Economic history of Nigeria
Colonialism is a major feature of the economic history of Nigeria. Britain eventually gained control of Nigerian administration. After independence, the Nigerian economy seemed very promising. Many saw Nigeria, with 25% of Africa's population, as an emerging economy. However, this potential never materialized. A series of unfortunate political and economic events have stalled Nigerian growth. The country still plays an important economic role in the world, especially as a producer of fossil fuels.
Nigeria during the Atlantic slave trade
Direct trade with Europe started from the fifteenth century. Portuguese had explored the coasts to avoid Saharan intermediaries in the trade of West African gold to Europe and that was a way to India. They built coastal bases and introduced the Atlantic slave trade when they bought captives from the kingdom of Benin (nowadays Nigeria) and sold them to African tradesmen on the coast (nowadays Ghana).
The period from 1680-1800 was dominated by a boom of the Atlantic slave trade because of the growth of the Atlantic plantation system. The effects on peaceful production and trade were terrible since slave trade was a cause of conflicts. However, the Atlantic trade still brought advantages. Especially, the currencies that West African tradesmen adopted were more efficient than earlier commodity currencies. This helped to reduce the cost of doing business. 
History of tax in Nigeria
The European struggle to establish communities and trading posts on the West African coast from about the mid-17th century to the mid-18th century was part of the wider competition for trade and empire in the Atlantic. The British, like other newcomers to the slave trade, found they could compete with the Dutch in West Africa only by forming national trading companies. The first such effective English enterprise was the Company of the Royal Adventurers, chartered in 1660 and succeeded in 1672 by the Royal African Company. Only a monopoly company could afford to build and maintain the forts considered essential to hold stocks of slaves and trade goods. In the early 18th century, Britain and France repired the Dutch hold on West African trade; and by the end of the French Revolution and the subsequent Napoleonic Wars (1799–1815), Britain had become the dominant commercial power in West Africa.
The slave trade was one of the major causes of the devastating internecine strife in southern Nigeria during the three centuries to the mid-19th century, when abolition occurred. In the 19th century, Britain was interested primarily in opening markets for its manufactured goods in West Africa and expanding commerce in palm oil. Securing the oil and ivory trade required that Britain usurp the power of coastal chiefs in what became Nigeria.
That was an unplanned consequence of the creation of the Sokoto Caliphate in 1804. At its peak, the Sokoto Caliphate was the most populous state in Africa. The Caliphate occupied most of north-central and north-west Nigeria, as well as parts of neighboring countries of nowadays Nigeria. Internal peace and market integration was a basis of the commercial prosperity of the Caliphate. Hausa merchant diasporas ran an extensive export-trade network and the state had regular increase of the labour supply through the importation of “pagan” captives as slaves. Many cities became bigger, especially, its commercial capital Kano, which was the biggest manufacturing center in the region. The clothing was exported from Kano to all over West Africa. The formation of the Sokoto Caliphate made Islam a mass rural religion for the first time in the region. The Caliphate introduced Islamic taxes that facilitated economic expansion. 
Formal "protection" and—eventually—colonization of Nigeria resulted not only from the desire to safeguard Britain's expanding trade interests in the Nigerian hinterland, but also from an interest in forestalling formal claims by other colonial powers, such as France and Germany. By 1850 British trading interests were concentrating in Lagos and the Niger River delta. British administration in Nigeria formally began in 1861, when Lagos became a crown colony, a step taken in response to factors such as the now-illegal activities of slave traders, the disruption of trade by the Yoruba civil wars, and fears that the French would take over Lagos. Through a series of steps designed to facilitate trade, by 1906 present-day Niger was under British control.
National Economic Interests in the Postwar Period
Starting in 1949, when Nigerian's recently emergent labor, commercial, and professional elites were first consulted by the British as part of a constitutional review, the peoples of Nigeria engaged in ongoing debate over the pressure of decolonization, independence, and modernization. The two coup d'états of 1966 and the civil war of 1967-70 reflected economic as well as political elements.
Between 1951 and 1960, the major political parties played leading roles in unifying and locally mobilizing the economic elite. Elites from majority parties in the regional assemblies who cooperated with the ruling federal coalition dispensed a wide range of rewards and sanctions, thus retaining their own positions and power and keeping the masses subordinated. Positions in government services and public corporations, licenses for market stalls, permits for agricultural export production, rights to establish enterprises, roads, electrical service, running water, and the governing group allocated scholarships to its supporters. Each major party was backed by a bank, which assisted in the transfer of substantial public funds to the party.
At all levels—local and regional after 1951 and federal after 1954—political leaders could use a range of controls, extending over local councils, district administration, police, and courts, to subdue any dissident minority, especially in the far north, where clientage was the social adhesive of the emirate system. Political superiors offered protection, patronage, and economic security in exchange for loyalty and the obedience of inferiors.
The elites attracted clients and socially inferior groups not only in the far north, where Islam legitimized the traditional hierarchy, but even in Igboland, an area of southeastern Nigeria where power had been widely dispersed before the 20th century. The elites of the three regions preferred to close ranks to share the fruits of office and to prevent challenges to their positions, but by the time independence was achieved in 1960, policies designed to enhance the security of one regional elite threatened the security of others.
A major feature of Nigeria's economy in the 1980s, as in the 1970s, was its dependence on petroleum, which accounted for 87 percent of export receipts and 77 percent of the federal government's current revenue in 1988. Falling oil output and prices contributed to another noteworthy aspect of the economy in the 1980s—the decline in per capita real gross national product, which persisted until oil prices began to rise in 1990. Indeed, GNP per capita per year decreased 4.8 percent from 1980 to 1987, which led in 1989 to Nigeria's classification by the World Bank as a low-income country (based on 1987 data) for the first time since the annual World Development Report was instituted in 1978. In 1989 the World Bank also declared Nigeria poor enough to be eligible (along with countries such as Bangladesh, Ethiopia, Chad, and Mali) for concessional aid from an affiliate, the International Development Association (IDA).
Another relevant feature of the Nigerian economy was a series of abrupt changes in the government's share of expenditures. As a percentage of gross domestic product, national government expenditures rose from 9 percent in 1962 to 44 percent in 1979, but fell to 17 percent in 1988. In the aftermath of the 1967-70 civil war, Nigeria's government became more centralized. The oil boom of the 1970s provided the tax revenue to strengthen the central government further. Expansion of the government's share of the economy did little to enhance its political and administrative capacity, but did increase incomes and the number of jobs that the governing elites could distribute to their clients.
The economic collapse in the late 1970s and early 1980s contributed to substantial discontent and conflict between ethnic communities and nationalities, adding to the political pressure to expel more than 2 million illegal workers (mostly from Ghana, Niger, Cameroon, and Chad) in early 1983 and May 1985.