摘要:Energy pricing did not only have an implication on the indigent but on the
national government as well. Petroleum subsidy tolerance impacts the government revenue
of certainty but the extent of its impact needs to be determined. Therefore, it becomes
imperative to assess the contribution of the petroleum subsidy on tax volatility. Data were
sourced from the NNPC Annual Statistical Bulletin (ASB) for the year 1997, 2005, 2008
and 2016; Central Bank of Nigeria (CBN) Statistical Bulletin and Statement of Accounts
and Annual Reports. An exploratory analysis was conducted on extracted data to generate
other variables of interest such as subsidy on premium motor spirit, tax revenue volatility
before proceeding to Lease Squares analyses. ARCH and GARCH models were applied to
ascertain the volatility of tax revenue. Petroleum subsidy positively impacts tax revenue
volatility; the impact was minimal but statistically signiÖcant at 1 per cent signiÖcance level.
Exchange rate increased the tax revenue volatility by 5.10 point in the long-run, likewise gross
domestic savings by 0.4 point in the long-run and both estimates were statistically signiÖcant
at 1 per cent respectively. Both government expenditure and gross Öxed capital formation
reduced the tax revenue volatility at 0.05 and 0.03 point respectively and the estimates were
statistically signiÖcant at 10 per cent and 1 per cent. The ECM showed that any deviation
in the estimates would be restored within a year and this is statistically signiÖcant at 1 per
cent. It was therefore recommended that the government should do more to manage and
maintain appropriate exchange rate policy and keep up improving on its expenditure towards
capital formation and investment in order to manage tax revenue volatility.