Payroll. Done right.

Accurate, RTI-compliant payroll run on time, every pay date.

Zmartly runs your UK payroll end to end: RTI submissions to HMRC on or before every pay date, auto-enrolment pension assessments, and payslips your team can rely on. Your ACCA-qualified accountant handles starters, leavers, statutory pay and year-end so you avoid the late-filing penalties and contribution errors that catch most small employers. Fixed monthly pricing, no surprises.

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  • ACCA-qualified
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Our expertise covers

Everything in this service, in one bill.

  • 01

    RTI submissions (FPS & EPS)

    We file a Full Payment Submission to HMRC on or before every pay date and an Employer Payment Summary where needed to reclaim statutory pay or apply the Employment Allowance (up to £10,500 off your secondary Class 1 NIC bill in 2026/27). Late or missing FPS filings trigger automatic monthly penalties from £100, and we keep you clear of them.

  • 02

    PAYE, NIC & the new thresholds

    We calculate income tax and National Insurance against the current thresholds: the £12,570 personal allowance and £242/week primary threshold, with employer (secondary) Class 1 NIC at 15% on earnings above the £5,000-a-year secondary threshold. We reconcile your monthly PAYE liability so what you pay HMRC by the 22nd matches what we've reported.

  • 03

    Auto-enrolment & pension duties

    We assess every worker each pay period against the £10,000 earnings trigger, enrol eligible jobholders, and calculate contributions on qualifying earnings (the £6,240-£50,270 band) at the statutory minimum of 8% total, including 3% employer. We manage opt-ins, opt-outs and your three-yearly re-enrolment, and file the Declaration of Compliance with The Pensions Regulator.

  • 04

    Statutory pay: SSP, SMP, SPP & more

    We administer Statutory Sick Pay (£118.75 a week for up to 28 weeks in 2025/26, uprated each April) and family leave pay, Statutory Maternity, Paternity, Adoption and Shared Parental Pay at £187.18 a week or 90% of average weekly earnings if lower. We reclaim the recoverable element (92%, or 103% under Small Employers' Relief) through your EPS so you're not out of pocket.

  • 05

    Starters, leavers & National Minimum Wage

    We process new starters from their P45 or starter checklist, issue P45s for leavers, and check every payslip against the National Living Wage of £12.21 an hour (age 21+) to keep you off HMRC's NMW naming list. We handle student loan deductions, attachment of earnings orders, and benefits in kind via payrolling where you've registered.

  • 06

    Year-end, P60s & P11D benefits

    We complete your payroll year-end, file the final FPS, and issue P60s to all employees by 31 May. We prepare P11D and P11D(b) returns for benefits in kind by 6 July and calculate the Class 1A NIC (15% in 2026/27) due by 22 July. From April 2026 most benefits in kind move to mandatory payrolling, and we'll have you ready for the switch.

Why it pays off

What you actually get.

  • A named, ACCA-qualified accountant

    You deal with one named accountant who knows your payroll, not a call-centre queue. ACCA-qualified and up to date with each April's rate and threshold changes, so your filings are right first time.

  • On-time RTI, every pay date

    FPS filing on or before pay date is non-negotiable for us, that's what keeps you clear of HMRC's automatic late-filing penalties. We reply to queries within 72 hours so nothing stalls before payday.

  • Fixed, transparent pricing

    Payroll sits within our fixed monthly plans at £99, £199 or £499, no per-payslip surprises and no year-end surcharge. Rolling monthly terms, so you're never locked in, backed by our 30-day money-back guarantee.

  • Works with your software

    We run payroll alongside Xero, QuickBooks, FreeAgent or Sage, syncing wages, PAYE and pension postings straight into your books so your accounts and payroll always reconcile.

  • Pension and compliance handled

    Auto-enrolment assessments, contribution uploads, re-enrolment and the TPR Declaration of Compliance are all included, the admin that quietly trips up most small employers, done for you.

How much do payroll services cost, and is outsourcing cheaper than doing it in-house?

For most small employers, outsourcing payroll costs less than running it in-house once you count the real price of doing it yourself. The visible cost is software, an hour or two of admin each pay run, and the cost of the person doing it. The hidden cost is the penalty exposure: HMRC charges an automatic monthly penalty for every late Full Payment Submission, and those add up fast across a tax year.

Our payroll sits inside fixed monthly plans, so the price does not move with the number of pay runs or jump at year-end. You are paying for the filing being right and on time, not by the hour. The table below shows what HMRC charges per month when an FPS is late, which is the cost most in-house setups quietly carry.

There is also a saving most employers miss. The Employment Allowance lets eligible businesses cut their secondary Class 1 National Insurance bill by up to £10,500 in 2026/27, claimed through your Employer Payment Summary. We claim it correctly from the first pay run so it is not left on the table, and we confirm you are still eligible each year, because the rules exclude some single-director companies.

If you want to compare your current in-house cost against a fixed monthly plan, book a free Tax Health Check and we will run the numbers on your actual headcount.

Number of employeesHMRC late-filing penalty per month (2026/27)
1 to 9£100
10 to 49£200
50 to 249£300
250 or more£400

See also: Employer National Insurance for 2026/27Book a free Tax Health Check

What does a monthly payroll run actually involve, and when do the deadlines fall?

A monthly payroll run is a fixed sequence tied to two HMRC deadlines: the Full Payment Submission on or before each pay date, and the PAYE payment by the 22nd of the following month if you pay electronically (the 19th if you pay by post). Miss the first and you risk a late-filing penalty. Miss the second and HMRC charges interest and can add late-payment penalties.

