[Editorial] Fiscal reservoirs

A tax windfall can be dangerous precisely when it looks permanent. South Korea is enjoying one of those moments.

Fueled by a semiconductor upswing and stronger equity markets, national tax revenue this year is expected to exceed the original budget estimate by more than 75 trillion won ($55.3 billion), reaching more than 465 trillion won.

That bonanza could swell next year’s Future Response Fund from its planned 162.3 trillion won to more than 200 trillion won.

With the national budget set at 820.9 trillion won, the fund could command resources equivalent to more than a quarter of annual government spending.

The government calls it a reservoir for strategic investment and fiscal stabilization. At that scale, however, its spending rules matter as much as its purpose.

The case for saving part of a cyclical windfall is straightforward. The nation needs sustained investment in artificial intelligence, advanced semiconductors and other technologies whose returns may take years to emerge. A fund can also cushion public finances when tax revenue falls.

The problem begins when a growth reserve becomes a convenient place to park ordinary spending.

The proposed allocation already blurs that boundary. Of 131 pure spending projects in the initial plan, 125 were retained at their requested levels or increased, while only six were cut.

Among them are the 2.93 trillion won basic child allowance, 3.5 trillion won in local growth grants and 1.17 trillion won for rural basic income. These may be legitimate policies, but recurring commitments require recurring revenue.

A semiconductor boom will not provide that guarantee. Corporate tax receipts can weaken quickly when chip prices, profits or investment cycles turn. Once a benefit becomes embedded in the budget, however, withdrawing it is far harder.

Temporary revenue can create permanent obligations, leaving future taxpayers to fill the gap through higher taxes or additional borrowing.

That is particularly costly in a higher-rate world. Korea’s government interest payments have risen from about 17 trillion won in 2020 to roughly 30 trillion won this year. Refinancing debt issued when borrowing costs were unusually low will keep pushing that bill upward.

Every won used to retire debt eliminates future interest payments, making debt reduction a certain fiscal return at a time when government borrowing costs are high.

The fund’s flexibility also deserves closer scrutiny. Proposed rules would allow major spending items to be adjusted by up to 30 percent without prior parliamentary review. Local subsidy projects could carry funds forward for as long as three years. The entire balance could also be transferred to general accounts when tax revenue falls short.

Such provisions may improve administrative agility, but they also make the fund resemble a parallel budget.

The National Assembly should review the fund as closely as the regular budget, particularly its project selection, spending changes and transfers to general accounts.

Parliamentary scrutiny need not come at the expense of flexibility. Technology investment often requires decisions that cannot wait for a lengthy budget cycle. But flexibility should come with gates.

Withdrawals should meet clearly defined statutory conditions, executive reallocation should face a tighter ceiling and spending changes should be disclosed promptly. Projects that fail agreed performance tests should face automatic clawbacks.

Most importantly, surplus revenue should have a predetermined claim for debt reduction before money flows into an expansive fund.

The fund itself should concentrate on nonrecurring investments with measurable long-term effects, while continuing welfare programs remain in the regular budget and compete openly for scarce resources.

The country has been handed an unusual fiscal cushion by an unusually favorable industrial cycle. The sensible response is to preserve its value.

A reservoir is useful because it holds water for when the weather changes. It becomes less useful when its size encourages everyone to start drawing from it.