What is a typical day rate uplift needed to go Inside IR35?

Contractors typically need an increase of 15% to 25% in their day rate when moving from Outside to Inside IR35 to maintain identical take-home pay.

Can business expenses be claimed Inside IR35?

Generally no, travel, subsistence, and equipment expenses cannot be deducted under an Inside IR35 umbrella contract due to supervision, direction, or control rules.

Who determines IR35 status for UK contracts?

For medium and large private sector clients and all public sector clients, the end client is legally responsible for issuing a Status Determination Statement (SDS).

Finance100% Free & Browser-Safe🇬🇧United Kingdom (GB)💵£ (GBP)📜Off-Payroll Working Rules (Chapter 10 ITEPA)

Inside vs Outside IR35 Calculator

Compare UK contractor take-home pay between Outside IR35 Ltd company dividends and Inside IR35 umbrella PAYE under Chapter 10 ITEPA.

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Input Parameters

Contractor Day Rate (£)

Working Days per Year

Days

Annual Business Expenses (£)

Umbrella Monthly Fee (£)

Calculated Results

● Live Update

Net Take-Home (Outside IR35)

£87,669

Net Take-Home (Inside IR35)

£77,673

Annual Difference (Outside Advantage)

£9,996

Required Inside Day Rate to Break Even

£677

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1How to Use Inside vs Outside IR35 Calculator

The UK Off-Payroll Working rules (Chapter 10 ITEPA / IR35) determine whether a contractor is taxed as an employee or a business, significantly impacting annual net pay.

Step 1.Enter your standard contractor day rate in GBP (£).
Step 2.Enter expected annual working days (standard: 220 days).
Step 3.Enter annual deductible business expenses for Outside IR35.
Step 4.Compare net take-home pay and see the required Inside rate to break even.

2Formulas, Methodology & Key Features

IR35 Pay Comparative Formulas

Outside IR35 extracts profits via tax-efficient salary and dividends. Inside IR35 subjects the contract value to Employer NI, Apprenticeship Levy, and employee PAYE/NI:

Outside Net = Salary (£12,570) + (Profit - CorpTax - DividendTax) Inside Net = (Gross - Umbrella - Employer NI - Levy) × (1 - PAYE/NI Rate)

3IR35 Day Rate Take-Home Comparison Matrix (£)

Day Rate (£)	Net Outside IR35 (£)	Net Inside IR35 (£)	Net Loss Inside (£)	Day Rate to Match (£)
£350 / day	£53,100	£46,200	£6,900	£402 / day
£500 / day	£73,800	£65,400	£8,400	£564 / day
£650 / day	£94,500	£83,900	£10,600	£732 / day
£800 / day	£114,800	£101,200	£13,600	£908 / day

?Frequently Asked Questions (FAQ)

Common questions answered about Inside vs Outside IR35 Calculator.

Inside IR35 treats contract revenue like employment income, requiring payment of Employer National Insurance (13.8%) and Apprenticeship Levy (0.5%) before personal PAYE.

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