SD2 applies Scotland's advanced rate of 45% to all income from this source — used for second jobs or pensions when the main income already falls in the advanced rate band.
Forty-five per cent on every pound. The SD2 tax code applies Scotland's advanced rate to all income from this source, with no Personal Allowance. It is one of the rarest Scottish tax codes, appearing only for high earners whose total income from all sources exceeds £75,000 and places the second income in Scotland's advanced rate band. This rate band is unique to Scotland and does not exist in the rest of the UK.
SD2 is composed of two parts. The S prefix identifies you as a Scottish taxpayer, confirming you live in Scotland and your income tax follows Scottish rates. The D2 tells your employer to apply a flat rate with no Personal Allowance.
Scotland's D-series codes map to its unique six-band rate structure:
The advanced rate of 45% applies to taxable income between £75,001 and £125,140 in 2025/26. This rate band is entirely unique to Scotland. In the rest of the UK, income in this range is still taxed at the higher rate of 40%. This means a Scottish taxpayer paying SD2 at 45% is paying 5% more on this income than an English taxpayer in the equivalent position, who would still be on D0 at 40%.
Why Scotland has an advanced rate band. The Scottish Parliament introduced the advanced rate to create a more progressive tax structure for higher earners. It sits between the higher rate (42%, on income from £43,663 to £75,000) and the top rate (48%, on income above £125,140). England has no equivalent. The English higher rate of 40% applies from £50,271 all the way to £125,140, with no intermediate step at 45%.
The confusing overlap with England's additional rate. England's additional rate is also 45%, but it applies above £125,140. Scotland's advanced rate of 45% applies from £75,001 to £125,140. So while the percentage is the same, the income range is entirely different. Scottish taxpayers hit 45% at a much lower income threshold.
This is the comparison that matters most for SD2 holders. In the rest of the UK, income between £75,001 and £125,140 is taxed at the higher rate of 40% (D0). In Scotland, it is taxed at the advanced rate of 45% (SD2). The difference is stark.
| Feature | SD2 (Scotland) | D0 (England, at this income level) |
|---|---|---|
| Tax rate | 45% | 40% |
| Personal Allowance | None | None |
| Income range | £75,001 to £125,140 | £50,271 to £125,140 |
| Tax on £10,000 | £4,500 | £4,000 |
| Tax on £25,000 | £11,250 | £10,000 |
| Difference | £500 more per £10,000 | -- |
On a second income of £25,000 that falls in this band, a Scottish taxpayer on SD2 pays £1,250 more per year than an English taxpayer on D0. That is over £100 per month in additional tax, purely because of the Scottish advanced rate.
If SD2 were incorrectly applied to your only income source, the overpayment would be extreme. Here is the comparison:
| Annual income from source | Tax on SD2 (45% flat) | Tax on S1257L (Scottish bands) | Annual difference |
|---|---|---|---|
| £10,000 | £4,500 | £0 | £4,500 overpaid |
| £30,000 | £13,500 | £3,538 | £9,962 overpaid |
| £50,000 | £22,500 | £9,029 | £13,471 overpaid |
At 45% flat with no allowance, an incorrect SD2 on a £50,000 salary means over £13,000 per year in overpaid tax. That is more than £1,100 per month taken unnecessarily. This scenario would only arise from a significant HMRC error, but it illustrates why checking your code matters.
SD2 is one of the rarest tax codes in the UK. It applies to a narrow group of high-earning Scottish taxpayers with secondary income sources.
Second job for a high-earning Scottish professional. Your main job pays £85,000 on an S1257L code. You earn £20,000 from a non-executive directorship. Since your main income has exhausted all bands up to and through the higher rate (£75,000), the directorship income falls in the advanced rate band. HMRC assigns SD2.
Second pension for a high-income Scottish retiree. If your combined pension income exceeds £75,000 (plus the Personal Allowance), the pension source carrying income in the advanced band may receive SD2.
