Scottish tax figures are often used as if they settle an argument: receipts are up, so the budget is healthier; receipts are down, so policy has failed. It is rarely that simple. The Scottish Budget is a funding system, not a cash register.
The block grant still matters most
Scotland has meaningful tax powers, but the largest source of funding for the Scottish Budget remains the block grant from the UK Government. It changes with decisions on comparable spending in England through the Barnett formula. Scotland then keeps devolved tax revenue, while the block grant is adjusted to reflect the fact that the UK Government is no longer receiving those taxes.
For a devolved tax such as Scottish Income Tax, the Block Grant Adjustment is an estimate of what the UK Government would have raised from the comparable tax in England and Northern Ireland. It is part of the fiscal framework that prevents the same tax base from being counted twice.
Net performance is the useful question
The key question is therefore not simply whether Scottish receipts have risen. The more useful question is how they have performed relative to the comparable tax base used for the adjustment. Scottish Income Tax can increase in cash terms while the block-grant adjustment increases by more. In that case, the net budget position weakens even though the receipts headline sounds positive.
The reverse can also be true. Scotland benefits if its devolved tax receipts grow more strongly than the relevant comparator, after the fiscal framework’s population adjustment. It should discourage easy claims that a rate change automatically delivers a penny-for-penny gain.
Forecasts eventually become reconciliations
The Budget has to be set before all of the final numbers are known. The Scottish Fiscal Commission forecasts devolved tax revenues and social-security spending; the Office for Budget Responsibility forecasts the comparable tax and spending used for block-grant adjustments. Later, outturn data replaces those forecasts through a reconciliation.
The 2024–25 Income Tax reconciliation illustrates why this matters. The jointly agreed calculation for the 2027–28 Budget was a £720 million reduction in funding: £209 million from lower-than-forecast Scottish Income Tax revenue and £512 million from a higher-than-forecast block-grant adjustment, with rounding in the total. That is not a simple story about a £720 million fall in tax receipts. It is a reminder that both sides of the calculation affect the result.
Social security follows the same logic in reverse
For devolved social-security benefits, the block-grant adjustment adds funding because the UK Government is no longer making those payments. It is based on what the UK would have spent on the comparable benefit. If Scotland chooses to spend more than that amount, or creates a payment without a UK equivalent, the additional cost must be met from elsewhere in the Scottish Budget.
Borrowing buys time, not a blank cheque
The Scotland Reserve and resource-borrowing powers can help manage timing differences and forecast error. But they are capped, and borrowing has to be repaid from future budgets. They cannot substitute for a sustainable revenue base or make an ongoing pressure disappear.
A better fiscal debate would ask a more demanding set of questions: how did Scottish receipts perform relative to the comparator? What happened to the block-grant adjustment? What has changed in social-security spending and service pressures? And what is being assumed in the forecasts? Those questions are less dramatic than a single headline, but they are closer to how the budget actually works.