The Short Answer
A mandatory reconsideration that changes your award pays arrears back to the date the original decision took effect. The new decision replaces the old one from that date, so every week in between is repriced and the difference arrives as one lump sum. Payment normally follows within days, because the decision and the payment instruction come from the same DWP system. The amount depends on the gap between the two decisions, not on how long the reconsideration took.
What Back Pay a Mandatory Reconsideration Produces
The new decision replaces the original from the original's effective date, and the difference for every week since is owed. At the 2026/27 enhanced daily living rate of £114.60 a week, 30 weeks of back pay is £3,438. That principle produces three different amounts depending on what the original decision said.
| What the original decision did | What the reconsideration changes | What is owed |
|---|---|---|
| Refused a new claim | Awards PIP instead | Every week from the claim date at the awarded rate |
| Awarded the standard rate | Awards the enhanced rate | The difference between the rates for every week since |
| Awarded one component | Awards both | The added component for every week since |
| Reduced or stopped an award on review | Restores the award | The difference from the date the reduction took effect |
Last checked: 7 August 2026
The pattern is the same in all four rows: the money runs from the effective date of the decision under challenge, not from the date of the reconsideration. Waiting weeks are never lost weeks, which is the point pip back pay explained makes across every trigger.
How Far Back It Reaches
To the effective date of the decision being reconsidered, and no further. For a refused new claim that is normally the date of the claim itself. The DWP recorded a median end-to-end clearance time of 20 weeks for new claims at January 2026, so a reconsideration of a refused claim commonly reaches back six months or more.
For a decision made at a planned review, it is the date the changed award took effect. For a decision made after a reported change of circumstances, it is the date the change applied. In each case the reconsideration is repairing one decision, so it reaches back to where that decision started rather than to the beginning of the claim.
When the Money Arrives
Normally within days of the new decision. A reconsideration is decided by a DWP decision maker, and the payment instruction issues from the same system, so nothing travels between organisations. Many claimants see the bank credit before the mandatory reconsideration notice arrives in the post.
That is the practical difference from a tribunal outcome, where Citizens Advice puts the normal wait at 4 to 6 weeks because the decision has to return from the courts service to the DWP before payment can be recalculated.
Last checked: 7 August 2026
How Often Reconsiderations Change the Award
27% of mandatory reconsiderations cleared in the quarter ending January 2026 changed the award, excluding withdrawn ones. Across the longer run of initial decisions made between October 2020 and September 2025, 17% of completed reconsiderations resulted in a change.
Last checked: 7 August 2026
Those figures describe outcomes, not odds for any individual case, and the difference between them is worth reading carefully. The quarterly figure is higher than the long-run one, and both are published by the DWP in its quarterly PIP statistics. What decides a particular reconsideration is the evidence it carries that the original decision did not have.
What Changes the Outcome
New evidence addressed to specific descriptors is what moves a reconsideration. A request that repeats the original claim without adding anything asks the same decision maker to reach a different conclusion from the same papers, which is why the 27% figure above belongs to requests that carry something new.
The elements that work are narrow and checkable: a named activity, the descriptor you say applies, what happens when you attempt the task, and the document that supports it. The process itself, including deadlines and what the notice contains, is set out on the PIP Mandatory Reconsideration page.
Where the reconsideration does not change the decision, the next step is an appeal to the tribunal, and the back-pay principle carries through unchanged: a tribunal that increases the award pays back to the same effective date.
Work Out Your Number
The amount depends on the gap between the two decisions and the award finally made. Put your dates and the award into the pip back pay calculator to see what a successful reconsideration should produce for your own case.