Each cycle we collect your variable inputs (hours, overtime, bonuses, starters and leavers), calculate gross to net, run the auto-enrolment pension assessment, and file the FPS to HMRC before payday. We then tell you the single figure to pay HMRC and the date it is due, so there are no surprises mid-month.

A worked example. Take one employee on an annual salary of £30,000, paid monthly. That is £2,500 gross a month. Income tax is charged once pay passes the £12,570 personal allowance, and employee National Insurance once weekly pay passes the £242 primary threshold. On the employer side, secondary Class 1 NIC is 15% on earnings above the secondary threshold of £96 a week (around £5,000 a year). Before the Employment Allowance, that employer NIC is roughly £3,750 across the year on this salary. If you are eligible for the Employment Allowance, the first £10,500 of that secondary NIC bill is wiped out, so a small employer with one or two staff often pays no employer NIC at all.

If you run payroll less often, there is relief on the payment side too. Employers who usually owe HMRC less than £1,500 a month can ask to pay PAYE quarterly rather than monthly, which eases cash flow. We confirm whether you qualify and arrange it.

See also: How PAYE and NIC thresholds work for directors

Can I switch payroll provider mid-year, and how do you avoid breaking my RTI record?

Yes, you can change payroll provider at any point in the tax year, not just in April. The work is in carrying your year-to-date figures across cleanly so HMRC's Real Time Information record stays continuous and your employees' tax and National Insurance keep calculating correctly.

We take over by collecting your latest FPS, the year-to-date pay, tax, NIC and pension figures for every employee, your PAYE reference and Accounts Office reference, and your pension scheme details. We reconcile those figures before the first run we file, so the cumulative totals on each payslip pick up exactly where your old provider left off. Done properly, your staff see no change on their payslip and HMRC sees no gap.

The common failure when employers switch is a duplicated or missing FPS, which throws out an employee's tax code and triggers either an overpayment or an unexpected deduction the next month. We avoid that by confirming with you which provider files the FPS for the changeover month, so it is filed once and only once.

Mid-year is often the right time to move if your current payroll is late, error-prone, or silently costing you penalties. We can run the first cycle alongside your existing setup as a parallel check before fully taking over.

See also: Talk to us about switching payroll

What should I look for when choosing a payroll service for a small business?

Look for three things: on-time RTI filing as a hard commitment, a named person who actually knows your payroll, and pricing that does not move with your headcount or spring a year-end surcharge. Payroll is unforgiving because the deadlines are automatic and the penalties land without warning, so reliability matters more than features.

Ask any provider how they handle the awkward cases, because that is where in-house payroll and cheap software fall down. Statutory sick and family leave pay, student loan deductions, attachment of earnings orders, payrolling benefits in kind, and the auto-enrolment re-enrolment that comes round every three years are all routine for us and all easy to get wrong. From April 2026 most benefits in kind move to mandatory payrolling, which changes how company cars and similar perks are reported, so your provider should already be set up for it.

If you employ subcontractors in construction, payroll is not the whole picture. Some workers belong on PAYE and some under the Construction Industry Scheme, and getting the employment status wrong is one of the most expensive mistakes HMRC pursues. We assess status correctly and run both where needed.

Finally, check that payroll talks to your accounts. We post wages, PAYE and pension figures straight into Xero, QuickBooks, FreeAgent or Sage, so your books and payroll always reconcile rather than drifting apart and creating a year-end clean-up.

See also: CIS vs PAYE: getting employment status rightConstruction payroll and CIS guide for 2026

How we deliver

Four steps from first call to filed.

  • 01

    Discovery

    Understanding your business needs.

  • 02

    Solution Design

    Crafting your custom accounting strategy.

  • 03

    Onboarding

    Quick and easy integration.

  • 04

    Regular Rhythm

    Consistent monitoring and reporting.

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Common questions

Frequently asked questions.

A Full Payment Submission (FPS) has to land with HMRC on or before the day employees are paid. Miss that window and HMRC issues a late-filing penalty starting at £100 a month for businesses with 1-9 employees, scaling up by headcount. We run FPS and EPS submissions on the morning of each pay run so the deadline is hit automatically, not chased.

Payroll runs at £4 per payslip per pay run, with no separate setup fee for new starters or leavers. That includes RTI filing, payslip delivery, P45s, P60s, pension contribution files, and HMRC liaison. Most clients fold it into a fixed monthly accounting package rather than paying it as a standalone line.

Yes. Operations teams on weekly, salaried staff on monthly, and directors on annual are common in the same client. Each frequency is set up as its own pay schedule in the payroll software, with separate RTI submissions but consolidated reporting at year end. There is no per-schedule premium.

Yes, and most clients who switch to us do exactly this. We collect year-to-date pay, tax, NI, pension, and student loan figures from your current provider, load them into the new system, and reconcile against your last FPS so HMRC sees a clean continuation. We have done mid-year migrations as late as month 11 with no employee disruption.

Yes - all statutory payments are calculated, processed through the pay run, and reclaimed from HMRC where eligible (small employers can recover 103% of statutory family-leave pay). We track qualifying weeks, average weekly earnings, and notification dates so you do not lose recoveries through missed paperwork.

Zmartly Ltd20-22 Wenlock Road, London N1 7GU020 8175 5145info@zmartly.co.uk
Free · 30 minutes · No obligation

Stop overpaying tax. Start filing in 5 days.

Thirty minutes with an ACCA-qualified accountant. Most owners uncover £1,000-£3,000 in annual savings on the first call. If we are not the right fit, you walk away with a free tax review on the house.

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