The Short Answer
ADP arrears are calculated exactly as PIP arrears are, because the rates are identical. mygov.scot publishes the same four weekly figures GOV.UK publishes for PIP. What differs is everything around the money: a 42-day window to challenge instead of one month, a different tribunal, and Short-term Assistance protecting income while a challenge runs.
The Rates Are the Same
The table below sets out the position, with each figure taken from the source named beneath it.
| Component | Standard | Enhanced |
|---|---|---|
| Daily living | £76.70 | £114.60 |
| Mobility | £30.30 | £80.00 |
Last checked: 6 August 2026
The arithmetic follows: the weekly rate multiplied by the weeks from the date entitlement arose, segmented where the period crosses an April so each part is priced at the rate then in force.
What Differs
The table below sets out the position, with each figure taken from the source named beneath it.
| PIP | ADP | |
|---|---|---|
| Challenge stage 1 | Mandatory reconsideration, 1 month | Re-determination, 42 calendar days |
| Challenge stage 2 | First-tier Tribunal (SSCS), 1 month | First-tier Tribunal for Scotland, 31 calendar days |
| Income protection during a challenge | None | Short-term Assistance |
| Face-to-face element | Assessment by a contracted provider | Consultation by a Social Security Scotland practitioner, only if needed |
Last checked: 7 August 2026
Short-term Assistance Changes the Arithmetic
It tops a reduced or stopped award back up to its previous level while the challenge runs. mygov.scot describes it as designed "to protect people from a sudden drop in household income while they challenge this decision".
That matters for the back pay in a way that has no PIP parallel: money already received as Short-term Assistance is part of the picture when a successful challenge is put into payment. The back-pay calculation still runs from the date entitlement arose; what changes is how much was already paid across that period.
The Missed-Deadline Right
If Social Security Scotland miss their re-determination deadline, you can appeal without waiting. mygov.scot states that "if Social Security Scotland miss their deadline to make a decision on your re-determination, you have the right to make an appeal to the First-tier Tribunal against the original determination without waiting". It has no equivalent in the PIP system, where a slow reconsideration simply delays everything behind it.
Transfers From PIP
A transfer does not restart entitlement. Where back pay is owed on a PIP award for a period before the transfer, it remains owed on the PIP rules for that period, and the ADP award covers the period after.
The pre-transfer period is still segmented by benefit year. Enhanced daily living paid £110.40 a week in 2025/26 and £114.60 in 2026/27, so a window straddling April is priced in two parts on the PIP side before the ADP side begins.
Last checked: 6 August 2026
Contacting Social Security Scotland
0800 182 2222, 8am to 5pm Monday to Friday. Social Security Scotland takes re-determination and appeal requests on that line, and a paper form is available.
Last checked: 7 August 2026
The Full Picture
ADP prices arrears identically to PIP and handles almost everything else differently. One difference sits outside the challenge route altogether: mygov.scot states that "if you're terminally ill you'll automatically get the enhanced daily living award", with no assessment stage in front of it.
Last checked: 7 August 2026
What ADP is, how the process differs and what the consultation involves are on Adult Disability Payment (ADP). To price a PIP period rather than an ADP one, use the PIP back pay calculator.