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Contractor Gap Calculator

Model weeks without work and booked contract duration, showing revenue and tax-year income without assuming renewal.

Tax year 2026/27 · Last verified · Methodology · Official sources

Budget for time between contracts

2026/27

Your estimate

Expected booked billable days
240.0
Revenue from booked work
£144,000
Inside cash-equivalent permanent salary
£132,758
Outside cash-equivalent permanent salary
£139,027
Hypothetical annualised revenue (renewal required)
£156,000
Hypothetical annualised inside cash (renewal required)
£84,028
Hypothetical annualised outside cash (renewal required)
£85,738
Hypothetical annualised cash-equivalent salary (inside)
£143,764
Hypothetical annualised cash-equivalent salary (outside)
£147,167

Inside IR35: booked income

£78,497 annual cash

£0 pension

£78,497 cash + pension

Show calculation

Assignment / PAYE rate revenue: £144,000
Day rate × billable days; rate type determines whether employer costs are included.

Umbrella margin: £0
Explicit annual fee. No silent default.

Other employer costs: £0
Deducted before solving worker gross pay.

Employer NI: -£18,130
Assignment rate includes this cost; gross PAYE rate excludes it.

Employer pension: £0
Percentage of gross pay, deducted from assignment budget.

Apprenticeship levy: £0
0.5% of pay when umbrella levy applies.

Gross employment cash: £125,870
Salary + bonus + cash car allowance.

Salary sacrifice: £0
Reduces taxable pay and NI pay; added to employer pension.

Employee pension: £0
Net-pay arrangement: reduces income tax, not NI. Percentage of base salary.

Personal allowance: £0
£12,570 reduced £1 for every £2 of adjusted net income above £100,000.

Income tax at 20 %: £7,540
£37,700.00 × 20 %

Income tax at 40 %: £34,976
£87,440.00 × 40 %

Income tax at 45 %: £328
£729.57 × 45 %

Incremental personal tax: -£42,844
Total personal tax with this job less tax on other income alone.

Employee NI: -£4,528
Annual category A estimate: 8% between £12,570 and £50,270; 2% above.

Student loan: £0
Annualised repayments attributable to this job.

Net cash: £78,497
Annual spendable cash from this scenario; excludes other income.

Employer pension: £0
Employer contribution plus salary sacrifice.

Employer NI including Class 1A: £18,130
Employer cost, not deducted from your salary.

Benefits value: £0
Gross non-cash value, separately labelled.

Other deductions: £0
After-tax deductions.

Gross holiday pay accrued: £0
12.07% of base pay, included in total annual gross earnings. Net payment timing depends on payroll; annual cash assumes all accrual is eventually paid.

Outside IR35: booked income

£81,647 annual cash

£0 pension

£81,647 cash + pension

Show calculation

Company revenue: £144,000
Contract revenue + other company revenue; excludes VAT.

Allowable expenses: -£3,000
Assumes all entered costs qualify for Corporation Tax deduction.

Director salary: £0
Evaluated salary; paid from company funds.

Employer NI: £0
15% above £5,000 less eligible Employment Allowance.

Company pension: £0
Assumed qualifying employer contribution deductible before Corporation Tax.

Taxable company profit: £141,000
Revenue less expenses, salary, employer NI and pension.

Corporation Tax: -£33,615
19% / 25% with marginal relief; thresholds divided by 1 + associated companies. Assumes 12-month period and no exempt distributions.

Post-tax distributable profit: £107,385
No brought-forward losses or reserves assumed.

Dividends withdrawn: £107,385
Limited to current distributable profit.

Retained company profit: £0
Company reserves, not personal take-home.

Personal allowance: £8,878
£12,570 reduced £1 for every £2 of adjusted net income above £100,000.

Dividend tax at 10.75 %: £3,999
£37,200.00 taxable dividends × 10.75 %

Dividend tax at 35.75 %: £21,739
£60,807.50 taxable dividends × 35.75 %

Incremental income tax: £0
Includes any allowance taper affecting other income.

Incremental dividend tax: -£25,738
Total dividend tax less baseline tax on other dividends.

Employee NI: £0
Annual director category A NI.

Student loan: £0
Self Assessment estimate including unearned income above £2,000.

Take-home cash: £81,647
Salary + dividends − incremental personal tax − employee NI − student loan.

Planning estimate, not advice. Monetary examples use England, no other income or loans. No automatic levy, umbrella fee or pension charge is assumed. Outside IR35 uses £3,000 annual expenses; company tax assumes a full accounting year.

Worked example: £600/day

220 billable days give £132,000 revenue. These figures use the same engine as your comparison.

Inside IR35

£74,423 annual cash

£121,848 cash-equivalent salary

Outside IR35

£78,666 annual cash

£133,093 cash-equivalent salary

Make it yours

England, no loans or other income. Inside: assignment rate, no margin, levy or pension. Outside: £3,000 expenses, Personal Allowance salary, no pension or retained profit. Salary comparison: 5% employee and employer pension.

Compare with your salary

How this calculation works

Estimate booked weekdays from duration and work pattern, then apply the gap cap and unpaid days. Tax the resulting income assuming no other contracts in the year.

Important assumptions

Months use 52/12 weeks. This is a planning estimate, not an exact dated calendar. Gaps do not create extra booked work.

Frequently asked questions

Is revenue the same as take-home?

No. Employment costs, expenses and taxes can apply before money reaches you. Pension and retained profit are separate.

Can this decide IR35 status?

ContractorMoney.co.uk does not determine IR35 employment status. We model financial consequences after you select a status.

Sources and review

Tax year 2026/27 · Last verified · Methodology · Official sources

ContractorMoney.co.uk does not determine IR35 employment status. Use HMRC's official status guidance. Estimates only, not tax, financial, legal, accounting or investment advice. Read the limitations.

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