Nigeria's development efforts since independence have accentuated poverty and inequality reduction through economic growth, employment creation, and financial sector development. Although the basic commitment to tackling poverty remains high, these efforts have not always yielded expected results. About 40% of Nigerians remain mired in poverty, with women and rural households most affected. One poverty alleviation intervention that has received significant interest in the research and policy space is access to finance, as not having access to basic financial services is considered as one of the biggest barriers to poverty and inequality alleviation, as well as other measures of economic prosperity. Although prolific literature has developed on the role of finance for poverty alleviation, controversies continue to plague the literature on the microeconomic links between access to finance and a range of measures of economic prosperity. In addition, a number of policy-relevant issues have remained significantly under-researched. For instance, although the literature conclusively suggests that access to finance has positive implications for poverty alleviation in developing countries, less conclusive evidence is available on the role of access to finance on inter-household inequality and occupational choices. Furthermore, due to data limitations, little policy-relevant knowledge has accumulated in specific contexts, such as that of Nigeria. Till date, no rigorous analysis has explored the role of financial sector development on inequality and entrepreneurship, despite the importance of its linkages for both sustainable growth and social stability in Nigeria. To address the academic and policy gap in the literature this thesis consists of three independent but closely linked studies investigating the implication of access to formal finance for household welfare in Nigeria using the GHS-Panel sub-section of the Nigeria's Living Standard Measurement Study (LSMS) surveys for 2010-2011 and 2012-2013. The first study examines the effects of access to formal finance on welfare and inter-household inequality, measured by the disparity in per capita household expenditures. We employ a treatment effects model to decompose the links between access to finance, proxied by owning an account with a formal financial institution, and household per capita expenditures. Thereafter, the study uses an innovative decomposition methodology, based on the treatment effects model, to explore the distributional effect of access to finance on households' per capita expenditures in Nigeria. The methodology allows for the computation of the relative contribution of different explanatory variables to the inter-household disparity in living standards. While there is a prolific research on the effect of access to finance on poverty, the implications for inequality at the micro level remain under-studied. Our results indicate that although access to formal finance improves household welfare, it tends to increase inter-household inequalities, despite ameliorating the inequality-enhancing effect of urban versus rural residence and enhancing the inequality ameliorating the effect of greater educational attainment. We also find that the contribution of access to formal finance on inter-household inequality is substantially smaller than the effect of unobserved household characteristics, suggesting that welfare and inequality-enhancing strategies in Nigeria should be holistic, as opposed to addressing one policy variable at a time. For years, the conventional paradigm in poverty analysis ignored the dynamic nature of household welfare. This conventional paradigm assumes that household poverty is static, thereby overlooking the fact that households inevitably move in and out of poverty over time. In a departure from the conventional welfare analysis paradigm, this second paper builds on the first paper and explores the role of access to formal finance in household welfare dynamics in Nigeria, drawing on two waves of household panel data sets covering 2010-2011 and 2012-2013. Consistent with the contemporary approach to poverty analysis, the study relies on two complementary empirical approaches, which have been widely used in poverty dynamics analyses - a multinomial logit model and a bivariate probit model. While a multinomial logit model, which is our baseline model, treats the factors associated with the household's initial conditions as exogenous, a bivariate probit model treats the factors associated with the household's initial conditions as endogenous, instead of taking them as given, which is argued in the literature may introduce selection bias into our specification. Our results indicate that contrary to expectations, given the country's growth and financial sector development performance, poverty incidence is increasing in Nigeria, as the share of Nigerians living in poverty increased between 2010-2011 and 2012-2013. Access to formal financial services is found to reduce the likelihood of consistently poor households remaining in poverty and consistently non-poor households slipping into poverty. The study also found that access to finance and its improvement reduces transient poverty in Nigeria. Finally, the third paper explores the implication of access to finance for household head's entrepreneurial choices and household enterprise growth. The study goes beyond the conventional use of self-employment as a measure of entrepreneurship, by disaggregating entrepreneurship choices into part-time entrepreneurship and full-time entrepreneurship. It then examines the role of access to finance on entering these two occupational statuses after accounting for the potential endogeneity of access to finance. The results indicate that these two categories of entrepreneurs are conceptually very different, especially with respect to their access to and potential use of formal finance for entrepreneurship purpose, which has potentially interesting policy implications. The study also investigates the role of access to external credit in household enterprise growth, once again after correcting for the endogeneity of the access to credit variable. We find that formal finance does not conclusively improve post-entry enterprise growth in Nigeria and other factors, mostly related to enterprise performance and potentially to social norms, are more important for enterprise growth.