifice can reduce your National Insurance contributions and increase your take-home pay while building retirement savings. Under this arrangement, you agree to reduce your gross salary in exchange for an employer pension contribution.

The National Minimum Wage Floor

Your salary after sacrifice cannot fall below the National Minimum Wage (NMW). This creates a floor for how much you can sacrifice. As NMW rates rise, the amount available for sacrifice may reduce, particularly for lower-paid contractors.

Full Details in July 2026 Guide

We published a comprehensive guide to contractor pension review 2026/27 in July 2026. That guide covers:

• How salary sacrifice works in detail
• Calculation examples
• NMW compliance
• Tax and NIC savings
• How to set up or adjust your arrangement

If you haven’t reviewed your pension arrangements this year, or if your circumstances have changed, consult that guide or speak to your designated business manager.

4. Mileage Claims Update: New 55p Rate

In April 2026, HMRC increased the Approved Mileage Allowance Payment (AMAP) rate for cars and vans from 45p to 55p per mile for the first 10,000 business miles. The rate remains 25p per mile for mileage over 10,000 miles.

This change is backdated to 6 April 2026, the start of the current tax year, and we published a comprehensive guide on this back in May.

What This Means for You

If you’ve submitted mileage claims since April 2026 at the old 45p rate, you’re entitled to an additional 10p per mile for those journeys. Contact your umbrella company’s payroll team to request a recalculation.

For example, if you’ve claimed 3,000 business miles since April at 45p, you’re owed an additional £300 (3,000 miles x 10p).

Going forward, use the 55p rate for the first 10,000 miles on all new mileage claims. Keep accurate records of your business journeys, including:

• Date of journey
• Start and end postcodes
• Business purpose
• Miles travelled

Motorcycles remain at 24p per mile, and bicycles at 20p per mile. You can also claim an additional 5p per mile for each fellow employee you carry on a business journey.

5. Review Holiday Pay Entitlement

As an umbrella employee, you’re entitled to 28 days of paid holiday per year (5.6 weeks). This is your statutory minimum under UK employment law.

Are You Using Your Entitlement?

Many contractors fail to take their full holiday allowance, particularly if they’re used to working as a limited company director or sole trader. Unlike those structures, as an umbrella employee you accrue holiday pay, and you should use it.

Holiday entitlement typically runs on a calendar-year basis (January to December), as at SmartWork, though some umbrella companies use the tax year. Check your contract or payslips to confirm your holiday year.

If you haven’t taken holiday this year, calculate how many days you have left. If you have accrued holiday that will expire at year-end, book time off or request payment for unused days if your umbrella company allows it.

Taking regular breaks is not just a legal right; it also supports productivity and wellbeing on long contracts.

6. Contractor Mortgages: Autumn Market Activity

Autumn is traditionally a busy period in the property market. If you’re considering buying a home or remortgaging, contractor income can present challenges with high-street lenders who may not understand umbrella employment structures.

SmartWork has partnered with Freelancer Financials, specialist mortgage advisors who work exclusively with contractors, freelancers, and self-employed professionals. They understand how umbrella pay structures work and can access lenders who accept contractor income.

Whether you’re a first-time buyer, moving home, or remortgaging, our friends at Freelancer Financials can provide tailored advice and access to competitive rates.

Visit this exclusive link for a SmartWork special offer, or contact your SmartWork business manager to arrange an introduction or request more information about accessing this service.

7. Private Pensions and Investments

Beyond workplace pension arrangements, mid-year is a good time to review your private pension contributions and investment portfolio.

SmartWork has partnered with Interactive Investor, one of the UK’s leading investment platforms, to give contractors access to a range of investment options including:

• Self-Invested Personal Pensions (SIPPs)
• Stocks and Shares ISAs
• General Investment Accounts
• Funds and ETFs

If you’ve had a strong earning period, consider whether you can make additional pension contributions to maximise tax relief (you receive relief at your marginal tax rate). The annual pension allowance for 2026/27 is £60,000.

Reviewing your investment strategy now, rather than in March when the tax year-end rush begins, gives you time to make considered decisions.

Contact Interactive Investor and see their special offers through this unique link they set up for SmartWork.

Take Action Now

A mid-tax-year financial review puts you in control. By checking your tax code, updating mileage claims, reviewing holiday pay, and assessing pension and investment options, you can optimise your contractor finances for the remainder of 2026/27.

This checkup takes a few hours but can result in hundreds or thousands of pounds in additional take-home pay, tax savings, or recovered entitlements. If you wait until April 2027 to discover you’ve missed opportunities or paid incorrect tax, it might be too late by then.

Contact your designated SmartWork business manager to discuss any of these areas in detail or to arrange introductions to our specialist partners for mortgages and investments.

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This document is for general information only and does not constitute financial, tax or legal advice.