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Case Study · 2024 – 2025Production Verified
Channel Islands Fintech & Operations

A custom payroll and workforce platform built for Sonnic Services in Jersey and Guernsey. It automates Channel Islands taxes, multi-site timesheets, direct bank clearing, and mobile staff access.

Client & RegionSonnic Services (Jersey & Guernsey)
Wiserve ScopeEnterprise Systems & Full-Stack Engineering
Delivery Timeline4 Months (2024 – 2025)
Core DisciplinesEnterprise Payroll · Channel Islands Tax & ITIS · BACS Banking Engine
Metric 01
< 5 minMonthly Pay Run DurationReduced from 4 full business days of manual collation
Metric 02
100%Statutory Tax AccuracyJersey ITIS & Social Security calculated with zero errors
Metric 03
Hex4WBACS Automated ClearingPre-formatted commercial bank batch exports with JSY/GSY routing
Metric 04
500+Active Field PersonnelSelf-service mobile portal access for cleaners & supervisors
01 / The Strategic Context

“
Standard UK payroll software assumes mainland tax rules and fixed offices. It fails quickly when managing hundreds of mobile staff across Jersey and Guernsey.
Channel Islands Enterprise Challenge

The Operational Bottleneck

Sonnic coordinates hundreds of cleaners and field supervisors working irregular shifts across client commercial premises in Jersey and Guernsey.

Before Wiserve, monthly payroll took four days of manual spreadsheet work. The finance team had to calculate Jersey taxes, Social Security rates, and overtime by hand, then manually type bank transfers.

Structural Inefficiency Matrix
01 / Channel Islands Tax RulesJersey ITIS tax rates and Social Security classes differ from UK PAYE, requiring custom tax math and government reporting.
02 / Multi-Site Shift RostersHundreds of cleaners working across client sites created messy spreadsheets, making overtime calculations slow and error-prone.
03 / Manual Bank TransfersDisbursing wages required compiling manual transfer sheets without direct bank clearing files.
02 / Architecture & Engines

Built for precise tax rules, multi-site staff rosters, and direct BACS bank clearing.

Channel Islands Statutory ComplianceModule 01 / 04

Statutory Tax & Social Security Engine

Calculates exact Jersey ITIS taxes, Social Security contributions, and pension deductions with instant government reporting.

Technical Architecture
Dynamic ITIS rate calculations for each employee
Social Security Class 1 and 2 rules with earnings caps
Separate tax formulas for Jersey and Guernsey
One-click Combined Employer Return reports
sonnic_payroll::tax-engine
Live Calculation
Jurisdiction Tax StandardJersey ITIS & Social Security
Employee Base Gross Pay£3,450.00 / month
Jersey ITIS Deduction (21.5%)- £741.75
Social Security (Class 1 Primary)- £207.00
Combined Employer ReturnGenerated · Ready for Export
Net Disbursable Pay£2,501.25
03 / Verifiable Impact

Key performance improvements compared to old manual workflows.

01 / 04
01 / Pay Run Execution

Monthly Pay Run Pipeline

< 5 Mins (98% Faster)
Legacy Process

4 business days of manual paper timesheet collation, overtime checks, and fixes.

Status: Replaced legacy workflow
Wiserve Solution

Under 5 minutes automated execution from raw Excel upload to final pay run ledger.

Live in Production Verified Result