Stephen Clinton

Rate Calculator

A small project to investigate python and agentic programming. I wanted to be able to compare rates across different roles and truly understand the take home pay including factors like pension contributions which other online calculators didn't provide. While I know some python and HTML this was an exercise in using both Anthropic and OpenAI agents to create the code based on my instructions about calculation and design.

Ltd Co Rate Calculator

Outside IR35. Salary plus dividends extraction.

Before Tax & Deductions

AssumptionsInputs used for this calculation.

Working Week

SettingValueNote
Number of days you work per week.
Used to calculate hourly equivalent rate only.
Hours per week
Unpaid holidays per year, excluding bank holidays.
Unpaid bank holidays per year.
Express the number of months per year you expect to be between contracts.
Billable weeks per year

Net Take-Home

Full BreakdownDetailed calculation for the selected display period.

Monthly Take-Home by Day Rate

Uses the current Ltd Co assumptions.

Umbrella Rate Calculator

Inside IR35. Assignment rate processed via umbrella PAYE.

Before Tax & Deductions

AssumptionsInputs used for this calculation.

Working Week

SettingValueNote
Number of days you work per week.
Used to calculate hourly equivalent rate only.
Hours per week
Unpaid holidays per year, excluding bank holidays. Holiday pay under umbrella does not add income — it is built into the assignment rate and redistributed by the umbrella.
Unpaid bank holidays per year.
Express the number of months per year you expect to be between contracts.
Billable weeks per year

Net Take-Home

Full BreakdownDetailed calculation for the selected display period.

Monthly Take-Home by Day Rate

Uses the current umbrella assumptions.

Full-Time Salaried Calculator

Direct employment. PAYE income tax and NI.

Before Tax & Deductions

AssumptionsInputs used for this calculation.

Working Week

SettingValueNote
Number of days you work per week.
Used to calculate the hourly equivalent rate only.
Hours per week
Paid holiday days per year, excluding bank holidays. UK statutory minimum is 20 days.
Public bank holidays per year. England & Wales has 8 statutory days plus 3 additional common holidays.
Worked weeks per year

Net Take-Home

Full BreakdownDetailed calculation for the selected display period.

Monthly Take-Home by Salary

Uses the current salaried assumptions.

Private Employer Calculator

PAYE salary with bonus, defined-contribution pension and flexible car benefits.

Before Tax & Deductions

Package OptionsConfigure working time, pension, bonus and car.

Working Week

SettingValueNote
Used for daily equivalents.
Used for hourly equivalents.
Paid annual leave, excluding bank holidays.
Paid public holidays.
Worked weeks per year

Net Take-Home

Full BreakdownCash pay, benefits, tax and pension.

Monthly Take-Home by Salary

Uses the current non-NHS package options, with 2026/27 NHS Agenda for Change salary bands for comparison.