Half your delivery capacity is contractors, and BambooHR has no idea they exist
When a Reading IT-services or software firm runs half its delivery on contractors and BambooHR or Workday only sees the permanent staff, custom HR (Human Resources) software closes the gap. Budget £50k to £120k over 3 to 6 months, with the contractor and IR35 register live in about 10 weeks.
BambooHR, Workday, Gusto and ADP are built around permanent employees. The Thames Valley talent market doesn't work that way: a large share of delivery capacity is contractors on day rates with IR35 determinations that carry real HMRC liability. Off-the-shelf HR tools have no clean place to hold an inside-IR35 status, an assignment end date, or a day rate that feeds billing.
So contractor data ends up in a spreadsheet beside the HR system, and the two drift. When HMRC asks how you determined a contractor's status, or when finance needs to know who rolls off next month, the answer lives in someone's inbox rather than a system.
What breaks first in Reading
- BambooHR has no proper model for contractors, day rates or IR35 status
- IR35 determinations live in spreadsheets with no audit trail for HMRC
- Assignment end dates aren't tracked, so finance can't plan capacity
- Day rates don't feed billing, so utilisation and margin stay manual
The fix: hr built for Reading, not rented
Custom HR software models your whole workforce, permanent and contract, with IR35 status, day rates, assignments and end dates as first-class data. It keeps an audit trail HMRC accepts, feeds rates into billing and your ERP (Enterprise Resource Planning), and gives finance a real view of who rolls off when. The parallel contractor spreadsheet disappears.
What hr costs in Reading
| Project scope | Typical cost | Timeline |
|---|---|---|
| Contractor and IR35 module beside existing HR | £40k to £70k | 3 to 4 months |
| Full custom HR for a contractor-heavy firm | £80k to £120k | 4 to 6 months |
| IR35 register and audit trail only | £30k to £55k | 2 to 4 months |
The capability list that earns its budget
What we build under HR in Reading
Everything an HR build here can cover: performance management software, custom HR software, HRIS development, payroll software, employee onboarding system and time and attendance.
Exactly what you get
An HR system that finally sees your whole Thames Valley workforce: permanent staff and the contractors who make up a big slice of delivery, with IR35 status, day rates and assignments as proper data. It keeps an audit trail HMRC accepts, feeds rates into billing and your ERP, and tells finance who rolls off next month. The contractor spreadsheet retires.
How to choose a developer in Reading
Choose a team that understands UK contractor reality, because IR35 and assignment tracking are the whole reason off-the-shelf HR fails here. Ask how they model a status determination and keep its history for HMRC. Confirm day rates flow into billing and your ERP, and that sensitive personal data is properly secured. A developer who's worked with Thames Valley services firms will know this terrain.
- !They don't ask about IR35, ask how they model inside-versus-outside status
- !No audit trail in scope, ask how HMRC would see a determination's history
- !They skip billing integration, ask how day rates reach finance
- !No data-protection plan, ask how sensitive records are secured
- !They treat contractors as employees, ask how assignments and end dates work
Teams investing in hr in Reading usually scope it next to pos, warehouse management, helpdesk & ticketing, since these systems share data and budgets.
Rohan advises mid-market and enterprise teams on ERP, CRM and custom software, and has led delivery on dozens of business-software builds.
Writes for Digital Heroes, shipping business software for 2,000+ brands across 55+ countries since 2017.
Frequently asked questions
Why can't BambooHR or Workday handle our contractors?
They're built around the permanent-employee lifecycle: salaries, holidays, reviews. Contractors need day rates, assignment dates and IR35 determinations with an audit trail, none of which those tools model cleanly. So contractor data leaks into a spreadsheet, which is exactly the risk custom HR removes.
How do you handle IR35 audit requirements?
The system records each determination, who made it, when, and on what reasoning, with versioned history. If HMRC asks how you decided a contractor was inside or outside IR35, the answer is in the system rather than an inbox, which is the difference between a clean review and a painful one.
Can day rates feed our billing and ERP?
Yes, and that's a major benefit. When a contractor's day rate lives in HR and flows to billing and your ERP, utilisation and margin become automatic rather than a manual reconciliation, which ties directly into the project-accounting problems firms face.