UK watchdog to factor sticky inflation

Britain’s fiscal debate widened on June 2 when the Office for Budget Responsibility said it would reflect the stronger-than-expected persistence of inflation after the 2022 energy shock in its next forecasts. The move means the UK’s independent budget watchdog is treating inflation as a forecasting problem for tax, spending and debt interest, not only as a question for the Bank of England’s rate setters. A separate Bank of England staff paper, published in recent days, added a second pressure point by estimating that the central bank’s gilt sales under quantitative tightening have pushed up borrowing costs. Together, the two developments put more focus on how inflation feeds through public finances and the gilt market. ### Why is the budget watchdog changing its assumptions now? The Office for Budget Responsibility said on June 2 that the “unexpectedly strong persistence of inflation” after the 2022 energy price shock would be incorporated when it updates its forecasts later this year. The statement came alongside its 2026 Forecast Evaluation Report, which said the ongoing effects of unexpected shocks, “particularly the 2022 energy shock,” explained a large share of recent forecast errors. (money.usnews.com) The OBR’s role matters because its forecasts are used to judge the outlook for borrowing, debt and the government’s fiscal rules. The watchdog’s publications page says its next full Economic and Fiscal Outlook is scheduled for autumn 2026, while a Fiscal Risks and Sustainability Report is due on July 7. ### What changes when inflation becomes a fiscal issue? The OBR says CPI inflation is built directly into parts of the tax and spending system, including income-tax thresholds where policy is unchanged and statutory payments for most working-age benefits. (money.usnews.com) That means a higher or more persistent inflation path can alter the government’s revenue and spending assumptions even before ministers announce new policy. (obr.uk) The Office for National Statistics said public sector net borrowing in April 2026 was 24.3 billion pounds, 4.9 billion pounds higher than a year earlier and 3.4 billion pounds above the OBR’s forecast. That monthly gap does not by itself prove an inflation effect, but it shows the sensitivity of public finances to forecast misses. ### What did the Bank of England paper say about gilt yields? (obr.uk) A Bank of England staff working paper identified by the central bank on its working-papers site on May 29 analysed how debt issuance affects the UK yield curve and what that implies for quantitative tightening. Bloomberg reported the staff analysis found a “peak effect on yields of around 40 basis points” from QT, the process through which the Bank is shrinking the stock of gilts accumulated under quantitative easing. (ons.gov.uk) The Bank’s own quantitative easing page says QE was designed to lower long-term borrowing costs to support spending and help meet the 2% inflation target. By extension, the reversal of those holdings through QT can matter for the government because gilts sold back into the market increase the amount of duration private investors must absorb. That inference is consistent with the staff paper’s focus on duration risk and supply effects. (bankofengland.co.uk) ### Why does this matter for gilt investors? The Debt Management Office publishes the results of gilt operations and the Bank of England publishes daily UK yield curves, giving investors two official channels to track how government issuance and market pricing interact. When the OBR signals more persistent inflation in its next forecast round and the Bank’s staff quantify an upward QT effect on yields, investors have to weigh both the inflation path and the supply of bonds. (bankofengland.co.uk) A Bank of England speech page citing Joyce and Lengyel’s research said an unanticipated increase in duration supply similar to the Bank’s first annual QT program of 80 billion pounds could raise 10-year yields by about 20 basis points, subject to market conditions. That official citation does not match the Bloomberg-reported peak estimate exactly, but it points in the same direction: QT effects depend on the scale of supply and the state of the market. (dmo.gov.uk) ### What comes next in the official timetable? The Office for National Statistics will publish the next monthly public-finance release on June 19, the OBR is due to publish its Welfare Trends Report on June 23 and its Fiscal Risks and Sustainability Report on July 7. The OBR’s next full Economic and Fiscal Outlook is scheduled for autumn 2026, when the revised inflation assumptions are due to appear in its central forecast. (ons.gov.uk) (bankofengland.co.uk)