Fiscal vs monetary policy

When an economy slows down or inflation takes off, governments and central banks have two broad sets of levers to pull. Fiscal policy works through taxes and public spending; monetary policy works through interest rates and the money supply. They share the aim of steering the economy, but they are wielded by different institutions, for somewhat different purposes, and on different time horizons. Understanding the distinction is fundamental to making sense of economic debate in the UK and beyond.

Two different toolkits

Fiscal policy is the use of government spending and taxation to influence the economy. By adjusting how much it taxes and spends, the government changes the level of demand, and with it growth, employment and inflation. In the UK, fiscal policy is set by the elected government, primarily through HM Treasury and the Chancellor of the Exchequer. Big decisions are announced in set-piece events such as the Budget and require parliamentary approval. Because it decides who is taxed and what is funded, fiscal policy is inherently political.

Monetary policy is the management of interest rates and the money supply, chiefly to keep inflation under control. In the UK it is set by the Bank of England, whose Monetary Policy Committee (MPC) adjusts the official interest rate (the “Bank Rate”) and, when needed, deploys other tools. Crucially, the Bank has been operationally independent since 1997, charged with meeting an inflation target set by the government — currently 2% CPI.

Why the Bank is independent

The split is deliberate. Delegating interest rates to an independent central bank is meant to insulate monetary decisions from short-term political pressure — for instance, the temptation to cut rates just before an election to boost the economy artificially. Handing the job to experts with a clear, public target is intended to make policy more credible and to anchor inflation expectations, which itself helps keep inflation stable over the long run.

Fiscal policy answers to voters through Parliament; monetary policy is delegated to independent experts with a fixed target.

How they steer the economy

Both policies work mainly by shifting aggregate demand — the total spending in the economy — though they pull different levers.

On the fiscal side, expansionary policy boosts demand by cutting taxes, raising government spending, or both. It is typically used in a downturn to support growth and jobs, but it tends to widen the budget deficit and may add to government borrowing. Contractionary fiscal policy does the reverse — raising taxes or cutting spending — to cool an overheating economy or shrink a deficit, at the risk of slowing growth in the short run.

On the monetary side, the main lever is the interest rate. Lowering rates makes borrowing cheaper and saving less rewarding, encouraging households and firms to spend and invest, which raises demand. Raising rates does the opposite, dampening demand to bring inflation down. These effects work with a lag and through many channels, so timing is difficult.

When interest rates are already very low, the Bank can turn to quantitative easing (QE) — creating money to buy financial assets, mainly government bonds, to push down longer-term rates and support the economy. QE expands the money supply and the central bank’s balance sheet, and was used heavily after the 2008 financial crisis and during the pandemic.

Deficits and debt

Fiscal policy is closely tied to two terms that are often confused. A budget deficit is the gap in a single year when government spending exceeds its revenue. The national debt is the accumulated stock of all past borrowing. Persistent deficits add to the debt over time, while a surplus — revenue above spending — can reduce it. How much a government should borrow, and how quickly any deficit should be closed, is one of the central and most contested questions in economic policy.

When they pull in different directions

Because fiscal and monetary policy are set by separate bodies with different aims and time horizons, they can sometimes work against each other. A government might run expansionary fiscal policy to support growth at the same time as the central bank is raising rates to fight inflation, with each partly offsetting the other. There is genuine debate among economists about how the two should be coordinated, how effective each is in different circumstances, and where the limits of borrowing or money creation lie. These are matters of ongoing disagreement rather than settled fact, and reasonable economists differ on them.

What is clear is the basic division of labour: the government taxes and spends, while the independent Bank of England sets interest rates and manages the money supply. Keeping these two toolkits — and the institutions behind them — distinct is the starting point for almost any serious discussion of how a modern economy is managed.