7. May 2026
Are You Accidentally Paying Below Minimum Wage? A Hidden Risk for Charities and SMEs
Do you have staff on a salary below £26,310 who work 37.5 hours a week? There’s a high probability you are at risk of underpaying the National Minimum Wage (NMW), even if your annual contract looks compliant.
There’s a good chance you’re at risk of underpaying the National Minimum Wage even if you think you’re compliant.
HMRC has been naming, shaming, and fining charities and businesses for this exact mistake, often clawing back five years of arrears. For those seeking Charity HR guidance, this is currently one of the most significant hidden financial risks.
In this guide, I'll provide essential HR support for charities and SMEs to help you audit your payroll before HMRC does.
Why "Above Minimum Wage" Isn't Always Safe
On paper, the math for the 2026 National Living Wage seems straightforward:
£12.71 per hour × 37.5 hours per week × 52 weeks = £24,784.50 annual salary
So employers think “We pay £24,800, so we’re covered.”
Many employers think paying £24,800 covers them. It doesn’t. HMRC doesn't calculate compliance annually; they look at the Pay Reference Period (usually monthly).
A pay reference period is the actual monthly hours worked, divided by the actual pay received that month.
If a month has more working days than average, your "fixed" salary stays the same, but the hours go up. This causes the effective hourly rate to drop, potentially falling below the legal limit of £12.71.
2026 Working Day Variations – Why Salaried Workers Are at Risk
In 2026:
Not all months are created equal. The above calculation assumes that there's 21 working days each month. However;
- 5 months have 21 or less working days (you’re usually safe)
- 7 months have more working days (you are at risk)
That means a salary that appears compliant on an annual basis can fall below the minimum wage on a month-by-month basis.
HMRC Guidance: No Room For Error
According to HMRC, the law is very clear on how employers must manage payroll:
“Every hour worked in a pay reference period must be paid at or above the National Minimum Wage. Employers must not rely on annualised or averaged calculations.”
Source: https://www.gov.uk/minimum-wage-different-types-work/paid-by-the-hour
HMRC has publicly listed employers, including charities, for failing to meet this requirement.
They don’t care if it was a mistake.
They don’t care if the employee never complained.
If your calculations are wrong, you could be fined up to 200% of the error, back-pay will be ordered, and your organisation can be publicly named.
National Minimum Wage Rates (Effective April 2026)
National Living Wage (21+) - £12.71
Age 18–20 - £10.85
Under 18 & Apprentices - £8
This article focuses on the £12.71 rate, as most salaried full-time employees in charities fall under the National Living Wage category.
Example: A Salary That Fails The Test
Employee A
Salary: £24,800 per year
Weekly hours: 37.5 (7.5 hours per day)
Paid monthly
In April (with 21 working days):
Monthly hours = 165
£24,800 ÷ 12 = £2,066.67 per month
Effective hourly rate = £2,066.67 ÷ 165 = £12.53 (Below Minimum Wage).
This is BELOW minimum wage – you are now in breach.
In October (with 23 working days):
Monthly hours = 172.5
Effective hourly rate = £2,066.67 ÷ 172.5 = £11.98
This is BELOW minimum wage – you are now in breach.
Why This Matters for the Charity Sector
For the non-profit sector, this is more than a payroll admin error; it is a governance issue. Specialist HR support for charities is vital because a single HMRC enforcement notice can:
- Erode Donor Trust: Supporters want their money going to the cause, not government fines.
- Trigger Regulatory Reviews: It can lead to audits by the Charity Commission.
- Damage Recruitment: Being "named and shamed" makes it harder to attract talent in a competitive Charity market.
How To Protect Your Charity
To remain compliant, you must calculate effective hourly rate each month using:
Formula: Monthly salary ÷ (Working days × Daily hours)
If the result is below £12.71, you are in breach.
To make this easier, I’ve created a ready-to-use Excel Compliance Checker that automatically calculates this for all months in 2026 and flags breaches in red.
Email me here (Paul@verdantpurpose.com) to get a copy, and just put 'WAGE CHECK' as the subject line.
Need some help? Book a 30-Minute Minimum Wage Compliance Check
I’ll review your salaries, contracts, and working patterns, and confirm whether your organisation is fully compliant. Includes: risk analysis, recommendations, and practical fixes you can implement immediately.
Don’t wait for an audit. Review your Charity HR practices today, protect your mission, and ensure your staff are paid legally.
Frequently Asked Questions
1. Does minimum wage apply to salaried employees?
Yes. HMRC calculates minimum wage based on hours worked in each pay period, even for salaried workers.
2. Can I average salary payments across the year?
No. Each month must stand alone. If an employee works more hours in a given month, their effective hourly rate must still meet or exceed the minimum wage.
3. What happens if I underpay the minimum wage accidentally?
You will be required to pay the difference, plus penalties of up to 200% of arrears. HMRC may also publicly name your organisation as non-compliant.
4. How far back can HMRC investigate?
Up to six years. Many recent cases have gone back five years with back pay demanded for every affected employee.
5. Are charities exempt from minimum wage rules?
No. Charities must comply in the same way as any other employer.
6. What salary is required to guarantee compliance?
In 2026, a full-time employee working 37.5 hours per week needs to earn at least £26,309.70 annually without any pre-tax deductions to ensure minimum wage compliance in all months.
In Conclusion...
This is one of those hidden HR risks that doesn’t show up until it’s too late.
Most charities think they’re compliant because they look at annual salary.
HMRC looks at every single month.
Don’t wait for a fine or a reputation crisis. Get HR Support for your Charity before your risks are exposed.
- Get the wage checker tool.
- Audit your salaries.
- Protect your staff, your trustees, and your mission.
Want it sorted?
Email me here to get a copy, and just put 'WAGE CHECK' as the subject line.