Senior professionals with consultancy income. Partners, consultants, and senior managers in Scotland who earn above £75,000 from their main role and take on additional paid work may see SD2 on the secondary income.
Why SD2 is rare. The advanced rate band covers income from £75,001 to £125,140, which is a £50,000 range. However, SD2 only applies to secondary income sources where the primary income has already pushed total income above £75,000. The number of people who both earn above £75,000 from a main job and have a second taxable income source is relatively small. Most high earners in this bracket receive their income from a single source (employment or self-employment), making SD2 applicable to a niche group.
Fiona lives in Edinburgh and earns £90,000 from her role as a finance director. She also earns £18,000 from a non-executive board appointment. Her main job carries S1257L and the board role carries SD2.
Main job (S1257L):
| Component | Amount |
|---|---|
| Gross salary | £90,000 |
| Personal Allowance | £12,570 (tax-free) |
| Starter rate (19%) | £2,827 x 19% = £537.13 |
| Basic rate (20%) | £12,093 x 20% = £2,418.60 |
| Intermediate rate (21%) | £16,171 x 21% = £3,395.91 |
| Higher rate (42%) | £31,339 x 42% = £13,162.38 |
| Advanced rate (45%) | £15,000 x 45% = £6,750.00 |
| Total tax on main | £26,264.02 |
Board role (SD2):
| Component | Amount |
|---|---|
| Gross board fees | £18,000 |
| Personal Allowance | £0 |
| Tax at 45% (all of it) | £18,000 x 45% = £8,100 |
Combined position:
| Item | Amount |
|---|---|
| Total gross income | £108,000 |
| Total income tax | £34,364.02 |
| Monthly take-home (tax only) | £6,136 approx |
Fiona's SD2 is correct. Her main income of £90,000 exhausts all bands up to and into the advanced rate. Her additional £18,000 from board fees falls squarely within the advanced rate band (total income of £108,000 is between £75,001 and £125,140 on the second source portion). If her total income exceeded £125,140, the top rate of 48% would apply to the excess.
Note on Personal Allowance tapering: At £108,000 total income, Fiona's Personal Allowance has already begun to taper (it reduces by £1 for every £2 above £100,000). Her actual allowance would be £12,570 - ((£108,000 - £100,000) / 2) = £8,570. HMRC adjusts her main job code accordingly, reducing the number from 1257 to approximately 857. The worked example above uses the full £12,570 for clarity, but in practice, her main job code would be lower and the tax on the main job would be higher.
SD2 is correct if:
SD2 is probably wrong if:
Given the high rate of 45%, an incorrect SD2 code is expensive to leave uncorrected.
Step 1: Review your HMRC Personal Tax Account. Log in at gov.uk/personal-tax-account and check the income estimates HMRC holds for each source. If they are overestimating your main income (perhaps based on a previous year's bonus or overtime that will not recur), your second source code may be set too high.
Step 2: Call HMRC. Phone the Income Tax helpline on 0300 200 3300 (Monday to Friday, 8am to 6pm). At this income level, coding involves multiple bands and potentially the Personal Allowance taper, so speaking to an adviser directly is often more effective than relying on the online system. Have your National Insurance number, all PAYE references, and actual income projections ready.
Step 3: Request a formal review. If HMRC's initial response does not resolve the issue, request a formal review of your coding. They must provide a written explanation of how your code was calculated, including which income figure they used and how the bands were allocated.
Step 4: Monitor the correction. Once the code changes, your employer applies it cumulatively from 6 April. At 45%, even one month of incorrect coding produces a significant overpayment. On £18,000 of annual income (£1,500/month), SD2 takes £675 per month in tax. If the correct code were SD1 (42%), the monthly tax would be £630, saving £45 per month. If the code should be SBR (20%), the saving is £375 per month.
Related tax codes: Scottish tax codes overview | SD1 tax code | D1 tax code
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