A Principal Software Engineer earning the median salary of £148K in the UK takes home approximately £90,226/year (£7,519/month) after Income Tax and National Insurance, using 2026/27 rates.
The table above uses the Principal Software Engineer median. Enter your own gross salary below for a precise figure.
2026/27 tax year
Personal Allowance: £12,570. Basic rate (20%) up to £50,270. Higher rate (40%) up to £125,140. Additional rate (45%) above.
Common salaries:
Annual take-home pay
£90,226
Per month
£7,519
Per week
£1,735
Effective tax rate
39.0%
Personal Allowance
£0
How your £148,000 is split
£90,226
61.0%
£52,803
35.7%
£4,971
3.4%
| Gross salary | £148,000 |
| Personal Allowance (tax-free) | £0 |
| Income Tax | -£52,803 |
| National Insurance (Class 1) | -£4,971 |
| Total deductions | -£57,774 |
| Net take-home (annual) | £90,226 |
Calculations use 2026/27 UK tax rates. Assumes England/Wales/Northern Ireland Income Tax rates (Scottish rates differ). Includes standard Personal Allowance tapering above £100,000, and applies any pension salary sacrifice entered above before calculating tax. Does not account for Gift Aid, student loan repayments, Marriage Allowance, or other reliefs. For precise advice consult a tax professional or HMRC.
Permanent median
£148,000
£90,226 take-home
Contract median
£863/day
≈ £189,860 gross a year
At a median £863/day, contract work grosses about £189,860 a year over 220 billable days, 28% more than the £148,000 permanent median. That premium has to pay for what an employer would otherwise cover: paid holiday and sick days, pension contributions, and the gaps between contracts. Whether a contract falls inside or outside IR35 also changes how much of it you keep.
Contract and permanent benchmarks come from separate samples, so treat the gap as a guide rather than a like-for-like quote. See Principal Software Engineer contract rates and contractor take-home →
A Principal Software Engineer earning the median salary of £148K in the UK takes home approximately £90,226 per year (£7,519 per month) after Income Tax and National Insurance, using 2026/27 HMRC rates.
On a median Principal Software Engineer salary of £148K, the effective tax rate (Income Tax and NI combined) is 39.0%, leaving £90,226 as take-home pay. This assumes standard Personal Allowance and England/Wales Income Tax rates.
On a £148K salary, a Principal Software Engineer pays approximately £52,803 in Income Tax per year. This uses the 2026/27 Personal Allowance of £12,570, a basic rate of 20% up to £50,270, and 40% above.
On a £148K salary, employee Class 1 National Insurance amounts to approximately £4,971 per year. The 2026/27 rates are 8% on earnings between £12,570 and £50,270, and 2% above.
The standard Personal Allowance for 2026/27 is £12,570, which is tax-free. For salaries above £100,000, the allowance tapers by £1 for every £2 earned, disappearing entirely at £125,140. At £148K, this tapering fully eliminates the Personal Allowance.
At a median £863/day, contract work grosses about £189,860 a year over 220 billable days, 28% more than the £148,000 permanent median. That premium has to pay for what an employer would otherwise cover: paid holiday and sick days, pension contributions, and the gaps between contracts. Whether a contract falls inside or outside IR35 also changes how much of it you keep. Contract and permanent benchmarks come from separate samples, so treat the gap as a guide.
Principal Software Engineer Salary Benchmarks
Full range, city comparisons, seniority bands
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Principal Software Engineer contractor rates
Compare permanent pay with current contract market rates
Remote vs Hybrid
Is the commute worth it?
Principal Software Engineer Salary in Scotland
Take-home under Scottish income tax (19%–48%)