Comparison · Salary & Tax · 2026
Overtime vs Second Job Take-Home UK 2026: Which Keeps More of Your Pay?
Need to earn extra? You can either work overtime at your current job or take on a second job. The income tax bill is broadly the same over a full year, but National Insurance and tax codes can tip the balance. This guide compares the two using 2026/27 rates, with a worked example and clear guidance on which keeps more in your pocket.
TL;DR -- 30-Second Summary
- • Income tax: broadly identical over the year -- HMRC reconciles total income
- • National Insurance: each job has its own GBP 12,570 threshold and 8% band to GBP 50,270
- • Low-paid second job: can escape some 8% employee NI that overtime would pay
- • Higher earners: overtime keeps NI at 2%; a second job restarts NI at 8%
- • Watch: the BR tax code on a second job can over-deduct -- check your codes
Side-by-Side Comparison
| Feature | Overtime (main job) | Second job |
|---|---|---|
| Income tax rate | 20% / 40% by band | Usually BR 20% (or D0 40%) |
| Personal Allowance | Already applied here | None unless code is split |
| NI threshold | Shared with normal pay | Separate GBP 12,570 threshold |
| Employee NI rate | 8% to GBP 50,270, then 2% | 8% above its own GBP 12,570 |
| Admin | One payslip, one code | Two payslips, two codes to check |
| Flexibility | Depends on employer offering hours | Independent of main employer |
How Overtime Is Taxed
Overtime is just extra pay in your main job, so it follows the normal 2026/27 rules. The first GBP 12,570 of total income is covered by the Personal Allowance, the next slice to GBP 50,270 is taxed at 20% income tax with 8% employee National Insurance, and earnings above GBP 50,270 are taxed at 40% income tax with NI falling to 2%.
Because your allowance and lower bands are already used by your basic salary, overtime is taxed at your marginal rate. For a basic-rate worker that is 20% tax plus 8% NI, leaving 72p of every extra pound. For a higher-rate worker it is 40% tax plus 2% NI, leaving 58p.
How a Second Job Is Taxed
A second job is a separate PAYE employment. Because your Personal Allowance is normally attached to your main job, the second job typically gets a BR code, taxing all its pay at 20% (or D0 at 40% if your main job already uses the higher-rate band). The income tax result over the year matches what you would pay on the same total income from one job.
National Insurance is where a difference can arise. NI is calculated separately for each employment, and each has its own GBP 12,570 annual threshold (about GBP 242 a week). A small second job paying under that threshold pays no employee NI at all, even though your main job has already used its own threshold.
Worked Example: GBP 6,000 of Extra Earnings
Take a basic-rate worker earning GBP 30,000 in their main job who wants to earn GBP 6,000 more, either as overtime or from a separate part-time second job paying GBP 6,000 a year.
| Item | GBP 6,000 overtime | GBP 6,000 second job |
|---|---|---|
| Income tax (20%) | GBP 1,200 | GBP 1,200 (BR code) |
| Employee NI | GBP 480 (8%, above threshold) | GBP 0 (under its own GBP 12,570) |
| Total deductions | GBP 1,680 | GBP 1,200 |
| Take-home from the extra GBP 6,000 | GBP 4,320 | GBP 4,800 |
In this case the second job keeps GBP 480 more, purely because its earnings sit below their own GBP 12,570 NI threshold and so avoid the 8% employee National Insurance that overtime on the main job would pay. The income tax is identical at GBP 1,200. If the second job paid well over GBP 12,570 a year, the NI advantage would shrink and the two options would converge.
When Overtime Wins and When a Second Job Wins
A second job tends to win when the extra work is modest and stays below the GBP 12,570 NI threshold in that job, because part of the pay escapes employee National Insurance. It can also win on flexibility, since it does not depend on your main employer offering hours.
Overtime tends to win for higher earners already above GBP 50,270, whose main-job NI has dropped to 2% -- a second job would restart NI at 8% on its lower band. Overtime is also simpler: one payslip, one tax code, and no risk of a BR code over-deducting and waiting on an HMRC refund. Whichever you choose, check your tax codes through your Personal Tax Account so you are not over- or under-taxed.