Decentralising power sounds brilliant in a speech. Giving local leaders the keys to the financial vault feels like a direct strike against London-centric governance. But when it comes to handing fresh tax-raising authorities to metro mayors across England, pressing fast-forward without robust safeguards is an administrative disaster waiting to happen.
The ambitious devolution agenda pushed by Prime Minister Andy Burnham aims to break the long-standing Treasury grip on regional spending. Plans dictate that regional authorities will retain shares of locally raised income tax and business rates. The narrative is simple: let regions keep what they generate, and watch local growth explode.
Yet, economic analysts and tax policy experts are pumping the brakes for good reason. Shifting fiscal levers down to local leaders without fixing underlying structural flaws creates massive risks. If you move too fast, you risk widening regional divides, triggering administrative chaos, and leaving taxpayers footing the bill for local mismanagement.
The Revenue Disparity Trap
The core flaw in rushing tax devolution is that wealth isn't distributed evenly across English postcodes. A tax-retention model assumes every region possesses a thriving commercial base capable of sustaining public services through local yields alone.
Take a hard look at the map. Affluent areas with booming corporate hubs, major financial services, and dense commercial real estate will rake in massive surpluses. Meanwhile, post-industrial towns, rural communities, and economically deprived regions will face a chronically depressed tax base.
Without a sophisticated, ironclad redistribution mechanism, poorer areas will experience severe funding squeezes. You cannot run functional public infrastructure, transport networks, and social care on a local tax intake that shrinks every time a major employer relocates down the line. Whitehall grants historically buffered these inequalities. Stripping them away too quickly leaves vulnerable councils exposed to economic shocks.
Administrative Nightmares and Accountability Gaps
Tax collection is brutally complex. Accurately tracking where income taxpayers actually live—rather than where their corporate headquarters claim they work—poses a massive technical challenge for local authorities that have spent decades operating as administrative delivery arms rather than independent tax collectors.
Then comes the accountability problem. Mayoral transparency has historically been a weak link in English governance. Voter turnout in local mayoral elections often hovers around disappointing margins, and regional scrutiny committees frequently lack the resources or teeth to challenge executive decisions properly.
When a local council spends central grant money poorly, voters know who to blame. When a mayor introduces novel local levies, or mismanages a retained revenue pool, tracking responsibility through a maze of combined authorities and fragmented local government tiers gets messy. If mayors gain the power to tax without facing an upgraded, hyper-vigilant local audit system, financial oversight crumbles.
The Temptation of Volatility
Grant funding is predictable. Local tax yields are notoriously volatile.
During economic downturns, retail revenue drops, commercial vacancies spike, and income tax receipts slide. If metro mayors rely heavily on retained business rates and regional income tax shares, their annual budgets will swing wildly based on macroeconomic trends outside their control.
While proposed safety nets aim to catch areas where revenues drop below baseline thresholds, relying on bailout mechanisms defeats the primary argument for fiscal autonomy. If a regional leader has to run to Whitehall every time a recession hits local retail parks, true independence is an illusion. Furthermore, the temptation for some populist mayors to offer eye-catching local tax rebates to win votes—rather than investing in long-term capital projects—creates a race to the bottom in fiscal responsibility.
What Needs to Happen First
Fixing regional inequality requires patience and institutional scaffolding, not a sudden midnight dash to rewrite the nation's tax code.
Before handing over major fiscal levers, policymakers must ensure that local scrutiny structures match those of national government. Every combined authority needs an empowered, independent local audit office capable of blocking reckless borrowing or opaque spending.
At the same time, central government must design a permanent, friction-free equalization formula that protects historically disadvantaged regions from falling behind. Devolution should empower local leadership, but it shouldn't punish citizens just because they live in a lower-yield postcode. Take the time to build the machinery right, or expect a messy rescue operation down the road.
