Payroll run right, every single payday.
Outsourced Payroll Services for UK Businesses
Payroll involves more than calculating salaries. PAYE, RTI, pension auto-enrolment, payslips and year-end reporting all need to line up every pay period. We manage the process so your employees get paid correctly and your payroll obligations stay on track.









Beyond offering services, we complement your journey with our commitment to Satisfaction
Our Payroll Services
Payroll is the one part of running a business where a small mistake lands directly on someone else's pay packet. Get it wrong once and you don't just have an HMRC problem, you have a team that's stopped trusting the business to pay them correctly.
Most payroll management errors aren't carelessness, they're software nobody's watching. We run PAYE, RTI submissions, and pension auto-enrolment as an active process through proper managed payroll services, checked against HMRC's deadlines every pay cycle, not a system left to run itself.
We've delivered payroll outsourcing for growing teams since 2008. The businesses that come to us mid-crisis almost always say the same thing, they didn't know auto-enrolment applied from employee one. We make sure you know before it becomes a problem, not after.
What We Offer
PAYE registration
Payroll software set-up
RTI submissions, including FPS and EPS
Payslip generation
P11D reporting
Pension auto-enrolment compliance
Year-end payroll reporting
Tailoring Success Across Industries
Mercurius delivers precise financial solutions backed by industry expertise, ensuring accurate and reliable results across all sectors.
Accounting, Tax and CPAs
Ecommerce and Retail

Law firms and Attorneys
Real Estate and Construction

Education and Coaching
Seeking custom services?
Drop your email, and we’ll get in touch, or contact us directly.
Why Outsource Your Payroll to Us?
Reliable Processing
Tax Compliance
Pension Support
Annual Reporting
Flexible Scheduling
Client Testimonials
Great work – love the dedicated member of the team that is assigned to work on my account.
Graham Blair
Habitat Seven Inc 🇨🇦
Manvi and the team at Mercurius are excellent. We have been working with them for a number of years and they have been pivotal in keeping our accounts in good order.
Cameron Kincaid
Chemeyes Ltd 🇬🇧
Siddhartha is delightful to work with and always completes assignments ahead of schedule and with no iteration needed.
Mike Schoenfeld
MBS Consulting🇺🇸
Pleasant to work with, knowledgeable on accounting principles, responsive
Christine Atieno
Keys Please Homes🇺🇸
Sid and his team so excellent work – on time and very attentive to detail.
Joel Cape
Joel E Cape, PLC🇺🇸
Why Mercurius?
100+ Ratings on Google
Experience the services that’s earned us top ratings.

Smart Savings
Senior accounting expertise without full-time salaries, benefits, or software overhead.

Total Safety
UK GDPR and data protection compliance built right into the process.

Dedicated Lead
A single accountant who knows your business inside and out.

Proactive Guidance
Our experts provide valuable insights and accounting services to help you make informed business decisions.
FAQs
What is payroll management?
Payroll management is the process of paying employees correctly and on time while meeting PAYE, HMRC, pension, and reporting requirements. It can include calculating deductions, submitting RTI reports, generating payslips, and managing pension auto-enrolment. With Maspartner, payroll management is handled as part of our outsourced payroll services, so the calculations, filings, and records stay connected.
What do payroll services include?
Payroll services can include PAYE registration, payroll software setup, RTI submissions, payslip generation, P11D reporting for benefits in kind, and pension auto-enrolment. The exact requirements depend on your employees and business structure. Maspartner’s outsourced payroll services cover these processes through one managed payroll setup.
Can I legally do payroll myself for just one employee?
Yes. You can run payroll yourself even if you have only one employee, but PAYE registration, RTI reporting, and pension auto-enrolment duties may still apply. The number of employees does not remove these responsibilities. For businesses that prefer to keep payroll outside their internal workload, payroll outsourcing provides an alternative.
What's the penalty if I get a payroll submission wrong or submit it late?
HMRC can charge penalties for late or incorrect payroll reporting, with the amount depending on the type of error and the circumstances. RTI submissions are generally expected on or before the day employees are paid. Using managed payroll services can help businesses keep track of submission dates, payroll records, and reporting requirements.
Do I have to pay employer's National Insurance on top of an employee's salary?
In most cases, yes. Employer’s National Insurance is a separate cost paid by the employer and is not deducted from the employee’s gross salary. It should therefore be included when calculating the overall cost of employing someone. Maspartner includes these calculations as part of its outsourced payroll services.
Does the minimum wage apply differently to directors paying themselves a small salary?
National Minimum Wage rules apply to workers and employees who meet the relevant criteria. Company directors can have different circumstances depending on their role and how they are paid, which is why a director’s salary should be reviewed alongside their wider tax position. This is an area where professional payroll management can help ensure salary payments are handled correctly.
What happens if I hire someone and forget to check auto-enrolment?
If an employee meets the eligibility requirements, you may need to automatically enrol them into a workplace pension and meet your duties as an employer. The Pensions Regulator can take enforcement action where an employer does not comply. As part of our payroll services, Maspartner can help businesses keep payroll and pension requirements aligned when employees join.
Can Maspartner take over payroll if I'm already midway through a tax year?
Yes. Maspartner can take over an existing PAYE scheme during the tax year, review the payroll records and submissions already made, and continue the required reporting. We can also reconcile previous payroll figures so the records remain consistent from the point of transition. This makes payroll outsourcing possible without waiting for the next tax year.






