Bill Introduced to Mandate Disclosure of Revenue Forecast Bases Amid Annual 50 Trillion Won Tax Shortfall

After it was confirmed that government tax revenue forecasts missed actual collections by more than 50 trillion won per year on average over the past four years, a bill has been introduced requiring the government to disclose the basis for its forecasts.

Scale of Revenue Forecasting Errors and the Bill's Background

An audit by the Board of Audit and Inspection found that revenue forecast errors exceeded an average of 50 trillion won annually over the past four years. A revenue forecast error refers to the gap between the government's projected tax revenue and the amount actually collected. As the recent large-scale revenue shortfall, dubbed the '52 trillion won revenue loss' crisis, exposed just how inaccurate the forecasts were, calls for greater transparency in the government's revenue projections have grown.

According to Yonhap News Agency, a bill aimed at reducing revenue forecast errors has been submitted to the National Assembly. Its centerpiece is a requirement that the Ministry of Economy and Finance and other agencies responsible for revenue forecasting disclose in writing the basis for their revenue estimates when drafting the annual budget or a supplementary budget. To date, the government has published economic growth projections and revenue estimates, but the detailed calculation process has remained largely undisclosed.

Key Provisions and Scope of the Bill

If the bill passes, the government would be required to disclose in budget documents the macroeconomic variables used in revenue forecasting, item-by-item estimation methods, and its assumptions and premises. Measures are also under review requiring the submission of analysis materials on the causes when forecasts diverge significantly from actual results. The scope could extend to the Ministry of Economy and Finance's annual revenue and expenditure budget proposals and supplementary budget bills, and possibly even revenue impact estimates made when tax laws are amended.

Fiscal policy experts say mandating disclosure of forecast bases would have effects beyond a mere administrative procedural improvement. Once the estimation process is made public, the National Assembly, audit institutions, and market participants could verify the government's optimistic bias in real time. Indeed, during the recent revenue shortfall crisis, critics charged that the snowballing size of the revenue loss stemmed from the government clinging to overly optimistic outlooks for economic recovery.

Debate Over the Bill and Market Impact

Advocates of the legislation point to securing fiscal soundness. An annual forecasting error of 50 trillion won leads to increased debt and spending cuts, ultimately affecting the public's burden and welfare funding. Critics also argue that maintaining the practice of closed-door estimations, which are difficult for the National Assembly to verify, makes a repeat of such errors inevitable.

There are also concerns among opponents. The government could argue that given the nature of revenue estimation, which involves a tangle of economic variables and tax law changes, full disclosure of the basis would expose tax data estimation techniques and could cause markets to overreact in a particular direction. Still, the prevailing view is that compromise is possible by adjusting the level and scope of disclosure. In the bond market, some interpret that enhanced transparency would help the credibility of government bonds in the long run.

Legislative Process and Outlook

With the National Assembly audit concluded and the legislature moving into legislative and budget review sessions, attention is focusing on how quickly the bill will be handled. Since both ruling and opposition parties share a consensus on securing fiscal transparency, the bill could converge on principled approval despite friction in committee review under the Ministry of Economy and Finance's jurisdiction. However, coordination will be needed on the scope of disclosure and the severity of penalties for non-disclosure.

Even if the bill passes, its effectiveness will depend on implementation. Some argue that follow-up verification functions by the National Assembly Budget Office and the Board of Audit and Inspection must also be strengthened to ensure that the submission of supporting materials does not remain a mere formality. As fiscal spending has grown through presidential and local elections, the accuracy and transparency of revenue estimation is expected to become a key yardstick for the credibility of future budget planning.