Tax Code S0T W1 Explained

What does S0T W1 mean?

S0T marks you as a Scottish taxpayer for the 2026/27 year. The personal-allowance logic is identical to the rUK version of 0T - the number still represents your tax-free amount, the letter still describes any allowance adjustment - but Holyrood (not Westminster) sets the rates above the allowance. The 2026/27 Scottish bands are: 19% starter rate on the first slice above your allowance, 20% basic rate, 21% intermediate rate, 42% higher rate, 45% advanced rate and 48% top rate above £125,140. HMRC determines residency from your main home, not your employer's location, so a Scotland-based employee at a London-headquartered firm will still be issued an S code. National Insurance is unaffected and continues to use UK-wide thresholds. S0T applies no personal allowance at all, but unlike SBR it still steps you through the full Scottish band ladder: 19% starter rate on the first slice above your allowance, 20% basic rate, 21% intermediate rate, 42% higher rate, 45% advanced rate and 48% top rate. Every pound is taxable from the first payslip. S0T is usually an emergency code — a new starter with no P45 who did not complete a starter checklist, or a final payment made after a P45 was issued — and it is also used for non-resident directors, redundancy above the £30,000 exempt limit, and some share-scheme payouts. It is almost always temporary: once HMRC reconciles your year-to-date pay it will issue a cumulative code and refund the overpayment through your next payslip. The W1 suffix changes how the code is applied. Instead of recalculating against year-to-date earnings every payday (the normal cumulative method), payroll treats each pay period as a fresh start. You receive 1/52nd (W1), 1/12th (M1) or one slice (X) of your tax-free allowance and basic-rate band each period, and any unused allowance from earlier in the year is ignored. That stops a refund being issued before HMRC has confirmed your figures, but it can leave you slightly overpaid until a cumulative code is reissued. W1 codes are almost always temporary holding codes that resolve within one or two pay cycles after your first FPS submission reaches HMRC.

How W1, M1 and X emergency codes work

Breakdown of the code

• S

  S

  Scottish prefix - you live in Scotland and pay Scottish income-tax rates (19% / 20% / 21% / 42% / 45% / 48%).

• 0

  Number

  Zero personal allowance.

• T

  Letter

  Items in your tax affairs require HMRC review - used here to mark a temporary zero-allowance state.

• W1

  W1

  Non-cumulative weekly basis. Each pay period is treated independently - no smoothing across the year.

Worked example

Scottish new starter who could not supply a P45 on £30,000 (paid monthly).

£507.56 a month in income tax (~£6,091/year) - roughly £2,640/year more than S1257L, because the whole £12,570 allowance has been withdrawn.

Who should be on S0T W1?

• New starters who could not provide a P45 and completed a starter checklist
• Employees whose previous employer reported their leaver pay late
• People returning to PAYE after self-employment or working overseas
• Cases where HMRC has paused a cumulative calculation pending a record review

Common problems

• Bonuses and one-off payments are taxed harder than under a cumulative code because unused allowance from earlier months is ignored.
• The code persists for three or more months - usually a sign HMRC has not received the FPS submission needed to reconcile your record.
• You have switched jobs and your former employer issued the P45 late, so the W1/M1/X code stays in place longer than it should.

What to do if S0T W1 looks wrong

1. Provide your employer with a P45 from your previous job, or complete a starter checklist accurately (Statement A, B or C).
2. Wait one or two pay cycles - most emergency codes auto-correct as soon as HMRC receives the first FPS submission from your new employer.
3. If the code persists into a third payslip, sign in to your personal tax account and confirm both employments are listed correctly.
4. Phone HMRC on 0300 200 3300 quoting the date you started and the date your last job ended - they can issue a cumulative P9 the same day.
5. Once a cumulative code is reissued, any overpaid tax is refunded automatically through your next payslip.